blob: 417aadd23be4c88fd31635fcc05d64b88126d7be [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
Erik Andersen4f3f7572000-04-28 00:18:56 +000030#include <stdio.h>
31#include <stdlib.h>
Eric Andersencc8ed391999-10-05 16:24:54 +000032#include <errno.h>
Eric Andersenb186d981999-12-03 09:19:54 +000033#include <paths.h>
Erik Andersen42094cd2000-03-20 21:34:52 +000034#include <signal.h>
35#include <stdarg.h>
Eric Andersencc8ed391999-10-05 16:24:54 +000036#include <string.h>
Erik Andersen4f3f7572000-04-28 00:18:56 +000037#include <termios.h>
38#include <unistd.h>
Eric Andersened3ef502001-01-27 08:24:39 +000039#include <limits.h>
Erik Andersen42094cd2000-03-20 21:34:52 +000040#include <sys/fcntl.h>
41#include <sys/ioctl.h>
Eric Andersencc8ed391999-10-05 16:24:54 +000042#include <sys/mount.h>
Erik Andersen42094cd2000-03-20 21:34:52 +000043#include <sys/types.h>
Erik Andersen42094cd2000-03-20 21:34:52 +000044#include <sys/wait.h>
Eric Andersencbe31da2001-02-20 06:14:08 +000045#include "busybox.h"
46#define bb_need_full_version
47#define BB_DECLARE_EXTERN
48#include "messages.c"
Erik Andersen4f3f7572000-04-28 00:18:56 +000049#ifdef BB_SYSLOGD
50# include <sys/syslog.h>
51#endif
52
Pavel Roskin9c5fcc32000-07-17 23:45:12 +000053
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
Eric Andersen41492d62001-02-23 00:05:56 +000096#ifndef _PATH_STDPATH
Erik Andersen4f3f7572000-04-28 00:18:56 +000097#define _PATH_STDPATH "/usr/bin:/bin:/usr/sbin:/sbin"
Eric Andersen41492d62001-02-23 00:05:56 +000098#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
Eric Andersen41492d62001-02-23 00:05:56 +0000137#define MAXENV 16 /* Number of env. vars */
138//static const int MAXENV = 16; /* Number of env. vars */
Mark Whitley59ab0252001-01-23 22:30:04 +0000139static const int LOG = 0x1;
140static const int CONSOLE = 0x2;
Erik Andersen7dc16072000-01-04 01:10:25 +0000141
142/* Allowed init action types */
143typedef enum {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000144 SYSINIT = 1,
145 RESPAWN,
146 ASKFIRST,
147 WAIT,
Erik Andersene132f4b2000-02-09 04:16:43 +0000148 ONCE,
149 CTRLALTDEL
Erik Andersen7dc16072000-01-04 01:10:25 +0000150} initActionEnum;
151
Erik Andersen42094cd2000-03-20 21:34:52 +0000152/* A mapping between "inittab" action name strings and action type codes. */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000153typedef struct initActionType {
154 const char *name;
155 initActionEnum action;
Erik Andersen7dc16072000-01-04 01:10:25 +0000156} initActionType;
157
158static const struct initActionType actions[] = {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000159 {"sysinit", SYSINIT},
160 {"respawn", RESPAWN},
161 {"askfirst", ASKFIRST},
162 {"wait", WAIT},
163 {"once", ONCE},
Erik Andersene132f4b2000-02-09 04:16:43 +0000164 {"ctrlaltdel", CTRLALTDEL},
Pavel Roskin9027bcf2000-07-14 15:44:25 +0000165 {0, 0}
Erik Andersen7dc16072000-01-04 01:10:25 +0000166};
167
Erik Andersen42094cd2000-03-20 21:34:52 +0000168/* Set up a linked list of initActions, to be read from inittab */
Erik Andersen7dc16072000-01-04 01:10:25 +0000169typedef struct initActionTag initAction;
170struct initActionTag {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000171 pid_t pid;
172 char process[256];
173 char console[256];
174 initAction *nextPtr;
175 initActionEnum action;
Erik Andersen7dc16072000-01-04 01:10:25 +0000176};
Eric Andersen3e6ff902001-03-09 21:24:12 +0000177static initAction *initActionList = NULL;
Erik Andersen7dc16072000-01-04 01:10:25 +0000178
179
Erik Andersenac6e71f2000-01-08 22:04:33 +0000180static char *secondConsole = VT_SECONDARY;
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000181static char *thirdConsole = VT_THIRD;
182static char *fourthConsole = VT_FOURTH;
Erik Andersen42094cd2000-03-20 21:34:52 +0000183static char *log = VT_LOG;
184static int kernelVersion = 0;
185static char termType[32] = "TERM=linux";
186static char console[32] = _PATH_CONSOLE;
187
Erik Andersene132f4b2000-02-09 04:16:43 +0000188static void delete_initAction(initAction * action);
Eric Andersen0460ff21999-10-25 23:32:44 +0000189
190
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000191
Erik Andersen42094cd2000-03-20 21:34:52 +0000192/* Print a message to the specified device.
