blob: 5796f1127799be886226bc37c84cf31d74cba5f4 [file] [log] [blame]
Eric Andersen25f27032001-04-26 23:22:31 +00001/* vi: set sw=4 ts=4: */
2/*
3 * sh.c -- a prototype Bourne shell grammar parser
4 * Intended to follow the original Thompson and Ritchie
5 * "small and simple is beautiful" philosophy, which
6 * incidentally is a good match to today's BusyBox.
7 *
8 * Copyright (C) 2000,2001 Larry Doolittle <larry@doolittle.boa.org>
9 *
10 * Credits:
11 * The parser routines proper are all original material, first
Eric Andersencb81e642003-07-14 21:21:08 +000012 * written Dec 2000 and Jan 2001 by Larry Doolittle. The
13 * execution engine, the builtins, and much of the underlying
14 * support has been adapted from busybox-0.49pre's lash, which is
Eric Andersenc7bda1c2004-03-15 08:29:22 +000015 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
Eric Andersencb81e642003-07-14 21:21:08 +000016 * written by Erik Andersen <andersen@codepoet.org>. That, in turn,
17 * is based in part on ladsh.c, by Michael K. Johnson and Erik W.
18 * Troan, which they placed in the public domain. I don't know
19 * how much of the Johnson/Troan code has survived the repeated
20 * rewrites.
21 *
Eric Andersen25f27032001-04-26 23:22:31 +000022 * Other credits:
Eric Andersen25f27032001-04-26 23:22:31 +000023 * b_addchr() derived from similar w_addchar function in glibc-2.2
24 * setup_redirect(), redirect_opt_num(), and big chunks of main()
Denis Vlasenko55b2de72007-04-18 17:21:28 +000025 * and many builtins derived from contributions by Erik Andersen
Eric Andersen25f27032001-04-26 23:22:31 +000026 * miscellaneous bugfixes from Matt Kraai
27 *
28 * There are two big (and related) architecture differences between
29 * this parser and the lash parser. One is that this version is
30 * actually designed from the ground up to understand nearly all
31 * of the Bourne grammar. The second, consequential change is that
32 * the parser and input reader have been turned inside out. Now,
33 * the parser is in control, and asks for input as needed. The old
34 * way had the input reader in control, and it asked for parsing to
35 * take place as needed. The new way makes it much easier to properly
36 * handle the recursion implicit in the various substitutions, especially
37 * across continuation lines.
38 *
39 * Bash grammar not implemented: (how many of these were in original sh?)
Eric Andersen25f27032001-04-26 23:22:31 +000040 * $_
41 * ! negation operator for pipes
42 * &> and >& redirection of stdout+stderr
43 * Brace Expansion
44 * Tilde Expansion
45 * fancy forms of Parameter Expansion
Eric Andersen78a7c992001-05-15 16:30:25 +000046 * aliases
Eric Andersen25f27032001-04-26 23:22:31 +000047 * Arithmetic Expansion
48 * <(list) and >(list) Process Substitution
Eric Andersen83a2ae22001-05-07 17:59:25 +000049 * reserved words: case, esac, select, function
Eric Andersen25f27032001-04-26 23:22:31 +000050 * Here Documents ( << word )
51 * Functions
52 * Major bugs:
Denis Vlasenkob81b3df2007-04-28 16:48:04 +000053 * job handling woefully incomplete and buggy (improved --vda)
Eric Andersen25f27032001-04-26 23:22:31 +000054 * reserved word execution woefully incomplete and buggy
Eric Andersen25f27032001-04-26 23:22:31 +000055 * to-do:
Eric Andersen83a2ae22001-05-07 17:59:25 +000056 * port selected bugfixes from post-0.49 busybox lash - done?
57 * finish implementing reserved words: for, while, until, do, done
58 * change { and } from special chars to reserved words
59 * builtins: break, continue, eval, return, set, trap, ulimit
60 * test magic exec
Eric Andersen25f27032001-04-26 23:22:31 +000061 * handle children going into background
62 * clean up recognition of null pipes
Eric Andersen25f27032001-04-26 23:22:31 +000063 * check setting of global_argc and global_argv
64 * control-C handling, probably with longjmp
Eric Andersen25f27032001-04-26 23:22:31 +000065 * follow IFS rules more precisely, including update semantics
Eric Andersen25f27032001-04-26 23:22:31 +000066 * figure out what to do with backslash-newline
67 * explain why we use signal instead of sigaction
68 * propagate syntax errors, die on resource errors?
69 * continuation lines, both explicit and implicit - done?
70 * memory leak finding and plugging - done?
71 * more testing, especially quoting rules and redirection
Eric Andersen78a7c992001-05-15 16:30:25 +000072 * document how quoting rules not precisely followed for variable assignments
Denis Vlasenko8f6bdb42007-05-16 09:36:55 +000073 * maybe change charmap[] to use 2-bit entries
Eric Andersen25f27032001-04-26 23:22:31 +000074 * (eventually) remove all the printf's
Eric Andersen25f27032001-04-26 23:22:31 +000075 *
Bernhard Reutner-Fischer86f5c992006-01-22 22:55:11 +000076 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
Eric Andersen25f27032001-04-26 23:22:31 +000077 */
Bernhard Reutner-Fischere15d7572006-06-02 20:56:16 +000078
Denis Vlasenkob6adbf12007-05-26 19:00:18 +000079
Eric Andersen25f27032001-04-26 23:22:31 +000080#include <glob.h> /* glob, of course */
Eric Andersen25f27032001-04-26 23:22:31 +000081#include <getopt.h> /* should be pretty obvious */
Eric Andersen25f27032001-04-26 23:22:31 +000082/* #include <dmalloc.h> */
Denis Vlasenkob6adbf12007-05-26 19:00:18 +000083
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +000084extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */
Denis Vlasenkod01ff132007-05-02 21:40:23 +000085
Denis Vlasenkob6adbf12007-05-26 19:00:18 +000086#include "busybox.h" /* for struct bb_applet */
87
Denis Vlasenkod01ff132007-05-02 21:40:23 +000088
89/* If you comment out one of these below, it will be #defined later
90 * to perform debug printfs to stderr: */
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +000091#define debug_printf(...) do {} while (0)
Denis Vlasenko400c5b62007-05-04 13:07:27 +000092/* Finer-grained debug switches */
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +000093#define debug_printf_parse(...) do {} while (0)
94#define debug_print_tree(a, b) do {} while (0)
95#define debug_printf_exec(...) do {} while (0)
96#define debug_printf_jobs(...) do {} while (0)
97#define debug_printf_expand(...) do {} while (0)
98#define debug_printf_clean(...) do {} while (0)
Denis Vlasenkod01ff132007-05-02 21:40:23 +000099
100#ifndef debug_printf
101#define debug_printf(...) fprintf(stderr, __VA_ARGS__)
Denis Vlasenkod01ff132007-05-02 21:40:23 +0000102#endif
Denis Vlasenkod01ff132007-05-02 21:40:23 +0000103
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +0000104#ifndef debug_printf_parse
105#define debug_printf_parse(...) fprintf(stderr, __VA_ARGS__)
Denis Vlasenkod01ff132007-05-02 21:40:23 +0000106#endif
107
108#ifndef debug_printf_exec
109#define debug_printf_exec(...) fprintf(stderr, __VA_ARGS__)
110#endif
111
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +0000112#ifndef debug_printf_jobs
113#define debug_printf_jobs(...) fprintf(stderr, __VA_ARGS__)
114#define DEBUG_SHELL_JOBS 1
115#endif
116
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +0000117#ifndef debug_printf_expand
118#define debug_printf_expand(...) fprintf(stderr, __VA_ARGS__)
119#define DEBUG_EXPAND 1
120#endif
121
Denis Vlasenko170435c2007-05-23 13:01:10 +0000122/* Keep unconditionally on for now */
123#define ENABLE_HUSH_DEBUG 1
124
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +0000125#ifndef debug_printf_clean
126/* broken, of course, but OK for testing */
127static const char *indenter(int i)
128{
Denis Vlasenko6ca409e2007-08-12 20:58:27 +0000129 static const char blanks[] ALIGN1 =
130 " ";
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +0000131 return &blanks[sizeof(blanks) - i - 1];
132}
133#define debug_printf_clean(...) fprintf(stderr, __VA_ARGS__)
Denis Vlasenkoc666f712007-05-16 22:18:54 +0000134#define DEBUG_CLEAN 1
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +0000135#endif
136
Eric Andersen25f27032001-04-26 23:22:31 +0000137
Denis Vlasenkob81b3df2007-04-28 16:48:04 +0000138#if !ENABLE_HUSH_INTERACTIVE
139#undef ENABLE_FEATURE_EDITING
140#define ENABLE_FEATURE_EDITING 0
141#undef ENABLE_FEATURE_EDITING_FANCY_PROMPT
142#define ENABLE_FEATURE_EDITING_FANCY_PROMPT 0
143#endif
"Robert P. J. Day"f3501602006-07-01 12:19:39 +0000144
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +0000145#define SPECIAL_VAR_SYMBOL 3
Denis Vlasenko219e88d2007-05-21 10:18:23 +0000146
147#define PARSEFLAG_EXIT_FROM_LOOP 1
148#define PARSEFLAG_SEMICOLON (1 << 1) /* symbol ';' is special for parser */
149#define PARSEFLAG_REPARSING (1 << 2) /* >= 2nd pass */
Eric Andersen25f27032001-04-26 23:22:31 +0000150
151typedef enum {
152 REDIRECT_INPUT = 1,
153 REDIRECT_OVERWRITE = 2,
154 REDIRECT_APPEND = 3,
155 REDIRECT_HEREIS = 4,
156 REDIRECT_IO = 5
157} redir_type;
158
159/* The descrip member of this structure is only used to make debugging
160 * output pretty */
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +0000161static const struct {
162 int mode;
Denis Vlasenkoef36ead2007-05-02 15:34:47 +0000163 signed char default_fd;
164 char descrip[3];
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +0000165} redir_table[] = {
Eric Andersen25f27032001-04-26 23:22:31 +0000166 { 0, 0, "()" },
167 { O_RDONLY, 0, "<" },
168 { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" },
169 { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" },
170 { O_RDONLY, -1, "<<" },
171 { O_RDWR, 1, "<>" }
172};
173
174typedef enum {
175 PIPE_SEQ = 1,
176 PIPE_AND = 2,
177 PIPE_OR = 3,
178 PIPE_BG = 4,
179} pipe_style;
180
181/* might eventually control execution */
182typedef enum {
183 RES_NONE = 0,
Denis Vlasenko06810332007-05-21 23:30:54 +0000184#if ENABLE_HUSH_IF
Eric Andersen25f27032001-04-26 23:22:31 +0000185 RES_IF = 1,
186 RES_THEN = 2,
187 RES_ELIF = 3,
188 RES_ELSE = 4,
189 RES_FI = 5,
Denis Vlasenko06810332007-05-21 23:30:54 +0000190#endif
191#if ENABLE_HUSH_LOOPS
Eric Andersen25f27032001-04-26 23:22:31 +0000192 RES_FOR = 6,
193 RES_WHILE = 7,
194 RES_UNTIL = 8,
195 RES_DO = 9,
196 RES_DONE = 10,
Denis Vlasenko06810332007-05-21 23:30:54 +0000197 RES_IN = 11,
198#endif
199 RES_XXXX = 12,
Eric Andersen4c9b68f2002-04-13 12:33:41 +0000200 RES_SNTX = 13
Eric Andersen25f27032001-04-26 23:22:31 +0000201} reserved_style;
Denis Vlasenko5f786c22007-04-20 08:35:45 +0000202enum {
203 FLAG_END = (1 << RES_NONE ),
Denis Vlasenko06810332007-05-21 23:30:54 +0000204#if ENABLE_HUSH_IF
Denis Vlasenko5f786c22007-04-20 08:35:45 +0000205 FLAG_IF = (1 << RES_IF ),
206 FLAG_THEN = (1 << RES_THEN ),
207 FLAG_ELIF = (1 << RES_ELIF ),
208 FLAG_ELSE = (1 << RES_ELSE ),
209 FLAG_FI = (1 << RES_FI ),
Denis Vlasenko06810332007-05-21 23:30:54 +0000210#endif
211#if ENABLE_HUSH_LOOPS
Denis Vlasenko5f786c22007-04-20 08:35:45 +0000212 FLAG_FOR = (1 << RES_FOR ),
213 FLAG_WHILE = (1 << RES_WHILE),
214 FLAG_UNTIL = (1 << RES_UNTIL),
215 FLAG_DO = (1 << RES_DO ),
216 FLAG_DONE = (1 << RES_DONE ),
217 FLAG_IN = (1 << RES_IN ),
Denis Vlasenko06810332007-05-21 23:30:54 +0000218#endif
Denis Vlasenko5f786c22007-04-20 08:35:45 +0000219 FLAG_START = (1 << RES_XXXX ),
220};
Eric Andersen25f27032001-04-26 23:22:31 +0000221
222/* This holds pointers to the various results of parsing */
223struct p_context {
224 struct child_prog *child;
225 struct pipe *list_head;
226 struct pipe *pipe;
227 struct redir_struct *pending_redirect;
Denis Vlasenko219e88d2007-05-21 10:18:23 +0000228 smallint res_w;
229 smallint parse_type; /* bitmask of PARSEFLAG_xxx, defines type of parser : ";$" common or special symbol */
230 int old_flag; /* bitmask of FLAG_xxx, for figuring out valid reserved words */
Eric Andersen25f27032001-04-26 23:22:31 +0000231 struct p_context *stack;
232 /* How about quoting status? */
233};
234
235struct redir_struct {
Denis Vlasenkob81b3df2007-04-28 16:48:04 +0000236 struct redir_struct *next; /* pointer to the next redirect in the list */
Denis Vlasenko0c886c62007-01-30 22:30:09 +0000237 redir_type type; /* type of redirection */
238 int fd; /* file descriptor being redirected */
239 int dup; /* -1, or file descriptor being duplicated */
Denis Vlasenko0c886c62007-01-30 22:30:09 +0000240 glob_t word; /* *word.gl_pathv is the filename */
Eric Andersen25f27032001-04-26 23:22:31 +0000241};
242
243struct child_prog {
Denis Vlasenko0c886c62007-01-30 22:30:09 +0000244 pid_t pid; /* 0 if exited */
245 char **argv; /* program name and arguments */
246 struct pipe *group; /* if non-NULL, first in group or subshell */
Denis Vlasenko262d7652007-05-20 21:52:49 +0000247 smallint subshell; /* flag, non-zero if group must be forked */
248 smallint is_stopped; /* is the program currently running? */
Denis Vlasenko0c886c62007-01-30 22:30:09 +0000249 struct redir_struct *redirects; /* I/O redirections */
250 glob_t glob_result; /* result of parameter globbing */
Denis Vlasenko0c886c62007-01-30 22:30:09 +0000251 struct pipe *family; /* pointer back to the child's parent pipe */
Denis Vlasenkoc666f712007-05-16 22:18:54 +0000252 //sp counting seems to be broken... so commented out, grep for '//sp:'
253 //sp: int sp; /* number of SPECIAL_VAR_SYMBOL */
Denis Vlasenko262d7652007-05-20 21:52:49 +0000254 //seems to be unused, grep for '//pt:'
255 //pt: int parse_type;
Eric Andersen25f27032001-04-26 23:22:31 +0000256};
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +0000257/* argv vector may contain variable references (^Cvar^C, ^C0^C etc)
258 * and on execution these are substituted with their values.
259 * Substitution can make _several_ words out of one argv[n]!
260 * Example: argv[0]=='.^C*^C.' here: echo .$*.
261 */
Eric Andersen25f27032001-04-26 23:22:31 +0000262
263struct pipe {
Denis Vlasenkob81b3df2007-04-28 16:48:04 +0000264 struct pipe *next;
Denis Vlasenko0c886c62007-01-30 22:30:09 +0000265 int num_progs; /* total number of programs in job */
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +0000266 int running_progs; /* number of programs running (not exited) */
Denis Vlasenko219e88d2007-05-21 10:18:23 +0000267 int stopped_progs; /* number of programs alive, but stopped */
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +0000268#if ENABLE_HUSH_JOB
Denis Vlasenkob81b3df2007-04-28 16:48:04 +0000269 int jobid; /* job number */
Denis Vlasenko0c886c62007-01-30 22:30:09 +0000270 pid_t pgrp; /* process group ID for the job */
Denis Vlasenko219e88d2007-05-21 10:18:23 +0000271 char *cmdtext; /* name of job */
Denis Vlasenkob81b3df2007-04-28 16:48:04 +0000272#endif
Denis Vlasenko219e88d2007-05-21 10:18:23 +0000273 char *cmdbuf; /* buffer various argv's point into */
Denis Vlasenko0c886c62007-01-30 22:30:09 +0000274 struct child_prog *progs; /* array of commands in pipe */
Denis Vlasenko0c886c62007-01-30 22:30:09 +0000275 int job_context; /* bitmask defining current context */
Denis Vlasenko219e88d2007-05-21 10:18:23 +0000276 smallint followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
277 smallint res_word; /* needed for if, for, while, until... */
Eric Andersen25f27032001-04-26 23:22:31 +0000278};
279
Eric Andersen25f27032001-04-26 23:22:31 +0000280struct close_me {
Eric Andersen25f27032001-04-26 23:22:31 +0000281 struct close_me *next;
Denis Vlasenkob81b3df2007-04-28 16:48:04 +0000282 int fd;
Eric Andersen25f27032001-04-26 23:22:31 +0000283};
284
Denis Vlasenkod76c0492007-05-25 02:16:25 +0000285/* On program start, environ points to initial environment.
286 * putenv adds new pointers into it, unsetenv removes them.
287 * Neither of these (de)allocates the strings.
288 * setenv allocates new strings in malloc space and does putenv,
289 * and thus setenv is unusable (leaky) for shell's purposes */
290#define setenv(...) setenv_is_leaky_dont_use()
291struct variable {
292 struct variable *next;
Denis Vlasenko28c0f0f2007-05-25 02:46:01 +0000293 char *varstr; /* points to "name=" portion */
Denis Vlasenkod76c0492007-05-25 02:16:25 +0000294 int max_len; /* if > 0, name is part of initial env; else name is malloced */
295 smallint flg_export; /* putenv should be done on this var */
Denis Vlasenko219e88d2007-05-21 10:18:23 +0000296 smallint flg_read_only;
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000297};
298
Eric Andersen25f27032001-04-26 23:22:31 +0000299typedef struct {
300 char *data;
301 int length;
302 int maxlen;
303 int quote;
304 int nonnull;
305} o_string;
306#define NULL_O_STRING {NULL,0,0,0,0}
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000307/* used for initialization: o_string foo = NULL_O_STRING; */
Eric Andersen25f27032001-04-26 23:22:31 +0000308
309/* I can almost use ordinary FILE *. Is open_memstream() universally
310 * available? Where is it documented? */
311struct in_str {
Denis Vlasenko3e9aaae2007-05-11 12:56:43 +0000312 const char *p;
313 /* eof_flag=1: last char in ->p is really an EOF */
314 char eof_flag; /* meaningless if ->p == NULL */
315 char peek_buf[2];
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +0000316#if ENABLE_HUSH_INTERACTIVE
Denis Vlasenko5a1437d2007-05-24 13:22:47 +0000317 smallint promptme;
318 smallint promptmode; /* 0: PS1, 1: PS2 */
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +0000319#endif
Eric Andersen25f27032001-04-26 23:22:31 +0000320 FILE *file;
321 int (*get) (struct in_str *);
322 int (*peek) (struct in_str *);
323};
324#define b_getch(input) ((input)->get(input))
325#define b_peek(input) ((input)->peek(input))
326
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000327enum {
328 CHAR_ORDINARY = 0,
329 CHAR_ORDINARY_IF_QUOTED = 1, /* example: *, # */
330 CHAR_IFS = 2, /* treated as ordinary if quoted */
331 CHAR_SPECIAL = 3, /* example: $ */
Eric Andersen25f27032001-04-26 23:22:31 +0000332};
333
Denis Vlasenkod76c0492007-05-25 02:16:25 +0000334#define HUSH_VER_STR "0.02"
335
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000336/* "Globals" within this file */
337
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000338/* Sorted roughly by size (smaller offsets == smaller code) */
339struct globals {
340#if ENABLE_HUSH_INTERACTIVE
341 /* 'interactive_fd' is a fd# open to ctty, if we have one
342 * _AND_ if we decided to act interactively */
343 int interactive_fd;
344 const char *PS1;
345 const char *PS2;
346#endif
347#if ENABLE_FEATURE_EDITING
348 line_input_t *line_input_state;
349#endif
350#if ENABLE_HUSH_JOB
351 int run_list_level;
352 pid_t saved_task_pgrp;
353 pid_t saved_tty_pgrp;
354 int last_jobid;
355 struct pipe *job_list;
356 struct pipe *toplevel_list;
357 smallint ctrl_z_flag;
358#endif
359 smallint fake_mode;
360 /* these three support $?, $#, and $1 */
361 char **global_argv;
362 int global_argc;
363 int last_return_code;
364 const char *ifs;
365 struct close_me *close_me_head;
366 const char *cwd;
367 unsigned last_bg_pid;
Denis Vlasenko0a83fc32007-05-25 11:12:32 +0000368 struct variable *top_var; /* = &shell_ver (set in main()) */
369 struct variable shell_ver;
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000370#if ENABLE_FEATURE_SH_STANDALONE
371 struct nofork_save_area nofork_save;
372#endif
373#if ENABLE_HUSH_JOB
374 sigjmp_buf toplevel_jb;
375#endif
376 unsigned char charmap[256];
377 char user_input_buf[ENABLE_FEATURE_EDITING ? BUFSIZ : 2];
378};
379
380#define G (*ptr_to_globals)
381
382#if !ENABLE_HUSH_INTERACTIVE
383enum { interactive_fd = 0 };
384#endif
385#if !ENABLE_HUSH_JOB
386enum { run_list_level = 0 };
387#endif
388
389#if ENABLE_HUSH_INTERACTIVE
390#define interactive_fd (G.interactive_fd )
391#define PS1 (G.PS1 )
392#define PS2 (G.PS2 )
393#endif
394#if ENABLE_FEATURE_EDITING
395#define line_input_state (G.line_input_state)
396#endif
397#if ENABLE_HUSH_JOB
398#define run_list_level (G.run_list_level )
399#define saved_task_pgrp (G.saved_task_pgrp )
400#define saved_tty_pgrp (G.saved_tty_pgrp )
401#define last_jobid (G.last_jobid )
402#define job_list (G.job_list )
403#define toplevel_list (G.toplevel_list )
404#define toplevel_jb (G.toplevel_jb )
405#define ctrl_z_flag (G.ctrl_z_flag )
406#endif /* JOB */
407#define global_argv (G.global_argv )
408#define global_argc (G.global_argc )
409#define last_return_code (G.last_return_code)
410#define ifs (G.ifs )
411#define fake_mode (G.fake_mode )
412#define close_me_head (G.close_me_head )
413#define cwd (G.cwd )
414#define last_bg_pid (G.last_bg_pid )
Denis Vlasenkod76c0492007-05-25 02:16:25 +0000415#define top_var (G.top_var )
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000416#define shell_ver (G.shell_ver )
417#if ENABLE_FEATURE_SH_STANDALONE
418#define nofork_save (G.nofork_save )
Denis Vlasenko4b924f32007-05-30 00:29:55 +0000419#endif
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000420#if ENABLE_HUSH_JOB
421#define toplevel_jb (G.toplevel_jb )
422#endif
423#define charmap (G.charmap )
424#define user_input_buf (G.user_input_buf )
425
426
427#define B_CHUNK 100
428#define B_NOSPAC 1
429#define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
430
Denis Vlasenko90e485c2007-05-23 15:22:50 +0000431#if 1
432/* Normal */
433static void syntax(const char *msg)
434{
Denis Vlasenko5a1437d2007-05-24 13:22:47 +0000435 /* Was using fancy stuff:
436 * (interactive_fd ? bb_error_msg : bb_error_msg_and_die)(...params...)
437 * but it SEGVs. ?! Oh well... explicit temp ptr works around that */
438 void (*fp)(const char *s, ...);
439
440 fp = (interactive_fd ? bb_error_msg : bb_error_msg_and_die);
441 fp(msg ? "%s: %s" : "syntax error", "syntax error", msg);
Denis Vlasenko90e485c2007-05-23 15:22:50 +0000442}
Denis Vlasenko5a1437d2007-05-24 13:22:47 +0000443
Denis Vlasenko90e485c2007-05-23 15:22:50 +0000444#else
445/* Debug */
446static void syntax_lineno(int line)
Denis Vlasenkob6aae0f2007-01-29 22:51:25 +0000447{
Denis Vlasenko5a1437d2007-05-24 13:22:47 +0000448 void (*fp)(const char *s, ...);
449
450 fp = (interactive_fd ? bb_error_msg : bb_error_msg_and_die);
451 fp("syntax error hush.c:%d", line);
Eric Andersen25f27032001-04-26 23:22:31 +0000452}
Denis Vlasenko90e485c2007-05-23 15:22:50 +0000453#define syntax(str) syntax_lineno(__LINE__)
454#endif
Eric Andersen25f27032001-04-26 23:22:31 +0000455
456/* Index of subroutines: */
457/* function prototypes for builtins */
Denis Vlasenko1359da62007-04-21 23:27:30 +0000458static int builtin_cd(char **argv);
Denis Vlasenko1359da62007-04-21 23:27:30 +0000459static int builtin_eval(char **argv);
460static int builtin_exec(char **argv);
461static int builtin_exit(char **argv);
462static int builtin_export(char **argv);
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +0000463#if ENABLE_HUSH_JOB
Denis Vlasenko1359da62007-04-21 23:27:30 +0000464static int builtin_fg_bg(char **argv);
Denis Vlasenko1359da62007-04-21 23:27:30 +0000465static int builtin_jobs(char **argv);
Denis Vlasenkob81b3df2007-04-28 16:48:04 +0000466#endif
Denis Vlasenko06810332007-05-21 23:30:54 +0000467#if ENABLE_HUSH_HELP
Denis Vlasenkob81b3df2007-04-28 16:48:04 +0000468static int builtin_help(char **argv);
Denis Vlasenko06810332007-05-21 23:30:54 +0000469#endif
Denis Vlasenko1359da62007-04-21 23:27:30 +0000470static int builtin_pwd(char **argv);
471static int builtin_read(char **argv);
472static int builtin_set(char **argv);
473static int builtin_shift(char **argv);
474static int builtin_source(char **argv);
475static int builtin_umask(char **argv);
476static int builtin_unset(char **argv);
Denis Vlasenko06810332007-05-21 23:30:54 +0000477//static int builtin_not_written(char **argv);
Eric Andersen25f27032001-04-26 23:22:31 +0000478/* o_string manipulation: */
479static int b_check_space(o_string *o, int len);
480static int b_addchr(o_string *o, int ch);
481static void b_reset(o_string *o);
482static int b_addqchr(o_string *o, int ch, int quote);
Eric Andersen25f27032001-04-26 23:22:31 +0000483/* in_str manipulations: */
484static int static_get(struct in_str *i);
485static int static_peek(struct in_str *i);
486static int file_get(struct in_str *i);
487static int file_peek(struct in_str *i);
488static void setup_file_in_str(struct in_str *i, FILE *f);
489static void setup_string_in_str(struct in_str *i, const char *s);
490/* close_me manipulations: */
491static void mark_open(int fd);
492static void mark_closed(int fd);
Eric Anderseneaecbf32001-10-31 10:41:31 +0000493static void close_all(void);
Eric Andersen25f27032001-04-26 23:22:31 +0000494/* "run" the final data structures: */
Denis Vlasenkoc666f712007-05-16 22:18:54 +0000495#if !defined(DEBUG_CLEAN)
496#define free_pipe_list(head, indent) free_pipe_list(head)
497#define free_pipe(pi, indent) free_pipe(pi)
498#endif
Eric Andersenbf7df042001-05-23 22:18:35 +0000499static int free_pipe_list(struct pipe *head, int indent);
500static int free_pipe(struct pipe *pi, int indent);
Eric Andersen25f27032001-04-26 23:22:31 +0000501/* really run the final data structures: */
502static int setup_redirects(struct child_prog *prog, int squirrel[]);
Eric Andersen25f27032001-04-26 23:22:31 +0000503static int run_list_real(struct pipe *pi);
Denis Vlasenko1359da62007-04-21 23:27:30 +0000504static void pseudo_exec_argv(char **argv) ATTRIBUTE_NORETURN;
Bernhard Reutner-Fischer86f5c992006-01-22 22:55:11 +0000505static void pseudo_exec(struct child_prog *child) ATTRIBUTE_NORETURN;
Eric Andersen25f27032001-04-26 23:22:31 +0000506static int run_pipe_real(struct pipe *pi);
507/* extended glob support: */
508static int globhack(const char *src, int flags, glob_t *pglob);
509static int glob_needed(const char *s);
510static int xglob(o_string *dest, int flags, glob_t *pglob);
Eric Andersen78a7c992001-05-15 16:30:25 +0000511/* variable assignment: */
Eric Andersen78a7c992001-05-15 16:30:25 +0000512static int is_assignment(const char *s);
Eric Andersen25f27032001-04-26 23:22:31 +0000513/* data structure manipulation: */
514static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input);
515static void initialize_context(struct p_context *ctx);
516static int done_word(o_string *dest, struct p_context *ctx);
517static int done_command(struct p_context *ctx);
518static int done_pipe(struct p_context *ctx, pipe_style type);
519/* primary string parsing: */
520static int redirect_dup_num(struct in_str *input);
521static int redirect_opt_num(o_string *o);
Denis Vlasenko14b5dd92007-05-20 21:51:38 +0000522#if ENABLE_HUSH_TICK
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +0000523static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, const char *subst_end);
Denis Vlasenko14b5dd92007-05-20 21:51:38 +0000524#endif
Eric Andersen25f27032001-04-26 23:22:31 +0000525static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch);
Denis Vlasenko15d78fb2007-01-30 22:28:21 +0000526static const char *lookup_param(const char *src);
Eric Andersen25f27032001-04-26 23:22:31 +0000527static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input);
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +0000528static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, const char *end_trigger);
Eric Andersen25f27032001-04-26 23:22:31 +0000529/* setup: */
Denis Vlasenko170435c2007-05-23 13:01:10 +0000530static int parse_and_run_stream(struct in_str *inp, int parse_flag);
531static int parse_and_run_string(const char *s, int parse_flag);
532static int parse_and_run_file(FILE *f);
Eric Andersenbafd94f2001-05-02 16:11:59 +0000533/* job management: */
Eric Andersenc798b072001-06-22 06:23:03 +0000534static int checkjobs(struct pipe* fg_pipe);
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +0000535#if ENABLE_HUSH_JOB
Denis Vlasenko52881e92007-04-21 13:42:52 +0000536static int checkjobs_and_fg_shell(struct pipe* fg_pipe);
Eric Andersenbafd94f2001-05-02 16:11:59 +0000537static void insert_bg_job(struct pipe *pi);
538static void remove_bg_job(struct pipe *pi);
Denis Vlasenko1359da62007-04-21 23:27:30 +0000539static void delete_finished_bg_job(struct pipe *pi);
Denis Vlasenkob81b3df2007-04-28 16:48:04 +0000540#else
541int checkjobs_and_fg_shell(struct pipe* fg_pipe); /* never called */
542#endif
Eric Andersenf72f5622001-05-15 23:21:41 +0000543/* local variable support */
Denis Vlasenko170435c2007-05-23 13:01:10 +0000544static char **expand_strvec_to_strvec(char **argv);
545/* used for eval */
546static char *expand_strvec_to_string(char **argv);
Denis Vlasenkob6a741f2007-05-17 14:38:17 +0000547/* used for expansion of right hand of assignments */
Denis Vlasenko170435c2007-05-23 13:01:10 +0000548static char *expand_string_to_string(const char *str);
Denis Vlasenko28c0f0f2007-05-25 02:46:01 +0000549static struct variable *get_local_var(const char *name);
550static int set_local_var(char *str, int flg_export);
Denis Vlasenko87cb2db2007-04-21 10:00:01 +0000551static void unset_local_var(const char *name);
Eric Andersen25f27032001-04-26 23:22:31 +0000552
553/* Table of built-in functions. They can be forked or not, depending on
554 * context: within pipes, they fork. As simple commands, they do not.
