blob: c960fe333ddbee7079436702062a51175e323b1f [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 Andersencc8ed391999-10-05 16:24:54 +000030#include "internal.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>
40#include <asm/types.h>
41#include <linux/serial.h> /* for serial_struct */
42#include <linux/version.h>
43#include <linux/reboot.h>
44#include <linux/unistd.h>
Eric Andersen1e03add2000-07-06 09:56:35 +000045#include <linux/vt.h> /* for vt_stat */
Erik Andersen42094cd2000-03-20 21:34:52 +000046#include <sys/fcntl.h>
47#include <sys/ioctl.h>
Eric Andersencc8ed391999-10-05 16:24:54 +000048#include <sys/mount.h>
Erik Andersen42094cd2000-03-20 21:34:52 +000049#include <sys/types.h>
Erik Andersen42094cd2000-03-20 21:34:52 +000050#include <sys/wait.h>
Erik Andersen4f3f7572000-04-28 00:18:56 +000051#ifdef BB_SYSLOGD
52# include <sys/syslog.h>
53#endif
54
55
56#ifndef RB_HALT_SYSTEM
57#define RB_HALT_SYSTEM 0xcdef0123
58#define RB_ENABLE_CAD 0x89abcdef
59#define RB_DISABLE_CAD 0
60#define RB_POWER_OFF 0x4321fedc
61#define RB_AUTOBOOT 0x01234567
62#if defined(__GLIBC__)
63#include <sys/reboot.h>
64 #define init_reboot(magic) reboot(magic)
65#else
66 #define init_reboot(magic) reboot(0xfee1dead, 672274793, magic)
67#endif
68#endif
69
70#ifndef _PATH_STDPATH
71#define _PATH_STDPATH "/usr/bin:/bin:/usr/sbin:/sbin"
72#endif
Eric Andersencc8ed391999-10-05 16:24:54 +000073
Erik Andersen983b51b2000-04-04 18:14:25 +000074
Erik Andersen183da4a2000-04-04 18:36:37 +000075#if defined BB_FEATURE_INIT_COREDUMPS
Erik Andersen983b51b2000-04-04 18:14:25 +000076/*
Erik Andersen183da4a2000-04-04 18:36:37 +000077 * When a file named CORE_ENABLE_FLAG_FILE exists, setrlimit is called
78 * before processes are spawned to set core file size as unlimited.
79 * This is for debugging only. Don't use this is production, unless
80 * you want core dumps lying about....
Erik Andersen983b51b2000-04-04 18:14:25 +000081 */
82#define CORE_ENABLE_FLAG_FILE "/.init_enable_core"
83#include <sys/resource.h>
84#include <sys/time.h>
Erik Andersen183da4a2000-04-04 18:36:37 +000085#endif
Erik Andersen983b51b2000-04-04 18:14:25 +000086
Erik Andersen4d1d0111999-12-17 18:44:15 +000087#ifndef KERNEL_VERSION
88#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
89#endif
90
Erik Andersen4f3f7572000-04-28 00:18:56 +000091#if defined(__GLIBC__)
92#include <sys/kdaemon.h>
93#else
Eric Andersena15cd0b2000-06-19 18:14:20 +000094static _syscall2(int, bdflush, int, func, int, data);
Erik Andersen4f3f7572000-04-28 00:18:56 +000095#endif /* __GLIBC__ */
96
Eric Andersen0ecb54a1999-12-05 23:24:55 +000097
Erik Andersen42094cd2000-03-20 21:34:52 +000098#define VT_PRIMARY "/dev/tty1" /* Primary virtual console */
99#define VT_SECONDARY "/dev/tty2" /* Virtual console */
100#define VT_LOG "/dev/tty3" /* Virtual console */
101#define SERIAL_CON0 "/dev/ttyS0" /* Primary serial console */
102#define SERIAL_CON1 "/dev/ttyS1" /* Serial console */
103#define SHELL "/bin/sh" /* Default shell */
104#define INITTAB "/etc/inittab" /* inittab file location */
Erik Andersen96e2abd2000-01-07 11:40:44 +0000105#ifndef INIT_SCRIPT
Erik Andersen42094cd2000-03-20 21:34:52 +0000106#define INIT_SCRIPT "/etc/init.d/rcS" /* Default sysinit script. */
Erik Andersen96e2abd2000-01-07 11:40:44 +0000107#endif
Erik Andersen9c88cac1999-12-30 09:25:17 +0000108
Erik Andersen42094cd2000-03-20 21:34:52 +0000109#define LOG 0x1
110#define CONSOLE 0x2
Erik Andersen7dc16072000-01-04 01:10:25 +0000111
112/* Allowed init action types */
113typedef enum {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000114 SYSINIT = 1,
115 RESPAWN,
116 ASKFIRST,
117 WAIT,
Erik Andersene132f4b2000-02-09 04:16:43 +0000118 ONCE,
119 CTRLALTDEL
Erik Andersen7dc16072000-01-04 01:10:25 +0000120} initActionEnum;
121
Erik Andersen42094cd2000-03-20 21:34:52 +0000122/* A mapping between "inittab" action name strings and action type codes. */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000123typedef struct initActionType {
124 const char *name;
125 initActionEnum action;
Erik Andersen7dc16072000-01-04 01:10:25 +0000126} initActionType;
127
128static const struct initActionType actions[] = {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000129 {"sysinit", SYSINIT},
130 {"respawn", RESPAWN},
131 {"askfirst", ASKFIRST},
132 {"wait", WAIT},
133 {"once", ONCE},
Erik Andersene132f4b2000-02-09 04:16:43 +0000134 {"ctrlaltdel", CTRLALTDEL},
Erik Andersene49d5ec2000-02-08 19:58:47 +0000135 {0}
Erik Andersen7dc16072000-01-04 01:10:25 +0000136};
137
Erik Andersen42094cd2000-03-20 21:34:52 +0000138/* Set up a linked list of initActions, to be read from inittab */
Erik Andersen7dc16072000-01-04 01:10:25 +0000139typedef struct initActionTag initAction;
140struct initActionTag {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000141 pid_t pid;
142 char process[256];
143 char console[256];
144 initAction *nextPtr;
145 initActionEnum action;
Erik Andersen7dc16072000-01-04 01:10:25 +0000146};
Erik Andersene49d5ec2000-02-08 19:58:47 +0000147initAction *initActionList = NULL;
Erik Andersen7dc16072000-01-04 01:10:25 +0000148
149
Erik Andersenac6e71f2000-01-08 22:04:33 +0000150static char *secondConsole = VT_SECONDARY;
Erik Andersen42094cd2000-03-20 21:34:52 +0000151static char *log = VT_LOG;
152static int kernelVersion = 0;
153static char termType[32] = "TERM=linux";
154static char console[32] = _PATH_CONSOLE;
155
Erik Andersene132f4b2000-02-09 04:16:43 +0000156static void delete_initAction(initAction * action);
Eric Andersen0460ff21999-10-25 23:32:44 +0000157
158
Erik Andersen42094cd2000-03-20 21:34:52 +0000159/* Print a message to the specified device.
