blob: 9c96726d9faa5bf9e7213a91b689498c797a8d02 [file] [log] [blame]
Erik Andersenccc74882000-01-27 02:40:21 +00001/* vi: set sw=4 ts=4: */
Eric Andersenc4996011999-10-20 22:08:37 +00002/*
3 * Mini init implementation for busybox
4 *
5 *
6 * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
7 * Adjusted by so many folks, it's impossible to keep track.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 *
23 */
24
Erik Andersene132f4b2000-02-09 04:16:43 +000025/* Turn this on to disable all the dangerous
26 rebooting stuff when debugging.
27#define DEBUG_INIT
28*/
29
Eric Andersen3570a342000-09-25 21:45:58 +000030#include "busybox.h"
Erik Andersen4f3f7572000-04-28 00:18:56 +000031#include <stdio.h>
32#include <stdlib.h>
Eric Andersencc8ed391999-10-05 16:24:54 +000033#include <errno.h>
Eric Andersenb186d981999-12-03 09:19:54 +000034#include <paths.h>
Erik Andersen42094cd2000-03-20 21:34:52 +000035#include <signal.h>
36#include <stdarg.h>
Eric Andersencc8ed391999-10-05 16:24:54 +000037#include <string.h>
Erik Andersen4f3f7572000-04-28 00:18:56 +000038#include <termios.h>
39#include <unistd.h>
Eric Andersened3ef502001-01-27 08:24:39 +000040#include <limits.h>
Erik Andersen42094cd2000-03-20 21:34:52 +000041#include <sys/fcntl.h>
42#include <sys/ioctl.h>
Eric Andersencc8ed391999-10-05 16:24:54 +000043#include <sys/mount.h>
Erik Andersen42094cd2000-03-20 21:34:52 +000044#include <sys/types.h>
Erik Andersen42094cd2000-03-20 21:34:52 +000045#include <sys/wait.h>
Erik Andersen4f3f7572000-04-28 00:18:56 +000046#ifdef BB_SYSLOGD
47# include <sys/syslog.h>
48#endif
49
Pavel Roskin9c5fcc32000-07-17 23:45:12 +000050#define bb_need_full_version
51#define BB_DECLARE_EXTERN
52#include "messages.c"
53
Eric Andersenbd22ed82000-07-08 18:55:24 +000054/* From <linux/vt.h> */
55struct vt_stat {
56 unsigned short v_active; /* active vt */
57 unsigned short v_signal; /* signal to send */
58 unsigned short v_state; /* vt bitmask */
59};
Mark Whitley59ab0252001-01-23 22:30:04 +000060static const int VT_GETSTATE = 0x5603; /* get global vt state info */
Eric Andersenbd22ed82000-07-08 18:55:24 +000061
62/* From <linux/serial.h> */
63struct serial_struct {
64 int type;
65 int line;
66 int port;
67 int irq;
68 int flags;
69 int xmit_fifo_size;
70 int custom_divisor;
71 int baud_base;
72 unsigned short close_delay;
73 char reserved_char[2];
74 int hub6;
75 unsigned short closing_wait; /* time to wait before closing */
76 unsigned short closing_wait2; /* no longer used... */
77 int reserved[4];
78};
79
80
Erik Andersen4f3f7572000-04-28 00:18:56 +000081
82#ifndef RB_HALT_SYSTEM
Mark Whitley59ab0252001-01-23 22:30:04 +000083static const int RB_HALT_SYSTEM = 0xcdef0123;
84static const int RB_ENABLE_CAD = 0x89abcdef;
85static const int RB_DISABLE_CAD = 0;
Erik Andersen4f3f7572000-04-28 00:18:56 +000086#define RB_POWER_OFF 0x4321fedc
Mark Whitley59ab0252001-01-23 22:30:04 +000087static const int RB_AUTOBOOT = 0x01234567;
Eric Andersene3a48d82000-12-12 23:22:35 +000088#if defined(__GLIBC__) || defined (__UCLIBC__)
Erik Andersen4f3f7572000-04-28 00:18:56 +000089#include <sys/reboot.h>
90 #define init_reboot(magic) reboot(magic)
91#else
92 #define init_reboot(magic) reboot(0xfee1dead, 672274793, magic)
93#endif
94#endif
95
96#ifndef _PATH_STDPATH
97#define _PATH_STDPATH "/usr/bin:/bin:/usr/sbin:/sbin"
98#endif
Eric Andersencc8ed391999-10-05 16:24:54 +000099
Erik Andersen983b51b2000-04-04 18:14:25 +0000100
Erik Andersen183da4a2000-04-04 18:36:37 +0000101#if defined BB_FEATURE_INIT_COREDUMPS
Erik Andersen983b51b2000-04-04 18:14:25 +0000102/*
Erik Andersen183da4a2000-04-04 18:36:37 +0000103 * When a file named CORE_ENABLE_FLAG_FILE exists, setrlimit is called
104 * before processes are spawned to set core file size as unlimited.
105 * This is for debugging only. Don't use this is production, unless
106 * you want core dumps lying about....
Erik Andersen983b51b2000-04-04 18:14:25 +0000107 */
108#define CORE_ENABLE_FLAG_FILE "/.init_enable_core"
109#include <sys/resource.h>
110#include <sys/time.h>
Erik Andersen183da4a2000-04-04 18:36:37 +0000111#endif
Erik Andersen983b51b2000-04-04 18:14:25 +0000112
Erik Andersen4d1d0111999-12-17 18:44:15 +0000113#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
Erik Andersen4d1d0111999-12-17 18:44:15 +0000114
Erik Andersen4f3f7572000-04-28 00:18:56 +0000115#if defined(__GLIBC__)
116#include <sys/kdaemon.h>
117#else
Eric Andersened3ef502001-01-27 08:24:39 +0000118#include <sys/syscall.h>
119#include <linux/unistd.h>
Eric Andersena15cd0b2000-06-19 18:14:20 +0000120static _syscall2(int, bdflush, int, func, int, data);
Erik Andersen4f3f7572000-04-28 00:18:56 +0000121#endif /* __GLIBC__ */
122
Eric Andersen0ecb54a1999-12-05 23:24:55 +0000123
Erik Andersen42094cd2000-03-20 21:34:52 +0000124#define VT_PRIMARY "/dev/tty1" /* Primary virtual console */
125#define VT_SECONDARY "/dev/tty2" /* Virtual console */
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000126#define VT_THIRD "/dev/tty3" /* Virtual console */
127#define VT_FOURTH "/dev/tty4" /* Virtual console */
128#define VT_LOG "/dev/tty5" /* Virtual console */
Erik Andersen42094cd2000-03-20 21:34:52 +0000129#define SERIAL_CON0 "/dev/ttyS0" /* Primary serial console */
130#define SERIAL_CON1 "/dev/ttyS1" /* Serial console */
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000131#define SHELL "-/bin/sh" /* Default shell */
Erik Andersen42094cd2000-03-20 21:34:52 +0000132#define INITTAB "/etc/inittab" /* inittab file location */
Erik Andersen96e2abd2000-01-07 11:40:44 +0000133#ifndef INIT_SCRIPT
Erik Andersen42094cd2000-03-20 21:34:52 +0000134#define INIT_SCRIPT "/etc/init.d/rcS" /* Default sysinit script. */
Erik Andersen96e2abd2000-01-07 11:40:44 +0000135#endif
Erik Andersen9c88cac1999-12-30 09:25:17 +0000136
Mark Whitley59ab0252001-01-23 22:30:04 +0000137static const int LOG = 0x1;
138static const int CONSOLE = 0x2;
Erik Andersen7dc16072000-01-04 01:10:25 +0000139
140/* Allowed init action types */
141typedef enum {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000142 SYSINIT = 1,
143 RESPAWN,
144 ASKFIRST,
145 WAIT,
Erik Andersene132f4b2000-02-09 04:16:43 +0000146 ONCE,
147 CTRLALTDEL
Erik Andersen7dc16072000-01-04 01:10:25 +0000148} initActionEnum;
149
Erik Andersen42094cd2000-03-20 21:34:52 +0000150/* A mapping between "inittab" action name strings and action type codes. */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000151typedef struct initActionType {
152 const char *name;
153 initActionEnum action;
Erik Andersen7dc16072000-01-04 01:10:25 +0000154} initActionType;