555 * When used in non-forking context, they can change global variables
Denis Vlasenkoe1a0d482006-10-20 13:28:22 +0000556 * in the parent shell process. If forked, of course they cannot.
Eric Andersen25f27032001-04-26 23:22:31 +0000557 * For example, 'unset foo | whatever' will parse and run, but foo will
558 * still be set at the end. */
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000559struct built_in_command {
560 const char *cmd; /* name */
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000561 int (*function) (char **argv); /* function ptr */
Denis Vlasenko06810332007-05-21 23:30:54 +0000562#if ENABLE_HUSH_HELP
563 const char *descr; /* description */
564#define BLTIN(cmd, func, help) { cmd, func, help }
565#else
566#define BLTIN(cmd, func, help) { cmd, func }
567#endif
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000568};
569
"Vladimir N. Oleynik"485d7cb2005-10-17 09:48:57 +0000570static const struct built_in_command bltins[] = {
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +0000571#if ENABLE_HUSH_JOB
Denis Vlasenko06810332007-05-21 23:30:54 +0000572 BLTIN("bg" , builtin_fg_bg, "Resume a job in the background"),
Denis Vlasenkob81b3df2007-04-28 16:48:04 +0000573#endif
Denis Vlasenko06810332007-05-21 23:30:54 +0000574// BLTIN("break" , builtin_not_written, "Exit for, while or until loop"),
575 BLTIN("cd" , builtin_cd, "Change working directory"),
576// BLTIN("continue", builtin_not_written, "Continue for, while or until loop"),
577 BLTIN("eval" , builtin_eval, "Construct and run shell command"),
578 BLTIN("exec" , builtin_exec, "Exec command, replacing this shell with the exec'd process"),
579 BLTIN("exit" , builtin_exit, "Exit from shell"),
580 BLTIN("export", builtin_export, "Set environment variable"),
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +0000581#if ENABLE_HUSH_JOB
Denis Vlasenko06810332007-05-21 23:30:54 +0000582 BLTIN("fg" , builtin_fg_bg, "Bring job into the foreground"),
583 BLTIN("jobs" , builtin_jobs, "Lists the active jobs"),
Denis Vlasenkob81b3df2007-04-28 16:48:04 +0000584#endif
Denis Vlasenko06810332007-05-21 23:30:54 +0000585// TODO: remove pwd? we have it as an applet...
586 BLTIN("pwd" , builtin_pwd, "Print current directory"),
587 BLTIN("read" , builtin_read, "Input environment variable"),
588// BLTIN("return", builtin_not_written, "Return from a function"),
589 BLTIN("set" , builtin_set, "Set/unset shell local variables"),
590 BLTIN("shift" , builtin_shift, "Shift positional parameters"),
591// BLTIN("trap" , builtin_not_written, "Trap signals"),
592// BLTIN("ulimit", builtin_not_written, "Controls resource limits"),
593 BLTIN("umask" , builtin_umask, "Sets file creation mask"),
594 BLTIN("unset" , builtin_unset, "Unset environment variable"),
595 BLTIN("." , builtin_source, "Source-in and run commands in a file"),
596#if ENABLE_HUSH_HELP
597 BLTIN("help" , builtin_help, "List shell built-in commands"),
598#endif
599 BLTIN(NULL, NULL, NULL)
Eric Andersen25f27032001-04-26 23:22:31 +0000600};
601
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +0000602#if ENABLE_HUSH_JOB
Denis Vlasenkob81b3df2007-04-28 16:48:04 +0000603
Denis Vlasenkoa6a17852007-04-28 16:42:11 +0000604/* move to libbb? */
605static void signal_SA_RESTART(int sig, void (*handler)(int))
606{
607 struct sigaction sa;
608 sa.sa_handler = handler;
609 sa.sa_flags = SA_RESTART;
610 sigemptyset(&sa.sa_mask);
611 sigaction(sig, &sa, NULL);
612}
613
Denis Vlasenko3ac0e002007-04-28 16:45:22 +0000614/* Signals are grouped, we handle them in batches */
615static void set_fatal_sighandler(void (*handler)(int))
616{
617 signal(SIGILL , handler);
618 signal(SIGTRAP, handler);
619 signal(SIGABRT, handler);
620 signal(SIGFPE , handler);
621 signal(SIGBUS , handler);
622 signal(SIGSEGV, handler);
623 /* bash 3.2 seems to handle these just like 'fatal' ones */
624 signal(SIGHUP , handler);
625 signal(SIGPIPE, handler);
626 signal(SIGALRM, handler);
627}
628static void set_jobctrl_sighandler(void (*handler)(int))
629{
630 signal(SIGTSTP, handler);
631 signal(SIGTTIN, handler);
632 signal(SIGTTOU, handler);
633}
634static void set_misc_sighandler(void (*handler)(int))
635{
636 signal(SIGINT , handler);
637 signal(SIGQUIT, handler);
638 signal(SIGTERM, handler);
639}
640/* SIGCHLD is special and handled separately */
641
642static void set_every_sighandler(void (*handler)(int))
643{
644 set_fatal_sighandler(handler);
645 set_jobctrl_sighandler(handler);
646 set_misc_sighandler(handler);
647 signal(SIGCHLD, handler);
648}
649
Denis Vlasenkob5eaabb2007-04-28 16:45:59 +0000650static void handler_ctrl_c(int sig)
651{
Denis Vlasenkod01ff132007-05-02 21:40:23 +0000652 debug_printf_jobs("got sig %d\n", sig);
Denis Vlasenkob5eaabb2007-04-28 16:45:59 +0000653// as usual we can have all kinds of nasty problems with leaked malloc data here
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +0000654 siglongjmp(toplevel_jb, 1);
Denis Vlasenkob5eaabb2007-04-28 16:45:59 +0000655}
656
Denis Vlasenkoa6a17852007-04-28 16:42:11 +0000657static void handler_ctrl_z(int sig)
658{
659 pid_t pid;
660
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +0000661 debug_printf_jobs("got tty sig %d in pid %d\n", sig, getpid());
Denis Vlasenkoa6a17852007-04-28 16:42:11 +0000662 pid = fork();
Denis Vlasenkoc2990322007-05-16 12:57:12 +0000663 if (pid < 0) /* can't fork. Pretend there was no ctrl-Z */
Denis Vlasenkoa6a17852007-04-28 16:42:11 +0000664 return;
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +0000665 ctrl_z_flag = 1;
Denis Vlasenkoa6a17852007-04-28 16:42:11 +0000666 if (!pid) { /* child */
Denis Vlasenkoa6a17852007-04-28 16:42:11 +0000667 setpgrp();
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +0000668 debug_printf_jobs("set pgrp for child %d ok\n", getpid());
Denis Vlasenko3ac0e002007-04-28 16:45:22 +0000669 set_every_sighandler(SIG_DFL);
Denis Vlasenko18e19f22007-04-28 16:43:18 +0000670 raise(SIGTSTP); /* resend TSTP so that child will be stopped */
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +0000671 debug_printf_jobs("returning in child\n");
Denis Vlasenkoa6a17852007-04-28 16:42:11 +0000672 /* return to nofork, it will eventually exit now,
673 * not return back to shell */
674 return;
675 }
676 /* parent */
677 /* finish filling up pipe info */
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +0000678 toplevel_list->pgrp = pid; /* child is in its own pgrp */
679 toplevel_list->progs[0].pid = pid;
Denis Vlasenkoa6a17852007-04-28 16:42:11 +0000680 /* parent needs to longjmp out of running nofork.
681 * we will "return" exitcode 0, with child put in background */
682// as usual we can have all kinds of nasty problems with leaked malloc data here
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +0000683 debug_printf_jobs("siglongjmp in parent\n");
684 siglongjmp(toplevel_jb, 1);
Denis Vlasenkoa6a17852007-04-28 16:42:11 +0000685}
686
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +0000687/* Restores tty foreground process group, and exits.
688 * May be called as signal handler for fatal signal
689 * (will faithfully resend signal to itself, producing correct exit state)
690 * or called directly with -EXITCODE.
691 * We also call it if xfunc is exiting. */
692static void sigexit(int sig) ATTRIBUTE_NORETURN;
693static void sigexit(int sig)
694{
695 sigset_t block_all;
696
697 /* Disable all signals: job control, SIGPIPE, etc. */
698 sigfillset(&block_all);
699 sigprocmask(SIG_SETMASK, &block_all, NULL);
700
Denis Vlasenko87cb2db2007-04-21 10:00:01 +0000701 if (interactive_fd)
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +0000702 tcsetpgrp(interactive_fd, saved_tty_pgrp);
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +0000703
704 /* Not a signal, just exit */
705 if (sig <= 0)
706 _exit(- sig);
707
708 /* Enable only this sig and kill ourself with it */
709 signal(sig, SIG_DFL);
710 sigdelset(&block_all, sig);
711 sigprocmask(SIG_SETMASK, &block_all, NULL);
712 raise(sig);
713 _exit(1); /* Should not reach it */
714}
715
716/* Restores tty foreground process group, and exits. */
717static void hush_exit(int exitcode) ATTRIBUTE_NORETURN;
718static void hush_exit(int exitcode)
719{
720 fflush(NULL); /* flush all streams */
721 sigexit(- (exitcode & 0xff));
722}
723
Denis Vlasenkoef36ead2007-05-02 15:34:47 +0000724#else /* !JOB */
Denis Vlasenkob81b3df2007-04-28 16:48:04 +0000725
726#define set_fatal_sighandler(handler) ((void)0)
727#define set_jobctrl_sighandler(handler) ((void)0)
728#define set_misc_sighandler(handler) ((void)0)
Denis Vlasenkoef36ead2007-05-02 15:34:47 +0000729#define hush_exit(e) exit(e)
Denis Vlasenkob81b3df2007-04-28 16:48:04 +0000730
Denis Vlasenkoef36ead2007-05-02 15:34:47 +0000731#endif /* JOB */
Denis Vlasenkob81b3df2007-04-28 16:48:04 +0000732
733
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000734static const char *set_cwd(void)
735{
Denis Vlasenko0c886c62007-01-30 22:30:09 +0000736 if (cwd == bb_msg_unknown)
Denis Vlasenko7cced6e2007-04-12 17:08:53 +0000737 cwd = NULL; /* xrealloc_getcwd_or_warn(arg) calls free(arg)! */
Denis Vlasenko6ca04442007-02-11 16:19:28 +0000738 cwd = xrealloc_getcwd_or_warn((char *)cwd);
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000739 if (!cwd)
Manuel Novoa III cad53642003-03-19 09:13:01 +0000740 cwd = bb_msg_unknown;
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000741 return cwd;
742}
743
Eric Andersen4c9b68f2002-04-13 12:33:41 +0000744/* built-in 'eval' handler */
Denis Vlasenko1359da62007-04-21 23:27:30 +0000745static int builtin_eval(char **argv)
Eric Andersen4c9b68f2002-04-13 12:33:41 +0000746{
Eric Andersen4c9b68f2002-04-13 12:33:41 +0000747 int rcode = EXIT_SUCCESS;
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000748
Denis Vlasenko1359da62007-04-21 23:27:30 +0000749 if (argv[1]) {
Denis Vlasenko170435c2007-05-23 13:01:10 +0000750 char *str = expand_strvec_to_string(argv + 1);
751 parse_and_run_string(str, PARSEFLAG_EXIT_FROM_LOOP |
Denis Vlasenko219e88d2007-05-21 10:18:23 +0000752 PARSEFLAG_SEMICOLON);
Eric Andersen4c9b68f2002-04-13 12:33:41 +0000753 free(str);
754 rcode = last_return_code;
755 }
756 return rcode;
757}
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000758
Eric Andersen25f27032001-04-26 23:22:31 +0000759/* built-in 'cd <path>' handler */
Denis Vlasenko1359da62007-04-21 23:27:30 +0000760static int builtin_cd(char **argv)
Eric Andersen25f27032001-04-26 23:22:31 +0000761{
Denis Vlasenko170435c2007-05-23 13:01:10 +0000762 const char *newdir;
Denis Vlasenko1359da62007-04-21 23:27:30 +0000763 if (argv[1] == NULL)
Denis Vlasenko170435c2007-05-23 13:01:10 +0000764 newdir = getenv("HOME") ? : "/";
Eric Andersen25f27032001-04-26 23:22:31 +0000765 else
Denis Vlasenko1359da62007-04-21 23:27:30 +0000766 newdir = argv[1];
Eric Andersen25f27032001-04-26 23:22:31 +0000767 if (chdir(newdir)) {
768 printf("cd: %s: %s\n", newdir, strerror(errno));
769 return EXIT_FAILURE;
770 }
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000771 set_cwd();
Eric Andersen25f27032001-04-26 23:22:31 +0000772 return EXIT_SUCCESS;
773}
774
Eric Andersen25f27032001-04-26 23:22:31 +0000775/* built-in 'exec' handler */
Denis Vlasenko1359da62007-04-21 23:27:30 +0000776static int builtin_exec(char **argv)
Eric Andersen25f27032001-04-26 23:22:31 +0000777{
Denis Vlasenko1359da62007-04-21 23:27:30 +0000778 if (argv[1] == NULL)
Eric Andersen25f27032001-04-26 23:22:31 +0000779 return EXIT_SUCCESS; /* Really? */
Denis Vlasenko1359da62007-04-21 23:27:30 +0000780 pseudo_exec_argv(argv + 1);
Eric Andersen25f27032001-04-26 23:22:31 +0000781 /* never returns */
782}
783
784/* built-in 'exit' handler */
Denis Vlasenko1359da62007-04-21 23:27:30 +0000785static int builtin_exit(char **argv)
Eric Andersen25f27032001-04-26 23:22:31 +0000786{
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +0000787// TODO: bash does it ONLY on top-level sh exit (+interacive only?)
788 //puts("exit"); /* bash does it */
Denis Vlasenkof2fffd02007-05-02 23:39:04 +0000789// TODO: warn if we have background jobs: "There are stopped jobs"
790// On second consecutive 'exit', exit anyway.
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +0000791
Denis Vlasenko1359da62007-04-21 23:27:30 +0000792 if (argv[1] == NULL)
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +0000793 hush_exit(last_return_code);
Denis Vlasenko5f786c22007-04-20 08:35:45 +0000794 /* mimic bash: exit 123abc == exit 255 + error msg */
795 xfunc_error_retval = 255;
796 /* bash: exit -2 == exit 254, no error msg */
Denis Vlasenkof2fffd02007-05-02 23:39:04 +0000797 hush_exit(xatoi(argv[1]) & 0xff);
Eric Andersen25f27032001-04-26 23:22:31 +0000798}
799
800/* built-in 'export VAR=value' handler */
Denis Vlasenko1359da62007-04-21 23:27:30 +0000801static int builtin_export(char **argv)
Eric Andersen25f27032001-04-26 23:22:31 +0000802{
Denis Vlasenkod76c0492007-05-25 02:16:25 +0000803 const char *value;
Denis Vlasenko1359da62007-04-21 23:27:30 +0000804 char *name = argv[1];
Eric Andersen25f27032001-04-26 23:22:31 +0000805
Eric Andersenf72f5622001-05-15 23:21:41 +0000806 if (name == NULL) {
Denis Vlasenkof2fffd02007-05-02 23:39:04 +0000807 // TODO:
808 // ash emits: export VAR='VAL'
809 // bash: declare -x VAR="VAL"
810 // (both also escape as needed (quotes, $, etc))
811 char **e = environ;
812 if (e)
813 while (*e)
814 puts(*e++);
815 return EXIT_SUCCESS;
Eric Andersen25f27032001-04-26 23:22:31 +0000816 }
Eric Andersenf72f5622001-05-15 23:21:41 +0000817
Denis Vlasenkod76c0492007-05-25 02:16:25 +0000818 value = strchr(name, '=');
819 if (!value) {
820 /* They are exporting something without a =VALUE */
821 struct variable *var;
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000822
Denis Vlasenkod76c0492007-05-25 02:16:25 +0000823 var = get_local_var(name);
824 if (var) {
825 var->flg_export = 1;
Denis Vlasenko28c0f0f2007-05-25 02:46:01 +0000826 putenv(var->varstr);
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000827 }
Denis Vlasenkod76c0492007-05-25 02:16:25 +0000828 /* bash does not return an error when trying to export
829 * an undefined variable. Do likewise. */
830 return EXIT_SUCCESS;
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000831 }
Denis Vlasenkod76c0492007-05-25 02:16:25 +0000832
833 set_local_var(xstrdup(name), 1);
834 return EXIT_SUCCESS;
Eric Andersen25f27032001-04-26 23:22:31 +0000835}
836
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +0000837#if ENABLE_HUSH_JOB
Eric Andersen25f27032001-04-26 23:22:31 +0000838/* built-in 'fg' and 'bg' handler */
Denis Vlasenko1359da62007-04-21 23:27:30 +0000839static int builtin_fg_bg(char **argv)
Eric Andersen25f27032001-04-26 23:22:31 +0000840{
Eric Andersen0fcd4472001-05-02 20:12:03 +0000841 int i, jobnum;
Denis Vlasenko8a28e622007-04-14 11:16:29 +0000842 struct pipe *pi;
Eric Andersen25f27032001-04-26 23:22:31 +0000843
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +0000844 if (!interactive_fd)
Eric Andersenc798b072001-06-22 06:23:03 +0000845 return EXIT_FAILURE;
Eric Andersen0fcd4472001-05-02 20:12:03 +0000846 /* If they gave us no args, assume they want the last backgrounded task */
Denis Vlasenko1359da62007-04-21 23:27:30 +0000847 if (!argv[1]) {
Eric Andersenc798b072001-06-22 06:23:03 +0000848 for (pi = job_list; pi; pi = pi->next) {
849 if (pi->jobid == last_jobid) {
Denis Vlasenko8a28e622007-04-14 11:16:29 +0000850 goto found;
Eric Andersen0fcd4472001-05-02 20:12:03 +0000851 }
852 }
Denis Vlasenko1359da62007-04-21 23:27:30 +0000853 bb_error_msg("%s: no current job", argv[0]);
Denis Vlasenko8a28e622007-04-14 11:16:29 +0000854 return EXIT_FAILURE;
855 }
Denis Vlasenko1359da62007-04-21 23:27:30 +0000856 if (sscanf(argv[1], "%%%d", &jobnum) != 1) {
857 bb_error_msg("%s: bad argument '%s'", argv[0], argv[1]);
Denis Vlasenko8a28e622007-04-14 11:16:29 +0000858 return EXIT_FAILURE;
859 }
860 for (pi = job_list; pi; pi = pi->next) {
861 if (pi->jobid == jobnum) {
862 goto found;
Eric Andersen25f27032001-04-26 23:22:31 +0000863 }
864 }
Denis Vlasenko1359da62007-04-21 23:27:30 +0000865 bb_error_msg("%s: %d: no such job", argv[0], jobnum);
Denis Vlasenko8a28e622007-04-14 11:16:29 +0000866 return EXIT_FAILURE;
867 found:
Denis Vlasenko52881e92007-04-21 13:42:52 +0000868 // TODO: bash prints a string representation
869 // of job being foregrounded (like "sleep 1 | cat")
Denis Vlasenko1359da62007-04-21 23:27:30 +0000870 if (*argv[0] == 'f') {
Eric Andersen028b65b2001-06-28 01:10:11 +0000871 /* Put the job into the foreground. */
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +0000872 tcsetpgrp(interactive_fd, pi->pgrp);
Eric Andersen25f27032001-04-26 23:22:31 +0000873 }
874
875 /* Restart the processes in the job */
Denis Vlasenkod01ff132007-05-02 21:40:23 +0000876 debug_printf_jobs("reviving %d procs, pgrp %d\n", pi->num_progs, pi->pgrp);
Denis Vlasenko1359da62007-04-21 23:27:30 +0000877 for (i = 0; i < pi->num_progs; i++) {
Denis Vlasenkod01ff132007-05-02 21:40:23 +0000878 debug_printf_jobs("reviving pid %d\n", pi->progs[i].pid);
Eric Andersen0fcd4472001-05-02 20:12:03 +0000879 pi->progs[i].is_stopped = 0;
Denis Vlasenko1359da62007-04-21 23:27:30 +0000880 }
881 pi->stopped_progs = 0;
Eric Andersen25f27032001-04-26 23:22:31 +0000882
Denis Vlasenkobb81c582007-01-30 22:32:09 +0000883 i = kill(- pi->pgrp, SIGCONT);
884 if (i < 0) {
Denis Vlasenko8a28e622007-04-14 11:16:29 +0000885 if (errno == ESRCH) {
Denis Vlasenko1359da62007-04-21 23:27:30 +0000886 delete_finished_bg_job(pi);
Denis Vlasenko3ac0e002007-04-28 16:45:22 +0000887 return EXIT_SUCCESS;
Eric Andersen028b65b2001-06-28 01:10:11 +0000888 } else {
Manuel Novoa III cad53642003-03-19 09:13:01 +0000889 bb_perror_msg("kill (SIGCONT)");
Eric Andersen028b65b2001-06-28 01:10:11 +0000890 }
891 }
Eric Andersen25f27032001-04-26 23:22:31 +0000892
Denis Vlasenko1359da62007-04-21 23:27:30 +0000893 if (*argv[0] == 'f') {
894 remove_bg_job(pi);
Denis Vlasenko52881e92007-04-21 13:42:52 +0000895 return checkjobs_and_fg_shell(pi);
Denis Vlasenko1359da62007-04-21 23:27:30 +0000896 }
Eric Andersen25f27032001-04-26 23:22:31 +0000897 return EXIT_SUCCESS;
898}
Denis Vlasenkob81b3df2007-04-28 16:48:04 +0000899#endif
Eric Andersen25f27032001-04-26 23:22:31 +0000900
901/* built-in 'help' handler */
Denis Vlasenko06810332007-05-21 23:30:54 +0000902#if ENABLE_HUSH_HELP
Denis Vlasenko1359da62007-04-21 23:27:30 +0000903static int builtin_help(char **argv ATTRIBUTE_UNUSED)
Eric Andersen25f27032001-04-26 23:22:31 +0000904{
"Vladimir N. Oleynik"485d7cb2005-10-17 09:48:57 +0000905 const struct built_in_command *x;
Eric Andersen25f27032001-04-26 23:22:31 +0000906
907 printf("\nBuilt-in commands:\n");
908 printf("-------------------\n");
909 for (x = bltins; x->cmd; x++) {
Eric Andersen25f27032001-04-26 23:22:31 +0000910 printf("%s\t%s\n", x->cmd, x->descr);
911 }
912 printf("\n\n");
913 return EXIT_SUCCESS;
914}
Denis Vlasenko06810332007-05-21 23:30:54 +0000915#endif
Eric Andersen25f27032001-04-26 23:22:31 +0000916
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +0000917#if ENABLE_HUSH_JOB
Eric Andersen25f27032001-04-26 23:22:31 +0000918/* built-in 'jobs' handler */
Denis Vlasenko1359da62007-04-21 23:27:30 +0000919static int builtin_jobs(char **argv ATTRIBUTE_UNUSED)
Eric Andersen25f27032001-04-26 23:22:31 +0000920{
921 struct pipe *job;
Denis Vlasenko0c886c62007-01-30 22:30:09 +0000922 const char *status_string;
Eric Andersen25f27032001-04-26 23:22:31 +0000923
Eric Andersenc798b072001-06-22 06:23:03 +0000924 for (job = job_list; job; job = job->next) {
Eric Andersen25f27032001-04-26 23:22:31 +0000925 if (job->running_progs == job->stopped_progs)
926 status_string = "Stopped";
927 else
928 status_string = "Running";
Eric Andersen52a97ca2001-06-22 06:49:26 +0000929
Denis Vlasenko3ac0e002007-04-28 16:45:22 +0000930 printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->cmdtext);
Eric Andersen25f27032001-04-26 23:22:31 +0000931 }
932 return EXIT_SUCCESS;
933}
Denis Vlasenkob81b3df2007-04-28 16:48:04 +0000934#endif
Eric Andersen25f27032001-04-26 23:22:31 +0000935
Eric Andersen25f27032001-04-26 23:22:31 +0000936/* built-in 'pwd' handler */
Denis Vlasenko1359da62007-04-21 23:27:30 +0000937static int builtin_pwd(char **argv ATTRIBUTE_UNUSED)
Eric Andersen25f27032001-04-26 23:22:31 +0000938{
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000939 puts(set_cwd());
Eric Andersen25f27032001-04-26 23:22:31 +0000940 return EXIT_SUCCESS;
941}
942
943/* built-in 'read VAR' handler */
Denis Vlasenko1359da62007-04-21 23:27:30 +0000944static int builtin_read(char **argv)
Eric Andersen25f27032001-04-26 23:22:31 +0000945{
Denis Vlasenkod67cef22007-06-13 06:47:47 +0000946 char *string;
Denis Vlasenko3e7b0e62007-05-16 12:52:15 +0000947 const char *name = argv[1] ? argv[1] : "REPLY";
Eric Andersen25f27032001-04-26 23:22:31 +0000948
Denis Vlasenkod67cef22007-06-13 06:47:47 +0000949 string = xmalloc_reads(STDIN_FILENO, xasprintf("%s=", name));
950 return set_local_var(string, 0);
Eric Andersen25f27032001-04-26 23:22:31 +0000951}
952
Denis Vlasenko3e7b0e62007-05-16 12:52:15 +0000953/* built-in 'set [VAR=value]' handler */
Denis Vlasenko1359da62007-04-21 23:27:30 +0000954static int builtin_set(char **argv)
Eric Andersenf72f5622001-05-15 23:21:41 +0000955{
Denis Vlasenko1359da62007-04-21 23:27:30 +0000956 char *temp = argv[1];
Denis Vlasenkod76c0492007-05-25 02:16:25 +0000957 struct variable *e;
Eric Andersenf72f5622001-05-15 23:21:41 +0000958
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000959 if (temp == NULL)
Denis Vlasenkod76c0492007-05-25 02:16:25 +0000960 for (e = top_var; e; e = e->next)
Denis Vlasenko28c0f0f2007-05-25 02:46:01 +0000961 puts(e->varstr);
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000962 else
Denis Vlasenkod76c0492007-05-25 02:16:25 +0000963 set_local_var(xstrdup(temp), 0);
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000964
Denis Vlasenko0c886c62007-01-30 22:30:09 +0000965 return EXIT_SUCCESS;
Eric Andersenf72f5622001-05-15 23:21:41 +0000966}
967
968
Eric Andersen25f27032001-04-26 23:22:31 +0000969/* Built-in 'shift' handler */
Denis Vlasenko1359da62007-04-21 23:27:30 +0000970static int builtin_shift(char **argv)
Eric Andersen25f27032001-04-26 23:22:31 +0000971{
Denis Vlasenko0c886c62007-01-30 22:30:09 +0000972 int n = 1;
Denis Vlasenko1359da62007-04-21 23:27:30 +0000973 if (argv[1]) {
974 n = atoi(argv[1]);
Eric Andersen25f27032001-04-26 23:22:31 +0000975 }
Denis Vlasenko0c886c62007-01-30 22:30:09 +0000976 if (n >= 0 && n < global_argc) {
Denis Vlasenko004baba2007-05-20 22:22:18 +0000977 global_argv[n] = global_argv[0];
Eric Andersen25f27032001-04-26 23:22:31 +0000978 global_argc -= n;
979 global_argv += n;
980 return EXIT_SUCCESS;
Eric Andersen25f27032001-04-26 23:22:31 +0000981 }
Denis Vlasenkof03dbed2007-04-13 19:55:50 +0000982 return EXIT_FAILURE;
Eric Andersen25f27032001-04-26 23:22:31 +0000983}
984
985/* Built-in '.' handler (read-in and execute commands from file) */
Denis Vlasenko1359da62007-04-21 23:27:30 +0000986static int builtin_source(char **argv)
Eric Andersen25f27032001-04-26 23:22:31 +0000987{
988 FILE *input;
989 int status;
990
Denis Vlasenko1359da62007-04-21 23:27:30 +0000991 if (argv[1] == NULL)
Eric Andersen25f27032001-04-26 23:22:31 +0000992 return EXIT_FAILURE;
993
994 /* XXX search through $PATH is missing */
Denis Vlasenko1359da62007-04-21 23:27:30 +0000995 input = fopen(argv[1], "r");
Eric Andersen25f27032001-04-26 23:22:31 +0000996 if (!input) {
Denis Vlasenko1359da62007-04-21 23:27:30 +0000997 bb_error_msg("cannot open '%s'", argv[1]);
Eric Andersen25f27032001-04-26 23:22:31 +0000998 return EXIT_FAILURE;
999 }
1000
1001 /* Now run the file */
1002 /* XXX argv and argc are broken; need to save old global_argv
1003 * (pointer only is OK!) on this stack frame,
Denis Vlasenko1359da62007-04-21 23:27:30 +00001004 * set global_argv=argv+1, recurse, and restore. */
Eric Andersen25f27032001-04-26 23:22:31 +00001005 mark_open(fileno(input));
Denis Vlasenko170435c2007-05-23 13:01:10 +00001006 status = parse_and_run_file(input);
Eric Andersen25f27032001-04-26 23:22:31 +00001007 mark_closed(fileno(input));
1008 fclose(input);
Denis Vlasenkod9e15f22006-11-27 16:49:55 +00001009 return status;
Eric Andersen25f27032001-04-26 23:22:31 +00001010}
1011
Denis Vlasenko1359da62007-04-21 23:27:30 +00001012static int builtin_umask(char **argv)
Eric Andersen25f27032001-04-26 23:22:31 +00001013{
Eric Andersen83a2ae22001-05-07 17:59:25 +00001014 mode_t new_umask;
Denis Vlasenko1359da62007-04-21 23:27:30 +00001015 const char *arg = argv[1];
Eric Andersen83a2ae22001-05-07 17:59:25 +00001016 char *end;
1017 if (arg) {
Denis Vlasenko0c886c62007-01-30 22:30:09 +00001018 new_umask = strtoul(arg, &end, 8);
1019 if (*end != '\0' || end == arg) {
Eric Andersen83a2ae22001-05-07 17:59:25 +00001020 return EXIT_FAILURE;
1021 }
1022 } else {
Denis Vlasenko0c886c62007-01-30 22:30:09 +00001023 new_umask = umask(0);
1024 printf("%.3o\n", (unsigned) new_umask);
Eric Andersen83a2ae22001-05-07 17:59:25 +00001025 }
1026 umask(new_umask);
1027 return EXIT_SUCCESS;
Eric Andersen25f27032001-04-26 23:22:31 +00001028}
1029
1030/* built-in 'unset VAR' handler */
Denis Vlasenko1359da62007-04-21 23:27:30 +00001031static int builtin_unset(char **argv)
Eric Andersen25f27032001-04-26 23:22:31 +00001032{
Denis Vlasenko3e7b0e62007-05-16 12:52:15 +00001033 /* bash always returns true */
Denis Vlasenko1359da62007-04-21 23:27:30 +00001034 unset_local_var(argv[1]);
Eric Andersen25f27032001-04-26 23:22:31 +00001035 return EXIT_SUCCESS;
1036}
1037
Denis Vlasenko06810332007-05-21 23:30:54 +00001038//static int builtin_not_written(char **argv)
1039//{
1040// printf("builtin_%s not written\n", argv[0]);
1041// return EXIT_FAILURE;
1042//}
Eric Andersen83a2ae22001-05-07 17:59:25 +00001043
Eric Andersen25f27032001-04-26 23:22:31 +00001044static int b_check_space(o_string *o, int len)
1045{
1046 /* It would be easy to drop a more restrictive policy
1047 * in here, such as setting a maximum string length */
1048 if (o->length + len > o->maxlen) {
Denis Vlasenkof5294e12007-04-14 10:09:57 +00001049 /* assert(data == NULL || o->maxlen != 0); */
Denis Vlasenkoef36ead2007-05-02 15:34:47 +00001050 o->maxlen += (2*len > B_CHUNK ? 2*len : B_CHUNK);
Denis Vlasenkoc666f712007-05-16 22:18:54 +00001051 o->data = xrealloc(o->data, 1 + o->maxlen);
Eric Andersen25f27032001-04-26 23:22:31 +00001052 }
1053 return o->data == NULL;
1054}
1055
1056static int b_addchr(o_string *o, int ch)
1057{
Denis Vlasenko831dcc42007-05-16 15:05:36 +00001058 debug_printf("b_addchr: '%c' o->length=%d o=%p\n", ch, o->length, o);
Denis Vlasenko0c886c62007-01-30 22:30:09 +00001059 if (b_check_space(o, 1))
1060 return B_NOSPAC;
Eric Andersen25f27032001-04-26 23:22:31 +00001061 o->data[o->length] = ch;
1062 o->length++;
1063 o->data[o->length] = '\0';
1064 return 0;
1065}
1066
1067static void b_reset(o_string *o)
1068{
1069 o->length = 0;
1070 o->nonnull = 0;
Denis Vlasenko0c886c62007-01-30 22:30:09 +00001071 if (o->data != NULL)
1072 *o->data = '\0';
Eric Andersen25f27032001-04-26 23:22:31 +00001073}
1074
1075static void b_free(o_string *o)
1076{
1077 b_reset(o);
Aaron Lehmanna170e1c2002-11-28 11:27:31 +00001078 free(o->data);
Eric Andersen25f27032001-04-26 23:22:31 +00001079 o->data = NULL;
1080 o->maxlen = 0;
1081}
1082
1083/* My analysis of quoting semantics tells me that state information
1084 * is associated with a destination, not a source.