193 * Device may be bitwise-or'd from LOG | CONSOLE */
194static void message(int device, char *fmt, ...)
Erik Andersen93d65132000-04-06 08:06:36 +0000195 __attribute__ ((format (printf, 2, 3)));
196static void message(int device, char *fmt, ...)
Eric Andersen0460ff21999-10-25 23:32:44 +0000197{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000198 va_list arguments;
199 int fd;
Erik Andersen7dc16072000-01-04 01:10:25 +0000200
Eric Andersen4c781471999-11-26 08:12:56 +0000201#ifdef BB_SYSLOGD
202
Erik Andersene49d5ec2000-02-08 19:58:47 +0000203 /* Log the message to syslogd */
204 if (device & LOG) {
205 char msg[1024];
Eric Andersen4c781471999-11-26 08:12:56 +0000206
Erik Andersene49d5ec2000-02-08 19:58:47 +0000207 va_start(arguments, fmt);
208 vsnprintf(msg, sizeof(msg), fmt, arguments);
209 va_end(arguments);
Eric Andersen53cfb7e2001-01-31 17:29:47 +0000210 openlog(applet_name, 0, LOG_USER);
Erik Andersene132f4b2000-02-09 04:16:43 +0000211 syslog(LOG_USER|LOG_INFO, msg);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000212 closelog();
Eric Andersen3ae0c781999-11-04 01:13:21 +0000213 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000214#else
215 static int log_fd = -1;
216
217 /* Take full control of the log tty, and never close it.
218 * It's mine, all mine! Muhahahaha! */
219 if (log_fd < 0) {
220 if (log == NULL) {
221 /* don't even try to log, because there is no such console */
222 log_fd = -2;
223 /* log to main console instead */
224 device = CONSOLE;
Erik Andersene132f4b2000-02-09 04:16:43 +0000225 } else if ((log_fd = device_open(log, O_RDWR|O_NDELAY)) < 0) {
226 log_fd = -2;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000227 fprintf(stderr, "Bummer, can't write to log on %s!\r\n", log);
Erik Andersene132f4b2000-02-09 04:16:43 +0000228 log = NULL;
229 device = CONSOLE;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000230 }
231 }
232 if ((device & LOG) && (log_fd >= 0)) {
233 va_start(arguments, fmt);
234 vdprintf(log_fd, fmt, arguments);
235 va_end(arguments);
236 }
Eric Andersen4c781471999-11-26 08:12:56 +0000237#endif
238
Erik Andersene49d5ec2000-02-08 19:58:47 +0000239 if (device & CONSOLE) {
240 /* Always send console messages to /dev/console so people will see them. */
241 if (
242 (fd =
243 device_open(_PATH_CONSOLE,
244 O_WRONLY | O_NOCTTY | O_NDELAY)) >= 0) {
245 va_start(arguments, fmt);
246 vdprintf(fd, fmt, arguments);
247 va_end(arguments);
248 close(fd);
249 } else {
250 fprintf(stderr, "Bummer, can't print: ");
251 va_start(arguments, fmt);
252 vfprintf(stderr, fmt, arguments);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000253 va_end(arguments);
254 }
Eric Andersen3ae0c781999-11-04 01:13:21 +0000255 }
Eric Andersencc8ed391999-10-05 16:24:54 +0000256}
257
Eric Andersen0460ff21999-10-25 23:32:44 +0000258/* Set terminal settings to reasonable defaults */