160 * Device may be bitwise-or'd from LOG | CONSOLE */
161static void message(int device, char *fmt, ...)
Erik Andersen93d65132000-04-06 08:06:36 +0000162 __attribute__ ((format (printf, 2, 3)));
163static void message(int device, char *fmt, ...)
Eric Andersen0460ff21999-10-25 23:32:44 +0000164{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000165 va_list arguments;
166 int fd;
Erik Andersen7dc16072000-01-04 01:10:25 +0000167
Eric Andersen4c781471999-11-26 08:12:56 +0000168#ifdef BB_SYSLOGD
169
Erik Andersene49d5ec2000-02-08 19:58:47 +0000170 /* Log the message to syslogd */
171 if (device & LOG) {
172 char msg[1024];
Eric Andersen4c781471999-11-26 08:12:56 +0000173
Erik Andersene49d5ec2000-02-08 19:58:47 +0000174 va_start(arguments, fmt);
175 vsnprintf(msg, sizeof(msg), fmt, arguments);
176 va_end(arguments);
Erik Andersene132f4b2000-02-09 04:16:43 +0000177 openlog("init", 0, LOG_USER);
178 syslog(LOG_USER|LOG_INFO, msg);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000179 closelog();
Eric Andersen3ae0c781999-11-04 01:13:21 +0000180 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000181#else
182 static int log_fd = -1;
183
184 /* Take full control of the log tty, and never close it.
185 * It's mine, all mine! Muhahahaha! */
186 if (log_fd < 0) {
187 if (log == NULL) {
188 /* don't even try to log, because there is no such console */
189 log_fd = -2;
190 /* log to main console instead */
191 device = CONSOLE;
Erik Andersene132f4b2000-02-09 04:16:43 +0000192 } else if ((log_fd = device_open(log, O_RDWR|O_NDELAY)) < 0) {
193 log_fd = -2;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000194 fprintf(stderr, "Bummer, can't write to log on %s!\r\n", log);
195 fflush(stderr);
Erik Andersene132f4b2000-02-09 04:16:43 +0000196 log = NULL;
197 device = CONSOLE;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000198 }
199 }
200 if ((device & LOG) && (log_fd >= 0)) {
201 va_start(arguments, fmt);
202 vdprintf(log_fd, fmt, arguments);
203 va_end(arguments);
204 }
Eric Andersen4c781471999-11-26 08:12:56 +0000205#endif
206
Erik Andersene49d5ec2000-02-08 19:58:47 +0000207 if (device & CONSOLE) {
208 /* Always send console messages to /dev/console so people will see them. */
209 if (
210 (fd =
211 device_open(_PATH_CONSOLE,
212 O_WRONLY | O_NOCTTY | O_NDELAY)) >= 0) {
213 va_start(arguments, fmt);
214 vdprintf(fd, fmt, arguments);
215 va_end(arguments);
216 close(fd);
217 } else {
218 fprintf(stderr, "Bummer, can't print: ");
219 va_start(arguments, fmt);
220 vfprintf(stderr, fmt, arguments);
221 fflush(stderr);
222 va_end(arguments);
223 }
Eric Andersen3ae0c781999-11-04 01:13:21 +0000224 }
Eric Andersencc8ed391999-10-05 16:24:54 +0000225}
226
Erik Andersen1d1d9502000-04-21 01:26:49 +0000227#define CTRLCHAR(ch) ((ch)&0x1f)
Eric Andersen3ae0c781999-11-04 01:13:21 +0000228
Eric Andersen0460ff21999-10-25 23:32:44 +0000229/* Set terminal settings to reasonable defaults */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000230void set_term(int fd)
Eric Andersencc8ed391999-10-05 16:24:54 +0000231{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000232 struct termios tty;
Eric Andersencc8ed391999-10-05 16:24:54 +0000233
Erik Andersene49d5ec2000-02-08 19:58:47 +0000234 tcgetattr(fd, &tty);
Eric Andersencc8ed391999-10-05 16:24:54 +0000235
Erik Andersene49d5ec2000-02-08 19:58:47 +0000236 /* set control chars */
Erik Andersen1d1d9502000-04-21 01:26:49 +0000237 tty.c_cc[VINTR] = CTRLCHAR('C'); /* Ctrl-C */
238 tty.c_cc[VQUIT] = CTRLCHAR('\\'); /* Ctrl-\ */
239 tty.c_cc[VERASE] = CTRLCHAR('?'); /* Ctrl-? */
240 tty.c_cc[VKILL] = CTRLCHAR('U'); /* Ctrl-U */
241 tty.c_cc[VEOF] = CTRLCHAR('D'); /* Ctrl-D */
Erik Andersen1d1d9502000-04-21 01:26:49 +0000242 tty.c_cc[VSTART] = CTRLCHAR('Q'); /* Ctrl-Q */
Eric Andersena5dbb392000-07-06 19:11:34 +0000243 tty.c_cc[VSTOP] = CTRLCHAR('S'); /* Ctrl-S */
Erik Andersen1d1d9502000-04-21 01:26:49 +0000244 tty.c_cc[VSUSP] = CTRLCHAR('Z'); /* Ctrl-Z */
Eric Andersena5dbb392000-07-06 19:11:34 +0000245
Erik Andersene49d5ec2000-02-08 19:58:47 +0000246 /* use line dicipline 0 */
247 tty.c_line = 0;
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000248
Erik Andersene49d5ec2000-02-08 19:58:47 +0000249 /* Make it be sane */
Erik Andersen6c41c442000-03-19 05:13:49 +0000250 tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD;
251 tty.c_cflag |= HUPCL|CLOCAL;
Eric Andersen08b10341999-11-19 02:38:58 +0000252
Erik Andersene49d5ec2000-02-08 19:58:47 +0000253 /* input modes */
254 tty.c_iflag = ICRNL | IXON | IXOFF;
Eric Andersen08b10341999-11-19 02:38:58 +0000255
Erik Andersene49d5ec2000-02-08 19:58:47 +0000256 /* output modes */
257 tty.c_oflag = OPOST | ONLCR;
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000258
Erik Andersene49d5ec2000-02-08 19:58:47 +0000259 /* local modes */
260 tty.c_lflag =
261 ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN;
Eric Andersencc8ed391999-10-05 16:24:54 +0000262
Erik Andersene49d5ec2000-02-08 19:58:47 +0000263 tcsetattr(fd, TCSANOW, &tty);
Eric Andersencc8ed391999-10-05 16:24:54 +0000264}
265
Eric Andersen219d6f51999-11-02 19:43:01 +0000266/* How much memory does this machine have? */
Erik Andersend07ee462000-02-21 21:26:32 +0000267static int check_free_memory()
Eric Andersencc8ed391999-10-05 16:24:54 +0000268{
Erik Andersend07ee462000-02-21 21:26:32 +0000269 struct sysinfo info;
Eric Andersencc8ed391999-10-05 16:24:54 +0000270
Eric Andersen10dc9d42000-06-26 10:45:52 +0000271 /* Pre initialize mem_unit in case this kernel is something prior to