155
156static const struct initActionType actions[] = {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000157 {"sysinit", SYSINIT},
158 {"respawn", RESPAWN},
159 {"askfirst", ASKFIRST},
160 {"wait", WAIT},
161 {"once", ONCE},
Erik Andersene132f4b2000-02-09 04:16:43 +0000162 {"ctrlaltdel", CTRLALTDEL},
Pavel Roskin9027bcf2000-07-14 15:44:25 +0000163 {0, 0}
Erik Andersen7dc16072000-01-04 01:10:25 +0000164};
165
Erik Andersen42094cd2000-03-20 21:34:52 +0000166/* Set up a linked list of initActions, to be read from inittab */
Erik Andersen7dc16072000-01-04 01:10:25 +0000167typedef struct initActionTag initAction;
168struct initActionTag {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000169 pid_t pid;
170 char process[256];
171 char console[256];
172 initAction *nextPtr;
173 initActionEnum action;
Erik Andersen7dc16072000-01-04 01:10:25 +0000174};
Erik Andersene49d5ec2000-02-08 19:58:47 +0000175initAction *initActionList = NULL;
Erik Andersen7dc16072000-01-04 01:10:25 +0000176
177
Erik Andersenac6e71f2000-01-08 22:04:33 +0000178static char *secondConsole = VT_SECONDARY;
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000179static char *thirdConsole = VT_THIRD;
180static char *fourthConsole = VT_FOURTH;
Erik Andersen42094cd2000-03-20 21:34:52 +0000181static char *log = VT_LOG;
182static int kernelVersion = 0;
183static char termType[32] = "TERM=linux";
184static char console[32] = _PATH_CONSOLE;
185
Erik Andersene132f4b2000-02-09 04:16:43 +0000186static void delete_initAction(initAction * action);
Eric Andersen0460ff21999-10-25 23:32:44 +0000187
188
Erik Andersen42094cd2000-03-20 21:34:52 +0000189/* Print a message to the specified device.
190 * Device may be bitwise-or'd from LOG | CONSOLE */
191static void message(int device, char *fmt, ...)
Erik Andersen93d65132000-04-06 08:06:36 +0000192 __attribute__ ((format (printf, 2, 3)));
193static void message(int device, char *fmt, ...)
Eric Andersen0460ff21999-10-25 23:32:44 +0000194{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000195 va_list arguments;
196 int fd;
Erik Andersen7dc16072000-01-04 01:10:25 +0000197
Eric Andersen4c781471999-11-26 08:12:56 +0000198#ifdef BB_SYSLOGD
199
Erik Andersene49d5ec2000-02-08 19:58:47 +0000200 /* Log the message to syslogd */
201 if (device & LOG) {
202 char msg[1024];
Eric Andersen4c781471999-11-26 08:12:56 +0000203
Erik Andersene49d5ec2000-02-08 19:58:47 +0000204 va_start(arguments, fmt);
205 vsnprintf(msg, sizeof(msg), fmt, arguments);
206 va_end(arguments);
Eric Andersen53cfb7e2001-01-31 17:29:47 +0000207 openlog(applet_name, 0, LOG_USER);
Erik Andersene132f4b2000-02-09 04:16:43 +0000208 syslog(LOG_USER|LOG_INFO, msg);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000209 closelog();
Eric Andersen3ae0c781999-11-04 01:13:21 +0000210 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000211#else
212 static int log_fd = -1;
213
214 /* Take full control of the log tty, and never close it.
215 * It's mine, all mine! Muhahahaha! */
216 if (log_fd < 0) {
217 if (log == NULL) {
218 /* don't even try to log, because there is no such console */
219 log_fd = -2;
220 /* log to main console instead */
221 device = CONSOLE;
Erik Andersene132f4b2000-02-09 04:16:43 +0000222 } else if ((log_fd = device_open(log, O_RDWR|O_NDELAY)) < 0) {
223 log_fd = -2;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000224 fprintf(stderr, "Bummer, can't write to log on %s!\r\n", log);
Erik Andersene132f4b2000-02-09 04:16:43 +0000225 log = NULL;
226 device = CONSOLE;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000227 }
228 }
229 if ((device & LOG) && (log_fd >= 0)) {
230 va_start(arguments, fmt);
231 vdprintf(log_fd, fmt, arguments);
232 va_end(arguments);
233 }
Eric Andersen4c781471999-11-26 08:12:56 +0000234#endif
235
Erik Andersene49d5ec2000-02-08 19:58:47 +0000236 if (device & CONSOLE) {
237 /* Always send console messages to /dev/console so people will see them. */
238 if (
239 (fd =
240 device_open(_PATH_CONSOLE,
241 O_WRONLY | O_NOCTTY | O_NDELAY)) >= 0) {
242 va_start(arguments, fmt);
243 vdprintf(fd, fmt, arguments);
244 va_end(arguments);
245 close(fd);
246 } else {
247 fprintf(stderr, "Bummer, can't print: ");
248 va_start(arguments, fmt);
249 vfprintf(stderr, fmt, arguments);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000250 va_end(arguments);
251 }
Eric Andersen3ae0c781999-11-04 01:13:21 +0000252 }
Eric Andersencc8ed391999-10-05 16:24:54 +0000253}
254
Eric Andersen0460ff21999-10-25 23:32:44 +0000255/* Set terminal settings to reasonable defaults */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000256void set_term(int fd)
Eric Andersencc8ed391999-10-05 16:24:54 +0000257{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000258 struct termios tty;
Eric Andersencc8ed391999-10-05 16:24:54 +0000259
Erik Andersene49d5ec2000-02-08 19:58:47 +0000260 tcgetattr(fd, &tty);
Eric Andersencc8ed391999-10-05 16:24:54 +0000261
Erik Andersene49d5ec2000-02-08 19:58:47 +0000262 /* set control chars */
Eric Andersen3849f9b2000-07-10 19:56:47 +0000263 tty.c_cc[VINTR] = 3; /* C-c */
264 tty.c_cc[VQUIT] = 28; /* C-\ */
265 tty.c_cc[VERASE] = 127; /* C-? */
266 tty.c_cc[VKILL] = 21; /* C-u */
267 tty.c_cc[VEOF] = 4; /* C-d */
268 tty.c_cc[VSTART] = 17; /* C-q */
269 tty.c_cc[VSTOP] = 19; /* C-s */
270 tty.c_cc[VSUSP] = 26; /* C-z */
Eric Andersen02bc25b2000-07-06 21:29:32 +0000271
Erik Andersene49d5ec2000-02-08 19:58:47 +0000272 /* use line dicipline 0 */
273 tty.c_line = 0;
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000274
Erik Andersene49d5ec2000-02-08 19:58:47 +0000275 /* Make it be sane */
Erik Andersen6c41c442000-03-19 05:13:49 +0000276 tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD;
277 tty.c_cflag |= HUPCL|CLOCAL;
Eric Andersen08b10341999-11-19 02:38:58 +0000278
Erik Andersene49d5ec2000-02-08 19:58:47 +0000279 /* input modes */
280 tty.c_iflag = ICRNL | IXON | IXOFF;
Eric Andersen08b10341999-11-19 02:38:58 +0000281
Erik Andersene49d5ec2000-02-08 19:58:47 +0000282 /* output modes */
283 tty.c_oflag = OPOST | ONLCR;
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000284
Erik Andersene49d5ec2000-02-08 19:58:47 +0000285 /* local modes */
286 tty.c_lflag =
287 ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN;
Eric Andersencc8ed391999-10-05 16:24:54 +0000288
Erik Andersene49d5ec2000-02-08 19:58:47 +0000289 tcsetattr(fd, TCSANOW, &tty);
Eric Andersencc8ed391999-10-05 16:24:54 +0000290}
291
Eric Andersenbc5941a2000-12-06 23:17:37 +0000292/* How much memory does this machine have?