Eric Andersen3e6ff902001-03-09 21:24:12 +0000259static void set_term(int fd)
Eric Andersencc8ed391999-10-05 16:24:54 +0000260{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000261 struct termios tty;
Eric Andersencc8ed391999-10-05 16:24:54 +0000262
Erik Andersene49d5ec2000-02-08 19:58:47 +0000263 tcgetattr(fd, &tty);
Eric Andersencc8ed391999-10-05 16:24:54 +0000264
Erik Andersene49d5ec2000-02-08 19:58:47 +0000265 /* set control chars */
Eric Andersen3849f9b2000-07-10 19:56:47 +0000266 tty.c_cc[VINTR] = 3; /* C-c */
267 tty.c_cc[VQUIT] = 28; /* C-\ */
268 tty.c_cc[VERASE] = 127; /* C-? */
269 tty.c_cc[VKILL] = 21; /* C-u */
270 tty.c_cc[VEOF] = 4; /* C-d */
271 tty.c_cc[VSTART] = 17; /* C-q */
272 tty.c_cc[VSTOP] = 19; /* C-s */
273 tty.c_cc[VSUSP] = 26; /* C-z */
Eric Andersen02bc25b2000-07-06 21:29:32 +0000274
Erik Andersene49d5ec2000-02-08 19:58:47 +0000275 /* use line dicipline 0 */
276 tty.c_line = 0;
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000277
Erik Andersene49d5ec2000-02-08 19:58:47 +0000278 /* Make it be sane */
Erik Andersen6c41c442000-03-19 05:13:49 +0000279 tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD;
280 tty.c_cflag |= HUPCL|CLOCAL;
Eric Andersen08b10341999-11-19 02:38:58 +0000281
Erik Andersene49d5ec2000-02-08 19:58:47 +0000282 /* input modes */
283 tty.c_iflag = ICRNL | IXON | IXOFF;
Eric Andersen08b10341999-11-19 02:38:58 +0000284
Erik Andersene49d5ec2000-02-08 19:58:47 +0000285 /* output modes */
286 tty.c_oflag = OPOST | ONLCR;
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000287
Erik Andersene49d5ec2000-02-08 19:58:47 +0000288 /* local modes */
289 tty.c_lflag =
290 ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN;
Eric Andersencc8ed391999-10-05 16:24:54 +0000291
Erik Andersene49d5ec2000-02-08 19:58:47 +0000292 tcsetattr(fd, TCSANOW, &tty);
Eric Andersencc8ed391999-10-05 16:24:54 +0000293}
294
Eric Andersenbc5941a2000-12-06 23:17:37 +0000295/* How much memory does this machine have?
296 Units are kBytes to avoid overflow on 4GB machines */
Erik Andersend07ee462000-02-21 21:26:32 +0000297static int check_free_memory()
Eric Andersencc8ed391999-10-05 16:24:54 +0000298{
Erik Andersend07ee462000-02-21 21:26:32 +0000299 struct sysinfo info;
Eric Andersenbc5941a2000-12-06 23:17:37 +0000300 unsigned int result, u, s=10;
Eric Andersencc8ed391999-10-05 16:24:54 +0000301
Erik Andersend07ee462000-02-21 21:26:32 +0000302 if (sysinfo(&info) != 0) {
Eric Andersen53cfb7e2001-01-31 17:29:47 +0000303 perror_msg("Error checking free memory");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000304 return -1;
Eric Andersenabc7d591999-10-19 00:27:50 +0000305 }
Eric Andersenbc5941a2000-12-06 23:17:37 +0000306
307 /* Kernels 2.0.x and 2.2.x return info.mem_unit==0 with values in bytes.