272 * the linux 2.4 kernel (which will actually fill in mem_unit... */
Erik Andersend07ee462000-02-21 21:26:32 +0000273 sysinfo(&info);
274 if (sysinfo(&info) != 0) {
Eric Andersen10dc9d42000-06-26 10:45:52 +0000275 printf("Error checking free memory: %s\n", strerror(errno));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000276 return -1;
Eric Andersenabc7d591999-10-19 00:27:50 +0000277 }
Eric Andersen10dc9d42000-06-26 10:45:52 +0000278 if (info.mem_unit==0) {
279 /* Looks like we have a kernel prior to Linux 2.4.x */
280 info.mem_unit=1024;
281 info.totalram/=info.mem_unit;
282 info.totalswap/=info.mem_unit;
283 } else {
284 /* Bah. Linux 2.4.x completely changed sysinfo. This can in theory
285 overflow a 32 bit unsigned long, but who puts more then 4GiB ram+swap
286 on an embedded system? */
287 info.mem_unit/=1024;
288 info.totalram*=info.mem_unit;
289 info.totalswap*=info.mem_unit;
290 }
Erik Andersend07ee462000-02-21 21:26:32 +0000291
Eric Andersen10dc9d42000-06-26 10:45:52 +0000292 return(info.totalram+info.totalswap);
Eric Andersencc8ed391999-10-05 16:24:54 +0000293}
294
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000295static void console_init()
Eric Andersen0460ff21999-10-25 23:32:44 +0000296{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000297 int fd;
298 int tried_devcons = 0;
299 int tried_vtprimary = 0;
Erik Andersen029011b2000-03-04 21:19:32 +0000300 struct vt_stat vt;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000301 struct serial_struct sr;
302 char *s;
Eric Andersen0460ff21999-10-25 23:32:44 +0000303
Erik Andersene49d5ec2000-02-08 19:58:47 +0000304 if ((s = getenv("TERM")) != NULL) {
305 snprintf(termType, sizeof(termType) - 1, "TERM=%s", s);
306 }
Erik Andersenac6e71f2000-01-08 22:04:33 +0000307
Erik Andersene49d5ec2000-02-08 19:58:47 +0000308 if ((s = getenv("CONSOLE")) != NULL) {
309 snprintf(console, sizeof(console) - 1, "%s", s);
310 }
Eric Andersenfbb39c81999-11-08 17:00:52 +0000311#if #cpu(sparc)
Erik Andersene49d5ec2000-02-08 19:58:47 +0000312 /* sparc kernel supports console=tty[ab] parameter which is also
313 * passed to init, so catch it here */
314 else if ((s = getenv("console")) != NULL) {
315 /* remap tty[ab] to /dev/ttyS[01] */
316 if (strcmp(s, "ttya") == 0)
317 snprintf(console, sizeof(console) - 1, "%s", SERIAL_CON0);
318 else if (strcmp(s, "ttyb") == 0)
319 snprintf(console, sizeof(console) - 1, "%s", SERIAL_CON1);
320 }
Eric Andersen219d6f51999-11-02 19:43:01 +0000321#endif
Erik Andersene49d5ec2000-02-08 19:58:47 +0000322 else {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000323 /* 2.2 kernels: identify the real console backend and try to use it */
324 if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
325 /* this is a serial console */
326 snprintf(console, sizeof(console) - 1, "/dev/ttyS%d", sr.line);
327 } else if (ioctl(0, VT_GETSTATE, &vt) == 0) {
328 /* this is linux virtual tty */
329 snprintf(console, sizeof(console) - 1, "/dev/tty%d",
330 vt.v_active);
331 } else {
332 snprintf(console, sizeof(console) - 1, "%s", _PATH_CONSOLE);
333 tried_devcons++;
334 }
Eric Andersen07e52971999-11-07 07:38:08 +0000335 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000336
337 while ((fd = open(console, O_RDONLY | O_NONBLOCK)) < 0) {
338 /* Can't open selected console -- try /dev/console */
339 if (!tried_devcons) {
340 tried_devcons++;
341 snprintf(console, sizeof(console) - 1, "%s", _PATH_CONSOLE);
342 continue;
343 }
344 /* Can't open selected console -- try vt1 */
345 if (!tried_vtprimary) {
346 tried_vtprimary++;
347 snprintf(console, sizeof(console) - 1, "%s", VT_PRIMARY);
348 continue;
349 }
350 break;
351 }
352 if (fd < 0) {
353 /* Perhaps we should panic here? */
354 snprintf(console, sizeof(console) - 1, "/dev/null");
Eric Andersen07e52971999-11-07 07:38:08 +0000355 } else {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000356 /* check for serial console and disable logging to tty3 & running a
357 * shell to tty2 */
358 if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000359 log = NULL;
360 secondConsole = NULL;
Erik Andersenfa4718e2000-02-21 19:25:12 +0000361 /* Force the TERM setting to vt102 for serial console --
362 * iff TERM is set to linux (the default) */
363 if (strcmp( termType, "TERM=linux" ) == 0)
364 snprintf(termType, sizeof(termType) - 1, "TERM=vt102");
Erik Andersene132f4b2000-02-09 04:16:43 +0000365 message(LOG | CONSOLE,
366 "serial console detected. Disabling virtual terminals.\r\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000367 }
368 close(fd);
Eric Andersen07e52971999-11-07 07:38:08 +0000369 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000370 message(LOG, "console=%s\n", console);
Eric Andersen0460ff21999-10-25 23:32:44 +0000371}
372
Erik Andersene49d5ec2000-02-08 19:58:47 +0000373static pid_t run(char *command, char *terminal, int get_enter)
Eric Andersen0460ff21999-10-25 23:32:44 +0000374{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000375 int i, fd;
376 pid_t pid;
377 char *tmpCmd;
378 char *cmd[255];
Erik Andersene132f4b2000-02-09 04:16:43 +0000379 char buf[255];
Erik Andersene49d5ec2000-02-08 19:58:47 +0000380 static const char press_enter[] =
381
382 "\nPlease press Enter to activate this console. ";
383 char *environment[] = {
384 "HOME=/",
385 "PATH=/usr/bin:/bin:/usr/sbin:/sbin",
386 "SHELL=/bin/sh",
387 termType,
388 "USER=root",
389 0
390 };
Erik Andersenac6e71f2000-01-08 22:04:33 +0000391