293 Units are kBytes to avoid overflow on 4GB machines */
Erik Andersend07ee462000-02-21 21:26:32 +0000294static int check_free_memory()
Eric Andersencc8ed391999-10-05 16:24:54 +0000295{
Erik Andersend07ee462000-02-21 21:26:32 +0000296 struct sysinfo info;
Eric Andersenbc5941a2000-12-06 23:17:37 +0000297 unsigned int result, u, s=10;
Eric Andersencc8ed391999-10-05 16:24:54 +0000298
Erik Andersend07ee462000-02-21 21:26:32 +0000299 if (sysinfo(&info) != 0) {
Eric Andersen53cfb7e2001-01-31 17:29:47 +0000300 perror_msg("Error checking free memory");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000301 return -1;
Eric Andersenabc7d591999-10-19 00:27:50 +0000302 }
Eric Andersenbc5941a2000-12-06 23:17:37 +0000303
304 /* Kernels 2.0.x and 2.2.x return info.mem_unit==0 with values in bytes.
305 * Kernels 2.4.0 return info.mem_unit in bytes. */
306 u = info.mem_unit;
307 if (u==0) u=1;
308 while ( (u&1) == 0 && s > 0 ) { u>>=1; s--; }
309 result = (info.totalram>>s) + (info.totalswap>>s);
310 result = result*u;
311 if (result < 0) result = INT_MAX;
312 return result;
Eric Andersencc8ed391999-10-05 16:24:54 +0000313}
314
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000315static void console_init()
Eric Andersen0460ff21999-10-25 23:32:44 +0000316{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000317 int fd;
318 int tried_devcons = 0;
319 int tried_vtprimary = 0;
Erik Andersen029011b2000-03-04 21:19:32 +0000320 struct vt_stat vt;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000321 struct serial_struct sr;
322 char *s;
Eric Andersen0460ff21999-10-25 23:32:44 +0000323
Erik Andersene49d5ec2000-02-08 19:58:47 +0000324 if ((s = getenv("TERM")) != NULL) {
325 snprintf(termType, sizeof(termType) - 1, "TERM=%s", s);
326 }
Erik Andersenac6e71f2000-01-08 22:04:33 +0000327
Erik Andersene49d5ec2000-02-08 19:58:47 +0000328 if ((s = getenv("CONSOLE")) != NULL) {
329 snprintf(console, sizeof(console) - 1, "%s", s);
330 }
Eric Andersenfbb39c81999-11-08 17:00:52 +0000331#if #cpu(sparc)
Erik Andersene49d5ec2000-02-08 19:58:47 +0000332 /* sparc kernel supports console=tty[ab] parameter which is also
333 * passed to init, so catch it here */
334 else if ((s = getenv("console")) != NULL) {
335 /* remap tty[ab] to /dev/ttyS[01] */
336 if (strcmp(s, "ttya") == 0)
337 snprintf(console, sizeof(console) - 1, "%s", SERIAL_CON0);
338 else if (strcmp(s, "ttyb") == 0)
339 snprintf(console, sizeof(console) - 1, "%s", SERIAL_CON1);
340 }
Eric Andersen219d6f51999-11-02 19:43:01 +0000341#endif
Erik Andersene49d5ec2000-02-08 19:58:47 +0000342 else {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000343 /* 2.2 kernels: identify the real console backend and try to use it */
344 if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
345 /* this is a serial console */
346 snprintf(console, sizeof(console) - 1, "/dev/ttyS%d", sr.line);
347 } else if (ioctl(0, VT_GETSTATE, &vt) == 0) {
348 /* this is linux virtual tty */
349 snprintf(console, sizeof(console) - 1, "/dev/tty%d",
350 vt.v_active);
351 } else {
352 snprintf(console, sizeof(console) - 1, "%s", _PATH_CONSOLE);
353 tried_devcons++;
354 }
Eric Andersen07e52971999-11-07 07:38:08 +0000355 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000356
357 while ((fd = open(console, O_RDONLY | O_NONBLOCK)) < 0) {
358 /* Can't open selected console -- try /dev/console */
359 if (!tried_devcons) {
360 tried_devcons++;
361 snprintf(console, sizeof(console) - 1, "%s", _PATH_CONSOLE);
362 continue;
363 }
364 /* Can't open selected console -- try vt1 */
365 if (!tried_vtprimary) {
366 tried_vtprimary++;
367 snprintf(console, sizeof(console) - 1, "%s", VT_PRIMARY);
368 continue;
369 }
370 break;
371 }
372 if (fd < 0) {
373 /* Perhaps we should panic here? */
374 snprintf(console, sizeof(console) - 1, "/dev/null");
Eric Andersen07e52971999-11-07 07:38:08 +0000375 } else {
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000376 /* check for serial console and disable logging to tty5 & running a
377 * shell to tty2-4 */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000378 if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000379 log = NULL;
380 secondConsole = NULL;
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000381 thirdConsole = NULL;
382 fourthConsole = NULL;
Erik Andersenfa4718e2000-02-21 19:25:12 +0000383 /* Force the TERM setting to vt102 for serial console --
384 * iff TERM is set to linux (the default) */
385 if (strcmp( termType, "TERM=linux" ) == 0)
386 snprintf(termType, sizeof(termType) - 1, "TERM=vt102");
Erik Andersene132f4b2000-02-09 04:16:43 +0000387 message(LOG | CONSOLE,
388 "serial console detected. Disabling virtual terminals.\r\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000389 }