1085 */
1086static int b_addqchr(o_string *o, int ch, int quote)
1087{
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00001088 if (quote && strchr("*?[\\", ch)) {
Eric Andersen25f27032001-04-26 23:22:31 +00001089 int rc;
1090 rc = b_addchr(o, '\\');
Denis Vlasenko0c886c62007-01-30 22:30:09 +00001091 if (rc)
1092 return rc;
Eric Andersen25f27032001-04-26 23:22:31 +00001093 }
1094 return b_addchr(o, ch);
1095}
1096
Eric Andersen25f27032001-04-26 23:22:31 +00001097static int static_get(struct in_str *i)
1098{
Denis Vlasenko0c886c62007-01-30 22:30:09 +00001099 int ch = *i->p++;
1100 if (ch == '\0') return EOF;
Eric Andersen25f27032001-04-26 23:22:31 +00001101 return ch;
1102}
1103
1104static int static_peek(struct in_str *i)
1105{
1106 return *i->p;
1107}
1108
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00001109#if ENABLE_HUSH_INTERACTIVE
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00001110#if ENABLE_FEATURE_EDITING
Rob Landley88621d72006-08-29 19:41:06 +00001111static void cmdedit_set_initial_prompt(void)
Eric Andersen25f27032001-04-26 23:22:31 +00001112{
Denis Vlasenko38f63192007-01-22 09:03:07 +00001113#if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
Eric Andersen25f27032001-04-26 23:22:31 +00001114 PS1 = NULL;
1115#else
1116 PS1 = getenv("PS1");
Denis Vlasenko0c886c62007-01-30 22:30:09 +00001117 if (PS1 == NULL)
Eric Andersen25f27032001-04-26 23:22:31 +00001118 PS1 = "\\w \\$ ";
Eric Andersenc7bda1c2004-03-15 08:29:22 +00001119#endif
Eric Andersen25f27032001-04-26 23:22:31 +00001120}
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00001121#endif /* EDITING */
Eric Andersen25f27032001-04-26 23:22:31 +00001122
Denis Vlasenkoc72c1ed2007-01-30 22:31:26 +00001123static const char* setup_prompt_string(int promptmode)
Eric Andersen25f27032001-04-26 23:22:31 +00001124{
Denis Vlasenkoc72c1ed2007-01-30 22:31:26 +00001125 const char *prompt_str;
1126 debug_printf("setup_prompt_string %d ", promptmode);
Denis Vlasenko38f63192007-01-22 09:03:07 +00001127#if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
Eric Andersen25f27032001-04-26 23:22:31 +00001128 /* Set up the prompt */
Denis Vlasenko5a1437d2007-05-24 13:22:47 +00001129 if (promptmode == 0) { /* PS1 */
Denis Vlasenkoc72c1ed2007-01-30 22:31:26 +00001130 free((char*)PS1);
Denis Vlasenko5a1437d2007-05-24 13:22:47 +00001131 PS1 = xasprintf("%s %c ", cwd, (geteuid() != 0) ? '$' : '#');
1132 prompt_str = PS1;
Eric Andersen25f27032001-04-26 23:22:31 +00001133 } else {
Denis Vlasenkoc72c1ed2007-01-30 22:31:26 +00001134 prompt_str = PS2;
Eric Andersen25f27032001-04-26 23:22:31 +00001135 }
1136#else
Denis Vlasenko5a1437d2007-05-24 13:22:47 +00001137 prompt_str = (promptmode == 0) ? PS1 : PS2;
Eric Andersenaf44a0e2001-04-27 07:26:12 +00001138#endif
Denis Vlasenko5a1437d2007-05-24 13:22:47 +00001139 debug_printf("result '%s'\n", prompt_str);
Denis Vlasenkoc72c1ed2007-01-30 22:31:26 +00001140 return prompt_str;
Eric Andersen25f27032001-04-26 23:22:31 +00001141}
1142
Denis Vlasenko3e9aaae2007-05-11 12:56:43 +00001143static void get_user_input(struct in_str *i)
Eric Andersen25f27032001-04-26 23:22:31 +00001144{
Denis Vlasenko0937be52007-04-28 16:47:08 +00001145 int r;
Denis Vlasenkoc72c1ed2007-01-30 22:31:26 +00001146 const char *prompt_str;
Denis Vlasenko3e9aaae2007-05-11 12:56:43 +00001147
Denis Vlasenkoc72c1ed2007-01-30 22:31:26 +00001148 prompt_str = setup_prompt_string(i->promptmode);
Denis Vlasenko38f63192007-01-22 09:03:07 +00001149#if ENABLE_FEATURE_EDITING
Denis Vlasenko170435c2007-05-23 13:01:10 +00001150 /* Enable command line editing only while a command line
1151 * is actually being read; otherwise, we'll end up bequeathing
1152 * atexit() handlers and other unwanted stuff to our
1153 * child processes (rob@sysgo.de) */
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +00001154 r = read_line_input(prompt_str, user_input_buf, BUFSIZ-1, line_input_state);
Denis Vlasenko3e9aaae2007-05-11 12:56:43 +00001155 i->eof_flag = (r < 0);
1156 if (i->eof_flag) { /* EOF/error detected */
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +00001157 user_input_buf[0] = EOF; /* yes, it will be truncated, it's ok */
1158 user_input_buf[1] = '\0';
Denis Vlasenko3e9aaae2007-05-11 12:56:43 +00001159 }
Eric Andersen25f27032001-04-26 23:22:31 +00001160#else
1161 fputs(prompt_str, stdout);
1162 fflush(stdout);
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +00001163 user_input_buf[0] = r = fgetc(i->file);
1164 /*user_input_buf[1] = '\0'; - already is and never changed */
Denis Vlasenko3e9aaae2007-05-11 12:56:43 +00001165 i->eof_flag = (r == EOF);
Eric Andersen25f27032001-04-26 23:22:31 +00001166#endif
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +00001167 i->p = user_input_buf;
Eric Andersen25f27032001-04-26 23:22:31 +00001168}
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00001169#endif /* INTERACTIVE */
Eric Andersen25f27032001-04-26 23:22:31 +00001170
Eric Andersenc7bda1c2004-03-15 08:29:22 +00001171/* This is the magic location that prints prompts
Eric Andersen25f27032001-04-26 23:22:31 +00001172 * and gets data back from the user */
1173static int file_get(struct in_str *i)
1174{
1175 int ch;
1176
Eric Andersen25f27032001-04-26 23:22:31 +00001177 /* If there is data waiting, eat it up */
Denis Vlasenko3e9aaae2007-05-11 12:56:43 +00001178 if (i->p && *i->p) {
Denis Vlasenko96f67dc2007-05-17 13:02:41 +00001179#if ENABLE_HUSH_INTERACTIVE
Denis Vlasenko3e9aaae2007-05-11 12:56:43 +00001180 take_cached:
Denis Vlasenko96f67dc2007-05-17 13:02:41 +00001181#endif
Denis Vlasenko3e9aaae2007-05-11 12:56:43 +00001182 ch = *i->p++;
1183 if (i->eof_flag && !*i->p)
1184 ch = EOF;
Eric Andersen25f27032001-04-26 23:22:31 +00001185 } else {
1186 /* need to double check i->file because we might be doing something
1187 * more complicated by now, like sourcing or substituting. */
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00001188#if ENABLE_HUSH_INTERACTIVE
Denis Vlasenko5a1437d2007-05-24 13:22:47 +00001189 if (interactive_fd && i->promptme && i->file == stdin) {
Denis Vlasenko3e9aaae2007-05-11 12:56:43 +00001190 do {
1191 get_user_input(i);
1192 } while (!*i->p); /* need non-empty line */
Denis Vlasenko5a1437d2007-05-24 13:22:47 +00001193 i->promptmode = 1; /* PS2 */
1194 i->promptme = 0;
Denis Vlasenko3e9aaae2007-05-11 12:56:43 +00001195 goto take_cached;
Eric Andersen25f27032001-04-26 23:22:31 +00001196 }
Denis Vlasenko96f67dc2007-05-17 13:02:41 +00001197#endif
1198 ch = fgetc(i->file);
Eric Andersen25f27032001-04-26 23:22:31 +00001199 }
Denis Vlasenko3e9aaae2007-05-11 12:56:43 +00001200 debug_printf("file_get: got a '%c' %d\n", ch, ch);
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00001201#if ENABLE_HUSH_INTERACTIVE
Denis Vlasenko0c886c62007-01-30 22:30:09 +00001202 if (ch == '\n')
Denis Vlasenko5a1437d2007-05-24 13:22:47 +00001203 i->promptme = 1;
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00001204#endif
Eric Andersen25f27032001-04-26 23:22:31 +00001205 return ch;
1206}
1207
1208/* All the callers guarantee this routine will never be
1209 * used right after a newline, so prompting is not needed.
1210 */
1211static int file_peek(struct in_str *i)
1212{
Denis Vlasenkoe0a33672007-05-10 23:06:55 +00001213 int ch;
Denis Vlasenko3e9aaae2007-05-11 12:56:43 +00001214 if (i->p && *i->p) {
1215 if (i->eof_flag && !i->p[1])
1216 return EOF;
1217 return *i->p;
Eric Andersen25f27032001-04-26 23:22:31 +00001218 }
Denis Vlasenkoe0a33672007-05-10 23:06:55 +00001219 ch = fgetc(i->file);
Denis Vlasenko3e9aaae2007-05-11 12:56:43 +00001220 i->eof_flag = (ch == EOF);
1221 i->peek_buf[0] = ch;
1222 i->peek_buf[1] = '\0';
1223 i->p = i->peek_buf;
1224 debug_printf("file_peek: got a '%c' %d\n", *i->p, *i->p);
Denis Vlasenkoe0a33672007-05-10 23:06:55 +00001225 return ch;
Eric Andersen25f27032001-04-26 23:22:31 +00001226}
1227
1228static void setup_file_in_str(struct in_str *i, FILE *f)
1229{
1230 i->peek = file_peek;
1231 i->get = file_get;
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00001232#if ENABLE_HUSH_INTERACTIVE
Denis Vlasenko5a1437d2007-05-24 13:22:47 +00001233 i->promptme = 1;
1234 i->promptmode = 0; /* PS1 */
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00001235#endif
Eric Andersen25f27032001-04-26 23:22:31 +00001236 i->file = f;
1237 i->p = NULL;
1238}
1239
1240static void setup_string_in_str(struct in_str *i, const char *s)
1241{
1242 i->peek = static_peek;
1243 i->get = static_get;
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00001244#if ENABLE_HUSH_INTERACTIVE
Denis Vlasenko5a1437d2007-05-24 13:22:47 +00001245 i->promptme = 1;
1246 i->promptmode = 0; /* PS1 */
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00001247#endif
Eric Andersen25f27032001-04-26 23:22:31 +00001248 i->p = s;
Denis Vlasenko3e9aaae2007-05-11 12:56:43 +00001249 i->eof_flag = 0;
Eric Andersen25f27032001-04-26 23:22:31 +00001250}
1251
1252static void mark_open(int fd)
1253{
1254 struct close_me *new = xmalloc(sizeof(struct close_me));
1255 new->fd = fd;
1256 new->next = close_me_head;
1257 close_me_head = new;
1258}
1259
1260static void mark_closed(int fd)
1261{
1262 struct close_me *tmp;
1263 if (close_me_head == NULL || close_me_head->fd != fd)
Manuel Novoa III cad53642003-03-19 09:13:01 +00001264 bb_error_msg_and_die("corrupt close_me");
Eric Andersen25f27032001-04-26 23:22:31 +00001265 tmp = close_me_head;
1266 close_me_head = close_me_head->next;
1267 free(tmp);
1268}
1269
Eric Anderseneaecbf32001-10-31 10:41:31 +00001270static void close_all(void)
Eric Andersen25f27032001-04-26 23:22:31 +00001271{
1272 struct close_me *c;
Denis Vlasenko0c886c62007-01-30 22:30:09 +00001273 for (c = close_me_head; c; c = c->next) {
Eric Andersen25f27032001-04-26 23:22:31 +00001274 close(c->fd);
1275 }
1276 close_me_head = NULL;
1277}
1278
1279/* squirrel != NULL means we squirrel away copies of stdin, stdout,
1280 * and stderr if they are redirected. */
1281static int setup_redirects(struct child_prog *prog, int squirrel[])
1282{
1283 int openfd, mode;
1284 struct redir_struct *redir;
1285
Denis Vlasenko0c886c62007-01-30 22:30:09 +00001286 for (redir = prog->redirects; redir; redir = redir->next) {
Eric Andersen817e73c2001-06-06 17:56:09 +00001287 if (redir->dup == -1 && redir->word.gl_pathv == NULL) {
1288 /* something went wrong in the parse. Pretend it didn't happen */
1289 continue;
1290 }
Eric Andersen25f27032001-04-26 23:22:31 +00001291 if (redir->dup == -1) {
Denis Vlasenko0c886c62007-01-30 22:30:09 +00001292 mode = redir_table[redir->type].mode;
Denis Vlasenkof03dbed2007-04-13 19:55:50 +00001293 openfd = open_or_warn(redir->word.gl_pathv[0], mode);
Eric Andersen25f27032001-04-26 23:22:31 +00001294 if (openfd < 0) {
1295 /* this could get lost if stderr has been redirected, but
1296 bash and ash both lose it as well (though zsh doesn't!) */
Eric Andersen25f27032001-04-26 23:22:31 +00001297 return 1;
1298 }
1299 } else {
1300 openfd = redir->dup;
1301 }
1302
1303 if (openfd != redir->fd) {
1304 if (squirrel && redir->fd < 3) {
1305 squirrel[redir->fd] = dup(redir->fd);
1306 }
Eric Andersen83a2ae22001-05-07 17:59:25 +00001307 if (openfd == -3) {
1308 close(openfd);
1309 } else {
1310 dup2(openfd, redir->fd);
Matt Kraaic616e532001-06-05 16:50:08 +00001311 if (redir->dup == -1)
Denis Vlasenkof03dbed2007-04-13 19:55:50 +00001312 close(openfd);
Eric Andersen83a2ae22001-05-07 17:59:25 +00001313 }
Eric Andersen25f27032001-04-26 23:22:31 +00001314 }
1315 }
1316 return 0;
1317}
1318
1319static void restore_redirects(int squirrel[])
1320{
1321 int i, fd;
Denis Vlasenko0c886c62007-01-30 22:30:09 +00001322 for (i = 0; i < 3; i++) {
Eric Andersen25f27032001-04-26 23:22:31 +00001323 fd = squirrel[i];
1324 if (fd != -1) {
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00001325 /* We simply die on error */
1326 xmove_fd(fd, i);
Eric Andersen25f27032001-04-26 23:22:31 +00001327 }
1328 }
1329}
1330
Eric Andersenada18ff2001-05-21 16:18:22 +00001331/* never returns */
Eric Andersen94ac2442001-05-22 19:05:18 +00001332/* XXX no exit() here. If you don't exec, use _exit instead.
1333 * The at_exit handlers apparently confuse the calling process,
Denis Vlasenko87cb2db2007-04-21 10:00:01 +00001334 * in particular stdin handling. Not sure why? -- because of vfork! (vda) */
Denis Vlasenko1359da62007-04-21 23:27:30 +00001335static void pseudo_exec_argv(char **argv)
Eric Andersen25f27032001-04-26 23:22:31 +00001336{
Eric Andersen78a7c992001-05-15 16:30:25 +00001337 int i, rcode;
Eric Andersen4c9b68f2002-04-13 12:33:41 +00001338 char *p;
"Vladimir N. Oleynik"485d7cb2005-10-17 09:48:57 +00001339 const struct built_in_command *x;
Denis Vlasenko87cb2db2007-04-21 10:00:01 +00001340
Denis Vlasenko1359da62007-04-21 23:27:30 +00001341 for (i = 0; is_assignment(argv[i]); i++) {
Denis Vlasenkoc666f712007-05-16 22:18:54 +00001342 debug_printf_exec("pid %d environment modification: %s\n",
Denis Vlasenko1359da62007-04-21 23:27:30 +00001343 getpid(), argv[i]);
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00001344// FIXME: vfork case??
Denis Vlasenko170435c2007-05-23 13:01:10 +00001345 p = expand_string_to_string(argv[i]);
1346 putenv(p);
Denis Vlasenko1359da62007-04-21 23:27:30 +00001347 }
1348 argv += i;
1349 /* If a variable is assigned in a forest, and nobody listens,
1350 * was it ever really set?
1351 */
1352 if (argv[0] == NULL) {
1353 _exit(EXIT_SUCCESS);
1354 }
Denis Vlasenko87cb2db2007-04-21 10:00:01 +00001355
Denis Vlasenko170435c2007-05-23 13:01:10 +00001356 argv = expand_strvec_to_strvec(argv);
Denis Vlasenko764d59d2007-05-14 16:23:23 +00001357
Denis Vlasenko1359da62007-04-21 23:27:30 +00001358 /*
1359 * Check if the command matches any of the builtins.
1360 * Depending on context, this might be redundant. But it's
1361 * easier to waste a few CPU cycles than it is to figure out
1362 * if this is one of those cases.
1363 */
1364 for (x = bltins; x->cmd; x++) {
1365 if (strcmp(argv[0], x->cmd) == 0) {
Denis Vlasenko764d59d2007-05-14 16:23:23 +00001366 debug_printf_exec("running builtin '%s'\n", argv[0]);
Denis Vlasenko1359da62007-04-21 23:27:30 +00001367 rcode = x->function(argv);
1368 fflush(stdout);
1369 _exit(rcode);
Eric Andersen94ac2442001-05-22 19:05:18 +00001370 }
Denis Vlasenko1359da62007-04-21 23:27:30 +00001371 }
Eric Andersen78a7c992001-05-15 16:30:25 +00001372
Denis Vlasenkoc666f712007-05-16 22:18:54 +00001373 /* Check if the command matches any busybox applets */
Denis Vlasenko80d14be2007-04-10 23:03:30 +00001374#if ENABLE_FEATURE_SH_STANDALONE
Denis Vlasenkoc666f712007-05-16 22:18:54 +00001375 if (strchr(argv[0], '/') == NULL) {
1376 const struct bb_applet *a = find_applet_by_name(argv[0]);
1377 if (a) {
1378 if (a->noexec) {
1379 current_applet = a;
1380 debug_printf_exec("running applet '%s'\n", argv[0]);
1381// is it ok that run_current_applet_and_exit() does exit(), not _exit()?
1382 run_current_applet_and_exit(argv);
1383 }
1384 /* re-exec ourselves with the new arguments */
1385 debug_printf_exec("re-execing applet '%s'\n", argv[0]);
Denis Vlasenkobdbbb7e2007-06-08 15:02:55 +00001386 execvp(bb_busybox_exec_path, argv);
Denis Vlasenkoc666f712007-05-16 22:18:54 +00001387 /* If they called chroot or otherwise made the binary no longer
1388 * executable, fall through */
1389 }
1390 }
Eric Andersenaac75e52001-04-30 18:18:45 +00001391#endif
Denis Vlasenkoc666f712007-05-16 22:18:54 +00001392
1393 debug_printf_exec("execing '%s'\n", argv[0]);
Denis Vlasenko1359da62007-04-21 23:27:30 +00001394 execvp(argv[0], argv);
1395 bb_perror_msg("cannot exec '%s'", argv[0]);
1396 _exit(1);
1397}
1398
1399static void pseudo_exec(struct child_prog *child)
1400{
Denis Vlasenkof2fffd02007-05-02 23:39:04 +00001401// FIXME: buggy wrt NOMMU! Must not modify any global data
1402// until it does exec/_exit, but currently it does.
Denis Vlasenko1359da62007-04-21 23:27:30 +00001403 int rcode;
1404
1405 if (child->argv) {
1406 pseudo_exec_argv(child->argv);
Denis Vlasenkof03dbed2007-04-13 19:55:50 +00001407 }
1408
1409 if (child->group) {
Denis Vlasenko87cb2db2007-04-21 10:00:01 +00001410 // FIXME: do not modify globals! Think vfork!
Denis Vlasenkob81b3df2007-04-28 16:48:04 +00001411#if ENABLE_HUSH_INTERACTIVE
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00001412 debug_printf_exec("pseudo_exec: setting interactive_fd=0\n");
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00001413 interactive_fd = 0; /* crucial!!!! */
Denis Vlasenkob81b3df2007-04-28 16:48:04 +00001414#endif
Denis Vlasenkod01ff132007-05-02 21:40:23 +00001415 debug_printf_exec("pseudo_exec: run_list_real\n");
Eric Andersen25f27032001-04-26 23:22:31 +00001416 rcode = run_list_real(child->group);
Eric Andersenbf7df042001-05-23 22:18:35 +00001417 /* OK to leak memory by not calling free_pipe_list,
Eric Andersen25f27032001-04-26 23:22:31 +00001418 * since this process is about to exit */
Eric Andersen94ac2442001-05-22 19:05:18 +00001419 _exit(rcode);
Eric Andersen25f27032001-04-26 23:22:31 +00001420 }
Denis Vlasenkof03dbed2007-04-13 19:55:50 +00001421
1422 /* Can happen. See what bash does with ">foo" by itself. */
1423 debug_printf("trying to pseudo_exec null command\n");
1424 _exit(EXIT_SUCCESS);
Eric Andersen25f27032001-04-26 23:22:31 +00001425}
1426
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00001427#if ENABLE_HUSH_JOB
Denis Vlasenko3ac0e002007-04-28 16:45:22 +00001428static const char *get_cmdtext(struct pipe *pi)
1429{
1430 char **argv;
1431 char *p;
1432 int len;
1433
1434 /* This is subtle. ->cmdtext is created only on first backgrounding.
1435 * (Think "cat, <ctrl-z>, fg, <ctrl-z>, fg, <ctrl-z>...." here...)
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00001436 * On subsequent bg argv is trashed, but we won't use it */
Denis Vlasenko3ac0e002007-04-28 16:45:22 +00001437 if (pi->cmdtext)
1438 return pi->cmdtext;
1439 argv = pi->progs[0].argv;
1440 if (!argv || !argv[0])
1441 return (pi->cmdtext = xzalloc(1));
1442
1443 len = 0;
1444 do len += strlen(*argv) + 1; while (*++argv);
1445 pi->cmdtext = p = xmalloc(len);
1446 argv = pi->progs[0].argv;
1447 do {
1448 len = strlen(*argv);
1449 memcpy(p, *argv, len);
1450 p += len;
1451 *p++ = ' ';
1452 } while (*++argv);
1453 p[-1] = '\0';
1454 return pi->cmdtext;
1455}
1456
Eric Andersenbafd94f2001-05-02 16:11:59 +00001457static void insert_bg_job(struct pipe *pi)
1458{
1459 struct pipe *thejob;
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00001460 int i;
Eric Andersenbafd94f2001-05-02 16:11:59 +00001461
1462 /* Linear search for the ID of the job to use */
1463 pi->jobid = 1;
Eric Andersenc798b072001-06-22 06:23:03 +00001464 for (thejob = job_list; thejob; thejob = thejob->next)
Eric Andersenbafd94f2001-05-02 16:11:59 +00001465 if (thejob->jobid >= pi->jobid)
1466 pi->jobid = thejob->jobid + 1;
1467
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00001468 /* Add thejob to the list of running jobs */
Eric Andersenc798b072001-06-22 06:23:03 +00001469 if (!job_list) {
Eric Andersen52a97ca2001-06-22 06:49:26 +00001470 thejob = job_list = xmalloc(sizeof(*thejob));
Eric Andersenbafd94f2001-05-02 16:11:59 +00001471 } else {
Denis Vlasenko0c886c62007-01-30 22:30:09 +00001472 for (thejob = job_list; thejob->next; thejob = thejob->next)
Denis Vlasenkof03dbed2007-04-13 19:55:50 +00001473 continue;
Eric Andersenbafd94f2001-05-02 16:11:59 +00001474 thejob->next = xmalloc(sizeof(*thejob));
1475 thejob = thejob->next;
1476 }
1477
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00001478 /* Physically copy the struct job */
Eric Andersen0fcd4472001-05-02 20:12:03 +00001479 memcpy(thejob, pi, sizeof(struct pipe));
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00001480 thejob->progs = xzalloc(sizeof(pi->progs[0]) * pi->num_progs);
1481 /* We cannot copy entire pi->progs[] vector! Double free()s will happen */
1482 for (i = 0; i < pi->num_progs; i++) {
1483// TODO: do we really need to have so many fields which are just dead weight
1484// at execution stage?