Eric Andersen0460ff21999-10-25 23:32:44 +0000392
Erik Andersene49d5ec2000-02-08 19:58:47 +0000393 if ((pid = fork()) == 0) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000394 /* Clean up */
395 close(0);
396 close(1);
397 close(2);
398 setsid();
Eric Andersen0460ff21999-10-25 23:32:44 +0000399
Erik Andersene49d5ec2000-02-08 19:58:47 +0000400 /* Reset signal handlers set for parent process */
401 signal(SIGUSR1, SIG_DFL);
402 signal(SIGUSR2, SIG_DFL);
403 signal(SIGINT, SIG_DFL);
404 signal(SIGTERM, SIG_DFL);
405 signal(SIGHUP, SIG_DFL);
Eric Andersen2f6c04f1999-11-01 23:59:44 +0000406
Erik Andersene49d5ec2000-02-08 19:58:47 +0000407 if ((fd = device_open(terminal, O_RDWR)) < 0) {
408 message(LOG | CONSOLE, "Bummer, can't open %s\r\n", terminal);
409 exit(1);
410 }
411 dup2(fd, 0);
412 dup2(fd, 1);
413 dup2(fd, 2);
Eric Andersenb02c54e2000-07-04 19:41:23 +0000414 ioctl(0, TIOCSCTTY, 0);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000415 tcsetpgrp(0, getpgrp());
416 set_term(0);
417
418 if (get_enter == TRUE) {
419 /*
420 * Save memory by not exec-ing anything large (like a shell)
421 * before the user wants it. This is critical if swap is not
422 * enabled and the system has low memory. Generally this will
423 * be run on the second virtual console, and the first will
424 * be allowed to start a shell or whatever an init script
425 * specifies.
426 */
427 char c;
Erik Andersene132f4b2000-02-09 04:16:43 +0000428#ifdef DEBUG_INIT
Erik Andersen2ac2fae2000-03-07 23:32:17 +0000429 pid_t shell_pgid = getpid();
Erik Andersene49d5ec2000-02-08 19:58:47 +0000430 message(LOG, "Waiting for enter to start '%s' (pid %d, console %s)\r\n",
431 command, shell_pgid, terminal);
Erik Andersene132f4b2000-02-09 04:16:43 +0000432#endif
Erik Andersene49d5ec2000-02-08 19:58:47 +0000433 write(fileno(stdout), press_enter, sizeof(press_enter) - 1);
434 read(fileno(stdin), &c, 1);
435 }
436
Erik Andersene49d5ec2000-02-08 19:58:47 +0000437#ifdef DEBUG_INIT
Erik Andersene132f4b2000-02-09 04:16:43 +0000438 /* Log the process name and args */
439 message(LOG, "Starting pid %d, console %s: '%s'\r\n",
440 shell_pgid, terminal, command);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000441#endif
Erik Andersene132f4b2000-02-09 04:16:43 +0000442
443 /* See if any special /bin/sh requiring characters are present */
444 if (strpbrk(command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
445 cmd[0] = SHELL;
446 cmd[1] = "-c";
447 strcpy(buf, "exec ");
448 strncat(buf, command, sizeof(buf) - strlen(buf) - 1);
449 cmd[2] = buf;
450 cmd[3] = NULL;
451 } else {
452 /* Convert command (char*) into cmd (char**, one word per string) */
453 for (tmpCmd = command, i = 0;
454 (tmpCmd = strsep(&command, " \t")) != NULL;) {
455 if (*tmpCmd != '\0') {
456 cmd[i] = tmpCmd;
457 tmpCmd++;
458 i++;
459 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000460 }
Erik Andersene132f4b2000-02-09 04:16:43 +0000461 cmd[i] = NULL;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000462 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000463
Erik Andersen183da4a2000-04-04 18:36:37 +0000464#if defined BB_FEATURE_INIT_COREDUMPS
Erik Andersen983b51b2000-04-04 18:14:25 +0000465 {
466 struct stat sb;
467 if (stat (CORE_ENABLE_FLAG_FILE, &sb) == 0) {
468 struct rlimit limit;
469 limit.rlim_cur = RLIM_INFINITY;
470 limit.rlim_max = RLIM_INFINITY;
471 setrlimit(RLIMIT_CORE, &limit);
472 }
473 }
Erik Andersen183da4a2000-04-04 18:36:37 +0000474#endif
Erik Andersen983b51b2000-04-04 18:14:25 +0000475
Erik Andersene49d5ec2000-02-08 19:58:47 +0000476 /* Now run it. The new program will take over this PID,
477 * so nothing further in init.c should be run. */
478 execve(cmd[0], cmd, environment);
479
480 /* We're still here? Some error happened. */
481 message(LOG | CONSOLE, "Bummer, could not run '%s': %s\n", cmd[0],
482 strerror(errno));
483 exit(-1);
Erik Andersen05df2392000-01-13 04:43:48 +0000484 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000485 return pid;
Eric Andersen0460ff21999-10-25 23:32:44 +0000486}
487
Erik Andersene49d5ec2000-02-08 19:58:47 +0000488static int waitfor(char *command, char *terminal, int get_enter)
Erik Andersen0e3782f2000-01-07 02:54:55 +0000489{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000490 int status, wpid;
491 int pid = run(command, terminal, get_enter);
Erik Andersen0e3782f2000-01-07 02:54:55 +0000492
Erik Andersene49d5ec2000-02-08 19:58:47 +0000493 while (1) {
494 wpid = wait(&status);
Erik Andersene132f4b2000-02-09 04:16:43 +0000495 if (wpid > 0 && wpid != pid) {
496 continue;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000497 }
498 if (wpid == pid)
499 break;
Erik Andersen0e3782f2000-01-07 02:54:55 +0000500 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000501 return wpid;
Erik Andersen0e3782f2000-01-07 02:54:55 +0000502}
503
Eric Andersen219d6f51999-11-02 19:43:01 +0000504/* Make sure there is enough memory to do something useful. *
Erik Andersene132f4b2000-02-09 04:16:43 +0000505 * Calls "swapon -a" if needed so be sure /etc/fstab is present... */
Eric Andersen219d6f51999-11-02 19:43:01 +0000506static void check_memory()
507{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000508 struct stat statBuf;
Eric Andersen219d6f51999-11-02 19:43:01 +0000509
Erik Andersend07ee462000-02-21 21:26:32 +0000510 if (check_free_memory() > 1000)
Erik Andersene49d5ec2000-02-08 19:58:47 +0000511 return;
512
513 if (stat("/etc/fstab", &statBuf) == 0) {