308 * Kernels 2.4.0 return info.mem_unit in bytes. */
309 u = info.mem_unit;
310 if (u==0) u=1;
311 while ( (u&1) == 0 && s > 0 ) { u>>=1; s--; }
312 result = (info.totalram>>s) + (info.totalswap>>s);
313 result = result*u;
314 if (result < 0) result = INT_MAX;
315 return result;
Eric Andersencc8ed391999-10-05 16:24:54 +0000316}
317
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000318static void console_init()
Eric Andersen0460ff21999-10-25 23:32:44 +0000319{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000320 int fd;
321 int tried_devcons = 0;
322 int tried_vtprimary = 0;
Erik Andersen029011b2000-03-04 21:19:32 +0000323 struct vt_stat vt;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000324 struct serial_struct sr;
325 char *s;
Eric Andersen0460ff21999-10-25 23:32:44 +0000326
Erik Andersene49d5ec2000-02-08 19:58:47 +0000327 if ((s = getenv("TERM")) != NULL) {
328 snprintf(termType, sizeof(termType) - 1, "TERM=%s", s);
329 }
Erik Andersenac6e71f2000-01-08 22:04:33 +0000330
Erik Andersene49d5ec2000-02-08 19:58:47 +0000331 if ((s = getenv("CONSOLE")) != NULL) {
332 snprintf(console, sizeof(console) - 1, "%s", s);
333 }
Eric Andersenfbb39c81999-11-08 17:00:52 +0000334#if #cpu(sparc)
Erik Andersene49d5ec2000-02-08 19:58:47 +0000335 /* sparc kernel supports console=tty[ab] parameter which is also
336 * passed to init, so catch it here */
337 else if ((s = getenv("console")) != NULL) {
338 /* remap tty[ab] to /dev/ttyS[01] */
339 if (strcmp(s, "ttya") == 0)
340 snprintf(console, sizeof(console) - 1, "%s", SERIAL_CON0);
341 else if (strcmp(s, "ttyb") == 0)
342 snprintf(console, sizeof(console) - 1, "%s", SERIAL_CON1);
343 }
Eric Andersen219d6f51999-11-02 19:43:01 +0000344#endif
Erik Andersene49d5ec2000-02-08 19:58:47 +0000345 else {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000346 /* 2.2 kernels: identify the real console backend and try to use it */
347 if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
348 /* this is a serial console */
349 snprintf(console, sizeof(console) - 1, "/dev/ttyS%d", sr.line);
350 } else if (ioctl(0, VT_GETSTATE, &vt) == 0) {
351 /* this is linux virtual tty */
352 snprintf(console, sizeof(console) - 1, "/dev/tty%d",
353 vt.v_active);
354 } else {
355 snprintf(console, sizeof(console) - 1, "%s", _PATH_CONSOLE);
356 tried_devcons++;
357 }
Eric Andersen07e52971999-11-07 07:38:08 +0000358 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000359
360 while ((fd = open(console, O_RDONLY | O_NONBLOCK)) < 0) {
361 /* Can't open selected console -- try /dev/console */
362 if (!tried_devcons) {
363 tried_devcons++;
364 snprintf(console, sizeof(console) - 1, "%s", _PATH_CONSOLE);
365 continue;
366 }
367 /* Can't open selected console -- try vt1 */
368 if (!tried_vtprimary) {
369 tried_vtprimary++;
370 snprintf(console, sizeof(console) - 1, "%s", VT_PRIMARY);
371 continue;
372 }
373 break;
374 }
375 if (fd < 0) {
376 /* Perhaps we should panic here? */
377 snprintf(console, sizeof(console) - 1, "/dev/null");
Eric Andersen07e52971999-11-07 07:38:08 +0000378 } else {
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000379 /* check for serial console and disable logging to tty5 & running a
380 * shell to tty2-4 */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000381 if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000382 log = NULL;
383 secondConsole = NULL;
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000384 thirdConsole = NULL;
385 fourthConsole = NULL;
Erik Andersenfa4718e2000-02-21 19:25:12 +0000386 /* Force the TERM setting to vt102 for serial console --
387 * iff TERM is set to linux (the default) */
388 if (strcmp( termType, "TERM=linux" ) == 0)
389 snprintf(termType, sizeof(termType) - 1, "TERM=vt102");
Erik Andersene132f4b2000-02-09 04:16:43 +0000390 message(LOG | CONSOLE,