1485 thejob->progs[i].pid = pi->progs[i].pid;
Denis Vlasenkoc666f712007-05-16 22:18:54 +00001486 /* all other fields are not used and stay zero */
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00001487 }
Eric Andersenbafd94f2001-05-02 16:11:59 +00001488 thejob->next = NULL;
Denis Vlasenko3ac0e002007-04-28 16:45:22 +00001489 thejob->cmdtext = xstrdup(get_cmdtext(pi));
Eric Andersenbafd94f2001-05-02 16:11:59 +00001490
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00001491 /* We don't wait for background thejobs to return -- append it
Eric Andersenbafd94f2001-05-02 16:11:59 +00001492 to the list of backgrounded thejobs and leave it alone */
Denis Vlasenko3ac0e002007-04-28 16:45:22 +00001493 printf("[%d] %d %s\n", thejob->jobid, thejob->progs[0].pid, thejob->cmdtext);
Eric Andersen1a6d39b2001-05-08 05:11:54 +00001494 last_bg_pid = thejob->progs[0].pid;
Eric Andersenc798b072001-06-22 06:23:03 +00001495 last_jobid = thejob->jobid;
Eric Andersenbafd94f2001-05-02 16:11:59 +00001496}
1497
Eric Andersenbafd94f2001-05-02 16:11:59 +00001498static void remove_bg_job(struct pipe *pi)
1499{
1500 struct pipe *prev_pipe;
1501
Eric Andersenc798b072001-06-22 06:23:03 +00001502 if (pi == job_list) {
Eric Andersen52a97ca2001-06-22 06:49:26 +00001503 job_list = pi->next;
Eric Andersenbafd94f2001-05-02 16:11:59 +00001504 } else {
Eric Andersenc798b072001-06-22 06:23:03 +00001505 prev_pipe = job_list;
Eric Andersenbafd94f2001-05-02 16:11:59 +00001506 while (prev_pipe->next != pi)
1507 prev_pipe = prev_pipe->next;
1508 prev_pipe->next = pi->next;
1509 }
Eric Andersen028b65b2001-06-28 01:10:11 +00001510 if (job_list)
1511 last_jobid = job_list->jobid;
1512 else
1513 last_jobid = 0;
Denis Vlasenko1359da62007-04-21 23:27:30 +00001514}
Eric Andersen028b65b2001-06-28 01:10:11 +00001515
Denis Vlasenko1359da62007-04-21 23:27:30 +00001516/* remove a backgrounded job */
1517static void delete_finished_bg_job(struct pipe *pi)
1518{
1519 remove_bg_job(pi);
Eric Andersen52a97ca2001-06-22 06:49:26 +00001520 pi->stopped_progs = 0;
Eric Andersenbf7df042001-05-23 22:18:35 +00001521 free_pipe(pi, 0);
Eric Andersenbafd94f2001-05-02 16:11:59 +00001522 free(pi);
1523}
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00001524#endif /* JOB */
Eric Andersenbafd94f2001-05-02 16:11:59 +00001525
Eric Andersenc7bda1c2004-03-15 08:29:22 +00001526/* Checks to see if any processes have exited -- if they
Eric Andersenbafd94f2001-05-02 16:11:59 +00001527 have, figure out why and see if a job has completed */
Eric Andersenc798b072001-06-22 06:23:03 +00001528static int checkjobs(struct pipe* fg_pipe)
Eric Andersenbafd94f2001-05-02 16:11:59 +00001529{
Eric Andersenc798b072001-06-22 06:23:03 +00001530 int attributes;
1531 int status;
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00001532#if ENABLE_HUSH_JOB
Eric Andersenbafd94f2001-05-02 16:11:59 +00001533 int prognum = 0;
1534 struct pipe *pi;
Denis Vlasenkob81b3df2007-04-28 16:48:04 +00001535#endif
Eric Andersenbafd94f2001-05-02 16:11:59 +00001536 pid_t childpid;
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00001537 int rcode = 0;
Eric Andersenbafd94f2001-05-02 16:11:59 +00001538
Eric Andersenc798b072001-06-22 06:23:03 +00001539 attributes = WUNTRACED;
Denis Vlasenko0c886c62007-01-30 22:30:09 +00001540 if (fg_pipe == NULL) {
Eric Andersenc798b072001-06-22 06:23:03 +00001541 attributes |= WNOHANG;
1542 }
1543
Denis Vlasenko1359da62007-04-21 23:27:30 +00001544/* Do we do this right?
1545 * bash-3.00# sleep 20 | false
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00001546 * <ctrl-Z pressed>
Denis Vlasenko1359da62007-04-21 23:27:30 +00001547 * [3]+ Stopped sleep 20 | false
1548 * bash-3.00# echo $?
1549 * 1 <========== bg pipe is not fully done, but exitcode is already known!
1550 */
1551
Denis Vlasenkob81b3df2007-04-28 16:48:04 +00001552//FIXME: non-interactive bash does not continue even if all processes in fg pipe
1553//are stopped. Testcase: "cat | cat" in a script (not on command line)
1554// + killall -STOP cat
1555
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00001556 wait_more:
Eric Andersenc798b072001-06-22 06:23:03 +00001557 while ((childpid = waitpid(-1, &status, attributes)) > 0) {
Denis Vlasenko1359da62007-04-21 23:27:30 +00001558 const int dead = WIFEXITED(status) || WIFSIGNALED(status);
1559
1560#ifdef DEBUG_SHELL_JOBS
1561 if (WIFSTOPPED(status))
Denis Vlasenkod01ff132007-05-02 21:40:23 +00001562 debug_printf_jobs("pid %d stopped by sig %d (exitcode %d)\n",
Denis Vlasenko1359da62007-04-21 23:27:30 +00001563 childpid, WSTOPSIG(status), WEXITSTATUS(status));
1564 if (WIFSIGNALED(status))
Denis Vlasenkod01ff132007-05-02 21:40:23 +00001565 debug_printf_jobs("pid %d killed by sig %d (exitcode %d)\n",
Denis Vlasenko1359da62007-04-21 23:27:30 +00001566 childpid, WTERMSIG(status), WEXITSTATUS(status));
1567 if (WIFEXITED(status))
Denis Vlasenkod01ff132007-05-02 21:40:23 +00001568 debug_printf_jobs("pid %d exited, exitcode %d\n",
Denis Vlasenko1359da62007-04-21 23:27:30 +00001569 childpid, WEXITSTATUS(status));
1570#endif
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00001571 /* Were we asked to wait for fg pipe? */
Eric Andersenc798b072001-06-22 06:23:03 +00001572 if (fg_pipe) {
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00001573 int i;
Denis Vlasenko0c886c62007-01-30 22:30:09 +00001574 for (i = 0; i < fg_pipe->num_progs; i++) {
Denis Vlasenkod01ff132007-05-02 21:40:23 +00001575 debug_printf_jobs("check pid %d\n", fg_pipe->progs[i].pid);
Eric Andersenc798b072001-06-22 06:23:03 +00001576 if (fg_pipe->progs[i].pid == childpid) {
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00001577 /* printf("process %d exit %d\n", i, WEXITSTATUS(status)); */
Denis Vlasenko1359da62007-04-21 23:27:30 +00001578 if (dead) {
1579 fg_pipe->progs[i].pid = 0;
1580 fg_pipe->running_progs--;
1581 if (i == fg_pipe->num_progs-1)
1582 /* last process gives overall exitstatus */
1583 rcode = WEXITSTATUS(status);
1584 } else {
1585 fg_pipe->progs[i].is_stopped = 1;
1586 fg_pipe->stopped_progs++;
1587 }
Denis Vlasenkod01ff132007-05-02 21:40:23 +00001588 debug_printf_jobs("fg_pipe: running_progs %d stopped_progs %d\n",
Denis Vlasenko1359da62007-04-21 23:27:30 +00001589 fg_pipe->running_progs, fg_pipe->stopped_progs);
1590 if (fg_pipe->running_progs - fg_pipe->stopped_progs <= 0) {
1591 /* All processes in fg pipe have exited/stopped */
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00001592#if ENABLE_HUSH_JOB
Denis Vlasenko1359da62007-04-21 23:27:30 +00001593 if (fg_pipe->running_progs)
1594 insert_bg_job(fg_pipe);
Denis Vlasenkob81b3df2007-04-28 16:48:04 +00001595#endif
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00001596 return rcode;
Denis Vlasenko1359da62007-04-21 23:27:30 +00001597 }
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00001598 /* There are still running processes in the fg pipe */
1599 goto wait_more;
Eric Andersenc798b072001-06-22 06:23:03 +00001600 }
1601 }
Denis Vlasenko1359da62007-04-21 23:27:30 +00001602 /* fall through to searching process in bg pipes */
Eric Andersenc798b072001-06-22 06:23:03 +00001603 }
1604
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00001605#if ENABLE_HUSH_JOB
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00001606 /* We asked to wait for bg or orphaned children */
1607 /* No need to remember exitcode in this case */
Eric Andersenc798b072001-06-22 06:23:03 +00001608 for (pi = job_list; pi; pi = pi->next) {
Eric Andersenbafd94f2001-05-02 16:11:59 +00001609 prognum = 0;
Denis Vlasenko5f786c22007-04-20 08:35:45 +00001610 while (prognum < pi->num_progs) {
1611 if (pi->progs[prognum].pid == childpid)
1612 goto found_pi_and_prognum;
Eric Andersen52a97ca2001-06-22 06:49:26 +00001613 prognum++;
1614 }
Eric Andersenbafd94f2001-05-02 16:11:59 +00001615 }
Denis Vlasenkob81b3df2007-04-28 16:48:04 +00001616#endif
Eric Andersenbafd94f2001-05-02 16:11:59 +00001617
Denis Vlasenko5f786c22007-04-20 08:35:45 +00001618 /* Happens when shell is used as init process (init=/bin/sh) */
1619 debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
Denis Vlasenko1359da62007-04-21 23:27:30 +00001620 goto wait_more;
Eric Andersenaeb44c42001-05-22 20:29:00 +00001621
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00001622#if ENABLE_HUSH_JOB
Denis Vlasenko5f786c22007-04-20 08:35:45 +00001623 found_pi_and_prognum:
Denis Vlasenko1359da62007-04-21 23:27:30 +00001624 if (dead) {
Eric Andersenbafd94f2001-05-02 16:11:59 +00001625 /* child exited */
Eric Andersenbafd94f2001-05-02 16:11:59 +00001626 pi->progs[prognum].pid = 0;
Denis Vlasenko1359da62007-04-21 23:27:30 +00001627 pi->running_progs--;
Eric Andersenbafd94f2001-05-02 16:11:59 +00001628 if (!pi->running_progs) {
Denis Vlasenko0c886c62007-01-30 22:30:09 +00001629 printf(JOB_STATUS_FORMAT, pi->jobid,
Denis Vlasenko3ac0e002007-04-28 16:45:22 +00001630 "Done", pi->cmdtext);
Denis Vlasenko1359da62007-04-21 23:27:30 +00001631 delete_finished_bg_job(pi);
Eric Andersenbafd94f2001-05-02 16:11:59 +00001632 }
1633 } else {
1634 /* child stopped */
1635 pi->stopped_progs++;
1636 pi->progs[prognum].is_stopped = 1;
Eric Andersenbafd94f2001-05-02 16:11:59 +00001637 }
Denis Vlasenkob81b3df2007-04-28 16:48:04 +00001638#endif
Eric Andersenbafd94f2001-05-02 16:11:59 +00001639 }
1640
Denis Vlasenko1359da62007-04-21 23:27:30 +00001641 /* wait found no children or failed */
1642
1643 if (childpid && errno != ECHILD)
Manuel Novoa III cad53642003-03-19 09:13:01 +00001644 bb_perror_msg("waitpid");
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00001645 return rcode;
Eric Andersenada18ff2001-05-21 16:18:22 +00001646}
1647
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00001648#if ENABLE_HUSH_JOB
Denis Vlasenko52881e92007-04-21 13:42:52 +00001649static int checkjobs_and_fg_shell(struct pipe* fg_pipe)
1650{
1651 pid_t p;
1652 int rcode = checkjobs(fg_pipe);
1653 /* Job finished, move the shell to the foreground */
Denis Vlasenko170435c2007-05-23 13:01:10 +00001654 p = getpgid(0); /* pgid of our process */
1655 debug_printf_jobs("fg'ing ourself: getpgid(0)=%d\n", (int)p);
Denis Vlasenko52881e92007-04-21 13:42:52 +00001656 if (tcsetpgrp(interactive_fd, p) && errno != ENOTTY)
1657 bb_perror_msg("tcsetpgrp-4a");
1658 return rcode;
1659}
Denis Vlasenkob81b3df2007-04-28 16:48:04 +00001660#endif
Denis Vlasenko52881e92007-04-21 13:42:52 +00001661
Eric Andersen25f27032001-04-26 23:22:31 +00001662/* run_pipe_real() starts all the jobs, but doesn't wait for anything
Eric Andersenc798b072001-06-22 06:23:03 +00001663 * to finish. See checkjobs().
Eric Andersen25f27032001-04-26 23:22:31 +00001664 *
1665 * return code is normally -1, when the caller has to wait for children
1666 * to finish to determine the exit status of the pipe. If the pipe
1667 * is a simple builtin command, however, the action is done by the
1668 * time run_pipe_real returns, and the exit code is provided as the
1669 * return value.
1670 *
1671 * The input of the pipe is always stdin, the output is always
1672 * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus,
1673 * because it tries to avoid running the command substitution in
1674 * subshell, when that is in fact necessary. The subshell process
1675 * now has its stdout directed to the input of the appropriate pipe,
1676 * so this routine is noticeably simpler.
Denis Vlasenko170435c2007-05-23 13:01:10 +00001677 *
1678 * Returns -1 only if started some children. IOW: we have to
1679 * mask out retvals of builtins etc with 0xff!
Eric Andersen25f27032001-04-26 23:22:31 +00001680 */
1681static int run_pipe_real(struct pipe *pi)
1682{
1683 int i;
1684 int nextin, nextout;
1685 int pipefds[2]; /* pipefds[0] is for reading */
Rob Landley53702e52006-07-19 21:43:53 +00001686 struct child_prog *child;
"Vladimir N. Oleynik"485d7cb2005-10-17 09:48:57 +00001687 const struct built_in_command *x;
Eric Andersen4c9b68f2002-04-13 12:33:41 +00001688 char *p;
Denis Vlasenkof5294e12007-04-14 10:09:57 +00001689 /* it is not always needed, but we aim to smaller code */
1690 int squirrel[] = { -1, -1, -1 };
1691 int rcode;
Denis Vlasenko52881e92007-04-21 13:42:52 +00001692 const int single_fg = (pi->num_progs == 1 && pi->followup != PIPE_BG);
Eric Andersen25f27032001-04-26 23:22:31 +00001693
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00001694 debug_printf_exec("run_pipe_real start: single_fg=%d\n", single_fg);
Denis Vlasenko4ac530c2007-05-02 15:35:45 +00001695
Eric Andersen25f27032001-04-26 23:22:31 +00001696 nextin = 0;
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00001697#if ENABLE_HUSH_JOB
Eric Andersenada18ff2001-05-21 16:18:22 +00001698 pi->pgrp = -1;
Denis Vlasenkob81b3df2007-04-28 16:48:04 +00001699#endif
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00001700 pi->running_progs = 1;
Denis Vlasenko1359da62007-04-21 23:27:30 +00001701 pi->stopped_progs = 0;
Eric Andersen25f27032001-04-26 23:22:31 +00001702
1703 /* Check if this is a simple builtin (not part of a pipe).
1704 * Builtins within pipes have to fork anyway, and are handled in
1705 * pseudo_exec. "echo foo | read bar" doesn't work on bash, either.
1706 */
Denis Vlasenko0c886c62007-01-30 22:30:09 +00001707 child = &(pi->progs[0]);
Denis Vlasenko52881e92007-04-21 13:42:52 +00001708 if (single_fg && child->group && child->subshell == 0) {
Eric Andersen04407e52001-06-07 16:42:05 +00001709 debug_printf("non-subshell grouping\n");
1710 setup_redirects(child, squirrel);
Denis Vlasenkod01ff132007-05-02 21:40:23 +00001711 debug_printf_exec(": run_list_real\n");
Eric Andersen04407e52001-06-07 16:42:05 +00001712 rcode = run_list_real(child->group);
1713 restore_redirects(squirrel);
Denis Vlasenkod01ff132007-05-02 21:40:23 +00001714 debug_printf_exec("run_pipe_real return %d\n", rcode);
Denis Vlasenko170435c2007-05-23 13:01:10 +00001715 return rcode; // do we need to add '... & 0xff' ?
Denis Vlasenkof03dbed2007-04-13 19:55:50 +00001716 }
1717
Denis Vlasenko1359da62007-04-21 23:27:30 +00001718 if (single_fg && child->argv != NULL) {
Denis Vlasenkoc666f712007-05-16 22:18:54 +00001719 char **argv_expanded;
Denis Vlasenko1359da62007-04-21 23:27:30 +00001720 char **argv = child->argv;
1721
1722 for (i = 0; is_assignment(argv[i]); i++)
Denis Vlasenkof03dbed2007-04-13 19:55:50 +00001723 continue;
Denis Vlasenko1359da62007-04-21 23:27:30 +00001724 if (i != 0 && argv[i] == NULL) {
Eric Andersen78a7c992001-05-15 16:30:25 +00001725 /* assignments, but no command: set the local environment */
Denis Vlasenko1359da62007-04-21 23:27:30 +00001726 for (i = 0; argv[i] != NULL; i++) {
Denis Vlasenkod76c0492007-05-25 02:16:25 +00001727 debug_printf("local environment set: %s\n", argv[i]);
Denis Vlasenko170435c2007-05-23 13:01:10 +00001728 p = expand_string_to_string(argv[i]);
Denis Vlasenkod76c0492007-05-25 02:16:25 +00001729 set_local_var(p, 0);
Eric Andersen78a7c992001-05-15 16:30:25 +00001730 }
1731 return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */
1732 }
Denis Vlasenko1359da62007-04-21 23:27:30 +00001733 for (i = 0; is_assignment(argv[i]); i++) {
Denis Vlasenko170435c2007-05-23 13:01:10 +00001734 p = expand_string_to_string(argv[i]);
1735 //sp: child->sp--;
1736 putenv(p);
Eric Andersen4c9b68f2002-04-13 12:33:41 +00001737 }
Eric Andersen25f27032001-04-26 23:22:31 +00001738 for (x = bltins; x->cmd; x++) {
Denis Vlasenko1359da62007-04-21 23:27:30 +00001739 if (strcmp(argv[i], x->cmd) == 0) {
1740 if (x->function == builtin_exec && argv[i+1] == NULL) {
Eric Andersen83a2ae22001-05-07 17:59:25 +00001741 debug_printf("magic exec\n");
Denis Vlasenkof03dbed2007-04-13 19:55:50 +00001742 setup_redirects(child, NULL);
Eric Andersen83a2ae22001-05-07 17:59:25 +00001743 return EXIT_SUCCESS;
1744 }
Denis Vlasenko1359da62007-04-21 23:27:30 +00001745 debug_printf("builtin inline %s\n", argv[0]);
Eric Andersen25f27032001-04-26 23:22:31 +00001746 /* XXX setup_redirects acts on file descriptors, not FILEs.
1747 * This is perfect for work that comes after exec().
1748 * Is it really safe for inline use? Experimentally,
1749 * things seem to work with glibc. */
1750 setup_redirects(child, squirrel);
Denis Vlasenkod01ff132007-05-02 21:40:23 +00001751 debug_printf_exec(": builtin '%s' '%s'...\n", x->cmd, argv[i+1]);
Denis Vlasenkoc666f712007-05-16 22:18:54 +00001752 //sp: if (child->sp) /* btw we can do it unconditionally... */
Denis Vlasenko170435c2007-05-23 13:01:10 +00001753 argv_expanded = expand_strvec_to_strvec(argv + i);
1754 rcode = x->function(argv_expanded) & 0xff;
Denis Vlasenkoc666f712007-05-16 22:18:54 +00001755 free(argv_expanded);
Eric Andersen25f27032001-04-26 23:22:31 +00001756 restore_redirects(squirrel);
Denis Vlasenkod01ff132007-05-02 21:40:23 +00001757 debug_printf_exec("run_pipe_real return %d\n", rcode);
Eric Andersen25f27032001-04-26 23:22:31 +00001758 return rcode;
1759 }
1760 }
Denis Vlasenkof5294e12007-04-14 10:09:57 +00001761#if ENABLE_FEATURE_SH_STANDALONE
1762 {
Denis Vlasenko1359da62007-04-21 23:27:30 +00001763 const struct bb_applet *a = find_applet_by_name(argv[i]);
Denis Vlasenkof5294e12007-04-14 10:09:57 +00001764 if (a && a->nofork) {
1765 setup_redirects(child, squirrel);
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00001766 save_nofork_data(&nofork_save);
Denis Vlasenko764d59d2007-05-14 16:23:23 +00001767 argv_expanded = argv + i;
Denis Vlasenkoc666f712007-05-16 22:18:54 +00001768 //sp: if (child->sp)
Denis Vlasenko170435c2007-05-23 13:01:10 +00001769 argv_expanded = expand_strvec_to_strvec(argv + i);
Denis Vlasenko764d59d2007-05-14 16:23:23 +00001770 debug_printf_exec(": run_nofork_applet '%s' '%s'...\n", argv_expanded[0], argv_expanded[1]);
Denis Vlasenko170435c2007-05-23 13:01:10 +00001771 rcode = run_nofork_applet_prime(&nofork_save, a, argv_expanded) & 0xff;
Denis Vlasenkoc666f712007-05-16 22:18:54 +00001772 free(argv_expanded);
Denis Vlasenko3ac0e002007-04-28 16:45:22 +00001773 restore_redirects(squirrel);
Denis Vlasenkod01ff132007-05-02 21:40:23 +00001774 debug_printf_exec("run_pipe_real return %d\n", rcode);
Denis Vlasenko3ac0e002007-04-28 16:45:22 +00001775 return rcode;
Denis Vlasenkof5294e12007-04-14 10:09:57 +00001776 }
1777 }
1778#endif
Eric Andersen25f27032001-04-26 23:22:31 +00001779 }
1780
Denis Vlasenko3ac0e002007-04-28 16:45:22 +00001781 /* Going to fork a child per each pipe member */
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00001782 pi->running_progs = 0;
Denis Vlasenko3ac0e002007-04-28 16:45:22 +00001783
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00001784 /* Disable job control signals for shell (parent) and
1785 * for initial child code after fork */
1786 set_jobctrl_sighandler(SIG_IGN);
1787
Eric Andersen25f27032001-04-26 23:22:31 +00001788 for (i = 0; i < pi->num_progs; i++) {
Denis Vlasenko0c886c62007-01-30 22:30:09 +00001789 child = &(pi->progs[i]);
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00001790 if (child->argv)
1791 debug_printf_exec(": pipe member '%s' '%s'...\n", child->argv[0], child->argv[1]);
1792 else
1793 debug_printf_exec(": pipe member with no argv\n");
Eric Andersen25f27032001-04-26 23:22:31 +00001794
1795 /* pipes are inserted between pairs of commands */
1796 if ((i + 1) < pi->num_progs) {
Denis Vlasenko5a6aedd2007-05-26 16:44:20 +00001797 pipe(pipefds);
Eric Andersen25f27032001-04-26 23:22:31 +00001798 nextout = pipefds[1];
1799 } else {
Denis Vlasenko0c886c62007-01-30 22:30:09 +00001800 nextout = 1;
Eric Andersen25f27032001-04-26 23:22:31 +00001801 pipefds[0] = -1;
1802 }
1803
1804 /* XXX test for failed fork()? */
Denis Vlasenkof03dbed2007-04-13 19:55:50 +00001805#if BB_MMU
Denis Vlasenko0c886c62007-01-30 22:30:09 +00001806 child->pid = fork();
Eric Andersen72f9a422001-10-28 05:12:20 +00001807#else
Denis Vlasenko0c886c62007-01-30 22:30:09 +00001808 child->pid = vfork();
Eric Andersen72f9a422001-10-28 05:12:20 +00001809#endif
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00001810 if (!child->pid) { /* child */
1811 /* Every child adds itself to new process group
1812 * with pgid == pid of first child in pipe */
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00001813#if ENABLE_HUSH_JOB
Denis Vlasenko170435c2007-05-23 13:01:10 +00001814 if (run_list_level == 1 && interactive_fd) {
Denis Vlasenko3ac0e002007-04-28 16:45:22 +00001815 /* Don't do pgrp restore anymore on fatal signals */
1816 set_fatal_sighandler(SIG_DFL);
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00001817 if (pi->pgrp < 0) /* true for 1st process only */
1818 pi->pgrp = getpid();
1819 if (setpgid(0, pi->pgrp) == 0 && pi->followup != PIPE_BG) {
1820 /* We do it in *every* child, not just first,
1821 * to avoid races */
1822 tcsetpgrp(interactive_fd, pi->pgrp);
1823 }
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00001824 }
Denis Vlasenkob81b3df2007-04-28 16:48:04 +00001825#endif
Denis Vlasenkoc666f712007-05-16 22:18:54 +00001826 /* in non-interactive case fatal sigs are already SIG_DFL */
Eric Andersen25f27032001-04-26 23:22:31 +00001827 close_all();
Eric Andersen25f27032001-04-26 23:22:31 +00001828 if (nextin != 0) {
1829 dup2(nextin, 0);
1830 close(nextin);
1831 }
1832 if (nextout != 1) {
1833 dup2(nextout, 1);
1834 close(nextout);
1835 }
Denis Vlasenkobb81c582007-01-30 22:32:09 +00001836 if (pipefds[0] != -1) {
Eric Andersen25f27032001-04-26 23:22:31 +00001837 close(pipefds[0]); /* opposite end of our output pipe */
1838 }
Eric Andersen25f27032001-04-26 23:22:31 +00001839 /* Like bash, explicit redirects override pipes,
1840 * and the pipe fd is available for dup'ing. */
Denis Vlasenkof03dbed2007-04-13 19:55:50 +00001841 setup_redirects(child, NULL);
Eric Andersen52a97ca2001-06-22 06:49:26 +00001842
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00001843 /* Restore default handlers just prior to exec */
1844 set_jobctrl_sighandler(SIG_DFL);
1845 set_misc_sighandler(SIG_DFL);
1846 signal(SIGCHLD, SIG_DFL);
Eric Andersen25f27032001-04-26 23:22:31 +00001847 pseudo_exec(child);
1848 }
Eric Andersenc7bda1c2004-03-15 08:29:22 +00001849
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00001850 pi->running_progs++;
1851
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00001852#if ENABLE_HUSH_JOB
Denis Vlasenko2f1bb362007-04-21 10:01:14 +00001853 /* Second and next children need to know pid of first one */
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00001854 if (pi->pgrp < 0)
Eric Andersen0fcd4472001-05-02 20:12:03 +00001855 pi->pgrp = child->pid;
Denis Vlasenkob81b3df2007-04-28 16:48:04 +00001856#endif
Eric Andersen25f27032001-04-26 23:22:31 +00001857 if (nextin != 0)
1858 close(nextin);
1859 if (nextout != 1)
1860 close(nextout);
1861
Eric Andersenc7bda1c2004-03-15 08:29:22 +00001862 /* If there isn't another process, nextin is garbage
Eric Andersen25f27032001-04-26 23:22:31 +00001863 but it doesn't matter */
1864 nextin = pipefds[0];
1865 }
Denis Vlasenkod01ff132007-05-02 21:40:23 +00001866 debug_printf_exec("run_pipe_real return -1\n");
Eric Andersen25f27032001-04-26 23:22:31 +00001867 return -1;
1868}
1869
Denis Vlasenko4b924f32007-05-30 00:29:55 +00001870#ifndef debug_print_tree
Denis Vlasenko400c5b62007-05-04 13:07:27 +00001871static void debug_print_tree(struct pipe *pi, int lvl)
1872{
1873 static const char *PIPE[] = {
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00001874 [PIPE_SEQ] = "SEQ",
1875 [PIPE_AND] = "AND",
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00001876 [PIPE_OR ] = "OR" ,
1877 [PIPE_BG ] = "BG" ,
Denis Vlasenko400c5b62007-05-04 13:07:27 +00001878 };
1879 static const char *RES[] = {
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00001880 [RES_NONE ] = "NONE" ,
Denis Vlasenko06810332007-05-21 23:30:54 +00001881#if ENABLE_HUSH_IF
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00001882 [RES_IF ] = "IF" ,
1883 [RES_THEN ] = "THEN" ,
1884 [RES_ELIF ] = "ELIF" ,
1885 [RES_ELSE ] = "ELSE" ,
1886 [RES_FI ] = "FI" ,
Denis Vlasenko06810332007-05-21 23:30:54 +00001887#endif
1888#if ENABLE_HUSH_LOOPS
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00001889 [RES_FOR ] = "FOR" ,
1890 [RES_WHILE] = "WHILE",
1891 [RES_UNTIL] = "UNTIL",
1892 [RES_DO ] = "DO" ,
1893 [RES_DONE ] = "DONE" ,
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00001894 [RES_IN ] = "IN" ,
Denis Vlasenko06810332007-05-21 23:30:54 +00001895#endif
1896 [RES_XXXX ] = "XXXX" ,
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00001897 [RES_SNTX ] = "SNTX" ,
Denis Vlasenko400c5b62007-05-04 13:07:27 +00001898 };
1899
1900 int pin, prn;
Denis Vlasenko219e88d2007-05-21 10:18:23 +00001901
Denis Vlasenko400c5b62007-05-04 13:07:27 +00001902 pin = 0;
1903 while (pi) {
Denis Vlasenko219e88d2007-05-21 10:18:23 +00001904 fprintf(stderr, "%*spipe %d res_word=%s followup=%d %s\n", lvl*2, "",
1905 pin, RES[pi->res_word], pi->followup, PIPE[pi->followup]);
Denis Vlasenko400c5b62007-05-04 13:07:27 +00001906 prn = 0;
1907 while (prn < pi->num_progs) {
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00001908 struct child_prog *child = &pi->progs[prn];
1909 char **argv = child->argv;
1910
Denis Vlasenko400c5b62007-05-04 13:07:27 +00001911 fprintf(stderr, "%*s prog %d", lvl*2, "", prn);
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00001912 if (child->group) {
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00001913 fprintf(stderr, " group %s: (argv=%p)\n",
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00001914 (child->subshell ? "()" : "{}"),
1915 argv);
1916 debug_print_tree(child->group, lvl+1);
Denis Vlasenko400c5b62007-05-04 13:07:27 +00001917 prn++;
1918 continue;
1919 }
Denis Vlasenko400c5b62007-05-04 13:07:27 +00001920 if (argv) while (*argv) {
1921 fprintf(stderr, " '%s'", *argv);
1922 argv++;
Denis Vlasenko4b924f32007-05-30 00:29:55 +00001923 }
Denis Vlasenko400c5b62007-05-04 13:07:27 +00001924 fprintf(stderr, "\n");
1925 prn++;
1926 }
1927 pi = pi->next;
1928 pin++;
1929 }
1930}
1931#endif
1932
Denis Vlasenkoc666f712007-05-16 22:18:54 +00001933/* NB: called by pseudo_exec, and therefore must not modify any
1934 * global data until exec/_exit (we can be a child after vfork!) */
Eric Andersen25f27032001-04-26 23:22:31 +00001935static int run_list_real(struct pipe *pi)
1936{
Denis Vlasenko06810332007-05-21 23:30:54 +00001937 struct pipe *rpipe;
1938#if ENABLE_HUSH_LOOPS
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00001939 char *for_varname = NULL;
1940 char **for_lcur = NULL;
1941 char **for_list = NULL;
Eric Andersen4c9b68f2002-04-13 12:33:41 +00001942 int flag_rep = 0;
Denis Vlasenko06810332007-05-21 23:30:54 +00001943#endif
Eric Andersen4c9b68f2002-04-13 12:33:41 +00001944 int save_num_progs;
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00001945 int flag_skip = 1;
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00001946 int rcode = 0; /* probably for gcc only */
Eric Andersen4c9b68f2002-04-13 12:33:41 +00001947 int flag_restore = 0;
Denis Vlasenko06810332007-05-21 23:30:54 +00001948#if ENABLE_HUSH_IF
Denis Vlasenko0c886c62007-01-30 22:30:09 +00001949 int if_code = 0, next_if_code = 0; /* need double-buffer to handle elif */
Denis Vlasenko06810332007-05-21 23:30:54 +00001950#else
1951 enum { if_code = 0, next_if_code = 0 };
1952#endif
Denis Vlasenko219e88d2007-05-21 10:18:23 +00001953 reserved_style rword;
1954 reserved_style skip_more_for_this_rword = RES_XXXX;
Denis Vlasenko4ac530c2007-05-02 15:35:45 +00001955
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +00001956 debug_printf_exec("run_list_real start lvl %d\n", run_list_level + 1);
Denis Vlasenko4ac530c2007-05-02 15:35:45 +00001957
Denis Vlasenko06810332007-05-21 23:30:54 +00001958#if ENABLE_HUSH_LOOPS
Eric Andersen4c9b68f2002-04-13 12:33:41 +00001959 /* check syntax for "for" */
1960 for (rpipe = pi; rpipe; rpipe = rpipe->next) {
Denis Vlasenko219e88d2007-05-21 10:18:23 +00001961 if ((rpipe->res_word == RES_IN || rpipe->res_word == RES_FOR)
Denis Vlasenko0c886c62007-01-30 22:30:09 +00001962 && (rpipe->next == NULL)
1963 ) {
Denis Vlasenko90e485c2007-05-23 15:22:50 +00001964 syntax("malformed for"); /* no IN or no commands after IN */
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +00001965 debug_printf_exec("run_list_real lvl %d return 1\n", run_list_level);
Denis Vlasenko0c886c62007-01-30 22:30:09 +00001966 return 1;
Eric Andersenc7bda1c2004-03-15 08:29:22 +00001967 }
Denis Vlasenko219e88d2007-05-21 10:18:23 +00001968 if ((rpipe->res_word == RES_IN && rpipe->next->res_word == RES_IN && rpipe->next->progs[0].argv != NULL)
1969 || (rpipe->res_word == RES_FOR && rpipe->next->res_word != RES_IN)
Denis Vlasenko0c886c62007-01-30 22:30:09 +00001970 ) {
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00001971 /* TODO: what is tested in the first condition? */
Denis Vlasenko90e485c2007-05-23 15:22:50 +00001972 syntax("malformed for"); /* 2nd condition: not followed by IN */
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +00001973 debug_printf_exec("run_list_real lvl %d return 1\n", run_list_level);
Denis Vlasenko0c886c62007-01-30 22:30:09 +00001974 return 1;
Eric Andersen4c9b68f2002-04-13 12:33:41 +00001975 }
1976 }
Denis Vlasenko06810332007-05-21 23:30:54 +00001977#else
1978 rpipe = NULL;
1979#endif
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00001980
1981#if ENABLE_HUSH_JOB
1982 /* Example of nested list: "while true; do { sleep 1 | exit 2; } done".