390 close(fd);
Eric Andersen07e52971999-11-07 07:38:08 +0000391 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000392 message(LOG, "console=%s\n", console);
Eric Andersen0460ff21999-10-25 23:32:44 +0000393}
394
Erik Andersene49d5ec2000-02-08 19:58:47 +0000395static pid_t run(char *command, char *terminal, int get_enter)
Eric Andersen0460ff21999-10-25 23:32:44 +0000396{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000397 int i, fd;
398 pid_t pid;
399 char *tmpCmd;
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000400 char *cmd[255], *cmdpath;
Erik Andersene132f4b2000-02-09 04:16:43 +0000401 char buf[255];
Erik Andersene49d5ec2000-02-08 19:58:47 +0000402 static const char press_enter[] =
403
Eric Andersen38624232001-01-25 00:04:16 +0000404#ifdef CUSTOMIZED_BANNER
405#include CUSTOMIZED_BANNER
406#endif
407
Erik Andersene49d5ec2000-02-08 19:58:47 +0000408 "\nPlease press Enter to activate this console. ";
409 char *environment[] = {
410 "HOME=/",
411 "PATH=/usr/bin:/bin:/usr/sbin:/sbin",
412 "SHELL=/bin/sh",
413 termType,
414 "USER=root",
415 0
416 };
Erik Andersenac6e71f2000-01-08 22:04:33 +0000417
Erik Andersene49d5ec2000-02-08 19:58:47 +0000418 if ((pid = fork()) == 0) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000419 /* Clean up */
Eric Andersenfb6a5082000-09-13 16:15:29 +0000420 ioctl(0, TIOCNOTTY, 0);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000421 close(0);
422 close(1);
423 close(2);
424 setsid();
Eric Andersen0460ff21999-10-25 23:32:44 +0000425
Erik Andersene49d5ec2000-02-08 19:58:47 +0000426 /* Reset signal handlers set for parent process */
427 signal(SIGUSR1, SIG_DFL);
428 signal(SIGUSR2, SIG_DFL);
429 signal(SIGINT, SIG_DFL);
430 signal(SIGTERM, SIG_DFL);
431 signal(SIGHUP, SIG_DFL);
Eric Andersen2f6c04f1999-11-01 23:59:44 +0000432
Erik Andersene49d5ec2000-02-08 19:58:47 +0000433 if ((fd = device_open(terminal, O_RDWR)) < 0) {
434 message(LOG | CONSOLE, "Bummer, can't open %s\r\n", terminal);
435 exit(1);
436 }
437 dup2(fd, 0);
438 dup2(fd, 1);
439 dup2(fd, 2);
Eric Andersenfb6a5082000-09-13 16:15:29 +0000440 ioctl(0, TIOCSCTTY, 1);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000441 tcsetpgrp(0, getpgrp());
442 set_term(0);
443
444 if (get_enter == TRUE) {
445 /*
446 * Save memory by not exec-ing anything large (like a shell)
447 * before the user wants it. This is critical if swap is not
448 * enabled and the system has low memory. Generally this will
449 * be run on the second virtual console, and the first will
450 * be allowed to start a shell or whatever an init script
451 * specifies.
452 */
Erik Andersene132f4b2000-02-09 04:16:43 +0000453#ifdef DEBUG_INIT
Erik Andersen2ac2fae2000-03-07 23:32:17 +0000454 pid_t shell_pgid = getpid();
Erik Andersene49d5ec2000-02-08 19:58:47 +0000455 message(LOG, "Waiting for enter to start '%s' (pid %d, console %s)\r\n",
456 command, shell_pgid, terminal);
Erik Andersene132f4b2000-02-09 04:16:43 +0000457#endif
Erik Andersene49d5ec2000-02-08 19:58:47 +0000458 write(fileno(stdout), press_enter, sizeof(press_enter) - 1);
Pavel Roskincbe05e42000-09-14 22:47:29 +0000459 getc(stdin);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000460 }
461
Erik Andersene49d5ec2000-02-08 19:58:47 +0000462#ifdef DEBUG_INIT
Erik Andersene132f4b2000-02-09 04:16:43 +0000463 /* Log the process name and args */
464 message(LOG, "Starting pid %d, console %s: '%s'\r\n",
465 shell_pgid, terminal, command);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000466#endif
Erik Andersene132f4b2000-02-09 04:16:43 +0000467
468 /* See if any special /bin/sh requiring characters are present */
469 if (strpbrk(command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
470 cmd[0] = SHELL;
471 cmd[1] = "-c";
472 strcpy(buf, "exec ");
473 strncat(buf, command, sizeof(buf) - strlen(buf) - 1);
474 cmd[2] = buf;
475 cmd[3] = NULL;
476 } else {
477 /* Convert command (char*) into cmd (char**, one word per string) */
478 for (tmpCmd = command, i = 0;
479 (tmpCmd = strsep(&command, " \t")) != NULL;) {
480 if (*tmpCmd != '\0') {
481 cmd[i] = tmpCmd;
482 tmpCmd++;
483 i++;
484 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000485 }
Erik Andersene132f4b2000-02-09 04:16:43 +0000486 cmd[i] = NULL;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000487 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000488
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000489 cmdpath = cmd[0];
490
491 /*
492 Interactive shells want to see a dash in argv[0]. This
493 typically is handled by login, argv will be setup this
494 way if a dash appears at the front of the command path
495 (like "-/bin/sh").