391 "serial console detected. Disabling virtual terminals.\r\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000392 }
393 close(fd);
Eric Andersen07e52971999-11-07 07:38:08 +0000394 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000395 message(LOG, "console=%s\n", console);
Eric Andersen0460ff21999-10-25 23:32:44 +0000396}
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000397
398static void fixup_argv(int argc, char **argv, char *new_argv0)
399{
400 int len;
401 /* Fix up argv[0] to be certain we claim to be init */
402 len = strlen(argv[0]);
403 memset(argv[0], 0, len);
404 strncpy(argv[0], new_argv0, len);
405
406 /* Wipe argv[1]-argv[N] so they don't clutter the ps listing */
407 len = 1;
408 while (argc > len) {
409 memset(argv[len], 0, strlen(argv[len]));
410 len++;
411 }
412}
413
Eric Andersen0460ff21999-10-25 23:32:44 +0000414
Erik Andersene49d5ec2000-02-08 19:58:47 +0000415static pid_t run(char *command, char *terminal, int get_enter)
Eric Andersen0460ff21999-10-25 23:32:44 +0000416{
Eric Andersen7f197852001-03-16 01:14:04 +0000417 int i, j;
Eric Andersen477aedd2001-02-20 18:01:50 +0000418 int fd;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000419 pid_t pid;
Eric Andersen7f197852001-03-16 01:14:04 +0000420 char *tmpCmd, *s;
421 char *cmd[255], *cmdpath;
Erik Andersene132f4b2000-02-09 04:16:43 +0000422 char buf[255];
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000423 struct stat sb;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000424 static const char press_enter[] =
425
Eric Andersen38624232001-01-25 00:04:16 +0000426#ifdef CUSTOMIZED_BANNER
427#include CUSTOMIZED_BANNER
428#endif
429
Erik Andersene49d5ec2000-02-08 19:58:47 +0000430 "\nPlease press Enter to activate this console. ";
Eric Andersen477aedd2001-02-20 18:01:50 +0000431 char *environment[MAXENV+1] = {
Eric Andersen7f197852001-03-16 01:14:04 +0000432 termType,
Erik Andersene49d5ec2000-02-08 19:58:47 +0000433 "HOME=/",
434 "PATH=/usr/bin:/bin:/usr/sbin:/sbin",
435 "SHELL=/bin/sh",
Eric Andersen7f197852001-03-16 01:14:04 +0000436 "USER=root",
437 NULL
Erik Andersene49d5ec2000-02-08 19:58:47 +0000438 };
Erik Andersenac6e71f2000-01-08 22:04:33 +0000439
Eric Andersen7f197852001-03-16 01:14:04 +0000440 /* inherit environment to the child, merging our values -andy */
441 for (i=0; environ[i]; i++) {
442 for (j=0; environment[j]; j++) {
443 s = strchr(environment[j], '=');
444 if (!strncmp(environ[i], environment[j], s - environment[j]))
445 break;
446 }
447 if (!environment[j]) {
448 environment[j++] = environ[i];
449 environment[j] = NULL;
450 }
Eric Andersen477aedd2001-02-20 18:01:50 +0000451 }
452
Erik Andersene49d5ec2000-02-08 19:58:47 +0000453 if ((pid = fork()) == 0) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000454 /* Clean up */
Eric Andersenfb6a5082000-09-13 16:15:29 +0000455 ioctl(0, TIOCNOTTY, 0);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000456 close(0);
457 close(1);
458 close(2);
459 setsid();
Eric Andersen0460ff21999-10-25 23:32:44 +0000460
Erik Andersene49d5ec2000-02-08 19:58:47 +0000461 /* Reset signal handlers set for parent process */
462 signal(SIGUSR1, SIG_DFL);
463 signal(SIGUSR2, SIG_DFL);
464 signal(SIGINT, SIG_DFL);
465 signal(SIGTERM, SIG_DFL);
466 signal(SIGHUP, SIG_DFL);
Eric Andersen2f6c04f1999-11-01 23:59:44 +0000467
Erik Andersene49d5ec2000-02-08 19:58:47 +0000468 if ((fd = device_open(terminal, O_RDWR)) < 0) {
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000469 if (stat(terminal, &sb) != 0) {
Eric Andersen53f50612001-03-14 09:01:11 +0000470 message(LOG | CONSOLE, "device '%s' does not exist.\n",
471 terminal);
472 exit(1);
473 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000474 message(LOG | CONSOLE, "Bummer, can't open %s\r\n", terminal);
475 exit(1);
476 }
477 dup2(fd, 0);
478 dup2(fd, 1);
479 dup2(fd, 2);