1983 * We are saving state before entering outermost list ("while...done")
1984 * so that ctrl-Z will correctly background _entire_ outermost list,
1985 * not just a part of it (like "sleep 1 | exit 2") */
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +00001986 if (++run_list_level == 1 && interactive_fd) {
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00001987 if (sigsetjmp(toplevel_jb, 1)) {
1988 /* ctrl-Z forked and we are parent; or ctrl-C.
1989 * Sighandler has longjmped us here */
1990 signal(SIGINT, SIG_IGN);
1991 signal(SIGTSTP, SIG_IGN);
1992 /* Restore level (we can be coming from deep inside
1993 * nested levels) */
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +00001994 run_list_level = 1;
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00001995#if ENABLE_FEATURE_SH_STANDALONE
1996 if (nofork_save.saved) { /* if save area is valid */
1997 debug_printf_jobs("exiting nofork early\n");
1998 restore_nofork_data(&nofork_save);
1999 }
2000#endif
2001 if (ctrl_z_flag) {
2002 /* ctrl-Z has forked and stored pid of the child in pi->pid.
2003 * Remember this child as background job */
2004 insert_bg_job(pi);
2005 } else {
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00002006 /* ctrl-C. We just stop doing whatever we were doing */
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00002007 putchar('\n');
2008 }
2009 rcode = 0;
2010 goto ret;
2011 }
2012 /* ctrl-Z handler will store pid etc in pi */
2013 toplevel_list = pi;
2014 ctrl_z_flag = 0;
2015#if ENABLE_FEATURE_SH_STANDALONE
2016 nofork_save.saved = 0; /* in case we will run a nofork later */
2017#endif
2018 signal_SA_RESTART(SIGTSTP, handler_ctrl_z);
2019 signal(SIGINT, handler_ctrl_c);
2020 }
2021#endif
2022
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00002023 for (; pi; pi = flag_restore ? rpipe : pi->next) {
Denis Vlasenko219e88d2007-05-21 10:18:23 +00002024 rword = pi->res_word;
Denis Vlasenko06810332007-05-21 23:30:54 +00002025#if ENABLE_HUSH_LOOPS
Denis Vlasenko219e88d2007-05-21 10:18:23 +00002026 if (rword == RES_WHILE || rword == RES_UNTIL || rword == RES_FOR) {
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002027 flag_restore = 0;
2028 if (!rpipe) {
2029 flag_rep = 0;
2030 rpipe = pi;
2031 }
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002032 }
Denis Vlasenko06810332007-05-21 23:30:54 +00002033#endif
Denis Vlasenko219e88d2007-05-21 10:18:23 +00002034 debug_printf_exec(": rword=%d if_code=%d next_if_code=%d skip_more=%d\n",
2035 rword, if_code, next_if_code, skip_more_for_this_rword);
2036 if (rword == skip_more_for_this_rword && flag_skip) {
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002037 if (pi->followup == PIPE_SEQ)
2038 flag_skip = 0;
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002039 continue;
2040 }
2041 flag_skip = 1;
Denis Vlasenko219e88d2007-05-21 10:18:23 +00002042 skip_more_for_this_rword = RES_XXXX;
Denis Vlasenko06810332007-05-21 23:30:54 +00002043#if ENABLE_HUSH_IF
Denis Vlasenko219e88d2007-05-21 10:18:23 +00002044 if (rword == RES_THEN || rword == RES_ELSE)
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002045 if_code = next_if_code;
Denis Vlasenko219e88d2007-05-21 10:18:23 +00002046 if (rword == RES_THEN && if_code)
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002047 continue;
Denis Vlasenko219e88d2007-05-21 10:18:23 +00002048 if (rword == RES_ELSE && !if_code)
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002049 continue;
Denis Vlasenko219e88d2007-05-21 10:18:23 +00002050 if (rword == RES_ELIF && !if_code)
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002051 break;
Denis Vlasenko06810332007-05-21 23:30:54 +00002052#endif
2053#if ENABLE_HUSH_LOOPS
Denis Vlasenko219e88d2007-05-21 10:18:23 +00002054 if (rword == RES_FOR && pi->num_progs) {
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00002055 if (!for_lcur) {
Eric Andersenc7bda1c2004-03-15 08:29:22 +00002056 /* if no variable values after "in" we skip "for" */
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002057 if (!pi->next->progs->argv)
2058 continue;
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002059 /* create list of variable values */
Denis Vlasenko170435c2007-05-23 13:01:10 +00002060 for_list = expand_strvec_to_strvec(pi->next->progs->argv);
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00002061 for_lcur = for_list;
2062 for_varname = pi->progs->argv[0];
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002063 pi->progs->argv[0] = NULL;
2064 flag_rep = 1;
Eric Andersenc7bda1c2004-03-15 08:29:22 +00002065 }
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00002066 free(pi->progs->argv[0]);
2067 if (!*for_lcur) {
2068 free(for_list);
2069 for_lcur = NULL;
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002070 flag_rep = 0;
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00002071 pi->progs->argv[0] = for_varname;
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002072 pi->progs->glob_result.gl_pathv[0] = pi->progs->argv[0];
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002073 continue;
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002074 }
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00002075 /* insert next value from for_lcur */
Denis Vlasenko764d59d2007-05-14 16:23:23 +00002076 /* vda: does it need escaping? */
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00002077 pi->progs->argv[0] = xasprintf("%s=%s", for_varname, *for_lcur++);
Denis Vlasenko5f786c22007-04-20 08:35:45 +00002078 pi->progs->glob_result.gl_pathv[0] = pi->progs->argv[0];
Eric Andersenc7bda1c2004-03-15 08:29:22 +00002079 }
Denis Vlasenko219e88d2007-05-21 10:18:23 +00002080 if (rword == RES_IN)
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002081 continue;
Denis Vlasenko219e88d2007-05-21 10:18:23 +00002082 if (rword == RES_DO) {
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002083 if (!flag_rep)
2084 continue;
Tim Rikerc1ef7bd2006-01-25 00:08:53 +00002085 }
Denis Vlasenko219e88d2007-05-21 10:18:23 +00002086 if (rword == RES_DONE) {
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002087 if (flag_rep) {
2088 flag_restore = 1;
2089 } else {
2090 rpipe = NULL;
2091 }
Eric Andersenc7bda1c2004-03-15 08:29:22 +00002092 }
Denis Vlasenko06810332007-05-21 23:30:54 +00002093#endif
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002094 if (pi->num_progs == 0)
2095 continue;
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002096 save_num_progs = pi->num_progs; /* save number of programs */
Denis Vlasenkod01ff132007-05-02 21:40:23 +00002097 debug_printf_exec(": run_pipe_real with %d members\n", pi->num_progs);
Eric Andersen25f27032001-04-26 23:22:31 +00002098 rcode = run_pipe_real(pi);
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002099 if (rcode != -1) {
Eric Andersen25f27032001-04-26 23:22:31 +00002100 /* We only ran a builtin: rcode was set by the return value
2101 * of run_pipe_real(), and we don't need to wait for anything. */
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002102 } else if (pi->followup == PIPE_BG) {
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00002103 /* What does bash do with attempts to background builtins? */
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00002104 /* Even bash 3.2 doesn't do that well with nested bg:
2105 * try "{ { sleep 10; echo DEEP; } & echo HERE; } &".
Denis Vlasenko170435c2007-05-23 13:01:10 +00002106 * I'm NOT treating inner &'s as jobs */
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00002107#if ENABLE_HUSH_JOB
Denis Vlasenko4b924f32007-05-30 00:29:55 +00002108 if (run_list_level == 1)
Denis Vlasenko170435c2007-05-23 13:01:10 +00002109 insert_bg_job(pi);
Denis Vlasenkob81b3df2007-04-28 16:48:04 +00002110#endif
Eric Andersen25f27032001-04-26 23:22:31 +00002111 rcode = EXIT_SUCCESS;
2112 } else {
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00002113#if ENABLE_HUSH_JOB
Denis Vlasenko170435c2007-05-23 13:01:10 +00002114 /* Paranoia, just "interactive_fd" should be enough? */
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +00002115 if (run_list_level == 1 && interactive_fd) {
Denis Vlasenko170435c2007-05-23 13:01:10 +00002116 /* waits for completion, then fg's main shell */
Denis Vlasenko52881e92007-04-21 13:42:52 +00002117 rcode = checkjobs_and_fg_shell(pi);
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00002118 } else
2119#endif
2120 {
Denis Vlasenko170435c2007-05-23 13:01:10 +00002121 /* this one just waits for completion */
Eric Andersenc798b072001-06-22 06:23:03 +00002122 rcode = checkjobs(pi);
Eric Andersen25f27032001-04-26 23:22:31 +00002123 }
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00002124 debug_printf_exec(": checkjobs returned %d\n", rcode);
Eric Andersen25f27032001-04-26 23:22:31 +00002125 }
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00002126 debug_printf_exec(": setting last_return_code=%d\n", rcode);
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002127 last_return_code = rcode;
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002128 pi->num_progs = save_num_progs; /* restore number of programs */
Denis Vlasenko06810332007-05-21 23:30:54 +00002129#if ENABLE_HUSH_IF
Denis Vlasenko219e88d2007-05-21 10:18:23 +00002130 if (rword == RES_IF || rword == RES_ELIF)
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002131 next_if_code = rcode; /* can be overwritten a number of times */
Denis Vlasenko06810332007-05-21 23:30:54 +00002132#endif
2133#if ENABLE_HUSH_LOOPS
Denis Vlasenko219e88d2007-05-21 10:18:23 +00002134 if (rword == RES_WHILE)
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002135 flag_rep = !last_return_code;
Denis Vlasenko219e88d2007-05-21 10:18:23 +00002136 if (rword == RES_UNTIL)
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002137 flag_rep = last_return_code;
Denis Vlasenko06810332007-05-21 23:30:54 +00002138#endif
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002139 if ((rcode == EXIT_SUCCESS && pi->followup == PIPE_OR)
2140 || (rcode != EXIT_SUCCESS && pi->followup == PIPE_AND)
2141 ) {
Denis Vlasenko219e88d2007-05-21 10:18:23 +00002142 skip_more_for_this_rword = rword;
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002143 }
Eric Andersen028b65b2001-06-28 01:10:11 +00002144 checkjobs(NULL);
Eric Andersen25f27032001-04-26 23:22:31 +00002145 }
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00002146
2147#if ENABLE_HUSH_JOB
2148 if (ctrl_z_flag) {
2149 /* ctrl-Z forked somewhere in the past, we are the child,
2150 * and now we completed running the list. Exit. */
2151 exit(rcode);
2152 }
2153 ret:
Denis Vlasenkoba7cf262007-05-25 14:34:30 +00002154 if (!--run_list_level && interactive_fd) {
2155 signal(SIGTSTP, SIG_IGN);
2156 signal(SIGINT, SIG_IGN);
2157 }
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00002158#endif
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +00002159 debug_printf_exec("run_list_real lvl %d return %d\n", run_list_level + 1, rcode);
Eric Andersen25f27032001-04-26 23:22:31 +00002160 return rcode;
2161}
2162
Eric Andersen25f27032001-04-26 23:22:31 +00002163/* return code is the exit status of the pipe */
Eric Andersenbf7df042001-05-23 22:18:35 +00002164static int free_pipe(struct pipe *pi, int indent)
Eric Andersen25f27032001-04-26 23:22:31 +00002165{
2166 char **p;
2167 struct child_prog *child;
2168 struct redir_struct *r, *rnext;
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002169 int a, i, ret_code = 0;
Eric Andersen52a97ca2001-06-22 06:49:26 +00002170
2171 if (pi->stopped_progs > 0)
2172 return ret_code;
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00002173 debug_printf_clean("%s run pipe: (pid %d)\n", indenter(indent), getpid());
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002174 for (i = 0; i < pi->num_progs; i++) {
Eric Andersen25f27032001-04-26 23:22:31 +00002175 child = &pi->progs[i];
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00002176 debug_printf_clean("%s command %d:\n", indenter(indent), i);
Eric Andersen25f27032001-04-26 23:22:31 +00002177 if (child->argv) {
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002178 for (a = 0, p = child->argv; *p; a++, p++) {
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00002179 debug_printf_clean("%s argv[%d] = %s\n", indenter(indent), a, *p);
Eric Andersen25f27032001-04-26 23:22:31 +00002180 }
2181 globfree(&child->glob_result);
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002182 child->argv = NULL;
Eric Andersen25f27032001-04-26 23:22:31 +00002183 } else if (child->group) {
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00002184 debug_printf_clean("%s begin group (subshell:%d)\n", indenter(indent), child->subshell);
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002185 ret_code = free_pipe_list(child->group, indent+3);
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00002186 debug_printf_clean("%s end group\n", indenter(indent));
Eric Andersen25f27032001-04-26 23:22:31 +00002187 } else {
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00002188 debug_printf_clean("%s (nil)\n", indenter(indent));
Eric Andersen25f27032001-04-26 23:22:31 +00002189 }
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002190 for (r = child->redirects; r; r = rnext) {
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00002191 debug_printf_clean("%s redirect %d%s", indenter(indent), r->fd, redir_table[r->type].descrip);
Eric Andersen25f27032001-04-26 23:22:31 +00002192 if (r->dup == -1) {
Eric Andersen817e73c2001-06-06 17:56:09 +00002193 /* guard against the case >$FOO, where foo is unset or blank */
2194 if (r->word.gl_pathv) {
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00002195 debug_printf_clean(" %s\n", *r->word.gl_pathv);
Eric Andersen817e73c2001-06-06 17:56:09 +00002196 globfree(&r->word);
2197 }
Eric Andersen25f27032001-04-26 23:22:31 +00002198 } else {
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00002199 debug_printf_clean("&%d\n", r->dup);
Eric Andersen25f27032001-04-26 23:22:31 +00002200 }
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002201 rnext = r->next;
Eric Andersen25f27032001-04-26 23:22:31 +00002202 free(r);
2203 }
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002204 child->redirects = NULL;
Eric Andersen25f27032001-04-26 23:22:31 +00002205 }
2206 free(pi->progs); /* children are an array, they get freed all at once */
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002207 pi->progs = NULL;
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00002208#if ENABLE_HUSH_JOB
Denis Vlasenko3ac0e002007-04-28 16:45:22 +00002209 free(pi->cmdtext);
2210 pi->cmdtext = NULL;
Denis Vlasenkob81b3df2007-04-28 16:48:04 +00002211#endif
Eric Andersen25f27032001-04-26 23:22:31 +00002212 return ret_code;
2213}
2214
Eric Andersenbf7df042001-05-23 22:18:35 +00002215static int free_pipe_list(struct pipe *head, int indent)
Eric Andersen25f27032001-04-26 23:22:31 +00002216{
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002217 int rcode = 0; /* if list has no members */
Eric Andersen25f27032001-04-26 23:22:31 +00002218 struct pipe *pi, *next;
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00002219
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002220 for (pi = head; pi; pi = next) {
Denis Vlasenko219e88d2007-05-21 10:18:23 +00002221 debug_printf_clean("%s pipe reserved mode %d\n", indenter(indent), pi->res_word);
Eric Andersenbf7df042001-05-23 22:18:35 +00002222 rcode = free_pipe(pi, indent);
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00002223 debug_printf_clean("%s pipe followup code %d\n", indenter(indent), pi->followup);
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002224 next = pi->next;
Denis Vlasenko5f786c22007-04-20 08:35:45 +00002225 /*pi->next = NULL;*/
Eric Andersen25f27032001-04-26 23:22:31 +00002226 free(pi);
2227 }
Eric Andersenc7bda1c2004-03-15 08:29:22 +00002228 return rcode;
Eric Andersen25f27032001-04-26 23:22:31 +00002229}
2230
2231/* Select which version we will use */
2232static int run_list(struct pipe *pi)
2233{
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002234 int rcode = 0;
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00002235 debug_printf_exec("run_list entered\n");
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002236 if (fake_mode == 0) {
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00002237 debug_printf_exec(": run_list_real with %d members\n", pi->num_progs);
Eric Andersen25f27032001-04-26 23:22:31 +00002238 rcode = run_list_real(pi);
Eric Andersenc7bda1c2004-03-15 08:29:22 +00002239 }
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00002240 /* free_pipe_list has the side effect of clearing memory.
Eric Andersen25f27032001-04-26 23:22:31 +00002241 * In the long run that function can be merged with run_list_real,
2242 * but doing that now would hobble the debugging effort. */
Denis Vlasenko400c5b62007-05-04 13:07:27 +00002243 free_pipe_list(pi, 0);
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00002244 debug_printf_exec("run_list return %d\n", rcode);
Eric Andersen25f27032001-04-26 23:22:31 +00002245 return rcode;
2246}
2247
2248/* The API for glob is arguably broken. This routine pushes a non-matching
2249 * string into the output structure, removing non-backslashed backslashes.
2250 * If someone can prove me wrong, by performing this function within the
2251 * original glob(3) api, feel free to rewrite this routine into oblivion.
2252 * Return code (0 vs. GLOB_NOSPACE) matches glob(3).
2253 * XXX broken if the last character is '\\', check that before calling.
2254 */
2255static int globhack(const char *src, int flags, glob_t *pglob)
2256{
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002257 int cnt = 0, pathc;
Eric Andersen25f27032001-04-26 23:22:31 +00002258 const char *s;
2259 char *dest;
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002260 for (cnt = 1, s = src; s && *s; s++) {
Eric Andersen25f27032001-04-26 23:22:31 +00002261 if (*s == '\\') s++;
2262 cnt++;
2263 }
Denis Vlasenkoc666f712007-05-16 22:18:54 +00002264 dest = xmalloc(cnt);
Eric Andersen25f27032001-04-26 23:22:31 +00002265 if (!(flags & GLOB_APPEND)) {
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002266 pglob->gl_pathv = NULL;
2267 pglob->gl_pathc = 0;
2268 pglob->gl_offs = 0;
2269 pglob->gl_offs = 0;
Eric Andersen25f27032001-04-26 23:22:31 +00002270 }
2271 pathc = ++pglob->gl_pathc;
Denis Vlasenkoc666f712007-05-16 22:18:54 +00002272 pglob->gl_pathv = xrealloc(pglob->gl_pathv, (pathc+1) * sizeof(*pglob->gl_pathv));
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002273 pglob->gl_pathv[pathc-1] = dest;
2274 pglob->gl_pathv[pathc] = NULL;
2275 for (s = src; s && *s; s++, dest++) {
Eric Andersen25f27032001-04-26 23:22:31 +00002276 if (*s == '\\') s++;
2277 *dest = *s;
2278 }
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002279 *dest = '\0';
Eric Andersen25f27032001-04-26 23:22:31 +00002280 return 0;
2281}
2282
2283/* XXX broken if the last character is '\\', check that before calling */
2284static int glob_needed(const char *s)
2285{
2286 for (; *s; s++) {
2287 if (*s == '\\') s++;
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002288 if (strchr("*[?", *s)) return 1;
Eric Andersen25f27032001-04-26 23:22:31 +00002289 }
2290 return 0;
2291}
2292
Eric Andersen25f27032001-04-26 23:22:31 +00002293static int xglob(o_string *dest, int flags, glob_t *pglob)
2294{
2295 int gr;
2296
Tim Rikerc1ef7bd2006-01-25 00:08:53 +00002297 /* short-circuit for null word */
Eric Andersen25f27032001-04-26 23:22:31 +00002298 /* we can code this better when the debug_printf's are gone */
Tim Rikerc1ef7bd2006-01-25 00:08:53 +00002299 if (dest->length == 0) {
2300 if (dest->nonnull) {
2301 /* bash man page calls this an "explicit" null */
2302 gr = globhack(dest->data, flags, pglob);
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002303 debug_printf("globhack returned %d\n", gr);
Tim Rikerc1ef7bd2006-01-25 00:08:53 +00002304 } else {
Eric Andersen25f27032001-04-26 23:22:31 +00002305 return 0;
2306 }
Tim Rikerc1ef7bd2006-01-25 00:08:53 +00002307 } else if (glob_needed(dest->data)) {
Eric Andersen25f27032001-04-26 23:22:31 +00002308 gr = glob(dest->data, flags, NULL, pglob);
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002309 debug_printf("glob returned %d\n", gr);
Eric Andersen25f27032001-04-26 23:22:31 +00002310 if (gr == GLOB_NOMATCH) {
2311 /* quote removal, or more accurately, backslash removal */
2312 gr = globhack(dest->data, flags, pglob);
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002313 debug_printf("globhack returned %d\n", gr);
Eric Andersen25f27032001-04-26 23:22:31 +00002314 }
2315 } else {
2316 gr = globhack(dest->data, flags, pglob);
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002317 debug_printf("globhack returned %d\n", gr);
Eric Andersen25f27032001-04-26 23:22:31 +00002318 }
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00002319 if (gr == GLOB_NOSPACE)
Manuel Novoa III cad53642003-03-19 09:13:01 +00002320 bb_error_msg_and_die("out of memory during glob");
Eric Andersen25f27032001-04-26 23:22:31 +00002321 if (gr != 0) { /* GLOB_ABORTED ? */
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002322 bb_error_msg("glob(3) error %d", gr);
Eric Andersen25f27032001-04-26 23:22:31 +00002323 }
2324 /* globprint(glob_target); */
2325 return gr;
2326}
2327
Denis Vlasenko170435c2007-05-23 13:01:10 +00002328/* expand_strvec_to_strvec() takes a list of strings, expands
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00002329 * all variable references within and returns a pointer to
2330 * a list of expanded strings, possibly with larger number
2331 * of strings. (Think VAR="a b"; echo $VAR).
2332 * This new list is allocated as a single malloc block.
2333 * NULL-terminated list of char* pointers is at the beginning of it,
2334 * followed by strings themself.
2335 * Caller can deallocate entire list by single free(list). */
2336
2337/* Helpers first:
Denis Vlasenko8f6bdb42007-05-16 09:36:55 +00002338 * count_XXX estimates size of the block we need. It's okay
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00002339 * to over-estimate sizes a bit, if it makes code simpler */
2340static int count_ifs(const char *str)
2341{
2342 int cnt = 0;
2343 debug_printf_expand("count_ifs('%s') ifs='%s'", str, ifs);
2344 while (1) {
2345 str += strcspn(str, ifs);
2346 if (!*str) break;
Denis Vlasenkoc666f712007-05-16 22:18:54 +00002347 str++; /* str += strspn(str, ifs); */
2348 cnt++; /* cnt += strspn(str, ifs); - but this code is larger */
Denis Vlasenko87cb2db2007-04-21 10:00:01 +00002349 }
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00002350 debug_printf_expand(" return %d\n", cnt);
2351 return cnt;
2352}
2353
2354static void count_var_expansion_space(int *countp, int *lenp, char *arg)
2355{
2356 char first_ch;
2357 int i;
2358 int len = *lenp;
2359 int count = *countp;
2360 const char *val;
2361 char *p;
2362
2363 while ((p = strchr(arg, SPECIAL_VAR_SYMBOL))) {
2364 len += p - arg;
2365 arg = ++p;
2366 p = strchr(p, SPECIAL_VAR_SYMBOL);
2367 first_ch = arg[0];
2368
2369 switch (first_ch & 0x7f) {
2370 /* high bit in 1st_ch indicates that var is double-quoted */
2371 case '$': /* pid */
2372 case '!': /* bg pid */
2373 case '?': /* exitcode */
2374 case '#': /* argc */
2375 len += sizeof(int)*3 + 1; /* enough for int */
2376 break;
2377 case '*':
2378 case '@':
2379 for (i = 1; i < global_argc; i++) {
2380 len += strlen(global_argv[i]) + 1;
2381 count++;
2382 if (!(first_ch & 0x80))
2383 count += count_ifs(global_argv[i]);
2384 }
2385 break;
2386 default:
2387 *p = '\0';
2388 arg[0] = first_ch & 0x7f;
Denis Vlasenko764d59d2007-05-14 16:23:23 +00002389 if (isdigit(arg[0])) {
2390 i = xatoi_u(arg);
2391 val = NULL;
2392 if (i < global_argc)
2393 val = global_argv[i];
2394 } else
2395 val = lookup_param(arg);
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00002396 arg[0] = first_ch;
2397 *p = SPECIAL_VAR_SYMBOL;
2398
2399 if (val) {
2400 len += strlen(val) + 1;
2401 if (!(first_ch & 0x80))
2402 count += count_ifs(val);
2403 }
2404 }
2405 arg = ++p;
2406 }
2407
2408 len += strlen(arg) + 1;
2409 count++;
2410 *lenp = len;
2411 *countp = count;
2412}
2413
2414/* Store given string, finalizing the word and starting new one whenever
2415 * we encounter ifs char(s). This is used for expanding variable values.