Erik Andersen61677fe2000-04-13 01:18:56 +0000514 /* swapon -a requires /proc typically */
515 waitfor("mount proc /proc -t proc", console, FALSE);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000516 /* Try to turn on swap */
Erik Andersen61677fe2000-04-13 01:18:56 +0000517 waitfor("swapon -a", console, FALSE);
Erik Andersend07ee462000-02-21 21:26:32 +0000518 if (check_free_memory() < 1000)
Erik Andersene49d5ec2000-02-08 19:58:47 +0000519 goto goodnight;
520 } else
521 goto goodnight;
Eric Andersen219d6f51999-11-02 19:43:01 +0000522 return;
523
Erik Andersene49d5ec2000-02-08 19:58:47 +0000524 goodnight:
525 message(CONSOLE,
526 "Sorry, your computer does not have enough memory.\r\n");
527 while (1)
528 sleep(1);
Eric Andersen219d6f51999-11-02 19:43:01 +0000529}
530
Erik Andersene132f4b2000-02-09 04:16:43 +0000531/* Run all commands to be run right before halt/reboot */
532static void run_lastAction(void)
533{
534 initAction *a;
535 for (a = initActionList; a; a = a->nextPtr) {
536 if (a->action == CTRLALTDEL) {
537 waitfor(a->process, a->console, FALSE);
538 delete_initAction(a);
539 }
540 }
541}
542
543
Erik Andersen7dc16072000-01-04 01:10:25 +0000544#ifndef DEBUG_INIT
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000545static void shutdown_system(void)
Eric Andersencc8ed391999-10-05 16:24:54 +0000546{
Erik Andersene132f4b2000-02-09 04:16:43 +0000547
Erik Andersene49d5ec2000-02-08 19:58:47 +0000548 /* first disable our SIGHUP signal */
549 signal(SIGHUP, SIG_DFL);
Erik Andersen7dc16072000-01-04 01:10:25 +0000550
Erik Andersene49d5ec2000-02-08 19:58:47 +0000551 /* Allow Ctrl-Alt-Del to reboot system. */
Erik Andersen4f3f7572000-04-28 00:18:56 +0000552 init_reboot(RB_ENABLE_CAD);
Erik Andersene132f4b2000-02-09 04:16:43 +0000553
554 message(CONSOLE|LOG, "\r\nThe system is going down NOW !!\r\n");
Eric Andersencf8c9cf1999-11-05 00:31:46 +0000555 sync();
Erik Andersene49d5ec2000-02-08 19:58:47 +0000556
557 /* Send signals to every process _except_ pid 1 */
Erik Andersene132f4b2000-02-09 04:16:43 +0000558 message(CONSOLE|LOG, "Sending SIGTERM to all processes.\r\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000559 kill(-1, SIGTERM);
Erik Andersene132f4b2000-02-09 04:16:43 +0000560 sleep(1);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000561 sync();
562
Erik Andersene132f4b2000-02-09 04:16:43 +0000563 message(CONSOLE|LOG, "Sending SIGKILL to all processes.\r\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000564 kill(-1, SIGKILL);
Erik Andersene132f4b2000-02-09 04:16:43 +0000565 sleep(1);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000566
Erik Andersene132f4b2000-02-09 04:16:43 +0000567 /* run everything to be run at "ctrlaltdel" */
568 run_lastAction();
569
Erik Andersene49d5ec2000-02-08 19:58:47 +0000570 sync();
571 if (kernelVersion > 0 && kernelVersion <= 2 * 65536 + 2 * 256 + 11) {
572 /* bdflush, kupdate not needed for kernels >2.2.11 */
573 bdflush(1, 0);
574 sync();
575 }
Eric Andersencc8ed391999-10-05 16:24:54 +0000576}
577
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000578static void halt_signal(int sig)
Eric Andersencc8ed391999-10-05 16:24:54 +0000579{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000580 shutdown_system();
Erik Andersene132f4b2000-02-09 04:16:43 +0000581 message(CONSOLE|LOG,
Erik Andersene49d5ec2000-02-08 19:58:47 +0000582 "The system is halted. Press %s or turn off power\r\n",
583 (secondConsole == NULL) /* serial console */
584 ? "Reset" : "CTRL-ALT-DEL");
585 sync();
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000586
Erik Andersene49d5ec2000-02-08 19:58:47 +0000587 /* allow time for last message to reach serial console */
Erik Andersene132f4b2000-02-09 04:16:43 +0000588 sleep(2);
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000589
Erik Andersen4d1d0111999-12-17 18:44:15 +0000590#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
Erik Andersene49d5ec2000-02-08 19:58:47 +0000591 if (sig == SIGUSR2)
Erik Andersen4f3f7572000-04-28 00:18:56 +0000592 init_reboot(RB_POWER_OFF);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000593 else
Erik Andersen4d1d0111999-12-17 18:44:15 +0000594#endif
Erik Andersen4f3f7572000-04-28 00:18:56 +0000595 init_reboot(RB_HALT_SYSTEM);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000596 exit(0);
Eric Andersencc8ed391999-10-05 16:24:54 +0000597}
598
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000599static void reboot_signal(int sig)
Eric Andersencc8ed391999-10-05 16:24:54 +0000600{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000601 shutdown_system();
Erik Andersene132f4b2000-02-09 04:16:43 +0000602 message(CONSOLE|LOG, "Please stand by while rebooting the system.\r\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000603 sync();
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000604
Erik Andersene49d5ec2000-02-08 19:58:47 +0000605 /* allow time for last message to reach serial console */
606 sleep(2);
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000607
Erik Andersen4f3f7572000-04-28 00:18:56 +0000608 init_reboot(RB_AUTOBOOT);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000609 exit(0);
Eric Andersencc8ed391999-10-05 16:24:54 +0000610}
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000611
Erik Andersende552872000-01-23 01:34:05 +0000612#if defined BB_FEATURE_INIT_CHROOT
Erik Andersend07ee462000-02-21 21:26:32 +0000613
614#if ! defined BB_FEATURE_USE_PROCFS
615#error Sorry, I depend on the /proc filesystem right now.
