The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 1 | /* $NetBSD: error.c,v 1.31 2003/08/07 09:05:30 agc Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 1991, 1993 |
| 5 | * The Regents of the University of California. All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software contributed to Berkeley by |
| 8 | * Kenneth Almquist. |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or without |
| 11 | * modification, are permitted provided that the following conditions |
| 12 | * are met: |
| 13 | * 1. Redistributions of source code must retain the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer. |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in the |
| 17 | * documentation and/or other materials provided with the distribution. |
| 18 | * 3. Neither the name of the University nor the names of its contributors |
| 19 | * may be used to endorse or promote products derived from this software |
| 20 | * without specific prior written permission. |
| 21 | * |
| 22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 32 | * SUCH DAMAGE. |
| 33 | */ |
| 34 | |
| 35 | #include <sys/cdefs.h> |
| 36 | #ifndef lint |
| 37 | #if 0 |
| 38 | static char sccsid[] = "@(#)error.c 8.2 (Berkeley) 5/4/95"; |
| 39 | #else |
| 40 | __RCSID("$NetBSD: error.c,v 1.31 2003/08/07 09:05:30 agc Exp $"); |
| 41 | #endif |
| 42 | #endif /* not lint */ |
| 43 | |
| 44 | /* |
| 45 | * Errors and exceptions. |
| 46 | */ |
| 47 | |
| 48 | #include <signal.h> |
| 49 | #include <stdlib.h> |
| 50 | #include <unistd.h> |
| 51 | #include <errno.h> |
| 52 | #include <stdio.h> |
| 53 | #include <string.h> |
| 54 | |
| 55 | #include "shell.h" |
| 56 | #include "main.h" |
| 57 | #include "options.h" |
| 58 | #include "output.h" |
| 59 | #include "error.h" |
| 60 | #include "show.h" |
| 61 | |
| 62 | #define signal bsd_signal |
| 63 | /* |
| 64 | * Code to handle exceptions in C. |
| 65 | */ |
| 66 | |
| 67 | struct jmploc *handler; |
| 68 | int exception; |
| 69 | volatile int suppressint; |
| 70 | volatile int intpending; |
| 71 | char *commandname; |
| 72 | |
| 73 | |
| 74 | static void exverror(int, const char *, va_list) |
| 75 | __attribute__((__noreturn__)); |
| 76 | |
| 77 | /* |
| 78 | * Called to raise an exception. Since C doesn't include exceptions, we |
| 79 | * just do a longjmp to the exception handler. The type of exception is |
| 80 | * stored in the global variable "exception". |
| 81 | */ |
| 82 | |
| 83 | void |
| 84 | exraise(int e) |
| 85 | { |
| 86 | if (handler == NULL) |
| 87 | abort(); |
| 88 | exception = e; |
| 89 | longjmp(handler->loc, 1); |
| 90 | } |
| 91 | |
| 92 | |
| 93 | /* |
| 94 | * Called from trap.c when a SIGINT is received. (If the user specifies |
| 95 | * that SIGINT is to be trapped or ignored using the trap builtin, then |
| 96 | * this routine is not called.) Suppressint is nonzero when interrupts |
| 97 | * are held using the INTOFF macro. The call to _exit is necessary because |
| 98 | * there is a short period after a fork before the signal handlers are |
| 99 | * set to the appropriate value for the child. (The test for iflag is |
| 100 | * just defensive programming.) |
| 101 | */ |
| 102 | |
| 103 | void |
| 104 | onint(void) |
| 105 | { |
| 106 | sigset_t nsigset; |
| 107 | |
| 108 | if (suppressint) { |
| 109 | intpending = 1; |
| 110 | return; |
| 111 | } |
| 112 | intpending = 0; |
| 113 | sigemptyset(&nsigset); |
| 114 | sigprocmask(SIG_SETMASK, &nsigset, NULL); |
| 115 | if (rootshell && iflag) |