Denis Vlasenko764d59d2007-05-14 16:23:23 +00002416 * End-of-string does NOT finalize word: think about 'echo -$VAR-' */
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00002417static int expand_on_ifs(char **list, int n, char **posp, const char *str)
2418{
2419 char *pos = *posp;
2420 while (1) {
2421 int word_len = strcspn(str, ifs);
2422 if (word_len) {
2423 memcpy(pos, str, word_len); /* store non-ifs chars */
2424 pos += word_len;
2425 str += word_len;
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00002426 }
Denis Vlasenko764d59d2007-05-14 16:23:23 +00002427 if (!*str) /* EOL - do not finalize word */
2428 break;
2429 *pos++ = '\0';
2430 if (n) debug_printf_expand("expand_on_ifs finalized list[%d]=%p '%s' "
2431 "strlen=%d next=%p pos=%p\n", n-1, list[n-1], list[n-1],
2432 strlen(list[n-1]), list[n-1] + strlen(list[n-1]) + 1, pos);
2433 list[n++] = pos;
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00002434 str += strspn(str, ifs); /* skip ifs chars */
2435 }
2436 *posp = pos;
2437 return n;
2438}
2439
2440/* Expand all variable references in given string, adding words to list[]
2441 * at n, n+1,... positions. Return updated n (so that list[n] is next one
2442 * to be filled). This routine is extremely tricky: has to deal with
2443 * variables/parameters with whitespace, $* and $@, and constructs like
2444 * 'echo -$*-'. If you play here, you must run testsuite afterwards! */
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00002445/* NB: another bug is that we cannot detect empty strings yet:
2446 * "" or $empty"" expands to zero words, has to expand to empty word */
Denis Vlasenkob6a741f2007-05-17 14:38:17 +00002447static int expand_vars_to_list(char **list, int n, char **posp, char *arg, char or_mask)
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00002448{
Denis Vlasenkob6a741f2007-05-17 14:38:17 +00002449 /* or_mask is either 0 (normal case) or 0x80
2450 * (expansion of right-hand side of assignment == 1-element expand) */
2451
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00002452 char first_ch, ored_ch;
Denis Vlasenko1f4cf512007-05-16 10:39:24 +00002453 int i;
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00002454 const char *val;
2455 char *p;
2456 char *pos = *posp;
2457
2458 ored_ch = 0;
2459
2460 if (n) debug_printf_expand("expand_vars_to_list finalized list[%d]=%p '%s' "
2461 "strlen=%d next=%p pos=%p\n", n-1, list[n-1], list[n-1],
2462 strlen(list[n-1]), list[n-1] + strlen(list[n-1]) + 1, pos);
2463 list[n++] = pos;
2464
2465 while ((p = strchr(arg, SPECIAL_VAR_SYMBOL))) {
2466 memcpy(pos, arg, p - arg);
2467 pos += (p - arg);
2468 arg = ++p;
2469 p = strchr(p, SPECIAL_VAR_SYMBOL);
2470
Denis Vlasenkob6a741f2007-05-17 14:38:17 +00002471 first_ch = arg[0] | or_mask; /* forced to "quoted" if or_mask = 0x80 */
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00002472 ored_ch |= first_ch;
2473 val = NULL;
2474 switch (first_ch & 0x7f) {
2475 /* Highest bit in first_ch indicates that var is double-quoted */
2476 case '$': /* pid */
2477 /* FIXME: (echo $$) should still print pid of main shell */
2478 val = utoa(getpid());
2479 break;
2480 case '!': /* bg pid */
2481 val = last_bg_pid ? utoa(last_bg_pid) : (char*)"";
2482 break;
2483 case '?': /* exitcode */
2484 val = utoa(last_return_code);
2485 break;
2486 case '#': /* argc */
2487 val = utoa(global_argc ? global_argc-1 : 0);
2488 break;
2489 case '*':
2490 case '@':
Denis Vlasenko1f4cf512007-05-16 10:39:24 +00002491 i = 1;
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00002492 if (!(first_ch & 0x80)) { /* unquoted $* or $@ */
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00002493 while (i < global_argc) {
2494 n = expand_on_ifs(list, n, &pos, global_argv[i]);
2495 debug_printf_expand("expand_vars_to_list: argv %d (last %d)\n", i, global_argc-1);
2496 if (global_argv[i++][0] && i < global_argc) {
2497 /* this argv[] is not empty and not last:
2498 * put terminating NUL, start new word */
2499 *pos++ = '\0';
2500 if (n) debug_printf_expand("expand_vars_to_list 2 finalized list[%d]=%p '%s' "
2501 "strlen=%d next=%p pos=%p\n", n-1, list[n-1], list[n-1],
2502 strlen(list[n-1]), list[n-1] + strlen(list[n-1]) + 1, pos);
2503 list[n++] = pos;
2504 }
2505 }
Denis Vlasenkob6a741f2007-05-17 14:38:17 +00002506 } else
2507 /* If or_mask is nonzero, we handle assignment 'a=....$@.....'
2508 * and in this case should theat it like '$*' */
2509 if (first_ch == ('@'|0x80) && !or_mask) { /* quoted $@ */
Denis Vlasenko1f4cf512007-05-16 10:39:24 +00002510 while (1) {
2511 strcpy(pos, global_argv[i]);
2512 pos += strlen(global_argv[i]);
2513 if (++i >= global_argc)
2514 break;
2515 *pos++ = '\0';
2516 if (n) debug_printf_expand("expand_vars_to_list 3 finalized list[%d]=%p '%s' "
2517 "strlen=%d next=%p pos=%p\n", n-1, list[n-1], list[n-1],
2518 strlen(list[n-1]), list[n-1] + strlen(list[n-1]) + 1, pos);
2519 list[n++] = pos;
2520 }
2521 } else { /* quoted $*: add as one word */
2522 while (1) {
2523 strcpy(pos, global_argv[i]);
2524 pos += strlen(global_argv[i]);
2525 if (++i >= global_argc)
2526 break;
2527 if (ifs[0])
2528 *pos++ = ifs[0];
2529 }
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00002530 }
2531 break;
2532 default:
2533 *p = '\0';
2534 arg[0] = first_ch & 0x7f;
Denis Vlasenko764d59d2007-05-14 16:23:23 +00002535 if (isdigit(arg[0])) {
Denis Vlasenko1f4cf512007-05-16 10:39:24 +00002536 i = xatoi_u(arg);
Denis Vlasenko764d59d2007-05-14 16:23:23 +00002537 val = NULL;
2538 if (i < global_argc)
2539 val = global_argv[i];
2540 } else
2541 val = lookup_param(arg);
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00002542 arg[0] = first_ch;
2543 *p = SPECIAL_VAR_SYMBOL;
Denis Vlasenko1f4cf512007-05-16 10:39:24 +00002544 if (!(first_ch & 0x80)) { /* unquoted $VAR */
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00002545 if (val) {
2546 n = expand_on_ifs(list, n, &pos, val);
2547 val = NULL;
2548 }
Denis Vlasenko1f4cf512007-05-16 10:39:24 +00002549 } /* else: quoted $VAR, val will be appended at pos */
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00002550 }
2551 if (val) {
2552 strcpy(pos, val);
2553 pos += strlen(val);
2554 }
2555 arg = ++p;
2556 }
2557 debug_printf_expand("expand_vars_to_list adding tail '%s' at %p\n", arg, pos);
2558 strcpy(pos, arg);
2559 pos += strlen(arg) + 1;
2560 if (pos == list[n-1] + 1) { /* expansion is empty */
2561 if (!(ored_ch & 0x80)) { /* all vars were not quoted... */
2562 debug_printf_expand("expand_vars_to_list list[%d] empty, going back\n", n);
2563 pos--;
2564 n--;
2565 }
2566 }
2567
2568 *posp = pos;
2569 return n;
2570}
2571
Denis Vlasenkob6a741f2007-05-17 14:38:17 +00002572static char **expand_variables(char **argv, char or_mask)
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00002573{
2574 int n;
2575 int count = 1;
2576 int len = 0;
2577 char *pos, **v, **list;
2578
2579 v = argv;
2580 if (!*v) debug_printf_expand("count_var_expansion_space: "
2581 "argv[0]=NULL count=%d len=%d alloc_space=%d\n",
2582 count, len, sizeof(char*) * count + len);
2583 while (*v) {
2584 count_var_expansion_space(&count, &len, *v);
2585 debug_printf_expand("count_var_expansion_space: "
2586 "'%s' count=%d len=%d alloc_space=%d\n",
2587 *v, count, len, sizeof(char*) * count + len);
2588 v++;
2589 }
2590 len += sizeof(char*) * count; /* total to alloc */
2591 list = xmalloc(len);
2592 pos = (char*)(list + count);
2593 debug_printf_expand("list=%p, list[0] should be %p\n", list, pos);
2594 n = 0;
2595 v = argv;
2596 while (*v)
Denis Vlasenkob6a741f2007-05-17 14:38:17 +00002597 n = expand_vars_to_list(list, n, &pos, *v++, or_mask);
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00002598
Denis Vlasenkob6a741f2007-05-17 14:38:17 +00002599 if (n) debug_printf_expand("finalized list[%d]=%p '%s' "
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00002600 "strlen=%d next=%p pos=%p\n", n-1, list[n-1], list[n-1],
2601 strlen(list[n-1]), list[n-1] + strlen(list[n-1]) + 1, pos);
Denis Vlasenko87cb2db2007-04-21 10:00:01 +00002602 list[n] = NULL;
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00002603
2604#ifdef DEBUG_EXPAND
2605 {
2606 int m = 0;
2607 while (m <= n) {
2608 debug_printf_expand("list[%d]=%p '%s'\n", m, list[m], list[m]);
2609 m++;
2610 }
2611 debug_printf_expand("used_space=%d\n", pos - (char*)list);
2612 }
2613#endif
Denis Vlasenko170435c2007-05-23 13:01:10 +00002614 if (ENABLE_HUSH_DEBUG)
2615 if (pos - (char*)list > len)
2616 bb_error_msg_and_die("BUG in varexp");
Denis Vlasenko87cb2db2007-04-21 10:00:01 +00002617 return list;
2618}
2619
Denis Vlasenko170435c2007-05-23 13:01:10 +00002620static char **expand_strvec_to_strvec(char **argv)
Denis Vlasenko87cb2db2007-04-21 10:00:01 +00002621{
Denis Vlasenkob6a741f2007-05-17 14:38:17 +00002622 return expand_variables(argv, 0);
Denis Vlasenko87cb2db2007-04-21 10:00:01 +00002623}
2624
Denis Vlasenko170435c2007-05-23 13:01:10 +00002625static char *expand_string_to_string(const char *str)
Denis Vlasenkob6a741f2007-05-17 14:38:17 +00002626{
2627 char *argv[2], **list;
2628
2629 argv[0] = (char*)str;
2630 argv[1] = NULL;
2631 list = expand_variables(argv, 0x80); /* 0x80: make one-element expansion */
Denis Vlasenko170435c2007-05-23 13:01:10 +00002632 if (ENABLE_HUSH_DEBUG)
2633 if (!list[0] || list[1])
2634 bb_error_msg_and_die("BUG in varexp2");
Denis Vlasenkob6a741f2007-05-17 14:38:17 +00002635 /* actually, just move string 2*sizeof(char*) bytes back */
2636 strcpy((char*)list, list[0]);
Denis Vlasenko170435c2007-05-23 13:01:10 +00002637 debug_printf_expand("string_to_string='%s'\n", (char*)list);
2638 return (char*)list;
2639}
2640
2641static char* expand_strvec_to_string(char **argv)
2642{
2643 char **list;
2644
2645 list = expand_variables(argv, 0x80);
2646 /* Convert all NULs to spaces */
2647 if (list[0]) {
2648 int n = 1;
2649 while (list[n]) {
2650 if (ENABLE_HUSH_DEBUG)
2651 if (list[n-1] + strlen(list[n-1]) + 1 != list[n])
2652 bb_error_msg_and_die("BUG in varexp3");
2653 list[n][-1] = ' '; /* TODO: or to ifs[0]? */
2654 n++;
2655 }
2656 }
2657 strcpy((char*)list, list[0]);
2658 debug_printf_expand("strvec_to_string='%s'\n", (char*)list);
Denis Vlasenkob6a741f2007-05-17 14:38:17 +00002659 return (char*)list;
2660}
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00002661
Eric Andersenf72f5622001-05-15 23:21:41 +00002662/* This is used to get/check local shell variables */
Denis Vlasenko28c0f0f2007-05-25 02:46:01 +00002663static struct variable *get_local_var(const char *name)
Eric Andersenf72f5622001-05-15 23:21:41 +00002664{
Denis Vlasenkod76c0492007-05-25 02:16:25 +00002665 struct variable *cur;
2666 int len;
Eric Andersenf72f5622001-05-15 23:21:41 +00002667
Denis Vlasenko28c0f0f2007-05-25 02:46:01 +00002668 if (!name)
Eric Andersenf72f5622001-05-15 23:21:41 +00002669 return NULL;
Denis Vlasenko28c0f0f2007-05-25 02:46:01 +00002670 len = strlen(name);
Denis Vlasenkod76c0492007-05-25 02:16:25 +00002671 for (cur = top_var; cur; cur = cur->next) {
Denis Vlasenko28c0f0f2007-05-25 02:46:01 +00002672 if (strncmp(cur->varstr, name, len) == 0 && cur->varstr[len] == '=')
Denis Vlasenkod76c0492007-05-25 02:16:25 +00002673 return cur;
Denis Vlasenkoe0a33672007-05-10 23:06:55 +00002674 }
Eric Andersenf72f5622001-05-15 23:21:41 +00002675 return NULL;
2676}
2677
Denis Vlasenko28c0f0f2007-05-25 02:46:01 +00002678/* str holds "NAME=VAL" and is expected to be malloced.
Denis Vlasenkod76c0492007-05-25 02:16:25 +00002679 * We take ownership of it. */
Denis Vlasenko28c0f0f2007-05-25 02:46:01 +00002680static int set_local_var(char *str, int flg_export)
Eric Andersen78a7c992001-05-15 16:30:25 +00002681{
Denis Vlasenkod76c0492007-05-25 02:16:25 +00002682 struct variable *cur;
2683 char *value;
2684 int name_len;
Eric Andersen20a69a72001-05-15 17:24:44 +00002685
Denis Vlasenko28c0f0f2007-05-25 02:46:01 +00002686 value = strchr(str, '=');
Denis Vlasenkod76c0492007-05-25 02:16:25 +00002687 if (!value) { /* not expected to ever happen? */
Denis Vlasenko28c0f0f2007-05-25 02:46:01 +00002688 free(str);
Eric Andersen99785762001-05-22 21:37:48 +00002689 return -1;
2690 }
Eric Andersen20a69a72001-05-15 17:24:44 +00002691
Denis Vlasenko201c72a2007-05-25 10:00:36 +00002692 name_len = value - str + 1; /* including '=' */
Denis Vlasenkod76c0492007-05-25 02:16:25 +00002693 cur = top_var; /* cannot be NULL (we have HUSH_VERSION and it's RO) */
2694 while (1) {
Denis Vlasenko201c72a2007-05-25 10:00:36 +00002695 if (strncmp(cur->varstr, str, name_len) != 0) {
Denis Vlasenkod76c0492007-05-25 02:16:25 +00002696 if (!cur->next) {
Denis Vlasenko201c72a2007-05-25 10:00:36 +00002697 /* Bail out. Note that now cur points
2698 * to last var in linked list */
Denis Vlasenkod76c0492007-05-25 02:16:25 +00002699 break;
Eric Andersen20a69a72001-05-15 17:24:44 +00002700 }
Denis Vlasenkod76c0492007-05-25 02:16:25 +00002701 cur = cur->next;
2702 continue;
Eric Andersen20a69a72001-05-15 17:24:44 +00002703 }
Denis Vlasenko28c0f0f2007-05-25 02:46:01 +00002704 /* We found an existing var with this name */
2705 *value = '\0';
Denis Vlasenkod76c0492007-05-25 02:16:25 +00002706 if (cur->flg_read_only) {
Denis Vlasenko28c0f0f2007-05-25 02:46:01 +00002707 bb_error_msg("%s: readonly variable", str);
2708 free(str);
Denis Vlasenkod76c0492007-05-25 02:16:25 +00002709 return -1;
2710 }
Denis Vlasenko28c0f0f2007-05-25 02:46:01 +00002711 unsetenv(str); /* just in case */
2712 *value = '=';
2713 if (strcmp(cur->varstr, str) == 0) {
Denis Vlasenkod76c0492007-05-25 02:16:25 +00002714 free_and_exp:
Denis Vlasenko28c0f0f2007-05-25 02:46:01 +00002715 free(str);
Denis Vlasenkod76c0492007-05-25 02:16:25 +00002716 goto exp;
2717 }
Denis Vlasenko28c0f0f2007-05-25 02:46:01 +00002718 if (cur->max_len >= strlen(str)) {
Denis Vlasenkod76c0492007-05-25 02:16:25 +00002719 /* This one is from startup env, reuse space */
Denis Vlasenko28c0f0f2007-05-25 02:46:01 +00002720 strcpy(cur->varstr, str);
Denis Vlasenkod76c0492007-05-25 02:16:25 +00002721 goto free_and_exp;
2722 }
2723 /* max_len == 0 signifies "malloced" var, which we can
2724 * (and has to) free */
2725 if (!cur->max_len)
Denis Vlasenko28c0f0f2007-05-25 02:46:01 +00002726 free(cur->varstr);
Denis Vlasenkod76c0492007-05-25 02:16:25 +00002727 cur->max_len = 0;
Denis Vlasenko28c0f0f2007-05-25 02:46:01 +00002728 goto set_str_and_exp;
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00002729 }
Eric Andersen20a69a72001-05-15 17:24:44 +00002730
Denis Vlasenkod76c0492007-05-25 02:16:25 +00002731 /* Not found - create next variable struct */
2732 cur->next = xzalloc(sizeof(*cur));
2733 cur = cur->next;
2734
Denis Vlasenko28c0f0f2007-05-25 02:46:01 +00002735 set_str_and_exp:
2736 cur->varstr = str;
Denis Vlasenkod76c0492007-05-25 02:16:25 +00002737 exp:
Denis Vlasenkod76c0492007-05-25 02:16:25 +00002738 if (flg_export)
2739 cur->flg_export = 1;
2740 if (cur->flg_export)
Denis Vlasenko28c0f0f2007-05-25 02:46:01 +00002741 return putenv(cur->varstr);
Denis Vlasenkod76c0492007-05-25 02:16:25 +00002742 return 0;
Eric Andersen20a69a72001-05-15 17:24:44 +00002743}
2744
Eric Andersenf72f5622001-05-15 23:21:41 +00002745static void unset_local_var(const char *name)
Eric Andersen20a69a72001-05-15 17:24:44 +00002746{
Denis Vlasenkod76c0492007-05-25 02:16:25 +00002747 struct variable *cur;
2748 struct variable *prev = prev; /* for gcc */
2749 int name_len;
Eric Andersen20a69a72001-05-15 17:24:44 +00002750
Denis Vlasenko5f786c22007-04-20 08:35:45 +00002751 if (!name)
2752 return;
Denis Vlasenkod76c0492007-05-25 02:16:25 +00002753 name_len = strlen(name);
2754 cur = top_var;
2755 while (cur) {
Denis Vlasenko28c0f0f2007-05-25 02:46:01 +00002756 if (strncmp(cur->varstr, name, name_len) == 0 && cur->varstr[name_len] == '=') {
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002757 if (cur->flg_read_only) {
Manuel Novoa III cad53642003-03-19 09:13:01 +00002758 bb_error_msg("%s: readonly variable", name);
Eric Andersen94ac2442001-05-22 19:05:18 +00002759 return;
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00002760 }
Denis Vlasenkod76c0492007-05-25 02:16:25 +00002761 /* prev is ok to use here because 1st variable, HUSH_VERSION,
2762 * is ro, and we cannot reach this code on the 1st pass */
2763 prev->next = cur->next;
Denis Vlasenko28c0f0f2007-05-25 02:46:01 +00002764 unsetenv(cur->varstr);
Denis Vlasenkod76c0492007-05-25 02:16:25 +00002765 if (!cur->max_len)
Denis Vlasenko28c0f0f2007-05-25 02:46:01 +00002766 free(cur->varstr);
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00002767 free(cur);
Denis Vlasenko5f786c22007-04-20 08:35:45 +00002768 return;
Eric Andersenf72f5622001-05-15 23:21:41 +00002769 }
Denis Vlasenkod76c0492007-05-25 02:16:25 +00002770 prev = cur;
2771 cur = cur->next;
Eric Andersen20a69a72001-05-15 17:24:44 +00002772 }
Eric Andersen78a7c992001-05-15 16:30:25 +00002773}
2774
2775static int is_assignment(const char *s)
2776{
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002777 if (!s || !isalpha(*s))
2778 return 0;
2779 s++;
2780 while (isalnum(*s) || *s == '_')
2781 s++;
2782 return *s == '=';
Eric Andersen78a7c992001-05-15 16:30:25 +00002783}
2784
Eric Andersen25f27032001-04-26 23:22:31 +00002785/* the src parameter allows us to peek forward to a possible &n syntax
2786 * for file descriptor duplication, e.g., "2>&1".
2787 * Return code is 0 normally, 1 if a syntax error is detected in src.
2788 * Resource errors (in xmalloc) cause the process to exit */
2789static int setup_redirect(struct p_context *ctx, int fd, redir_type style,
2790 struct in_str *input)
2791{
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002792 struct child_prog *child = ctx->child;
Eric Andersen25f27032001-04-26 23:22:31 +00002793 struct redir_struct *redir = child->redirects;
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002794 struct redir_struct *last_redir = NULL;
Eric Andersen25f27032001-04-26 23:22:31 +00002795
2796 /* Create a new redir_struct and drop it onto the end of the linked list */
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002797 while (redir) {
2798 last_redir = redir;
2799 redir = redir->next;
Eric Andersen25f27032001-04-26 23:22:31 +00002800 }
2801 redir = xmalloc(sizeof(struct redir_struct));
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002802 redir->next = NULL;
2803 redir->word.gl_pathv = NULL;
Eric Andersen25f27032001-04-26 23:22:31 +00002804 if (last_redir) {
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002805 last_redir->next = redir;
Eric Andersen25f27032001-04-26 23:22:31 +00002806 } else {
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002807 child->redirects = redir;
Eric Andersen25f27032001-04-26 23:22:31 +00002808 }
2809
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002810 redir->type = style;
2811 redir->fd = (fd == -1) ? redir_table[style].default_fd : fd;
Eric Andersen25f27032001-04-26 23:22:31 +00002812
2813 debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip);
2814
Eric Andersenc7bda1c2004-03-15 08:29:22 +00002815 /* Check for a '2>&1' type redirect */
Eric Andersen25f27032001-04-26 23:22:31 +00002816 redir->dup = redirect_dup_num(input);
2817 if (redir->dup == -2) return 1; /* syntax error */
2818 if (redir->dup != -1) {
2819 /* Erik had a check here that the file descriptor in question
Eric Andersen83a2ae22001-05-07 17:59:25 +00002820 * is legit; I postpone that to "run time"
2821 * A "-" representation of "close me" shows up as a -3 here */
Eric Andersen25f27032001-04-26 23:22:31 +00002822 debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup);
2823 } else {
2824 /* We do _not_ try to open the file that src points to,
2825 * since we need to return and let src be expanded first.
2826 * Set ctx->pending_redirect, so we know what to do at the
Denis Vlasenko201c72a2007-05-25 10:00:36 +00002827 * end of the next parsed word. */
Eric Andersen25f27032001-04-26 23:22:31 +00002828 ctx->pending_redirect = redir;
2829 }
2830 return 0;
2831}
2832
Denis Vlasenkoac678ec2007-04-16 22:32:04 +00002833static struct pipe *new_pipe(void)
2834{
Eric Andersen25f27032001-04-26 23:22:31 +00002835 struct pipe *pi;
Denis Vlasenko3ac0e002007-04-28 16:45:22 +00002836 pi = xzalloc(sizeof(struct pipe));
2837 /*pi->num_progs = 0;*/
2838 /*pi->progs = NULL;*/
2839 /*pi->next = NULL;*/
2840 /*pi->followup = 0; invalid */
2841 if (RES_NONE)
Denis Vlasenko219e88d2007-05-21 10:18:23 +00002842 pi->res_word = RES_NONE;
Eric Andersen25f27032001-04-26 23:22:31 +00002843 return pi;
2844}
2845
2846static void initialize_context(struct p_context *ctx)
2847{
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002848 ctx->child = NULL;
Denis Vlasenko1a735862007-05-23 00:32:25 +00002849 ctx->pipe = ctx->list_head = new_pipe();
2850 ctx->pending_redirect = NULL;
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00002851 ctx->res_w = RES_NONE;
Denis Vlasenko1a735862007-05-23 00:32:25 +00002852 //only ctx->parse_type is not touched... is this intentional?
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002853 ctx->old_flag = 0;
Denis Vlasenko1a735862007-05-23 00:32:25 +00002854 ctx->stack = NULL;
Eric Andersen25f27032001-04-26 23:22:31 +00002855 done_command(ctx); /* creates the memory for working child */
2856}
2857
2858/* normal return is 0
2859 * if a reserved word is found, and processed, return 1
2860 * should handle if, then, elif, else, fi, for, while, until, do, done.
2861 * case, function, and select are obnoxious, save those for later.
2862 */
Denis Vlasenko06810332007-05-21 23:30:54 +00002863#if ENABLE_HUSH_IF || ENABLE_HUSH_LOOPS
"Vladimir N. Oleynik"19c37012005-09-22 14:33:15 +00002864static int reserved_word(o_string *dest, struct p_context *ctx)
Eric Andersen25f27032001-04-26 23:22:31 +00002865{
2866 struct reserved_combo {
Denis Vlasenko5f786c22007-04-20 08:35:45 +00002867 char literal[7];
2868 unsigned char code;
2869 int flag;
Eric Andersen25f27032001-04-26 23:22:31 +00002870 };
2871 /* Mostly a list of accepted follow-up reserved words.
2872 * FLAG_END means we are done with the sequence, and are ready
2873 * to turn the compound list into a command.
2874 * FLAG_START means the word must start a new compound list.
2875 */
Denis Vlasenkoc72c1ed2007-01-30 22:31:26 +00002876 static const struct reserved_combo reserved_list[] = {
Denis Vlasenko06810332007-05-21 23:30:54 +00002877#if ENABLE_HUSH_IF
Eric Andersen25f27032001-04-26 23:22:31 +00002878 { "if", RES_IF, FLAG_THEN | FLAG_START },
2879 { "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI },
2880 { "elif", RES_ELIF, FLAG_THEN },
2881 { "else", RES_ELSE, FLAG_FI },
2882 { "fi", RES_FI, FLAG_END },
Denis Vlasenko06810332007-05-21 23:30:54 +00002883#endif
2884#if ENABLE_HUSH_LOOPS
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002885 { "for", RES_FOR, FLAG_IN | FLAG_START },
Eric Andersen25f27032001-04-26 23:22:31 +00002886 { "while", RES_WHILE, FLAG_DO | FLAG_START },
2887 { "until", RES_UNTIL, FLAG_DO | FLAG_START },
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002888 { "in", RES_IN, FLAG_DO },
Eric Andersen25f27032001-04-26 23:22:31 +00002889 { "do", RES_DO, FLAG_DONE },
2890 { "done", RES_DONE, FLAG_END }
Denis Vlasenko06810332007-05-21 23:30:54 +00002891#endif
Eric Andersen25f27032001-04-26 23:22:31 +00002892 };
Denis Vlasenko80b8b392007-06-25 10:55:35 +00002893
Denis Vlasenkoc72c1ed2007-01-30 22:31:26 +00002894 const struct reserved_combo *r;
Denis Vlasenkoc72c1ed2007-01-30 22:31:26 +00002895
Denis Vlasenko80b8b392007-06-25 10:55:35 +00002896 for (r = reserved_list; r < reserved_list + ARRAY_SIZE(reserved_list); r++) {
Denis Vlasenko1a735862007-05-23 00:32:25 +00002897 if (strcmp(dest->data, r->literal) != 0)
2898 continue;
2899 debug_printf("found reserved word %s, code %d\n", r->literal, r->code);
2900 if (r->flag & FLAG_START) {
2901 struct p_context *new;
2902 debug_printf("push stack\n");
Denis Vlasenko06810332007-05-21 23:30:54 +00002903#if ENABLE_HUSH_LOOPS
Denis Vlasenko1a735862007-05-23 00:32:25 +00002904 if (ctx->res_w == RES_IN || ctx->res_w == RES_FOR) {
Denis Vlasenko90e485c2007-05-23 15:22:50 +00002905 syntax("malformed for"); /* example: 'for if' */
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00002906 ctx->res_w = RES_SNTX;
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002907 b_reset(dest);
Eric Andersenaf44a0e2001-04-27 07:26:12 +00002908 return 1;
Eric Andersen25f27032001-04-26 23:22:31 +00002909 }
Denis Vlasenko1a735862007-05-23 00:32:25 +00002910#endif
2911 new = xmalloc(sizeof(*new));
2912 *new = *ctx; /* physical copy */
2913 initialize_context(ctx);
2914 ctx->stack = new;
2915 } else if (ctx->res_w == RES_NONE || !(ctx->old_flag & (1 << r->code))) {
Denis Vlasenko90e485c2007-05-23 15:22:50 +00002916 syntax(NULL);
Denis Vlasenko1a735862007-05-23 00:32:25 +00002917 ctx->res_w = RES_SNTX;
Denis Vlasenkoff131b92007-04-10 15:42:06 +00002918 b_reset(dest);
Eric Andersen25f27032001-04-26 23:22:31 +00002919 return 1;
2920 }
Denis Vlasenko1a735862007-05-23 00:32:25 +00002921 ctx->res_w = r->code;
2922 ctx->old_flag = r->flag;
2923 if (ctx->old_flag & FLAG_END) {
2924 struct p_context *old;
2925 debug_printf("pop stack\n");
2926 done_pipe(ctx, PIPE_SEQ);
2927 old = ctx->stack;
2928 old->child->group = ctx->list_head;
2929 old->child->subshell = 0;
2930 *ctx = *old; /* physical copy */
2931 free(old);
2932 }
2933 b_reset(dest);
2934 return 1;
Eric Andersen25f27032001-04-26 23:22:31 +00002935 }
2936 return 0;
2937}
Denis Vlasenko06810332007-05-21 23:30:54 +00002938#else
2939#define reserved_word(dest, ctx) ((int)0)
2940#endif
Eric Andersen25f27032001-04-26 23:22:31 +00002941
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00002942/* Normal return is 0.