616#endif
617
Erik Andersende552872000-01-23 01:34:05 +0000618static void check_chroot(int sig)
619{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000620 char *argv_init[2] = { "init", NULL, };
621 char *envp_init[3] = { "HOME=/", "TERM=linux", NULL, };
622 char rootpath[256], *tc;
623 int fd;
Erik Andersende552872000-01-23 01:34:05 +0000624
Erik Andersene49d5ec2000-02-08 19:58:47 +0000625 if ((fd = open("/proc/sys/kernel/init-chroot", O_RDONLY)) == -1) {
626 message(CONSOLE,
627 "SIGHUP recived, but could not open proc file\r\n");
628 sleep(2);
629 return;
630 }
631 if (read(fd, rootpath, sizeof(rootpath)) == -1) {
632 message(CONSOLE,
633 "SIGHUP recived, but could not read proc file\r\n");
634 sleep(2);
635 return;
636 }
637 close(fd);
638
639 if (rootpath[0] == '\0') {
640 message(CONSOLE,
641 "SIGHUP recived, but new root is not valid: %s\r\n",
642 rootpath);
643 sleep(2);
644 return;
645 }
646
647 tc = strrchr(rootpath, '\n');
648 *tc = '\0';
649
650 /* Ok, making it this far means we commit */
651 message(CONSOLE, "Please stand by, changing root to `%s'.\r\n",
652 rootpath);
653
654 /* kill all other programs first */
655 message(CONSOLE, "Sending SIGTERM to all processes.\r\n");
656 kill(-1, SIGTERM);
Erik Andersende552872000-01-23 01:34:05 +0000657 sleep(2);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000658 sync();
659
660 message(CONSOLE, "Sending SIGKILL to all processes.\r\n");
661 kill(-1, SIGKILL);
Erik Andersende552872000-01-23 01:34:05 +0000662 sleep(2);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000663 sync();
664
665 /* ok, we don't need /proc anymore. we also assume that the signaling
666 * process left the rest of the filesystems alone for us */
667 umount("/proc");
668
669 /* Ok, now we chroot. Hopefully we only have two things mounted, the
670 * new chroot'd mount point, and the old "/" mount. s,
671 * we go ahead and unmount the old "/". This should trigger the kernel
672 * to set things up the Right Way(tm). */
673
674 if (!chroot(rootpath))
675 umount("/dev/root");
676
677 /* If the chroot fails, we are already too far to turn back, so we
678 * continue and hope that executing init below will revive the system */
679
680 /* close all of our descriptors and open new ones */
681 close(0);
682 close(1);
683 close(2);
684 open("/dev/console", O_RDWR, 0);
685 dup(0);
686 dup(0);
687
688 message(CONSOLE, "Executing real init...\r\n");
689 /* execute init in the (hopefully) new root */
690 execve("/sbin/init", argv_init, envp_init);
691
692 message(CONSOLE,
693 "ERROR: Could not exec new init. Press %s to reboot.\r\n",
694 (secondConsole == NULL) /* serial console */
695 ? "Reset" : "CTRL-ALT-DEL");
Erik Andersende552872000-01-23 01:34:05 +0000696 return;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000697}
698#endif /* BB_FEATURE_INIT_CHROOT */
Erik Andersende552872000-01-23 01:34:05 +0000699
Erik Andersene49d5ec2000-02-08 19:58:47 +0000700#endif /* ! DEBUG_INIT */
Erik Andersende552872000-01-23 01:34:05 +0000701
Erik Andersene49d5ec2000-02-08 19:58:47 +0000702void new_initAction(initActionEnum action, char *process, char *cons)
Erik Andersen7dc16072000-01-04 01:10:25 +0000703{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000704 initAction *newAction;
Erik Andersen9e737252000-01-06 01:16:13 +0000705
Erik Andersene49d5ec2000-02-08 19:58:47 +0000706 if (*cons == '\0')
707 cons = console;
Erik Andersen9e737252000-01-06 01:16:13 +0000708
Erik Andersene49d5ec2000-02-08 19:58:47 +0000709 /* If BusyBox detects that a serial console is in use,
710 * then entries not refering to the console or null devices will _not_ be run.
711 * The exception to this rule is the null device.
712 */
713 if (secondConsole == NULL && strcmp(cons, console)
714 && strcmp(cons, "/dev/null"))
715 return;
716
717 newAction = calloc((size_t) (1), sizeof(initAction));
718 if (!newAction) {
719 message(LOG | CONSOLE, "Memory allocation failure\n");
720 while (1)
721 sleep(1);
722 }
723 newAction->nextPtr = initActionList;
724 initActionList = newAction;
725 strncpy(newAction->process, process, 255);
726 newAction->action = action;
727 strncpy(newAction->console, cons, 255);
728 newAction->pid = 0;
Erik Andersen31638212000-01-15 22:28:50 +0000729// message(LOG|CONSOLE, "process='%s' action='%d' console='%s'\n",
Erik Andersene49d5ec2000-02-08 19:58:47 +0000730// newAction->process, newAction->action, newAction->console);
Erik Andersen7dc16072000-01-04 01:10:25 +0000731}
732
Erik Andersene132f4b2000-02-09 04:16:43 +0000733static void delete_initAction(initAction * action)
Erik Andersen7dc16072000-01-04 01:10:25 +0000734{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000735 initAction *a, *b = NULL;
736
737 for (a = initActionList; a; b = a, a = a->nextPtr) {
738 if (a == action) {
739 if (b == NULL) {
740 initActionList = a->nextPtr;
741 } else {
742 b->nextPtr = a->nextPtr;
743 }
744 free(a);
745 break;
746 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000747 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000748}
749
Erik Andersen9e737252000-01-06 01:16:13 +0000750/* NOTE that if BB_FEATURE_USE_INITTAB is NOT defined,
751 * then parse_inittab() simply adds in some default
752 * actions(i.e runs INIT_SCRIPT and then starts a pair
Erik Andersen812d4662000-01-07 18:30:40 +0000753 * of "askfirst" shells). If BB_FEATURE_USE_INITTAB
754 * _is_ defined, but /etc/inittab is missing, this
755 * results in the same set of default behaviors.