| 116 | exraise(EXINT); |
| 117 | else { |
| 118 | signal(SIGINT, SIG_DFL); |
| 119 | raise(SIGINT); |
| 120 | } |
| 121 | /* NOTREACHED */ |
| 122 | } |
| 123 | |
| 124 | static void |
| 125 | exvwarning(int sv_errno, const char *msg, va_list ap) |
| 126 | { |
| 127 | /* Partially emulate line buffered output so that: |
| 128 | * printf '%d\n' 1 a 2 |
| 129 | * and |
| 130 | * printf '%d %d %d\n' 1 a 2 |
| 131 | * both generate sensible text when stdout and stderr are merged. |
| 132 | */ |
| 133 | if (output.nextc != output.buf && output.nextc[-1] == '\n') |
| 134 | flushout(&output); |
| 135 | if (commandname) |
| 136 | outfmt(&errout, "%s: ", commandname); |
| 137 | if (msg != NULL) { |
| 138 | doformat(&errout, msg, ap); |
| 139 | if (sv_errno >= 0) |
| 140 | outfmt(&errout, ": "); |
| 141 | } |
| 142 | if (sv_errno >= 0) |
| 143 | outfmt(&errout, "%s", strerror(sv_errno)); |
| 144 | out2c('\n'); |
| 145 | flushout(&errout); |
| 146 | } |
| 147 | |
| 148 | /* |
| 149 | * Exverror is called to raise the error exception. If the second argument |
| 150 | * is not NULL then error prints an error message using printf style |
| 151 | * formatting. It then raises the error exception. |
| 152 | */ |
| 153 | static void |
| 154 | exverror(int cond, const char *msg, va_list ap) |
| 155 | { |
| 156 | CLEAR_PENDING_INT; |
| 157 | INTOFF; |
| 158 | |
| 159 | #ifdef DEBUG |
| 160 | if (msg) { |
| 161 | TRACE(("exverror(%d, \"", cond)); |
| 162 | TRACEV((msg, ap)); |
| 163 | TRACE(("\") pid=%d\n", getpid())); |
| 164 | } else |
| 165 | TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid())); |
| 166 | #endif |
| 167 | if (msg) |
| 168 | exvwarning(-1, msg, ap); |
| 169 | |
| 170 | flushall(); |
| 171 | exraise(cond); |
| 172 | /* NOTREACHED */ |
| 173 | } |
| 174 | |
| 175 | |
| 176 | void |
| 177 | error(const char *msg, ...) |
| 178 | { |
| 179 | va_list ap; |
| 180 | |
| 181 | va_start(ap, msg); |
| 182 | exverror(EXERROR, msg, ap); |
| 183 | /* NOTREACHED */ |
| 184 | va_end(ap); |
| 185 | } |
| 186 | |
| 187 | |
| 188 | void |
| 189 | exerror(int cond, const char *msg, ...) |
| 190 | { |
| 191 | va_list ap; |
| 192 | |
| 193 | va_start(ap, msg); |
| 194 | exverror(cond, msg, ap); |
| 195 | /* NOTREACHED */ |
| 196 | va_end(ap); |
| 197 | } |
| 198 | |
| 199 | /* |
| 200 | * error/warning routines for external builtins |
| 201 | */ |
| 202 | |
| 203 | void |
| 204 | sh_exit(int rval) |
| 205 | { |
| 206 | exerrno = rval & 255; |
| 207 | exraise(EXEXEC); |
| 208 | } |
| 209 | |
| 210 | void |
| 211 | sh_err(int status, const char *fmt, ...) |
| 212 | { |
| 213 | va_list ap; |
| 214 | |
| 215 | va_start(ap, fmt); |
| 216 | exvwarning(errno, fmt, ap); |
| 217 | va_end(ap); |
| 218 | sh_exit(status); |
| 219 | } |
| 220 | |
| 221 | void |
| 222 | sh_verr(int status, const char *fmt, va_list ap) |
| 223 | { |
| 224 | exvwarning(errno, fmt, ap); |
| 225 | sh_exit(status); |
| 226 | } |
| 227 | |
| 228 | void |
| 229 | sh_errx(int status, const char *fmt, ...) |
| 230 | { |
| 231 | va_list ap; |
| 232 | |
| 233 | va_start(ap, fmt); |
| 234 | exvwarning(-1, fmt, ap); |
| 235 | va_end(ap); |
| 236 | sh_exit(status); |
| 237 | } |
| 238 | |
| 239 | void |
| 240 | sh_verrx(int status, const char *fmt, va_list ap) |
| 241 | { |
| 242 | exvwarning(-1, fmt, ap); |
| 243 | sh_exit(status); |
| 244 | } |
| 245 | |
| 246 | void |
| 247 | sh_warn(const char *fmt, ...) |
| 248 | { |
| 249 | va_list ap; |
| 250 | |
| 251 | va_start(ap, fmt); |
| 252 | exvwarning(errno, fmt, ap); |