496 */
497
498 if (*cmdpath == '-') {
499 char *s;
500
501 /* skip over the dash */
502 ++cmdpath;
503
504 /* find the last component in the command pathname */
505 s = get_last_path_component(cmdpath);
506
507 /* make a new argv[0] */
508 if ((cmd[0] = malloc(strlen(s)+2)) == NULL) {
509 message(LOG | CONSOLE, "malloc failed");
510 cmd[0] = cmdpath;
511 } else {
512 cmd[0][0] = '-';
513 strcpy(cmd[0]+1, s);
514 }
515 }
516
Erik Andersen183da4a2000-04-04 18:36:37 +0000517#if defined BB_FEATURE_INIT_COREDUMPS
Erik Andersen983b51b2000-04-04 18:14:25 +0000518 {
519 struct stat sb;
520 if (stat (CORE_ENABLE_FLAG_FILE, &sb) == 0) {
521 struct rlimit limit;
522 limit.rlim_cur = RLIM_INFINITY;
523 limit.rlim_max = RLIM_INFINITY;
524 setrlimit(RLIMIT_CORE, &limit);
525 }
526 }
Erik Andersen183da4a2000-04-04 18:36:37 +0000527#endif
Erik Andersen983b51b2000-04-04 18:14:25 +0000528
Erik Andersene49d5ec2000-02-08 19:58:47 +0000529 /* Now run it. The new program will take over this PID,
530 * so nothing further in init.c should be run. */
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000531 execve(cmdpath, cmd, environment);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000532
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000533 /* We're still here? Some error happened. */
534 message(LOG | CONSOLE, "Bummer, could not run '%s': %s\n", cmdpath,
535 strerror(errno));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000536 exit(-1);
Erik Andersen05df2392000-01-13 04:43:48 +0000537 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000538 return pid;
Eric Andersen0460ff21999-10-25 23:32:44 +0000539}
540
Erik Andersene49d5ec2000-02-08 19:58:47 +0000541static int waitfor(char *command, char *terminal, int get_enter)
Erik Andersen0e3782f2000-01-07 02:54:55 +0000542{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000543 int status, wpid;
544 int pid = run(command, terminal, get_enter);
Erik Andersen0e3782f2000-01-07 02:54:55 +0000545
Erik Andersene49d5ec2000-02-08 19:58:47 +0000546 while (1) {
547 wpid = wait(&status);
Erik Andersene132f4b2000-02-09 04:16:43 +0000548 if (wpid > 0 && wpid != pid) {
549 continue;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000550 }
551 if (wpid == pid)
552 break;
Erik Andersen0e3782f2000-01-07 02:54:55 +0000553 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000554 return wpid;
Erik Andersen0e3782f2000-01-07 02:54:55 +0000555}
556
Eric Andersen219d6f51999-11-02 19:43:01 +0000557/* Make sure there is enough memory to do something useful. *
Erik Andersene132f4b2000-02-09 04:16:43 +0000558 * Calls "swapon -a" if needed so be sure /etc/fstab is present... */
Eric Andersen219d6f51999-11-02 19:43:01 +0000559static void check_memory()
560{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000561 struct stat statBuf;
Eric Andersen219d6f51999-11-02 19:43:01 +0000562
Erik Andersend07ee462000-02-21 21:26:32 +0000563 if (check_free_memory() > 1000)
Erik Andersene49d5ec2000-02-08 19:58:47 +0000564 return;
565
566 if (stat("/etc/fstab", &statBuf) == 0) {
Erik Andersen61677fe2000-04-13 01:18:56 +0000567 /* swapon -a requires /proc typically */
568 waitfor("mount proc /proc -t proc", console, FALSE);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000569 /* Try to turn on swap */
Erik Andersen61677fe2000-04-13 01:18:56 +0000570 waitfor("swapon -a", console, FALSE);
Erik Andersend07ee462000-02-21 21:26:32 +0000571 if (check_free_memory() < 1000)
Erik Andersene49d5ec2000-02-08 19:58:47 +0000572 goto goodnight;
573 } else
574 goto goodnight;
Eric Andersen219d6f51999-11-02 19:43:01 +0000575 return;
576
Erik Andersene49d5ec2000-02-08 19:58:47 +0000577 goodnight:
578 message(CONSOLE,
579 "Sorry, your computer does not have enough memory.\r\n");
580 while (1)
581 sleep(1);
Eric Andersen219d6f51999-11-02 19:43:01 +0000582}
583
Erik Andersene132f4b2000-02-09 04:16:43 +0000584/* Run all commands to be run right before halt/reboot */
585static void run_lastAction(void)
586{
587 initAction *a;
588 for (a = initActionList; a; a = a->nextPtr) {
589 if (a->action == CTRLALTDEL) {
590 waitfor(a->process, a->console, FALSE);
591 delete_initAction(a);
592 }
593 }
594}
595
596
Erik Andersen7dc16072000-01-04 01:10:25 +0000597#ifndef DEBUG_INIT
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000598static void shutdown_system(void)
Eric Andersencc8ed391999-10-05 16:24:54 +0000599{
Erik Andersene132f4b2000-02-09 04:16:43 +0000600
Erik Andersene49d5ec2000-02-08 19:58:47 +0000601 /* first disable our SIGHUP signal */
602 signal(SIGHUP, SIG_DFL);
Erik Andersen7dc16072000-01-04 01:10:25 +0000603
Erik Andersene49d5ec2000-02-08 19:58:47 +0000604 /* Allow Ctrl-Alt-Del to reboot system. */
Erik Andersen4f3f7572000-04-28 00:18:56 +0000605 init_reboot(RB_ENABLE_CAD);
Erik Andersene132f4b2000-02-09 04:16:43 +0000606
607 message(CONSOLE|LOG, "\r\nThe system is going down NOW !!\r\n");
Eric Andersencf8c9cf1999-11-05 00:31:46 +0000608 sync();
Erik Andersene49d5ec2000-02-08 19:58:47 +0000609
610 /* Send signals to every process _except_ pid 1 */
Erik Andersene132f4b2000-02-09 04:16:43 +0000611 message(CONSOLE|LOG, "Sending SIGTERM to all processes.\r\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000612 kill(-1, SIGTERM);
Erik Andersene132f4b2000-02-09 04:16:43 +0000613 sleep(1);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000614 sync();
615
Erik Andersene132f4b2000-02-09 04:16:43 +0000616 message(CONSOLE|LOG, "Sending SIGKILL to all processes.\r\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000617 kill(-1, SIGKILL);
Erik Andersene132f4b2000-02-09 04:16:43 +0000618 sleep(1);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000619
Erik Andersene132f4b2000-02-09 04:16:43 +0000620 /* run everything to be run at "ctrlaltdel" */
621 run_lastAction();
622
Erik Andersene49d5ec2000-02-08 19:58:47 +0000623 sync();
Eric Andersenbd22ed82000-07-08 18:55:24 +0000624 if (kernelVersion > 0 && kernelVersion <= KERNEL_VERSION(2,2,11)) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000625 /* bdflush, kupdate not needed for kernels >2.2.11 */
626 bdflush(1, 0);
627 sync();
628 }
Eric Andersencc8ed391999-10-05 16:24:54 +0000629}
630
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000631static void halt_signal(int sig)
Eric Andersencc8ed391999-10-05 16:24:54 +0000632{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000633 shutdown_system();
Erik Andersene132f4b2000-02-09 04:16:43 +0000634 message(CONSOLE|LOG,
Erik Andersene49d5ec2000-02-08 19:58:47 +0000635 "The system is halted. Press %s or turn off power\r\n",
636 (secondConsole == NULL) /* serial console */
637 ? "Reset" : "CTRL-ALT-DEL");
638 sync();
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000639
Erik Andersene49d5ec2000-02-08 19:58:47 +0000640 /* allow time for last message to reach serial console */
Erik Andersene132f4b2000-02-09 04:16:43 +0000641 sleep(2);
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000642
Eric Andersenbd22ed82000-07-08 18:55:24 +0000643 if (sig == SIGUSR2 && kernelVersion >= KERNEL_VERSION(2,2,0))
Erik Andersen4f3f7572000-04-28 00:18:56 +0000644 init_reboot(RB_POWER_OFF);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000645 else
Erik Andersen4f3f7572000-04-28 00:18:56 +0000646 init_reboot(RB_HALT_SYSTEM);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000647 exit(0);
Eric Andersencc8ed391999-10-05 16:24:54 +0000648}
649
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000650static void reboot_signal(int sig)
Eric Andersencc8ed391999-10-05 16:24:54 +0000651{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000652 shutdown_system();
Erik Andersene132f4b2000-02-09 04:16:43 +0000653 message(CONSOLE|LOG, "Please stand by while rebooting the system.\r\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000654 sync();
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000655
Erik Andersene49d5ec2000-02-08 19:58:47 +0000656 /* allow time for last message to reach serial console */
657 sleep(2);
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000658
Erik Andersen4f3f7572000-04-28 00:18:56 +0000659 init_reboot(RB_AUTOBOOT);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000660 exit(0);
Eric Andersencc8ed391999-10-05 16:24:54 +0000661}
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000662
Erik Andersende552872000-01-23 01:34:05 +0000663#if defined BB_FEATURE_INIT_CHROOT
Erik Andersend07ee462000-02-21 21:26:32 +0000664
Eric Andersen38624232001-01-25 00:04:16 +0000665#warning BB_FEATURE_INIT_CHROOT is out of date and should be rewritten to us
666#warning pivot root instead. Do not even bother till this work is done...