Eric Andersenfb6a5082000-09-13 16:15:29 +0000480 ioctl(0, TIOCSCTTY, 1);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000481 tcsetpgrp(0, getpgrp());
482 set_term(0);
483
Erik Andersene132f4b2000-02-09 04:16:43 +0000484 /* See if any special /bin/sh requiring characters are present */
485 if (strpbrk(command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
486 cmd[0] = SHELL;
487 cmd[1] = "-c";
488 strcpy(buf, "exec ");
489 strncat(buf, command, sizeof(buf) - strlen(buf) - 1);
490 cmd[2] = buf;
491 cmd[3] = NULL;
492 } else {
493 /* Convert command (char*) into cmd (char**, one word per string) */
494 for (tmpCmd = command, i = 0;
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000495 (tmpCmd = strsep(&command, " \t")) != NULL;) {
Erik Andersene132f4b2000-02-09 04:16:43 +0000496 if (*tmpCmd != '\0') {
497 cmd[i] = tmpCmd;
498 tmpCmd++;
499 i++;
500 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000501 }
Erik Andersene132f4b2000-02-09 04:16:43 +0000502 cmd[i] = NULL;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000503 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000504
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000505 cmdpath = cmd[0];
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000506
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000507 /*
508 Interactive shells want to see a dash in argv[0]. This
509 typically is handled by login, argv will be setup this
510 way if a dash appears at the front of the command path
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000511 (like "-/bin/sh").
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000512 */
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000513
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000514 if (*cmdpath == '-') {
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000515
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000516 /* skip over the dash */
517 ++cmdpath;
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000518
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000519 /* find the last component in the command pathname */
520 s = get_last_path_component(cmdpath);
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000521
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000522 /* make a new argv[0] */
523 if ((cmd[0] = malloc(strlen(s)+2)) == NULL) {
524 message(LOG | CONSOLE, "malloc failed");
525 cmd[0] = cmdpath;
526 } else {
527 cmd[0][0] = '-';
528 strcpy(cmd[0]+1, s);
529 }
530 }
531
532 if (get_enter == TRUE) {
533 /*
534 * Save memory by not exec-ing anything large (like a shell)
535 * before the user wants it. This is critical if swap is not
536 * enabled and the system has low memory. Generally this will
537 * be run on the second virtual console, and the first will
538 * be allowed to start a shell or whatever an init script
539 * specifies.
540 */
541#ifdef DEBUG_INIT
542 message(LOG, "Waiting for enter to start '%s' (pid %d, console %s)\r\n",
543 cmd[0], getpid(), terminal);
544#endif
545 write(fileno(stdout), press_enter, sizeof(press_enter) - 1);
546 getc(stdin);
547 }
548
549#ifdef DEBUG_INIT
550 /* Log the process name and args */
551 message(LOG, "Starting pid %d, console %s: '%s'\r\n",
552 getpid(), terminal, command);
553#endif
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000554
Erik Andersen183da4a2000-04-04 18:36:37 +0000555#if defined BB_FEATURE_INIT_COREDUMPS
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000556 if (stat (CORE_ENABLE_FLAG_FILE, &sb) == 0) {
557 struct rlimit limit;
558 limit.rlim_cur = RLIM_INFINITY;
559 limit.rlim_max = RLIM_INFINITY;
560 setrlimit(RLIMIT_CORE, &limit);
Erik Andersen983b51b2000-04-04 18:14:25 +0000561 }
Erik Andersen183da4a2000-04-04 18:36:37 +0000562#endif
Erik Andersen983b51b2000-04-04 18:14:25 +0000563
Erik Andersene49d5ec2000-02-08 19:58:47 +0000564 /* Now run it. The new program will take over this PID,