| 253 | va_end(ap); |
| 254 | } |
| 255 | |
| 256 | void |
| 257 | sh_vwarn(const char *fmt, va_list ap) |
| 258 | { |
| 259 | exvwarning(errno, fmt, ap); |
| 260 | } |
| 261 | |
| 262 | void |
| 263 | sh_warnx(const char *fmt, ...) |
| 264 | { |
| 265 | va_list ap; |
| 266 | |
| 267 | va_start(ap, fmt); |
| 268 | exvwarning(-1, fmt, ap); |
| 269 | va_end(ap); |
| 270 | } |
| 271 | |
| 272 | void |
| 273 | sh_vwarnx(const char *fmt, va_list ap) |
| 274 | { |
| 275 | exvwarning(-1, fmt, ap); |
| 276 | } |
| 277 | |
| 278 | |
| 279 | /* |
| 280 | * Table of error messages. |
| 281 | */ |
| 282 | |
| 283 | struct errname { |
| 284 | short errcode; /* error number */ |
| 285 | short action; /* operation which encountered the error */ |
| 286 | const char *msg; /* text describing the error */ |
| 287 | }; |
| 288 | |
| 289 | |
| 290 | #define ALL (E_OPEN|E_CREAT|E_EXEC) |
| 291 | |
| 292 | STATIC const struct errname errormsg[] = { |
| 293 | { EINTR, ALL, "interrupted" }, |
| 294 | { EACCES, ALL, "permission denied" }, |
| 295 | { EIO, ALL, "I/O error" }, |
| 296 | { EEXIST, ALL, "file exists" }, |
| 297 | { ENOENT, E_OPEN, "no such file" }, |
| 298 | { ENOENT, E_CREAT,"directory nonexistent" }, |
| 299 | { ENOENT, E_EXEC, "not found" }, |
| 300 | { ENOTDIR, E_OPEN, "no such file" }, |
| 301 | { ENOTDIR, E_CREAT,"directory nonexistent" }, |
| 302 | { ENOTDIR, E_EXEC, "not found" }, |
| 303 | { EISDIR, ALL, "is a directory" }, |
| 304 | #ifdef EMFILE |
| 305 | { EMFILE, ALL, "too many open files" }, |
| 306 | #endif |
| 307 | { ENFILE, ALL, "file table overflow" }, |
| 308 | { ENOSPC, ALL, "file system full" }, |
| 309 | #ifdef EDQUOT |
| 310 | { EDQUOT, ALL, "disk quota exceeded" }, |
| 311 | #endif |
| 312 | #ifdef ENOSR |
| 313 | { ENOSR, ALL, "no streams resources" }, |
| 314 | #endif |
| 315 | { ENXIO, ALL, "no such device or address" }, |
| 316 | { EROFS, ALL, "read-only file system" }, |
| 317 | { ETXTBSY, ALL, "text busy" }, |
| 318 | #ifdef EAGAIN |
| 319 | { EAGAIN, E_EXEC, "not enough memory" }, |
| 320 | #endif |
| 321 | { ENOMEM, ALL, "not enough memory" }, |
| 322 | #ifdef ENOLINK |
| 323 | { ENOLINK, ALL, "remote access failed" }, |
| 324 | #endif |
| 325 | #ifdef EMULTIHOP |
| 326 | { EMULTIHOP, ALL, "remote access failed" }, |
| 327 | #endif |
| 328 | #ifdef ECOMM |
| 329 | { ECOMM, ALL, "remote access failed" }, |
| 330 | #endif |
| 331 | #ifdef ESTALE |
| 332 | { ESTALE, ALL, "remote access failed" }, |
| 333 | #endif |
| 334 | #ifdef ETIMEDOUT |
| 335 | { ETIMEDOUT, ALL, "remote access failed" }, |
| 336 | #endif |
| 337 | #ifdef ELOOP |
| 338 | { ELOOP, ALL, "symbolic link loop" }, |
| 339 | #endif |
| 340 | { E2BIG, E_EXEC, "argument list too long" }, |
| 341 | #ifdef ELIBACC |
| 342 | { ELIBACC, E_EXEC, "shared library missing" }, |
| 343 | #endif |
| 344 | { 0, 0, NULL }, |
| 345 | }; |
| 346 | |
| 347 | |
| 348 | /* |
| 349 | * Return a string describing an error. The returned string may be a |
| 350 | * pointer to a static buffer that will be overwritten on the next call. |
| 351 | * Action describes the operation that got the error. |
| 352 | */ |
| 353 | |
| 354 | const char * |
| 355 | errmsg(int e, int action) |
| 356 | { |
| 357 | struct errname const *ep; |
| 358 | static char buf[12]; |
| 359 | |
| 360 | for (ep = errormsg ; ep->errcode ; ep++) { |
| 361 | if (ep->errcode == e && (ep->action & action) != 0) |
| 362 | return ep->msg; |
| 363 | } |
| 364 | fmtstr(buf, sizeof buf, "error %d", e); |
| 365 | return buf; |
| 366 | } |