667#warning You have been warned.
668
Erik Andersende552872000-01-23 01:34:05 +0000669static void check_chroot(int sig)
670{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000671 char *argv_init[2] = { "init", NULL, };
672 char *envp_init[3] = { "HOME=/", "TERM=linux", NULL, };
673 char rootpath[256], *tc;
674 int fd;
Erik Andersende552872000-01-23 01:34:05 +0000675
Erik Andersene49d5ec2000-02-08 19:58:47 +0000676 if ((fd = open("/proc/sys/kernel/init-chroot", O_RDONLY)) == -1) {
677 message(CONSOLE,
678 "SIGHUP recived, but could not open proc file\r\n");
679 sleep(2);
680 return;
681 }
682 if (read(fd, rootpath, sizeof(rootpath)) == -1) {
683 message(CONSOLE,
684 "SIGHUP recived, but could not read proc file\r\n");
685 sleep(2);
686 return;
687 }
688 close(fd);
689
690 if (rootpath[0] == '\0') {
691 message(CONSOLE,
692 "SIGHUP recived, but new root is not valid: %s\r\n",
693 rootpath);
694 sleep(2);
695 return;
696 }
697
698 tc = strrchr(rootpath, '\n');
699 *tc = '\0';
700
701 /* Ok, making it this far means we commit */
702 message(CONSOLE, "Please stand by, changing root to `%s'.\r\n",
703 rootpath);
704
705 /* kill all other programs first */
706 message(CONSOLE, "Sending SIGTERM to all processes.\r\n");
707 kill(-1, SIGTERM);
Erik Andersende552872000-01-23 01:34:05 +0000708 sleep(2);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000709 sync();
710
711 message(CONSOLE, "Sending SIGKILL to all processes.\r\n");
712 kill(-1, SIGKILL);
Erik Andersende552872000-01-23 01:34:05 +0000713 sleep(2);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000714 sync();
715
716 /* ok, we don't need /proc anymore. we also assume that the signaling
717 * process left the rest of the filesystems alone for us */
718 umount("/proc");
719
720 /* Ok, now we chroot. Hopefully we only have two things mounted, the
721 * new chroot'd mount point, and the old "/" mount. s,
722 * we go ahead and unmount the old "/". This should trigger the kernel
723 * to set things up the Right Way(tm). */
724
725 if (!chroot(rootpath))
726 umount("/dev/root");
727
728 /* If the chroot fails, we are already too far to turn back, so we
729 * continue and hope that executing init below will revive the system */
730
731 /* close all of our descriptors and open new ones */
732 close(0);
733 close(1);
734 close(2);
735 open("/dev/console", O_RDWR, 0);
736 dup(0);
737 dup(0);
738
739 message(CONSOLE, "Executing real init...\r\n");
740 /* execute init in the (hopefully) new root */
741 execve("/sbin/init", argv_init, envp_init);
742
743 message(CONSOLE,
744 "ERROR: Could not exec new init. Press %s to reboot.\r\n",
745 (secondConsole == NULL) /* serial console */
746 ? "Reset" : "CTRL-ALT-DEL");
Erik Andersende552872000-01-23 01:34:05 +0000747 return;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000748}
749#endif /* BB_FEATURE_INIT_CHROOT */
Erik Andersende552872000-01-23 01:34:05 +0000750
Erik Andersene49d5ec2000-02-08 19:58:47 +0000751#endif /* ! DEBUG_INIT */
Erik Andersende552872000-01-23 01:34:05 +0000752
Erik Andersene49d5ec2000-02-08 19:58:47 +0000753void new_initAction(initActionEnum action, char *process, char *cons)
Erik Andersen7dc16072000-01-04 01:10:25 +0000754{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000755 initAction *newAction;
Erik Andersen9e737252000-01-06 01:16:13 +0000756
Erik Andersene49d5ec2000-02-08 19:58:47 +0000757 if (*cons == '\0')
758 cons = console;
Erik Andersen9e737252000-01-06 01:16:13 +0000759
Erik Andersene49d5ec2000-02-08 19:58:47 +0000760 /* If BusyBox detects that a serial console is in use,
761 * then entries not refering to the console or null devices will _not_ be run.
762 * The exception to this rule is the null device.
763 */
764 if (secondConsole == NULL && strcmp(cons, console)
765 && strcmp(cons, "/dev/null"))
766 return;
767
768 newAction = calloc((size_t) (1), sizeof(initAction));
769 if (!newAction) {
770 message(LOG | CONSOLE, "Memory allocation failure\n");
771 while (1)
772 sleep(1);
773 }
774 newAction->nextPtr = initActionList;
775 initActionList = newAction;
776 strncpy(newAction->process, process, 255);
777 newAction->action = action;
778 strncpy(newAction->console, cons, 255);
779 newAction->pid = 0;
Erik Andersen31638212000-01-15 22:28:50 +0000780// message(LOG|CONSOLE, "process='%s' action='%d' console='%s'\n",
Erik Andersene49d5ec2000-02-08 19:58:47 +0000781// newAction->process, newAction->action, newAction->console);
Erik Andersen7dc16072000-01-04 01:10:25 +0000782}
783
Erik Andersene132f4b2000-02-09 04:16:43 +0000784static void delete_initAction(initAction * action)
Erik Andersen7dc16072000-01-04 01:10:25 +0000785{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000786 initAction *a, *b = NULL;
787
788 for (a = initActionList; a; b = a, a = a->nextPtr) {
789 if (a == action) {
790 if (b == NULL) {
791 initActionList = a->nextPtr;
792 } else {
793 b->nextPtr = a->nextPtr;
794 }
795 free(a);
796 break;
797 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000798 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000799}
800
Erik Andersen9e737252000-01-06 01:16:13 +0000801/* NOTE that if BB_FEATURE_USE_INITTAB is NOT defined,
802 * then parse_inittab() simply adds in some default
803 * actions(i.e runs INIT_SCRIPT and then starts a pair
Erik Andersen812d4662000-01-07 18:30:40 +0000804 * of "askfirst" shells). If BB_FEATURE_USE_INITTAB
805 * _is_ defined, but /etc/inittab is missing, this
806 * results in the same set of default behaviors.