565 * so nothing further in init.c should be run. */
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000566 execve(cmdpath, cmd, environment);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000567
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000568 /* We're still here? Some error happened. */
569 message(LOG | CONSOLE, "Bummer, could not run '%s': %s\n", cmdpath,
570 strerror(errno));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000571 exit(-1);
Erik Andersen05df2392000-01-13 04:43:48 +0000572 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000573 return pid;
Eric Andersen0460ff21999-10-25 23:32:44 +0000574}
575
Erik Andersene49d5ec2000-02-08 19:58:47 +0000576static int waitfor(char *command, char *terminal, int get_enter)
Erik Andersen0e3782f2000-01-07 02:54:55 +0000577{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000578 int status, wpid;
579 int pid = run(command, terminal, get_enter);
Erik Andersen0e3782f2000-01-07 02:54:55 +0000580
Erik Andersene49d5ec2000-02-08 19:58:47 +0000581 while (1) {
582 wpid = wait(&status);
Erik Andersene132f4b2000-02-09 04:16:43 +0000583 if (wpid > 0 && wpid != pid) {
584 continue;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000585 }
586 if (wpid == pid)
587 break;
Erik Andersen0e3782f2000-01-07 02:54:55 +0000588 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000589 return wpid;
Erik Andersen0e3782f2000-01-07 02:54:55 +0000590}
591
Eric Andersen219d6f51999-11-02 19:43:01 +0000592/* Make sure there is enough memory to do something useful. *
Erik Andersene132f4b2000-02-09 04:16:43 +0000593 * Calls "swapon -a" if needed so be sure /etc/fstab is present... */
Eric Andersen219d6f51999-11-02 19:43:01 +0000594static void check_memory()
595{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000596 struct stat statBuf;
Eric Andersen219d6f51999-11-02 19:43:01 +0000597
Erik Andersend07ee462000-02-21 21:26:32 +0000598 if (check_free_memory() > 1000)
Erik Andersene49d5ec2000-02-08 19:58:47 +0000599 return;
600
601 if (stat("/etc/fstab", &statBuf) == 0) {
Erik Andersen61677fe2000-04-13 01:18:56 +0000602 /* swapon -a requires /proc typically */
603 waitfor("mount proc /proc -t proc", console, FALSE);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000604 /* Try to turn on swap */
Erik Andersen61677fe2000-04-13 01:18:56 +0000605 waitfor("swapon -a", console, FALSE);
Erik Andersend07ee462000-02-21 21:26:32 +0000606 if (check_free_memory() < 1000)
Erik Andersene49d5ec2000-02-08 19:58:47 +0000607 goto goodnight;
608 } else
609 goto goodnight;
Eric Andersen219d6f51999-11-02 19:43:01 +0000610 return;
611
Erik Andersene49d5ec2000-02-08 19:58:47 +0000612 goodnight:
613 message(CONSOLE,
614 "Sorry, your computer does not have enough memory.\r\n");
615 while (1)
616 sleep(1);
Eric Andersen219d6f51999-11-02 19:43:01 +0000617}
618
Erik Andersene132f4b2000-02-09 04:16:43 +0000619/* Run all commands to be run right before halt/reboot */
620static void run_lastAction(void)
621{
Eric Andersen0d4e51d2001-03-15 19:18:21 +0000622 initAction *a, *tmp;
Eric Andersena4edd0e2001-03-15 21:04:18 +0000623 for (a = initActionList; a; a = tmp) {
624 tmp = a->nextPtr;
Erik Andersene132f4b2000-02-09 04:16:43 +0000625 if (a->action == CTRLALTDEL) {
626 waitfor(a->process, a->console, FALSE);
627 delete_initAction(a);
628 }
629 }
630}
631
632
Erik Andersen7dc16072000-01-04 01:10:25 +0000633#ifndef DEBUG_INIT
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000634static void shutdown_system(void)
Eric Andersencc8ed391999-10-05 16:24:54 +0000635{
Erik Andersene132f4b2000-02-09 04:16:43 +0000636
Erik Andersene49d5ec2000-02-08 19:58:47 +0000637 /* first disable our SIGHUP signal */
638 signal(SIGHUP, SIG_DFL);
Erik Andersen7dc16072000-01-04 01:10:25 +0000639
Erik Andersene49d5ec2000-02-08 19:58:47 +0000640 /* Allow Ctrl-Alt-Del to reboot system. */