Erik Andersen9e737252000-01-06 01:16:13 +0000756 * */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000757void parse_inittab(void)
Erik Andersen7dc16072000-01-04 01:10:25 +0000758{
Erik Andersen9e737252000-01-06 01:16:13 +0000759#ifdef BB_FEATURE_USE_INITTAB
Erik Andersene49d5ec2000-02-08 19:58:47 +0000760 FILE *file;
761 char buf[256], lineAsRead[256], tmpConsole[256];
Eric Andersenb5966362000-05-31 20:04:38 +0000762 char *id, *runlev, *action, *process, *eol;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000763 const struct initActionType *a = actions;
764 int foundIt;
Erik Andersen7dc16072000-01-04 01:10:25 +0000765
766
Erik Andersene49d5ec2000-02-08 19:58:47 +0000767 file = fopen(INITTAB, "r");
768 if (file == NULL) {
769 /* No inittab file -- set up some default behavior */
Erik Andersen9e737252000-01-06 01:16:13 +0000770#endif
Erik Andersene132f4b2000-02-09 04:16:43 +0000771 /* Swapoff on halt/reboot */
Erik Andersenfb1793f2000-02-09 16:37:08 +0000772 new_initAction(CTRLALTDEL, "/sbin/swapoff -a > /dev/null 2>&1", console);
Erik Andersene132f4b2000-02-09 04:16:43 +0000773 /* Umount all filesystems on halt/reboot */
774 new_initAction(CTRLALTDEL, "/bin/umount -a -r > /dev/null 2>&1", console);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000775 /* Askfirst shell on tty1 */
776 new_initAction(ASKFIRST, SHELL, console);
777 /* Askfirst shell on tty2 */
778 if (secondConsole != NULL)
779 new_initAction(ASKFIRST, SHELL, secondConsole);
780 /* sysinit */
781 new_initAction(SYSINIT, INIT_SCRIPT, console);
Erik Andersen7dc16072000-01-04 01:10:25 +0000782
Erik Andersene49d5ec2000-02-08 19:58:47 +0000783 return;
Erik Andersen9e737252000-01-06 01:16:13 +0000784#ifdef BB_FEATURE_USE_INITTAB
Erik Andersen9e737252000-01-06 01:16:13 +0000785 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000786
Erik Andersene49d5ec2000-02-08 19:58:47 +0000787 while (fgets(buf, 255, file) != NULL) {
788 foundIt = FALSE;
Eric Andersenb5966362000-05-31 20:04:38 +0000789 /* Skip leading spaces */
790 for (id = buf; *id == ' ' || *id == '\t'; id++);
791
792 /* Skip the line if it's a comment */
793 if (*id == '#' || *id == '\n')
Erik Andersene49d5ec2000-02-08 19:58:47 +0000794 continue;
Erik Andersen7dc16072000-01-04 01:10:25 +0000795
Erik Andersene49d5ec2000-02-08 19:58:47 +0000796 /* Trim the trailing \n */
Eric Andersenb5966362000-05-31 20:04:38 +0000797 eol = strrchr(id, '\n');
798 if (eol != NULL)
799 *eol = '\0';
Erik Andersen7dc16072000-01-04 01:10:25 +0000800
Erik Andersene49d5ec2000-02-08 19:58:47 +0000801 /* Keep a copy around for posterity's sake (and error msgs) */
802 strcpy(lineAsRead, buf);
803
Eric Andersenb5966362000-05-31 20:04:38 +0000804 /* Separate the ID field from the runlevels */
805 runlev = strchr(id, ':');
806 if (runlev == NULL || *(runlev + 1) == '\0') {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000807 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
808 continue;
809 } else {
Eric Andersenb5966362000-05-31 20:04:38 +0000810 *runlev = '\0';
811 ++runlev;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000812 }
813
Eric Andersenb5966362000-05-31 20:04:38 +0000814 /* Separate the runlevels from the action */
815 action = strchr(runlev, ':');
816 if (action == NULL || *(action + 1) == '\0') {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000817 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
818 continue;
819 } else {
Eric Andersenb5966362000-05-31 20:04:38 +0000820 *action = '\0';
821 ++action;
822 }
823
824 /* Separate the action from the process */
825 process = strchr(action, ':');
826 if (process == NULL || *(process + 1) == '\0') {
827 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
828 continue;
829 } else {
830 *process = '\0';
831 ++process;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000832 }
833
834 /* Ok, now process it */
835 a = actions;
836 while (a->name != 0) {
Eric Andersenb5966362000-05-31 20:04:38 +0000837 if (strcmp(a->name, action) == 0) {
838 if (*id != '\0') {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000839 struct stat statBuf;
840
841 strcpy(tmpConsole, "/dev/");
Eric Andersenb5966362000-05-31 20:04:38 +0000842 strncat(tmpConsole, id, 200);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000843 if (stat(tmpConsole, &statBuf) != 0) {
844 message(LOG | CONSOLE,
845 "device '%s' does not exist. Did you read the directions?\n",
846 tmpConsole);
847 break;
848 }
Eric Andersenb5966362000-05-31 20:04:38 +0000849 id = tmpConsole;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000850 }
Eric Andersenb5966362000-05-31 20:04:38 +0000851 new_initAction(a->action, process, id);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000852 foundIt = TRUE;
853 }
854 a++;
855 }
856 if (foundIt == TRUE)
857 continue;
858 else {
859 /* Choke on an unknown action */
860 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
861 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000862 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000863 return;
Erik Andersen42094cd2000-03-20 21:34:52 +0000864#endif /* BB_FEATURE_USE_INITTAB */
Erik Andersen7dc16072000-01-04 01:10:25 +0000865}
866
Erik Andersene132f4b2000-02-09 04:16:43 +0000867
868
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000869extern int init_main(int argc, char **argv)
Eric Andersen0460ff21999-10-25 23:32:44 +0000870{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000871 initAction *a;
872 pid_t wpid;
873 int status;
Eric Andersen0460ff21999-10-25 23:32:44 +0000874
Eric Andersend73dc5b1999-11-10 23:13:02 +0000875#ifndef DEBUG_INIT
Erik Andersena51ecdd2000-02-24 18:09:58 +0000876 /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
877 if (getpid() != 1
878#ifdef BB_FEATURE_LINUXRC
879 && strstr(argv[0], "linuxrc") == NULL
880#endif
881 )
882 {
883 usage("init\n\nInit is the parent of all processes.\n\n"
884 "This version of init is designed to be run only "
885 "by the kernel.\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000886 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000887 /* Set up sig handlers -- be sure to
888 * clear all of these in run() */
889 signal(SIGUSR1, halt_signal);
890 signal(SIGUSR2, reboot_signal);
891 signal(SIGINT, reboot_signal);
892 signal(SIGTERM, reboot_signal);