Eric Andersen25f27032001-04-26 23:22:31 +00002943 * Syntax or xglob errors return 1. */
2944static int done_word(o_string *dest, struct p_context *ctx)
2945{
Denis Vlasenkobb81c582007-01-30 22:32:09 +00002946 struct child_prog *child = ctx->child;
Eric Andersen25f27032001-04-26 23:22:31 +00002947 glob_t *glob_target;
2948 int gr, flags = 0;
2949
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00002950 debug_printf_parse("done_word entered: '%s' %p\n", dest->data, child);
Eric Andersen25f27032001-04-26 23:22:31 +00002951 if (dest->length == 0 && !dest->nonnull) {
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00002952 debug_printf_parse("done_word return 0: true null, ignored\n");
Eric Andersen25f27032001-04-26 23:22:31 +00002953 return 0;
2954 }
2955 if (ctx->pending_redirect) {
2956 glob_target = &ctx->pending_redirect->word;
2957 } else {
2958 if (child->group) {
Denis Vlasenko90e485c2007-05-23 15:22:50 +00002959 syntax(NULL);
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00002960 debug_printf_parse("done_word return 1: syntax error, groups and arglists don't mix\n");
2961 return 1;
Eric Andersen25f27032001-04-26 23:22:31 +00002962 }
Denis Vlasenko219e88d2007-05-21 10:18:23 +00002963 if (!child->argv && (ctx->parse_type & PARSEFLAG_SEMICOLON)) {
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00002964 debug_printf_parse(": checking '%s' for reserved-ness\n", dest->data);
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00002965 if (reserved_word(dest, ctx)) {
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00002966 debug_printf_parse("done_word return %d\n", (ctx->res_w == RES_SNTX));
2967 return (ctx->res_w == RES_SNTX);
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00002968 }
Eric Andersen25f27032001-04-26 23:22:31 +00002969 }
2970 glob_target = &child->glob_result;
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00002971 if (child->argv)
2972 flags |= GLOB_APPEND;
Eric Andersen25f27032001-04-26 23:22:31 +00002973 }
2974 gr = xglob(dest, flags, glob_target);
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00002975 if (gr != 0) {
2976 debug_printf_parse("done_word return 1: xglob returned %d\n", gr);
2977 return 1;
2978 }
Eric Andersen25f27032001-04-26 23:22:31 +00002979
2980 b_reset(dest);
2981 if (ctx->pending_redirect) {
Denis Vlasenkobb81c582007-01-30 22:32:09 +00002982 ctx->pending_redirect = NULL;
Eric Andersen25f27032001-04-26 23:22:31 +00002983 if (glob_target->gl_pathc != 1) {
Manuel Novoa III cad53642003-03-19 09:13:01 +00002984 bb_error_msg("ambiguous redirect");
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00002985 debug_printf_parse("done_word return 1: ambiguous redirect\n");
Eric Andersen25f27032001-04-26 23:22:31 +00002986 return 1;
2987 }
2988 } else {
2989 child->argv = glob_target->gl_pathv;
2990 }
Denis Vlasenko06810332007-05-21 23:30:54 +00002991#if ENABLE_HUSH_LOOPS
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00002992 if (ctx->res_w == RES_FOR) {
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00002993 done_word(dest, ctx);
2994 done_pipe(ctx, PIPE_SEQ);
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002995 }
Denis Vlasenko06810332007-05-21 23:30:54 +00002996#endif
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00002997 debug_printf_parse("done_word return 0\n");
Eric Andersen25f27032001-04-26 23:22:31 +00002998 return 0;
2999}
3000
3001/* The only possible error here is out of memory, in which case
3002 * xmalloc exits. */
3003static int done_command(struct p_context *ctx)
3004{
3005 /* The child is really already in the pipe structure, so
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00003006 * advance the pipe counter and make a new, null child. */
Denis Vlasenkobb81c582007-01-30 22:32:09 +00003007 struct pipe *pi = ctx->pipe;
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00003008 struct child_prog *child = ctx->child;
Eric Andersen25f27032001-04-26 23:22:31 +00003009
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00003010 if (child) {
3011 if (child->group == NULL
3012 && child->argv == NULL
3013 && child->redirects == NULL
3014 ) {
Denis Vlasenkodd4cb2b2007-05-05 15:11:40 +00003015 debug_printf_parse("done_command: skipping null cmd, num_progs=%d\n", pi->num_progs);
3016 return pi->num_progs;
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00003017 }
Eric Andersen25f27032001-04-26 23:22:31 +00003018 pi->num_progs++;
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00003019 debug_printf_parse("done_command: ++num_progs=%d\n", pi->num_progs);
Eric Andersen25f27032001-04-26 23:22:31 +00003020 } else {
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00003021 debug_printf_parse("done_command: initializing, num_progs=%d\n", pi->num_progs);
Eric Andersen25f27032001-04-26 23:22:31 +00003022 }
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00003023
3024 /* Only real trickiness here is that the uncommitted
3025 * child structure is not counted in pi->num_progs. */
Eric Andersen25f27032001-04-26 23:22:31 +00003026 pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1));
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00003027 child = &pi->progs[pi->num_progs];
Eric Andersen25f27032001-04-26 23:22:31 +00003028
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00003029 memset(child, 0, sizeof(*child));
3030 /*child->redirects = NULL;*/
3031 /*child->argv = NULL;*/
3032 /*child->is_stopped = 0;*/
3033 /*child->group = NULL;*/
3034 /*child->glob_result.gl_pathv = NULL;*/
3035 child->family = pi;
Denis Vlasenkoc666f712007-05-16 22:18:54 +00003036 //sp: /*child->sp = 0;*/
Denis Vlasenko262d7652007-05-20 21:52:49 +00003037 //pt: child->parse_type = ctx->parse_type;
Eric Andersen25f27032001-04-26 23:22:31 +00003038
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00003039 ctx->child = child;
Eric Andersen25f27032001-04-26 23:22:31 +00003040 /* but ctx->pipe and ctx->list_head remain unchanged */
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00003041
Denis Vlasenkodd4cb2b2007-05-05 15:11:40 +00003042 return pi->num_progs; /* used only for 0/nonzero check */
Eric Andersen25f27032001-04-26 23:22:31 +00003043}
3044
3045static int done_pipe(struct p_context *ctx, pipe_style type)
3046{
3047 struct pipe *new_p;
Denis Vlasenkodd4cb2b2007-05-05 15:11:40 +00003048 int not_null;
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00003049
3050 debug_printf_parse("done_pipe entered, followup %d\n", type);
Denis Vlasenkodd4cb2b2007-05-05 15:11:40 +00003051 not_null = done_command(ctx); /* implicit closure of previous command */
Eric Andersen25f27032001-04-26 23:22:31 +00003052 ctx->pipe->followup = type;
Denis Vlasenko219e88d2007-05-21 10:18:23 +00003053 ctx->pipe->res_word = ctx->res_w;
Denis Vlasenkodd4cb2b2007-05-05 15:11:40 +00003054 /* Without this check, even just <enter> on command line generates
3055 * tree of three NOPs (!). Which is harmless but annoying.
3056 * IOW: it is safe to do it unconditionally. */
3057 if (not_null) {
3058 new_p = new_pipe();
3059 ctx->pipe->next = new_p;
3060 ctx->pipe = new_p;
3061 ctx->child = NULL;
3062 done_command(ctx); /* set up new pipe to accept commands */
3063 }
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00003064 debug_printf_parse("done_pipe return 0\n");
Eric Andersen25f27032001-04-26 23:22:31 +00003065 return 0;
3066}
3067
3068/* peek ahead in the in_str to find out if we have a "&n" construct,
3069 * as in "2>&1", that represents duplicating a file descriptor.
3070 * returns either -2 (syntax error), -1 (no &), or the number found.
3071 */
3072static int redirect_dup_num(struct in_str *input)
3073{
Denis Vlasenkobb81c582007-01-30 22:32:09 +00003074 int ch, d = 0, ok = 0;
Eric Andersen25f27032001-04-26 23:22:31 +00003075 ch = b_peek(input);
3076 if (ch != '&') return -1;
3077
3078 b_getch(input); /* get the & */
Denis Vlasenkobb81c582007-01-30 22:32:09 +00003079 ch = b_peek(input);
Eric Andersen83a2ae22001-05-07 17:59:25 +00003080 if (ch == '-') {
3081 b_getch(input);
3082 return -3; /* "-" represents "close me" */
3083 }
3084 while (isdigit(ch)) {
Denis Vlasenko7d4c44e2007-04-16 22:34:39 +00003085 d = d*10 + (ch-'0');
Denis Vlasenkobb81c582007-01-30 22:32:09 +00003086 ok = 1;
Eric Andersen25f27032001-04-26 23:22:31 +00003087 b_getch(input);
Eric Andersen83a2ae22001-05-07 17:59:25 +00003088 ch = b_peek(input);
Eric Andersen25f27032001-04-26 23:22:31 +00003089 }
3090 if (ok) return d;
3091
Manuel Novoa III cad53642003-03-19 09:13:01 +00003092 bb_error_msg("ambiguous redirect");
Eric Andersen25f27032001-04-26 23:22:31 +00003093 return -2;
3094}
3095
3096/* If a redirect is immediately preceded by a number, that number is
3097 * supposed to tell which file descriptor to redirect. This routine
3098 * looks for such preceding numbers. In an ideal world this routine
3099 * needs to handle all the following classes of redirects...
3100 * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo
3101 * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo
3102 * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo
3103 * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo
3104 * A -1 output from this program means no valid number was found, so the
3105 * caller should use the appropriate default for this redirection.
3106 */
3107static int redirect_opt_num(o_string *o)
3108{
3109 int num;
3110
Denis Vlasenkobb81c582007-01-30 22:32:09 +00003111 if (o->length == 0)
3112 return -1;
3113 for (num = 0; num < o->length; num++) {
3114 if (!isdigit(*(o->data + num))) {
Eric Andersen25f27032001-04-26 23:22:31 +00003115 return -1;
3116 }
3117 }
3118 /* reuse num (and save an int) */
Denis Vlasenkobb81c582007-01-30 22:32:09 +00003119 num = atoi(o->data);
Eric Andersen25f27032001-04-26 23:22:31 +00003120 b_reset(o);
3121 return num;
3122}
3123
Denis Vlasenko14b5dd92007-05-20 21:51:38 +00003124#if ENABLE_HUSH_TICK
"Vladimir N. Oleynik"19c37012005-09-22 14:33:15 +00003125static FILE *generate_stream_from_list(struct pipe *head)
Eric Andersen25f27032001-04-26 23:22:31 +00003126{
3127 FILE *pf;
Eric Andersen25f27032001-04-26 23:22:31 +00003128 int pid, channel[2];
Denis Vlasenkoba7cf262007-05-25 14:34:30 +00003129
Denis Vlasenko5a6aedd2007-05-26 16:44:20 +00003130 xpipe(channel);
Denis Vlasenkof03dbed2007-04-13 19:55:50 +00003131#if BB_MMU
Denis Vlasenkobb81c582007-01-30 22:32:09 +00003132 pid = fork();
Eric Andersen72f9a422001-10-28 05:12:20 +00003133#else
Denis Vlasenkobb81c582007-01-30 22:32:09 +00003134 pid = vfork();
Eric Andersen72f9a422001-10-28 05:12:20 +00003135#endif
Denis Vlasenkobb81c582007-01-30 22:32:09 +00003136 if (pid < 0) {
Manuel Novoa III cad53642003-03-19 09:13:01 +00003137 bb_perror_msg_and_die("fork");
Denis Vlasenkobb81c582007-01-30 22:32:09 +00003138 } else if (pid == 0) {
Eric Andersen25f27032001-04-26 23:22:31 +00003139 close(channel[0]);
3140 if (channel[1] != 1) {
Denis Vlasenko7d4c44e2007-04-16 22:34:39 +00003141 dup2(channel[1], 1);
Eric Andersen25f27032001-04-26 23:22:31 +00003142 close(channel[1]);
3143 }
Denis Vlasenkoba7cf262007-05-25 14:34:30 +00003144 /* Prevent it from trying to handle ctrl-z etc */
Denis Vlasenko27f79ff2007-05-30 00:55:52 +00003145#if ENABLE_HUSH_JOB
Denis Vlasenkoba7cf262007-05-25 14:34:30 +00003146 run_list_level = 1;
Denis Vlasenko27f79ff2007-05-30 00:55:52 +00003147#endif
Denis Vlasenkoba7cf262007-05-25 14:34:30 +00003148 /* Process substitution is not considered to be usual
3149 * 'command execution'.
3150 * SUSv3 says ctrl-Z should be ignored, ctrl-C should not. */
3151 /* Not needed, we are relying on it being disabled
3152 * everywhere outside actual command execution. */
3153 /*set_jobctrl_sighandler(SIG_IGN);*/
3154 set_misc_sighandler(SIG_DFL);
Eric Andersen94ac2442001-05-22 19:05:18 +00003155 _exit(run_list_real(head)); /* leaks memory */
Eric Andersen25f27032001-04-26 23:22:31 +00003156 }
Eric Andersen25f27032001-04-26 23:22:31 +00003157 close(channel[1]);
Denis Vlasenko5f786c22007-04-20 08:35:45 +00003158 pf = fdopen(channel[0], "r");
Eric Andersen25f27032001-04-26 23:22:31 +00003159 return pf;
3160}
3161
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00003162/* Return code is exit status of the process that is run. */
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00003163static int process_command_subs(o_string *dest, struct p_context *ctx,
3164 struct in_str *input, const char *subst_end)
Eric Andersen25f27032001-04-26 23:22:31 +00003165{
Denis Vlasenko3e9aaae2007-05-11 12:56:43 +00003166 int retcode, ch, eol_cnt;
Denis Vlasenkobb81c582007-01-30 22:32:09 +00003167 o_string result = NULL_O_STRING;
Eric Andersen25f27032001-04-26 23:22:31 +00003168 struct p_context inner;
3169 FILE *p;
3170 struct in_str pipe_str;
Denis Vlasenko3e9aaae2007-05-11 12:56:43 +00003171
Eric Andersen25f27032001-04-26 23:22:31 +00003172 initialize_context(&inner);
3173
3174 /* recursion to generate command */
3175 retcode = parse_stream(&result, &inner, input, subst_end);
Denis Vlasenko1a735862007-05-23 00:32:25 +00003176 if (retcode != 0)
3177 return retcode; /* syntax error or EOF */
Eric Andersen25f27032001-04-26 23:22:31 +00003178 done_word(&result, &inner);
3179 done_pipe(&inner, PIPE_SEQ);
3180 b_free(&result);
3181
Denis Vlasenkobb81c582007-01-30 22:32:09 +00003182 p = generate_stream_from_list(inner.list_head);
3183 if (p == NULL) return 1;
Eric Andersen25f27032001-04-26 23:22:31 +00003184 mark_open(fileno(p));
3185 setup_file_in_str(&pipe_str, p);
3186
3187 /* now send results of command back into original context */
Denis Vlasenko3e9aaae2007-05-11 12:56:43 +00003188 eol_cnt = 0;
3189 while ((ch = b_getch(&pipe_str)) != EOF) {
3190 if (ch == '\n') {
3191 eol_cnt++;
3192 continue;
3193 }
3194 while (eol_cnt) {
3195 b_addqchr(dest, '\n', dest->quote);
3196 eol_cnt--;
3197 }
3198 b_addqchr(dest, ch, dest->quote);
Eric Andersen25f27032001-04-26 23:22:31 +00003199 }
3200
3201 debug_printf("done reading from pipe, pclose()ing\n");
3202 /* This is the step that wait()s for the child. Should be pretty
3203 * safe, since we just read an EOF from its stdout. We could try
Denis Vlasenko262d7652007-05-20 21:52:49 +00003204 * to do better, by using wait(), and keeping track of background jobs
Eric Andersen25f27032001-04-26 23:22:31 +00003205 * at the same time. That would be a lot of work, and contrary
3206 * to the KISS philosophy of this program. */
3207 mark_closed(fileno(p));
Denis Vlasenkoba7cf262007-05-25 14:34:30 +00003208 retcode = fclose(p);
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00003209 free_pipe_list(inner.list_head, 0);
Denis Vlasenkoba7cf262007-05-25 14:34:30 +00003210 debug_printf("closed FILE from child, retcode=%d\n", retcode);
Eric Andersen25f27032001-04-26 23:22:31 +00003211 return retcode;
3212}
Denis Vlasenko14b5dd92007-05-20 21:51:38 +00003213#endif
Eric Andersen25f27032001-04-26 23:22:31 +00003214
3215static int parse_group(o_string *dest, struct p_context *ctx,
3216 struct in_str *input, int ch)
3217{
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00003218 int rcode;
3219 const char *endch = NULL;
Eric Andersen25f27032001-04-26 23:22:31 +00003220 struct p_context sub;
3221 struct child_prog *child = ctx->child;
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00003222
3223 debug_printf_parse("parse_group entered\n");
Eric Andersen25f27032001-04-26 23:22:31 +00003224 if (child->argv) {
Denis Vlasenko90e485c2007-05-23 15:22:50 +00003225 syntax(NULL);
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00003226 debug_printf_parse("parse_group return 1: syntax error, groups and arglists don't mix\n");
3227 return 1;
Eric Andersen25f27032001-04-26 23:22:31 +00003228 }
3229 initialize_context(&sub);
Denis Vlasenko90e485c2007-05-23 15:22:50 +00003230 endch = "}";
3231 if (ch == '(') {
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00003232 endch = ")";
Denis Vlasenkobb81c582007-01-30 22:32:09 +00003233 child->subshell = 1;
Eric Andersen25f27032001-04-26 23:22:31 +00003234 }
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00003235 rcode = parse_stream(dest, &sub, input, endch);
Denis Vlasenko5a1437d2007-05-24 13:22:47 +00003236//vda: err chk?
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00003237 done_word(dest, &sub); /* finish off the final word in the subcontext */
Eric Andersen25f27032001-04-26 23:22:31 +00003238 done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */
3239 child->group = sub.list_head;
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00003240
3241 debug_printf_parse("parse_group return %d\n", rcode);
Eric Andersen25f27032001-04-26 23:22:31 +00003242 return rcode;
3243 /* child remains "open", available for possible redirects */
3244}
3245
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00003246/* Basically useful version until someone wants to get fancier,
Eric Andersen25f27032001-04-26 23:22:31 +00003247 * see the bash man page under "Parameter Expansion" */
Denis Vlasenko15d78fb2007-01-30 22:28:21 +00003248static const char *lookup_param(const char *src)
Eric Andersen25f27032001-04-26 23:22:31 +00003249{
Denis Vlasenkod76c0492007-05-25 02:16:25 +00003250 struct variable *var = get_local_var(src);
3251 if (var)
Denis Vlasenko28c0f0f2007-05-25 02:46:01 +00003252 return strchr(var->varstr, '=') + 1;
Denis Vlasenkod76c0492007-05-25 02:16:25 +00003253 return NULL;
Eric Andersen25f27032001-04-26 23:22:31 +00003254}
3255
3256/* return code: 0 for OK, 1 for syntax error */
3257static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input)
3258{
Denis Vlasenko602d13c2007-05-13 18:34:53 +00003259 int ch = b_peek(input); /* first character after the $ */
Denis Vlasenko1f4cf512007-05-16 10:39:24 +00003260 unsigned char quote_mask = dest->quote ? 0x80 : 0;
Denis Vlasenkoe0a33672007-05-10 23:06:55 +00003261
3262 debug_printf_parse("handle_dollar entered: ch='%c'\n", ch);
Denis Vlasenko1f4cf512007-05-16 10:39:24 +00003263 if (isalpha(ch)) {
Eric Andersen4c9b68f2002-04-13 12:33:41 +00003264 b_addchr(dest, SPECIAL_VAR_SYMBOL);
Denis Vlasenkoc666f712007-05-16 22:18:54 +00003265 //sp: ctx->child->sp++;
Denis Vlasenkoe0a33672007-05-10 23:06:55 +00003266 while (1) {
Denis Vlasenkoe0a33672007-05-10 23:06:55 +00003267 debug_printf_parse(": '%c'\n", ch);
Eric Andersen25f27032001-04-26 23:22:31 +00003268 b_getch(input);
Denis Vlasenko1f4cf512007-05-16 10:39:24 +00003269 b_addchr(dest, ch | quote_mask);
3270 quote_mask = 0;
Denis Vlasenko602d13c2007-05-13 18:34:53 +00003271 ch = b_peek(input);
3272 if (!isalnum(ch) && ch != '_')
3273 break;
Eric Andersen25f27032001-04-26 23:22:31 +00003274 }
Eric Andersen4c9b68f2002-04-13 12:33:41 +00003275 b_addchr(dest, SPECIAL_VAR_SYMBOL);
Eric Andersen25f27032001-04-26 23:22:31 +00003276 } else if (isdigit(ch)) {
Denis Vlasenko602d13c2007-05-13 18:34:53 +00003277 make_one_char_var:
3278 b_addchr(dest, SPECIAL_VAR_SYMBOL);
Denis Vlasenkoc666f712007-05-16 22:18:54 +00003279 //sp: ctx->child->sp++;
Denis Vlasenko602d13c2007-05-13 18:34:53 +00003280 debug_printf_parse(": '%c'\n", ch);
3281 b_getch(input);
Denis Vlasenko1f4cf512007-05-16 10:39:24 +00003282 b_addchr(dest, ch | quote_mask);
Denis Vlasenko602d13c2007-05-13 18:34:53 +00003283 b_addchr(dest, SPECIAL_VAR_SYMBOL);
Eric Andersen25f27032001-04-26 23:22:31 +00003284 } else switch (ch) {
Denis Vlasenko602d13c2007-05-13 18:34:53 +00003285 case '$': /* pid */
3286 case '!': /* last bg pid */
3287 case '?': /* last exit code */
3288 case '#': /* number of args */
3289 case '*': /* args */
3290 case '@': /* args */
3291 goto make_one_char_var;
Eric Andersen25f27032001-04-26 23:22:31 +00003292 case '{':
Eric Andersen4c9b68f2002-04-13 12:33:41 +00003293 b_addchr(dest, SPECIAL_VAR_SYMBOL);
Denis Vlasenkoc666f712007-05-16 22:18:54 +00003294 //sp: ctx->child->sp++;
Eric Andersen25f27032001-04-26 23:22:31 +00003295 b_getch(input);
3296 /* XXX maybe someone will try to escape the '}' */
Denis Vlasenkobb81c582007-01-30 22:32:09 +00003297 while (1) {
3298 ch = b_getch(input);
Denis Vlasenkob0550012007-05-24 12:18:16 +00003299 if (ch == '}')
3300 break;
3301 if (!isalnum(ch) && ch != '_') {
Denis Vlasenko90e485c2007-05-23 15:22:50 +00003302 syntax("unterminated ${name}");
Denis Vlasenkoe0a33672007-05-10 23:06:55 +00003303 debug_printf_parse("handle_dollar return 1: unterminated ${name}\n");
3304 return 1;
3305 }
Denis Vlasenkoe0a33672007-05-10 23:06:55 +00003306 debug_printf_parse(": '%c'\n", ch);
Denis Vlasenko1f4cf512007-05-16 10:39:24 +00003307 b_addchr(dest, ch | quote_mask);
3308 quote_mask = 0;
Eric Andersen25f27032001-04-26 23:22:31 +00003309 }
Eric Andersen4c9b68f2002-04-13 12:33:41 +00003310 b_addchr(dest, SPECIAL_VAR_SYMBOL);
Eric Andersen25f27032001-04-26 23:22:31 +00003311 break;
Denis Vlasenko14b5dd92007-05-20 21:51:38 +00003312#if ENABLE_HUSH_TICK
Eric Andersen25f27032001-04-26 23:22:31 +00003313 case '(':
Matt Kraai9f8caf12001-05-02 16:26:12 +00003314 b_getch(input);
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00003315 process_command_subs(dest, ctx, input, ")");
Eric Andersen25f27032001-04-26 23:22:31 +00003316 break;
Denis Vlasenko14b5dd92007-05-20 21:51:38 +00003317#endif
Eric Andersen25f27032001-04-26 23:22:31 +00003318 case '-':
3319 case '_':
3320 /* still unhandled, but should be eventually */
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00003321 bb_error_msg("unhandled syntax: $%c", ch);
Eric Andersen25f27032001-04-26 23:22:31 +00003322 return 1;
3323 break;
3324 default:
Denis Vlasenko602d13c2007-05-13 18:34:53 +00003325 b_addqchr(dest, '$', dest->quote);
Eric Andersen25f27032001-04-26 23:22:31 +00003326 }
Denis Vlasenkoe0a33672007-05-10 23:06:55 +00003327 debug_printf_parse("handle_dollar return 0\n");
Eric Andersen25f27032001-04-26 23:22:31 +00003328 return 0;
3329}
3330
Eric Andersen25f27032001-04-26 23:22:31 +00003331/* return code is 0 for normal exit, 1 for syntax error */
Denis Vlasenko5f786c22007-04-20 08:35:45 +00003332static int parse_stream(o_string *dest, struct p_context *ctx,
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00003333 struct in_str *input, const char *end_trigger)
Eric Andersen25f27032001-04-26 23:22:31 +00003334{
"Vladimir N. Oleynik"4ccd2b42006-01-31 09:27:48 +00003335 int ch, m;
Eric Andersen25f27032001-04-26 23:22:31 +00003336 int redir_fd;
3337 redir_type redir_style;
3338 int next;
3339
3340 /* Only double-quote state is handled in the state variable dest->quote.
3341 * A single-quote triggers a bypass of the main loop until its mate is
3342 * found. When recursing, quote state is passed in via dest->quote. */
3343
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00003344 debug_printf_parse("parse_stream entered, end_trigger='%s'\n", end_trigger);
3345
Denis Vlasenko1a735862007-05-23 00:32:25 +00003346 while (1) {
Denis Vlasenko1a735862007-05-23 00:32:25 +00003347 m = CHAR_IFS;
3348 next = '\0';
Denis Vlasenko170435c2007-05-23 13:01:10 +00003349 ch = b_getch(input);
Denis Vlasenko1a735862007-05-23 00:32:25 +00003350 if (ch != EOF) {
3351 m = charmap[ch];
3352 if (ch != '\n')
3353 next = b_peek(input);
3354 }
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00003355 debug_printf_parse(": ch=%c (%d) m=%d quote=%d\n",
Denis Vlasenkobb81c582007-01-30 22:32:09 +00003356 ch, ch, m, dest->quote);
Denis Vlasenko8f6bdb42007-05-16 09:36:55 +00003357 if (m == CHAR_ORDINARY
3358 || (m != CHAR_SPECIAL && dest->quote)
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00003359 ) {
Denis Vlasenko170435c2007-05-23 13:01:10 +00003360 if (ch == EOF) {
Denis Vlasenko90e485c2007-05-23 15:22:50 +00003361 syntax("unterminated \"");
Denis Vlasenko170435c2007-05-23 13:01:10 +00003362 debug_printf_parse("parse_stream return 1: unterminated \"\n");
3363 return 1;
3364 }
Eric Andersen25f27032001-04-26 23:22:31 +00003365 b_addqchr(dest, ch, dest->quote);
Denis Vlasenkobb81c582007-01-30 22:32:09 +00003366 continue;
3367 }
Denis Vlasenko8f6bdb42007-05-16 09:36:55 +00003368 if (m == CHAR_IFS) {
Denis Vlasenkobb81c582007-01-30 22:32:09 +00003369 if (done_word(dest, ctx)) {
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00003370 debug_printf_parse("parse_stream return 1: done_word!=0\n");
Denis Vlasenkobb81c582007-01-30 22:32:09 +00003371 return 1;
Eric Andersenaac75e52001-04-30 18:18:45 +00003372 }
Denis Vlasenko1a735862007-05-23 00:32:25 +00003373 if (ch == EOF)
3374 break;
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00003375 /* If we aren't performing a substitution, treat
3376 * a newline as a command separator.