Erik Andersen9e737252000-01-06 01:16:13 +0000807 * */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000808void parse_inittab(void)
Erik Andersen7dc16072000-01-04 01:10:25 +0000809{
Erik Andersen9e737252000-01-06 01:16:13 +0000810#ifdef BB_FEATURE_USE_INITTAB
Erik Andersene49d5ec2000-02-08 19:58:47 +0000811 FILE *file;
812 char buf[256], lineAsRead[256], tmpConsole[256];
Eric Andersenb5966362000-05-31 20:04:38 +0000813 char *id, *runlev, *action, *process, *eol;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000814 const struct initActionType *a = actions;
815 int foundIt;
Erik Andersen7dc16072000-01-04 01:10:25 +0000816
817
Erik Andersene49d5ec2000-02-08 19:58:47 +0000818 file = fopen(INITTAB, "r");
819 if (file == NULL) {
820 /* No inittab file -- set up some default behavior */
Erik Andersen9e737252000-01-06 01:16:13 +0000821#endif
Erik Andersene132f4b2000-02-09 04:16:43 +0000822 /* Swapoff on halt/reboot */
Pavel Roskin33bee332000-09-15 01:02:50 +0000823 new_initAction(CTRLALTDEL, "/sbin/swapoff -a", console);
Erik Andersene132f4b2000-02-09 04:16:43 +0000824 /* Umount all filesystems on halt/reboot */
Pavel Roskin33bee332000-09-15 01:02:50 +0000825 new_initAction(CTRLALTDEL, "/bin/umount -a -r", console);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000826 /* Askfirst shell on tty1 */
827 new_initAction(ASKFIRST, SHELL, console);
828 /* Askfirst shell on tty2 */
829 if (secondConsole != NULL)
830 new_initAction(ASKFIRST, SHELL, secondConsole);
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000831 /* Askfirst shell on tty3 */
832 if (thirdConsole != NULL)
833 new_initAction(ASKFIRST, SHELL, thirdConsole);
834 /* Askfirst shell on tty4 */
835 if (fourthConsole != NULL)
836 new_initAction(ASKFIRST, SHELL, fourthConsole);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000837 /* sysinit */
838 new_initAction(SYSINIT, INIT_SCRIPT, console);
Erik Andersen7dc16072000-01-04 01:10:25 +0000839
Erik Andersene49d5ec2000-02-08 19:58:47 +0000840 return;
Erik Andersen9e737252000-01-06 01:16:13 +0000841#ifdef BB_FEATURE_USE_INITTAB
Erik Andersen9e737252000-01-06 01:16:13 +0000842 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000843
Erik Andersene49d5ec2000-02-08 19:58:47 +0000844 while (fgets(buf, 255, file) != NULL) {
845 foundIt = FALSE;
Eric Andersenb5966362000-05-31 20:04:38 +0000846 /* Skip leading spaces */
847 for (id = buf; *id == ' ' || *id == '\t'; id++);
848
849 /* Skip the line if it's a comment */
850 if (*id == '#' || *id == '\n')
Erik Andersene49d5ec2000-02-08 19:58:47 +0000851 continue;
Erik Andersen7dc16072000-01-04 01:10:25 +0000852
Erik Andersene49d5ec2000-02-08 19:58:47 +0000853 /* Trim the trailing \n */
Eric Andersenb5966362000-05-31 20:04:38 +0000854 eol = strrchr(id, '\n');
855 if (eol != NULL)
856 *eol = '\0';
Erik Andersen7dc16072000-01-04 01:10:25 +0000857
Erik Andersene49d5ec2000-02-08 19:58:47 +0000858 /* Keep a copy around for posterity's sake (and error msgs) */
859 strcpy(lineAsRead, buf);
860
Eric Andersenb5966362000-05-31 20:04:38 +0000861 /* Separate the ID field from the runlevels */
862 runlev = strchr(id, ':');
863 if (runlev == NULL || *(runlev + 1) == '\0') {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000864 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
865 continue;
866 } else {
Eric Andersenb5966362000-05-31 20:04:38 +0000867 *runlev = '\0';
868 ++runlev;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000869 }
870
Eric Andersenb5966362000-05-31 20:04:38 +0000871 /* Separate the runlevels from the action */
872 action = strchr(runlev, ':');
873 if (action == NULL || *(action + 1) == '\0') {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000874 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
875 continue;
876 } else {
Eric Andersenb5966362000-05-31 20:04:38 +0000877 *action = '\0';
878 ++action;
879 }
880
881 /* Separate the action from the process */
882 process = strchr(action, ':');
883 if (process == NULL || *(process + 1) == '\0') {
884 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
885 continue;
886 } else {
887 *process = '\0';
888 ++process;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000889 }
890
891 /* Ok, now process it */
892 a = actions;
893 while (a->name != 0) {
Eric Andersenb5966362000-05-31 20:04:38 +0000894 if (strcmp(a->name, action) == 0) {
895 if (*id != '\0') {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000896 struct stat statBuf;
897
898 strcpy(tmpConsole, "/dev/");
Eric Andersenb5966362000-05-31 20:04:38 +0000899 strncat(tmpConsole, id, 200);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000900 if (stat(tmpConsole, &statBuf) != 0) {
901 message(LOG | CONSOLE,
902 "device '%s' does not exist. Did you read the directions?\n",
903 tmpConsole);
904 break;
905 }
Eric Andersenb5966362000-05-31 20:04:38 +0000906 id = tmpConsole;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000907 }
Eric Andersenb5966362000-05-31 20:04:38 +0000908 new_initAction(a->action, process, id);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000909 foundIt = TRUE;
910 }
911 a++;
912 }
913 if (foundIt == TRUE)
914 continue;
915 else {
916 /* Choke on an unknown action */
917 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
918 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000919 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000920 return;
Erik Andersen42094cd2000-03-20 21:34:52 +0000921#endif /* BB_FEATURE_USE_INITTAB */
Erik Andersen7dc16072000-01-04 01:10:25 +0000922}
923
Erik Andersene132f4b2000-02-09 04:16:43 +0000924
925
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000926extern int init_main(int argc, char **argv)
Eric Andersen0460ff21999-10-25 23:32:44 +0000927{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000928 initAction *a;
929 pid_t wpid;
930 int status;
Eric Andersen0460ff21999-10-25 23:32:44 +0000931
Eric Andersend73dc5b1999-11-10 23:13:02 +0000932#ifndef DEBUG_INIT
Erik Andersena51ecdd2000-02-24 18:09:58 +0000933 /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
934 if (getpid() != 1
935#ifdef BB_FEATURE_LINUXRC
Matt Kraaie58771e2000-07-12 15:38:49 +0000936 && strstr(applet_name, "linuxrc") == NULL
Erik Andersena51ecdd2000-02-24 18:09:58 +0000937#endif
938 )
939 {
Eric Andersen67991cf2001-02-14 21:23:06 +0000940 show_usage();
Erik Andersene49d5ec2000-02-08 19:58:47 +0000941 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000942 /* Set up sig handlers -- be sure to
943 * clear all of these in run() */
944 signal(SIGUSR1, halt_signal);
Eric Andersen4c95a282000-07-07 19:30:28 +0000945 signal(SIGUSR2, halt_signal);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000946 signal(SIGINT, reboot_signal);