Erik Andersende552872000-01-23 01:34:05 +0000893#if defined BB_FEATURE_INIT_CHROOT
Erik Andersene49d5ec2000-02-08 19:58:47 +0000894 signal(SIGHUP, check_chroot);
Erik Andersende552872000-01-23 01:34:05 +0000895#endif
Eric Andersen0460ff21999-10-25 23:32:44 +0000896
Erik Andersene49d5ec2000-02-08 19:58:47 +0000897 /* Turn off rebooting via CTL-ALT-DEL -- we get a
898 * SIGINT on CAD so we can shut things down gracefully... */
Erik Andersen4f3f7572000-04-28 00:18:56 +0000899 init_reboot(RB_DISABLE_CAD);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000900#endif
Erik Andersen05df2392000-01-13 04:43:48 +0000901
Erik Andersen298854f2000-03-23 01:09:18 +0000902 /* Figure out what kernel this is running */
903 kernelVersion = get_kernel_revision();
904
Erik Andersene49d5ec2000-02-08 19:58:47 +0000905 /* Figure out where the default console should be */
906 console_init();
Eric Andersen0460ff21999-10-25 23:32:44 +0000907
Erik Andersene49d5ec2000-02-08 19:58:47 +0000908 /* Close whatever files are open, and reset the console. */
909 close(0);
910 close(1);
911 close(2);
912 set_term(0);
Erik Andersen983b51b2000-04-04 18:14:25 +0000913 chdir("/");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000914 setsid();
Eric Andersencc8ed391999-10-05 16:24:54 +0000915
Erik Andersene49d5ec2000-02-08 19:58:47 +0000916 /* Make sure PATH is set to something sane */
917 putenv(_PATH_STDPATH);
Eric Andersencc8ed391999-10-05 16:24:54 +0000918
Erik Andersene49d5ec2000-02-08 19:58:47 +0000919 /* Hello world */
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000920#ifndef DEBUG_INIT
Erik Andersenea6b67d2000-03-07 07:47:10 +0000921 message(
922#if ! defined BB_FEATURE_EXTRA_QUIET
923 CONSOLE|
924#endif
925 LOG,
Erik Andersene49d5ec2000-02-08 19:58:47 +0000926 "init started: BusyBox v%s (%s) multi-call binary\r\n",
927 BB_VER, BB_BT);
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000928#else
Erik Andersenea6b67d2000-03-07 07:47:10 +0000929 message(
930#if ! defined BB_FEATURE_EXTRA_QUIET
931 CONSOLE|
932#endif
933 LOG,
Erik Andersene49d5ec2000-02-08 19:58:47 +0000934 "init(%d) started: BusyBox v%s (%s) multi-call binary\r\n",
935 getpid(), BB_VER, BB_BT);
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000936#endif
Eric Andersencc8ed391999-10-05 16:24:54 +0000937
Eric Andersencc8ed391999-10-05 16:24:54 +0000938
Erik Andersene49d5ec2000-02-08 19:58:47 +0000939 /* Make sure there is enough memory to do something useful. */
940 check_memory();
Erik Andersen9e737252000-01-06 01:16:13 +0000941
Erik Andersene49d5ec2000-02-08 19:58:47 +0000942 /* Check if we are supposed to be in single user mode */
943 if (argc > 1 && (!strcmp(argv[1], "single") ||
944 !strcmp(argv[1], "-s") || !strcmp(argv[1], "1"))) {
945 /* Ask first then start a shell on tty2 */
946 if (secondConsole != NULL)
947 new_initAction(ASKFIRST, SHELL, secondConsole);
948 /* Start a shell on tty1 */
949 new_initAction(RESPAWN, SHELL, console);
950 } else {
951 /* Not in single user mode -- see what inittab says */
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000952
Erik Andersene49d5ec2000-02-08 19:58:47 +0000953 /* NOTE that if BB_FEATURE_USE_INITTAB is NOT defined,
954 * then parse_inittab() simply adds in some default
955 * actions(i.e runs INIT_SCRIPT and then starts a pair
956 * of "askfirst" shells */
957 parse_inittab();
Eric Andersend00c2621999-12-07 08:37:31 +0000958 }
Erik Andersen983b51b2000-04-04 18:14:25 +0000959
Erik Andersene132f4b2000-02-09 04:16:43 +0000960 /* Fix up argv[0] to be certain we claim to be init */
961 strncpy(argv[0], "init", strlen(argv[0])+1);
Erik Andersen07f56042000-02-09 06:05:01 +0000962 if (argc > 1)
963 strncpy(argv[1], "\0", strlen(argv[1])+1);
Eric Andersen219d6f51999-11-02 19:43:01 +0000964
Erik Andersene49d5ec2000-02-08 19:58:47 +0000965 /* Now run everything that needs to be run */
966
967 /* First run the sysinit command */
968 for (a = initActionList; a; a = a->nextPtr) {
969 if (a->action == SYSINIT) {
970 waitfor(a->process, a->console, FALSE);
971 /* Now remove the "sysinit" entry from the list */
972 delete_initAction(a);
Erik Andersen7dc16072000-01-04 01:10:25 +0000973 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000974 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000975 /* Next run anything that wants to block */
976 for (a = initActionList; a; a = a->nextPtr) {
977 if (a->action == WAIT) {
978 waitfor(a->process, a->console, FALSE);
979 /* Now remove the "wait" entry from the list */
980 delete_initAction(a);
Erik Andersen7dc16072000-01-04 01:10:25 +0000981 }
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000982 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000983 /* Next run anything to be run only once */
984 for (a = initActionList; a; a = a->nextPtr) {
985 if (a->action == ONCE) {
986 run(a->process, a->console, FALSE);
987 /* Now remove the "once" entry from the list */
988 delete_initAction(a);
989 }
990 }
991 /* If there is nothing else to do, stop */
992 if (initActionList == NULL) {
993 message(LOG | CONSOLE,
994 "No more tasks for init -- sleeping forever.\n");
995 while (1)
996 sleep(1);
997 }
998
999 /* Now run the looping stuff for the rest of forever */
1000 while (1) {
1001 for (a = initActionList; a; a = a->nextPtr) {
1002 /* Only run stuff with pid==0. If they have
1003 * a pid, that means they are still running */
1004 if (a->pid == 0) {
1005 switch (a->action) {
1006 case RESPAWN:
1007 /* run the respawn stuff */
1008 a->pid = run(a->process, a->console, FALSE);
1009 break;
1010 case ASKFIRST:
1011 /* run the askfirst stuff */
1012 a->pid = run(a->process, a->console, TRUE);
1013 break;
1014 /* silence the compiler's incessant whining */
1015 default:
1016 break;
1017 }
1018 }
1019 }
1020 /* Wait for a child process to exit */
1021 wpid = wait(&status);
1022 if (wpid > 0) {
1023 /* Find out who died and clean up their corpse */
1024 for (a = initActionList; a; a = a->nextPtr) {
1025 if (a->pid == wpid) {
1026 a->pid = 0;
1027 message(LOG,
1028 "Process '%s' (pid %d) exited. Scheduling it for restart.\n",
1029 a->process, wpid);
1030 }
1031 }
1032 }
1033 sleep(1);
1034 }
Eric Andersencc8ed391999-10-05 16:24:54 +00001035}
Erik Andersen029011b2000-03-04 21:19:32 +00001036
1037/*
1038Local Variables:
1039c-file-style: "linux"
1040c-basic-offset: 4
1041tab-width: 4
1042End:
1043*/