3377 * [why we don't handle it exactly like ';'? --vda] */
3378 if (end_trigger && ch == '\n') {
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00003379 done_pipe(ctx, PIPE_SEQ);
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00003380 }
Denis Vlasenkobb81c582007-01-30 22:32:09 +00003381 }
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00003382 if ((end_trigger && strchr(end_trigger, ch))
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00003383 && !dest->quote && ctx->res_w == RES_NONE
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00003384 ) {
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00003385 debug_printf_parse("parse_stream return 0: end_trigger char found\n");
Denis Vlasenkobb81c582007-01-30 22:32:09 +00003386 return 0;
3387 }
Denis Vlasenko8f6bdb42007-05-16 09:36:55 +00003388 if (m == CHAR_IFS)
Denis Vlasenkobb81c582007-01-30 22:32:09 +00003389 continue;
3390 switch (ch) {
Eric Andersen25f27032001-04-26 23:22:31 +00003391 case '#':
3392 if (dest->length == 0 && !dest->quote) {
Denis Vlasenko0c886c62007-01-30 22:30:09 +00003393 while (1) {
3394 ch = b_peek(input);
3395 if (ch == EOF || ch == '\n')
3396 break;
3397 b_getch(input);
3398 }
Eric Andersen25f27032001-04-26 23:22:31 +00003399 } else {
3400 b_addqchr(dest, ch, dest->quote);
3401 }
3402 break;
3403 case '\\':
3404 if (next == EOF) {
Denis Vlasenko90e485c2007-05-23 15:22:50 +00003405 syntax("\\<eof>");
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00003406 debug_printf_parse("parse_stream return 1: \\<eof>\n");
Eric Andersen25f27032001-04-26 23:22:31 +00003407 return 1;
3408 }
3409 b_addqchr(dest, '\\', dest->quote);
3410 b_addqchr(dest, b_getch(input), dest->quote);
3411 break;
3412 case '$':
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00003413 if (handle_dollar(dest, ctx, input) != 0) {
3414 debug_printf_parse("parse_stream return 1: handle_dollar returned non-0\n");
3415 return 1;
3416 }
Eric Andersen25f27032001-04-26 23:22:31 +00003417 break;
3418 case '\'':
3419 dest->nonnull = 1;
Denis Vlasenko0c886c62007-01-30 22:30:09 +00003420 while (1) {
3421 ch = b_getch(input);
3422 if (ch == EOF || ch == '\'')
3423 break;
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00003424 b_addchr(dest, ch);
Eric Andersen25f27032001-04-26 23:22:31 +00003425 }
Denis Vlasenko0c886c62007-01-30 22:30:09 +00003426 if (ch == EOF) {
Denis Vlasenko90e485c2007-05-23 15:22:50 +00003427 syntax("unterminated '");
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00003428 debug_printf_parse("parse_stream return 1: unterminated '\n");
Eric Andersen25f27032001-04-26 23:22:31 +00003429 return 1;
3430 }
3431 break;
3432 case '"':
3433 dest->nonnull = 1;
3434 dest->quote = !dest->quote;
3435 break;
Denis Vlasenko14b5dd92007-05-20 21:51:38 +00003436#if ENABLE_HUSH_TICK
Eric Andersen25f27032001-04-26 23:22:31 +00003437 case '`':
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00003438 process_command_subs(dest, ctx, input, "`");
Eric Andersen25f27032001-04-26 23:22:31 +00003439 break;
Denis Vlasenko14b5dd92007-05-20 21:51:38 +00003440#endif
Eric Andersen25f27032001-04-26 23:22:31 +00003441 case '>':
3442 redir_fd = redirect_opt_num(dest);
3443 done_word(dest, ctx);
Denis Vlasenkobb81c582007-01-30 22:32:09 +00003444 redir_style = REDIRECT_OVERWRITE;
Eric Andersen25f27032001-04-26 23:22:31 +00003445 if (next == '>') {
Denis Vlasenkobb81c582007-01-30 22:32:09 +00003446 redir_style = REDIRECT_APPEND;
Eric Andersen25f27032001-04-26 23:22:31 +00003447 b_getch(input);
Denis Vlasenko90e485c2007-05-23 15:22:50 +00003448 }
3449#if 0
3450 else if (next == '(') {
3451 syntax(">(process) not supported");
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00003452 debug_printf_parse("parse_stream return 1: >(process) not supported\n");
Eric Andersen25f27032001-04-26 23:22:31 +00003453 return 1;
3454 }
Denis Vlasenko90e485c2007-05-23 15:22:50 +00003455#endif
Eric Andersen25f27032001-04-26 23:22:31 +00003456 setup_redirect(ctx, redir_fd, redir_style, input);
3457 break;
3458 case '<':
3459 redir_fd = redirect_opt_num(dest);
3460 done_word(dest, ctx);
Denis Vlasenkobb81c582007-01-30 22:32:09 +00003461 redir_style = REDIRECT_INPUT;
Eric Andersen25f27032001-04-26 23:22:31 +00003462 if (next == '<') {
Denis Vlasenkobb81c582007-01-30 22:32:09 +00003463 redir_style = REDIRECT_HEREIS;
Eric Andersen25f27032001-04-26 23:22:31 +00003464 b_getch(input);
3465 } else if (next == '>') {
Denis Vlasenkobb81c582007-01-30 22:32:09 +00003466 redir_style = REDIRECT_IO;
Eric Andersen25f27032001-04-26 23:22:31 +00003467 b_getch(input);
Denis Vlasenko90e485c2007-05-23 15:22:50 +00003468 }
3469#if 0
3470 else if (next == '(') {
3471 syntax("<(process) not supported");
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00003472 debug_printf_parse("parse_stream return 1: <(process) not supported\n");
Eric Andersen25f27032001-04-26 23:22:31 +00003473 return 1;
3474 }
Denis Vlasenko90e485c2007-05-23 15:22:50 +00003475#endif
Eric Andersen25f27032001-04-26 23:22:31 +00003476 setup_redirect(ctx, redir_fd, redir_style, input);
3477 break;
3478 case ';':
3479 done_word(dest, ctx);
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00003480 done_pipe(ctx, PIPE_SEQ);
Eric Andersen25f27032001-04-26 23:22:31 +00003481 break;
3482 case '&':
3483 done_word(dest, ctx);
Denis Vlasenkobb81c582007-01-30 22:32:09 +00003484 if (next == '&') {
Eric Andersen25f27032001-04-26 23:22:31 +00003485 b_getch(input);
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00003486 done_pipe(ctx, PIPE_AND);
Eric Andersen25f27032001-04-26 23:22:31 +00003487 } else {
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00003488 done_pipe(ctx, PIPE_BG);
Eric Andersen25f27032001-04-26 23:22:31 +00003489 }
3490 break;
3491 case '|':
3492 done_word(dest, ctx);
Denis Vlasenkobb81c582007-01-30 22:32:09 +00003493 if (next == '|') {
Eric Andersen25f27032001-04-26 23:22:31 +00003494 b_getch(input);
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00003495 done_pipe(ctx, PIPE_OR);
Eric Andersen25f27032001-04-26 23:22:31 +00003496 } else {
3497 /* we could pick up a file descriptor choice here
3498 * with redirect_opt_num(), but bash doesn't do it.
3499 * "echo foo 2| cat" yields "foo 2". */
3500 done_command(ctx);
3501 }
3502 break;
3503 case '(':
3504 case '{':
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00003505 if (parse_group(dest, ctx, input, ch) != 0) {
3506 debug_printf_parse("parse_stream return 1: parse_group returned non-0\n");
Denis Vlasenkobb81c582007-01-30 22:32:09 +00003507 return 1;
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00003508 }
Eric Andersen25f27032001-04-26 23:22:31 +00003509 break;
3510 case ')':
3511 case '}':
Denis Vlasenko90e485c2007-05-23 15:22:50 +00003512 syntax("unexpected }"); /* Proper use of this character is caught by end_trigger */
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00003513 debug_printf_parse("parse_stream return 1: unexpected '}'\n");
Eric Andersen25f27032001-04-26 23:22:31 +00003514 return 1;
Eric Andersen25f27032001-04-26 23:22:31 +00003515 default:
Denis Vlasenko90e485c2007-05-23 15:22:50 +00003516 if (ENABLE_HUSH_DEBUG)
3517 bb_error_msg_and_die("BUG: unexpected %c\n", ch);
Eric Andersen25f27032001-04-26 23:22:31 +00003518 }
3519 }
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00003520 /* Complain if quote? No, maybe we just finished a command substitution
Eric Andersen25f27032001-04-26 23:22:31 +00003521 * that was quoted. Example:
Eric Andersenc7bda1c2004-03-15 08:29:22 +00003522 * $ echo "`cat foo` plus more"
Eric Andersen25f27032001-04-26 23:22:31 +00003523 * and we just got the EOF generated by the subshell that ran "cat foo"
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00003524 * The only real complaint is if we got an EOF when end_trigger != NULL,
Eric Andersen25f27032001-04-26 23:22:31 +00003525 * that is, we were really supposed to get end_trigger, and never got
3526 * one before the EOF. Can't use the standard "syntax error" return code,
3527 * so that parse_stream_outer can distinguish the EOF and exit smoothly. */
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00003528 debug_printf_parse("parse_stream return %d\n", -(end_trigger != NULL));
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00003529 if (end_trigger)
Denis Vlasenkof03dbed2007-04-13 19:55:50 +00003530 return -1;
Eric Andersen25f27032001-04-26 23:22:31 +00003531 return 0;
3532}
3533
Denis Vlasenko8f6bdb42007-05-16 09:36:55 +00003534static void set_in_charmap(const char *set, int code)
Eric Andersen25f27032001-04-26 23:22:31 +00003535{
Denis Vlasenkof5294e12007-04-14 10:09:57 +00003536 while (*set)
Denis Vlasenko8f6bdb42007-05-16 09:36:55 +00003537 charmap[(unsigned char)*set++] = code;
Eric Andersen25f27032001-04-26 23:22:31 +00003538}
3539
Denis Vlasenko8f6bdb42007-05-16 09:36:55 +00003540static void update_charmap(void)
Eric Andersen25f27032001-04-26 23:22:31 +00003541{
Denis Vlasenko8f6bdb42007-05-16 09:36:55 +00003542 /* char *ifs and char charmap[256] are both globals. */
Eric Andersen25f27032001-04-26 23:22:31 +00003543 ifs = getenv("IFS");
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00003544 if (ifs == NULL)
3545 ifs = " \t\n";
Eric Andersen25f27032001-04-26 23:22:31 +00003546 /* Precompute a list of 'flow through' behavior so it can be treated
3547 * quickly up front. Computation is necessary because of IFS.
3548 * Special case handling of IFS == " \t\n" is not implemented.
Denis Vlasenko8f6bdb42007-05-16 09:36:55 +00003549 * The charmap[] array only really needs two bits each,
3550 * and on most machines that would be faster (reduced L1 cache use).
Eric Andersen25f27032001-04-26 23:22:31 +00003551 */
Denis Vlasenko8f6bdb42007-05-16 09:36:55 +00003552 memset(charmap, CHAR_ORDINARY, sizeof(charmap));
Denis Vlasenko14b5dd92007-05-20 21:51:38 +00003553#if ENABLE_HUSH_TICK
Denis Vlasenko8f6bdb42007-05-16 09:36:55 +00003554 set_in_charmap("\\$\"`", CHAR_SPECIAL);
Denis Vlasenko14b5dd92007-05-20 21:51:38 +00003555#else
3556 set_in_charmap("\\$\"", CHAR_SPECIAL);
3557#endif
Denis Vlasenko8f6bdb42007-05-16 09:36:55 +00003558 set_in_charmap("<>;&|(){}#'", CHAR_ORDINARY_IF_QUOTED);
Denis Vlasenko14b5dd92007-05-20 21:51:38 +00003559 set_in_charmap(ifs, CHAR_IFS); /* are ordinary if quoted */
Eric Andersen25f27032001-04-26 23:22:31 +00003560}
3561
Eric Andersenaff114c2004-04-14 17:51:38 +00003562/* most recursion does not come through here, the exception is
Denis Vlasenko170435c2007-05-23 13:01:10 +00003563 * from builtin_source() and builtin_eval() */
3564static int parse_and_run_stream(struct in_str *inp, int parse_flag)
Eric Andersen25f27032001-04-26 23:22:31 +00003565{
Eric Andersen25f27032001-04-26 23:22:31 +00003566 struct p_context ctx;
Denis Vlasenkobb81c582007-01-30 22:32:09 +00003567 o_string temp = NULL_O_STRING;
Eric Andersen25f27032001-04-26 23:22:31 +00003568 int rcode;
3569 do {
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00003570 ctx.parse_type = parse_flag;
Eric Andersen25f27032001-04-26 23:22:31 +00003571 initialize_context(&ctx);
Denis Vlasenko8f6bdb42007-05-16 09:36:55 +00003572 update_charmap();
Denis Vlasenko219e88d2007-05-21 10:18:23 +00003573 if (!(parse_flag & PARSEFLAG_SEMICOLON) || (parse_flag & PARSEFLAG_REPARSING))
Denis Vlasenko8f6bdb42007-05-16 09:36:55 +00003574 set_in_charmap(";$&|", CHAR_ORDINARY);
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00003575#if ENABLE_HUSH_INTERACTIVE
Denis Vlasenko5a1437d2007-05-24 13:22:47 +00003576 inp->promptmode = 0; /* PS1 */
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00003577#endif
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00003578 /* We will stop & execute after each ';' or '\n'.
3579 * Example: "sleep 9999; echo TEST" + ctrl-C:
3580 * TEST should be printed */
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00003581 rcode = parse_stream(&temp, &ctx, inp, ";\n");
Eric Andersen4c9b68f2002-04-13 12:33:41 +00003582 if (rcode != 1 && ctx.old_flag != 0) {
Denis Vlasenko90e485c2007-05-23 15:22:50 +00003583 syntax(NULL);
Eric Andersen4c9b68f2002-04-13 12:33:41 +00003584 }
3585 if (rcode != 1 && ctx.old_flag == 0) {
3586 done_word(&temp, &ctx);
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00003587 done_pipe(&ctx, PIPE_SEQ);
Denis Vlasenko400c5b62007-05-04 13:07:27 +00003588 debug_print_tree(ctx.list_head, 0);
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00003589 debug_printf_exec("parse_stream_outer: run_list\n");
Eric Andersen4c9b68f2002-04-13 12:33:41 +00003590 run_list(ctx.list_head);
3591 } else {
3592 if (ctx.old_flag != 0) {
3593 free(ctx.stack);
3594 b_reset(&temp);
Eric Andersenc7bda1c2004-03-15 08:29:22 +00003595 }
Eric Andersen4c9b68f2002-04-13 12:33:41 +00003596 temp.nonnull = 0;
3597 temp.quote = 0;
3598 inp->p = NULL;
Denis Vlasenko2f1bb362007-04-21 10:01:14 +00003599 free_pipe_list(ctx.list_head, 0);
Eric Andersen4c9b68f2002-04-13 12:33:41 +00003600 }
Eric Andersena813afc2001-05-24 16:19:36 +00003601 b_free(&temp);
Denis Vlasenko219e88d2007-05-21 10:18:23 +00003602 } while (rcode != -1 && !(parse_flag & PARSEFLAG_EXIT_FROM_LOOP)); /* loop on syntax errors, return on EOF */
Eric Andersen25f27032001-04-26 23:22:31 +00003603 return 0;
3604}
3605
Denis Vlasenko170435c2007-05-23 13:01:10 +00003606static int parse_and_run_string(const char *s, int parse_flag)
Eric Andersen25f27032001-04-26 23:22:31 +00003607{
3608 struct in_str input;
3609 setup_string_in_str(&input, s);
Denis Vlasenko170435c2007-05-23 13:01:10 +00003610 return parse_and_run_stream(&input, parse_flag);
Eric Andersen25f27032001-04-26 23:22:31 +00003611}
3612
Denis Vlasenko170435c2007-05-23 13:01:10 +00003613static int parse_and_run_file(FILE *f)
Eric Andersen25f27032001-04-26 23:22:31 +00003614{
3615 int rcode;
3616 struct in_str input;
3617 setup_file_in_str(&input, f);
Denis Vlasenko170435c2007-05-23 13:01:10 +00003618 rcode = parse_and_run_stream(&input, PARSEFLAG_SEMICOLON);
Eric Andersen25f27032001-04-26 23:22:31 +00003619 return rcode;
3620}
3621
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00003622#if ENABLE_HUSH_JOB
Eric Andersen6c947d22001-06-25 22:24:38 +00003623/* Make sure we have a controlling tty. If we get started under a job
3624 * aware app (like bash for example), make sure we are now in charge so
3625 * we don't fight over who gets the foreground */
Eric Anderseneaecbf32001-10-31 10:41:31 +00003626static void setup_job_control(void)
Eric Andersen52a97ca2001-06-22 06:49:26 +00003627{
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00003628 pid_t shell_pgrp;
3629
Denis Vlasenkoa6a17852007-04-28 16:42:11 +00003630 saved_task_pgrp = shell_pgrp = getpgrp();
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00003631 debug_printf_jobs("saved_task_pgrp=%d\n", saved_task_pgrp);
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00003632 fcntl(interactive_fd, F_SETFD, FD_CLOEXEC);
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00003633
Denis Vlasenkoa6a17852007-04-28 16:42:11 +00003634 /* If we were ran as 'hush &',
3635 * sleep until we are in the foreground. */
3636 while (tcgetpgrp(interactive_fd) != shell_pgrp) {
Denis Vlasenkob81b3df2007-04-28 16:48:04 +00003637 /* Send TTIN to ourself (should stop us) */
Denis Vlasenkoff131b92007-04-10 15:42:06 +00003638 kill(- shell_pgrp, SIGTTIN);
Denis Vlasenkoa6a17852007-04-28 16:42:11 +00003639 shell_pgrp = getpgrp();
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00003640 }
Eric Andersen52a97ca2001-06-22 06:49:26 +00003641
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00003642 /* Ignore job-control and misc signals. */
3643 set_jobctrl_sighandler(SIG_IGN);
3644 set_misc_sighandler(SIG_IGN);
3645//huh? signal(SIGCHLD, SIG_IGN);
3646
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00003647 /* We _must_ restore tty pgrp on fatal signals */
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00003648 set_fatal_sighandler(sigexit);
Eric Andersen6c947d22001-06-25 22:24:38 +00003649
3650 /* Put ourselves in our own process group. */
Denis Vlasenko3ac0e002007-04-28 16:45:22 +00003651 setpgrp(); /* is the same as setpgid(our_pid, our_pid); */
Eric Andersen6c947d22001-06-25 22:24:38 +00003652 /* Grab control of the terminal. */
Denis Vlasenko3ac0e002007-04-28 16:45:22 +00003653 tcsetpgrp(interactive_fd, getpid());
Eric Andersen6c947d22001-06-25 22:24:38 +00003654}
Denis Vlasenkob81b3df2007-04-28 16:48:04 +00003655#endif
Eric Andersenada18ff2001-05-21 16:18:22 +00003656
Denis Vlasenko06af2162007-02-03 17:28:39 +00003657int hush_main(int argc, char **argv);
Matt Kraai2d91deb2001-08-01 17:21:35 +00003658int hush_main(int argc, char **argv)
Eric Andersen25f27032001-04-26 23:22:31 +00003659{
Denis Vlasenko6ca409e2007-08-12 20:58:27 +00003660 static const char version_str[] ALIGN1 = "HUSH_VERSION="HUSH_VER_STR;
Denis Vlasenko0a83fc32007-05-25 11:12:32 +00003661 static const struct variable const_shell_ver = {
3662 .next = NULL,
3663 .varstr = (char*)version_str,
3664 .max_len = 1, /* 0 can provoke free(name) */
3665 .flg_export = 1,
3666 .flg_read_only = 1,
3667 };
3668
Eric Andersen25f27032001-04-26 23:22:31 +00003669 int opt;
3670 FILE *input;
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00003671 char **e;
Denis Vlasenkod76c0492007-05-25 02:16:25 +00003672 struct variable *cur_var;
Eric Andersenbc604a22001-05-16 05:24:03 +00003673
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +00003674 PTR_TO_GLOBALS = xzalloc(sizeof(G));
Denis Vlasenkod76c0492007-05-25 02:16:25 +00003675
Denis Vlasenko0a83fc32007-05-25 11:12:32 +00003676 /* Deal with HUSH_VERSION */
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +00003677 shell_ver = const_shell_ver; /* copying struct here */
Denis Vlasenkod76c0492007-05-25 02:16:25 +00003678 top_var = &shell_ver;
Denis Vlasenko0a83fc32007-05-25 11:12:32 +00003679 unsetenv("HUSH_VERSION"); /* in case it exists in initial env */
3680 /* Initialize our shell local variables with the values
Denis Vlasenkod76c0492007-05-25 02:16:25 +00003681 * currently living in the environment */
Denis Vlasenkod76c0492007-05-25 02:16:25 +00003682 cur_var = top_var;
Denis Vlasenko0a83fc32007-05-25 11:12:32 +00003683 e = environ;
Denis Vlasenkod76c0492007-05-25 02:16:25 +00003684 if (e) while (*e) {
3685 char *value = strchr(*e, '=');
3686 if (value) { /* paranoia */
3687 cur_var->next = xzalloc(sizeof(*cur_var));
3688 cur_var = cur_var->next;
Denis Vlasenko28c0f0f2007-05-25 02:46:01 +00003689 cur_var->varstr = *e;
Denis Vlasenkod76c0492007-05-25 02:16:25 +00003690 cur_var->max_len = strlen(*e);
3691 cur_var->flg_export = 1;
3692 }
3693 e++;
3694 }
Denis Vlasenko0a83fc32007-05-25 11:12:32 +00003695 putenv((char *)version_str); /* reinstate HUSH_VERSION */
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +00003696
Denis Vlasenko38f63192007-01-22 09:03:07 +00003697#if ENABLE_FEATURE_EDITING
Denis Vlasenko8e1c7152007-01-22 07:21:38 +00003698 line_input_state = new_line_input_t(FOR_SHELL);
3699#endif
Eric Andersen25f27032001-04-26 23:22:31 +00003700 /* XXX what should these be while sourcing /etc/profile? */
3701 global_argc = argc;
3702 global_argv = argv;
Eric Andersen94ac2442001-05-22 19:05:18 +00003703 /* Initialize some more globals to non-zero values */
3704 set_cwd();
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00003705#if ENABLE_HUSH_INTERACTIVE
3706#if ENABLE_FEATURE_EDITING
3707 cmdedit_set_initial_prompt();
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00003708#endif
Eric Andersen94ac2442001-05-22 19:05:18 +00003709 PS2 = "> ";
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00003710#endif
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +00003711
Denis Vlasenkod76c0492007-05-25 02:16:25 +00003712 if (EXIT_SUCCESS) /* otherwise is already done */
3713 last_return_code = EXIT_SUCCESS;
Eric Andersen25f27032001-04-26 23:22:31 +00003714
3715 if (argv[0] && argv[0][0] == '-') {
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00003716 debug_printf("sourcing /etc/profile\n");
Denis Vlasenkof03dbed2007-04-13 19:55:50 +00003717 input = fopen("/etc/profile", "r");
3718 if (input != NULL) {
Eric Andersena90f20b2001-06-26 23:00:21 +00003719 mark_open(fileno(input));
Denis Vlasenko170435c2007-05-23 13:01:10 +00003720 parse_and_run_file(input);
Eric Andersena90f20b2001-06-26 23:00:21 +00003721 mark_closed(fileno(input));
3722 fclose(input);
3723 }
Eric Andersen25f27032001-04-26 23:22:31 +00003724 }
Denis Vlasenkobb81c582007-01-30 22:32:09 +00003725 input = stdin;
Eric Andersenc7bda1c2004-03-15 08:29:22 +00003726
Eric Andersen25f27032001-04-26 23:22:31 +00003727 while ((opt = getopt(argc, argv, "c:xif")) > 0) {
3728 switch (opt) {
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00003729 case 'c':
Denis Vlasenko5f786c22007-04-20 08:35:45 +00003730 global_argv = argv + optind;
3731 global_argc = argc - optind;
Denis Vlasenko170435c2007-05-23 13:01:10 +00003732 opt = parse_and_run_string(optarg, PARSEFLAG_SEMICOLON);
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00003733 goto final_return;
3734 case 'i':
Denis Vlasenkoc666f712007-05-16 22:18:54 +00003735 /* Well, we cannot just declare interactiveness,
3736 * we have to have some stuff (ctty, etc) */
3737 /* interactive_fd++; */
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00003738 break;
3739 case 'f':
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +00003740 fake_mode = 1;
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00003741 break;
3742 default:
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00003743#ifndef BB_VER
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00003744 fprintf(stderr, "Usage: sh [FILE]...\n"
3745 " or: sh -c command [args]...\n\n");
3746 exit(EXIT_FAILURE);
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00003747#else
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00003748 bb_show_usage();
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00003749#endif
Eric Andersen25f27032001-04-26 23:22:31 +00003750 }
3751 }
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00003752#if ENABLE_HUSH_JOB
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00003753 /* A shell is interactive if the '-i' flag was given, or if all of
Eric Andersen25f27032001-04-26 23:22:31 +00003754 * the following conditions are met:
Denis Vlasenko55b2de72007-04-18 17:21:28 +00003755 * no -c command
Eric Andersen25f27032001-04-26 23:22:31 +00003756 * no arguments remaining or the -s flag given
3757 * standard input is a terminal
3758 * standard output is a terminal
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00003759 * Refer to Posix.2, the description of the 'sh' utility. */
Denis Vlasenkobb81c582007-01-30 22:32:09 +00003760 if (argv[optind] == NULL && input == stdin
3761 && isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)
3762 ) {
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00003763 saved_tty_pgrp = tcgetpgrp(STDIN_FILENO);
3764 debug_printf("saved_tty_pgrp=%d\n", saved_tty_pgrp);
3765 if (saved_tty_pgrp >= 0) {
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00003766 /* try to dup to high fd#, >= 255 */
3767 interactive_fd = fcntl(STDIN_FILENO, F_DUPFD, 255);
3768 if (interactive_fd < 0) {
3769 /* try to dup to any fd */
3770 interactive_fd = dup(STDIN_FILENO);
3771 if (interactive_fd < 0)
3772 /* give up */
3773 interactive_fd = 0;
3774 }
Denis Vlasenko2f1bb362007-04-21 10:01:14 +00003775 // TODO: track & disallow any attempts of user
3776 // to (inadvertently) close/redirect it
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00003777 }
Eric Andersen25f27032001-04-26 23:22:31 +00003778 }
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00003779 debug_printf("interactive_fd=%d\n", interactive_fd);
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00003780 if (interactive_fd) {
Eric Andersen25f27032001-04-26 23:22:31 +00003781 /* Looks like they want an interactive shell */
Eric Andersen52a97ca2001-06-22 06:49:26 +00003782 setup_job_control();
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00003783 /* Make xfuncs do cleanup on exit */
3784 die_sleep = -1; /* flag */
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00003785// FIXME: should we reset die_sleep = 0 whereever we fork?
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00003786 if (setjmp(die_jmp)) {
3787 /* xfunc has failed! die die die */
3788 hush_exit(xfunc_error_retval);
3789 }
Denis Vlasenko2f1bb362007-04-21 10:01:14 +00003790#if !ENABLE_FEATURE_SH_EXTRA_QUIET
Denis Vlasenkoca525b42007-06-13 12:27:17 +00003791 printf("\n\n%s hush - the humble shell v"HUSH_VER_STR"\n", bb_banner);
Denis Vlasenko2f1bb362007-04-21 10:01:14 +00003792 printf("Enter 'help' for a list of built-in commands.\n\n");
3793#endif
Eric Andersenada18ff2001-05-21 16:18:22 +00003794 }
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00003795#elif ENABLE_HUSH_INTERACTIVE
3796/* no job control compiled, only prompt/line editing */
3797 if (argv[optind] == NULL && input == stdin
3798 && isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)
3799 ) {
3800 interactive_fd = fcntl(STDIN_FILENO, F_DUPFD, 255);
3801 if (interactive_fd < 0) {
3802 /* try to dup to any fd */
3803 interactive_fd = dup(STDIN_FILENO);
3804 if (interactive_fd < 0)
3805 /* give up */
3806 interactive_fd = 0;
3807 }
3808 }
3809
Denis Vlasenkob81b3df2007-04-28 16:48:04 +00003810#endif
Eric Andersenc7bda1c2004-03-15 08:29:22 +00003811
Denis Vlasenkobb81c582007-01-30 22:32:09 +00003812 if (argv[optind] == NULL) {
Denis Vlasenko170435c2007-05-23 13:01:10 +00003813 opt = parse_and_run_file(stdin);
Eric Andersene67c3ce2001-05-02 02:09:36 +00003814 goto final_return;
Eric Andersen25f27032001-04-26 23:22:31 +00003815 }
Eric Andersen25f27032001-04-26 23:22:31 +00003816
3817 debug_printf("\nrunning script '%s'\n", argv[optind]);
Denis Vlasenko4c978632007-02-03 03:31:13 +00003818 global_argv = argv + optind;
3819 global_argc = argc - optind;
Rob Landleyd921b2e2006-08-03 15:41:12 +00003820 input = xfopen(argv[optind], "r");
Denis Vlasenko170435c2007-05-23 13:01:10 +00003821 opt = parse_and_run_file(input);
Eric Andersen25f27032001-04-26 23:22:31 +00003822
Denis Vlasenkod76c0492007-05-25 02:16:25 +00003823 final_return:
3824
Denis Vlasenko38f63192007-01-22 09:03:07 +00003825#if ENABLE_FEATURE_CLEAN_UP
Eric Andersenaeb44c42001-05-22 20:29:00 +00003826 fclose(input);
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00003827 if (cwd != bb_msg_unknown)
Eric Andersenaeb44c42001-05-22 20:29:00 +00003828 free((char*)cwd);
Denis Vlasenkod76c0492007-05-25 02:16:25 +00003829 cur_var = top_var->next;
3830 while (cur_var) {
3831 struct variable *tmp = cur_var;
3832 if (!cur_var->max_len)
Denis Vlasenko28c0f0f2007-05-25 02:46:01 +00003833 free(cur_var->varstr);
Denis Vlasenkod76c0492007-05-25 02:16:25 +00003834 cur_var = cur_var->next;
3835 free(tmp);
Eric Andersenaeb44c42001-05-22 20:29:00 +00003836 }
Eric Andersen25f27032001-04-26 23:22:31 +00003837#endif
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00003838 hush_exit(opt ? opt : last_return_code);
Eric Andersen25f27032001-04-26 23:22:31 +00003839}