947 signal(SIGTERM, reboot_signal);
Erik Andersende552872000-01-23 01:34:05 +0000948#if defined BB_FEATURE_INIT_CHROOT
Erik Andersene49d5ec2000-02-08 19:58:47 +0000949 signal(SIGHUP, check_chroot);
Erik Andersende552872000-01-23 01:34:05 +0000950#endif
Eric Andersen0460ff21999-10-25 23:32:44 +0000951
Erik Andersene49d5ec2000-02-08 19:58:47 +0000952 /* Turn off rebooting via CTL-ALT-DEL -- we get a
953 * SIGINT on CAD so we can shut things down gracefully... */
Erik Andersen4f3f7572000-04-28 00:18:56 +0000954 init_reboot(RB_DISABLE_CAD);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000955#endif
Erik Andersen05df2392000-01-13 04:43:48 +0000956
Erik Andersen298854f2000-03-23 01:09:18 +0000957 /* Figure out what kernel this is running */
958 kernelVersion = get_kernel_revision();
959
Erik Andersene49d5ec2000-02-08 19:58:47 +0000960 /* Figure out where the default console should be */
961 console_init();
Eric Andersen0460ff21999-10-25 23:32:44 +0000962
Erik Andersene49d5ec2000-02-08 19:58:47 +0000963 /* Close whatever files are open, and reset the console. */
964 close(0);
965 close(1);
966 close(2);
967 set_term(0);
Erik Andersen983b51b2000-04-04 18:14:25 +0000968 chdir("/");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000969 setsid();
Eric Andersencc8ed391999-10-05 16:24:54 +0000970
Erik Andersene49d5ec2000-02-08 19:58:47 +0000971 /* Make sure PATH is set to something sane */
972 putenv(_PATH_STDPATH);
Eric Andersencc8ed391999-10-05 16:24:54 +0000973
Erik Andersene49d5ec2000-02-08 19:58:47 +0000974 /* Hello world */
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000975#ifndef DEBUG_INIT
Erik Andersenea6b67d2000-03-07 07:47:10 +0000976 message(
977#if ! defined BB_FEATURE_EXTRA_QUIET
978 CONSOLE|
979#endif
980 LOG,
Pavel Roskin9c5fcc32000-07-17 23:45:12 +0000981 "init started: %s\r\n", full_version);
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000982#else
Erik Andersenea6b67d2000-03-07 07:47:10 +0000983 message(
984#if ! defined BB_FEATURE_EXTRA_QUIET
985 CONSOLE|
986#endif
987 LOG,
Pavel Roskin9c5fcc32000-07-17 23:45:12 +0000988 "init(%d) started: %s\r\n", getpid(), full_version);
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000989#endif
Eric Andersencc8ed391999-10-05 16:24:54 +0000990
Eric Andersencc8ed391999-10-05 16:24:54 +0000991
Erik Andersene49d5ec2000-02-08 19:58:47 +0000992 /* Make sure there is enough memory to do something useful. */
993 check_memory();
Erik Andersen9e737252000-01-06 01:16:13 +0000994
Erik Andersene49d5ec2000-02-08 19:58:47 +0000995 /* Check if we are supposed to be in single user mode */
996 if (argc > 1 && (!strcmp(argv[1], "single") ||
997 !strcmp(argv[1], "-s") || !strcmp(argv[1], "1"))) {
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000998 /* Ask first then start a shell on tty2-4 */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000999 if (secondConsole != NULL)
1000 new_initAction(ASKFIRST, SHELL, secondConsole);
Eric Andersen7e3bf6e2000-09-14 22:01:31 +00001001 if (thirdConsole != NULL)
1002 new_initAction(ASKFIRST, SHELL, thirdConsole);
1003 if (fourthConsole != NULL)
1004 new_initAction(ASKFIRST, SHELL, fourthConsole);
Erik Andersene49d5ec2000-02-08 19:58:47 +00001005 /* Start a shell on tty1 */
1006 new_initAction(RESPAWN, SHELL, console);
1007 } else {
1008 /* Not in single user mode -- see what inittab says */
Eric Andersen8a8fbb81999-10-26 00:18:56 +00001009
Erik Andersene49d5ec2000-02-08 19:58:47 +00001010 /* NOTE that if BB_FEATURE_USE_INITTAB is NOT defined,
1011 * then parse_inittab() simply adds in some default
1012 * actions(i.e runs INIT_SCRIPT and then starts a pair
1013 * of "askfirst" shells */
1014 parse_inittab();
Eric Andersend00c2621999-12-07 08:37:31 +00001015 }
Erik Andersen983b51b2000-04-04 18:14:25 +00001016
Erik Andersene132f4b2000-02-09 04:16:43 +00001017 /* Fix up argv[0] to be certain we claim to be init */
Eric Andersenf34aa4c2000-09-21 02:32:11 +00001018 argv[0]="init";
1019
Erik Andersen07f56042000-02-09 06:05:01 +00001020 if (argc > 1)
Eric Andersen53cfb7e2001-01-31 17:29:47 +00001021 argv[1][0]=0;
Eric Andersen219d6f51999-11-02 19:43:01 +00001022
Erik Andersene49d5ec2000-02-08 19:58:47 +00001023 /* Now run everything that needs to be run */
1024
1025 /* First run the sysinit command */
1026 for (a = initActionList; a; a = a->nextPtr) {
1027 if (a->action == SYSINIT) {
1028 waitfor(a->process, a->console, FALSE);
1029 /* Now remove the "sysinit" entry from the list */
1030 delete_initAction(a);
Erik Andersen7dc16072000-01-04 01:10:25 +00001031 }
Erik Andersen7dc16072000-01-04 01:10:25 +00001032 }
Erik Andersene49d5ec2000-02-08 19:58:47 +00001033 /* Next run anything that wants to block */
1034 for (a = initActionList; a; a = a->nextPtr) {
1035 if (a->action == WAIT) {
1036 waitfor(a->process, a->console, FALSE);
1037 /* Now remove the "wait" entry from the list */
1038 delete_initAction(a);
Erik Andersen7dc16072000-01-04 01:10:25 +00001039 }
Eric Andersen8a8fbb81999-10-26 00:18:56 +00001040 }
Erik Andersene49d5ec2000-02-08 19:58:47 +00001041 /* Next run anything to be run only once */
1042 for (a = initActionList; a; a = a->nextPtr) {
1043 if (a->action == ONCE) {
1044 run(a->process, a->console, FALSE);
1045 /* Now remove the "once" entry from the list */
1046 delete_initAction(a);
1047 }
1048 }
1049 /* If there is nothing else to do, stop */
1050 if (initActionList == NULL) {
1051 message(LOG | CONSOLE,
1052 "No more tasks for init -- sleeping forever.\n");
1053 while (1)
1054 sleep(1);
1055 }
1056
1057 /* Now run the looping stuff for the rest of forever */
1058 while (1) {
1059 for (a = initActionList; a; a = a->nextPtr) {
1060 /* Only run stuff with pid==0. If they have
1061 * a pid, that means they are still running */
1062 if (a->pid == 0) {
1063 switch (a->action) {
1064 case RESPAWN:
1065 /* run the respawn stuff */
1066 a->pid = run(a->process, a->console, FALSE);
1067 break;
1068 case ASKFIRST:
1069 /* run the askfirst stuff */
1070 a->pid = run(a->process, a->console, TRUE);
1071 break;
1072 /* silence the compiler's incessant whining */
1073 default:
1074 break;
1075 }
1076 }
1077 }
1078 /* Wait for a child process to exit */
1079 wpid = wait(&status);
1080 if (wpid > 0) {
1081 /* Find out who died and clean up their corpse */
1082 for (a = initActionList; a; a = a->nextPtr) {
1083 if (a->pid == wpid) {
1084 a->pid = 0;
1085 message(LOG,
1086 "Process '%s' (pid %d) exited. Scheduling it for restart.\n",
1087 a->process, wpid);
1088 }
1089 }
1090 }
1091 sleep(1);
1092 }
Eric Andersencc8ed391999-10-05 16:24:54 +00001093}
Erik Andersen029011b2000-03-04 21:19:32 +00001094
1095/*
1096Local Variables:
1097c-file-style: "linux"
1098c-basic-offset: 4
1099tab-width: 4
1100End:
1101*/