Erik Andersen4f3f7572000-04-28 00:18:56 +0000641 init_reboot(RB_ENABLE_CAD);
Erik Andersene132f4b2000-02-09 04:16:43 +0000642
643 message(CONSOLE|LOG, "\r\nThe system is going down NOW !!\r\n");
Eric Andersencf8c9cf1999-11-05 00:31:46 +0000644 sync();
Erik Andersene49d5ec2000-02-08 19:58:47 +0000645
646 /* Send signals to every process _except_ pid 1 */
Erik Andersene132f4b2000-02-09 04:16:43 +0000647 message(CONSOLE|LOG, "Sending SIGTERM to all processes.\r\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000648 kill(-1, SIGTERM);
Erik Andersene132f4b2000-02-09 04:16:43 +0000649 sleep(1);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000650 sync();
651
Erik Andersene132f4b2000-02-09 04:16:43 +0000652 message(CONSOLE|LOG, "Sending SIGKILL to all processes.\r\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000653 kill(-1, SIGKILL);
Erik Andersene132f4b2000-02-09 04:16:43 +0000654 sleep(1);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000655
Erik Andersene132f4b2000-02-09 04:16:43 +0000656 /* run everything to be run at "ctrlaltdel" */
657 run_lastAction();
658
Erik Andersene49d5ec2000-02-08 19:58:47 +0000659 sync();
Eric Andersenbd22ed82000-07-08 18:55:24 +0000660 if (kernelVersion > 0 && kernelVersion <= KERNEL_VERSION(2,2,11)) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000661 /* bdflush, kupdate not needed for kernels >2.2.11 */
662 bdflush(1, 0);
663 sync();
664 }
Eric Andersencc8ed391999-10-05 16:24:54 +0000665}
666
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000667static void halt_signal(int sig)
Eric Andersencc8ed391999-10-05 16:24:54 +0000668{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000669 shutdown_system();
Erik Andersene132f4b2000-02-09 04:16:43 +0000670 message(CONSOLE|LOG,
Erik Andersene49d5ec2000-02-08 19:58:47 +0000671 "The system is halted. Press %s or turn off power\r\n",
672 (secondConsole == NULL) /* serial console */
673 ? "Reset" : "CTRL-ALT-DEL");
674 sync();
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000675
Erik Andersene49d5ec2000-02-08 19:58:47 +0000676 /* allow time for last message to reach serial console */
Erik Andersene132f4b2000-02-09 04:16:43 +0000677 sleep(2);
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000678
Eric Andersenbd22ed82000-07-08 18:55:24 +0000679 if (sig == SIGUSR2 && kernelVersion >= KERNEL_VERSION(2,2,0))
Erik Andersen4f3f7572000-04-28 00:18:56 +0000680 init_reboot(RB_POWER_OFF);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000681 else
Erik Andersen4f3f7572000-04-28 00:18:56 +0000682 init_reboot(RB_HALT_SYSTEM);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000683 exit(0);
Eric Andersencc8ed391999-10-05 16:24:54 +0000684}
685
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000686static void reboot_signal(int sig)
Eric Andersencc8ed391999-10-05 16:24:54 +0000687{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000688 shutdown_system();
Erik Andersene132f4b2000-02-09 04:16:43 +0000689 message(CONSOLE|LOG, "Please stand by while rebooting the system.\r\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000690 sync();
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000691
Erik Andersene49d5ec2000-02-08 19:58:47 +0000692 /* allow time for last message to reach serial console */
693 sleep(2);
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000694
Erik Andersen4f3f7572000-04-28 00:18:56 +0000695 init_reboot(RB_AUTOBOOT);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000696 exit(0);
Eric Andersencc8ed391999-10-05 16:24:54 +0000697}
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000698
Erik Andersene49d5ec2000-02-08 19:58:47 +0000699#endif /* ! DEBUG_INIT */
Erik Andersende552872000-01-23 01:34:05 +0000700
Eric Andersen3e6ff902001-03-09 21:24:12 +0000701static void new_initAction(initActionEnum action, char *process, char *cons)
Erik Andersen7dc16072000-01-04 01:10:25 +0000702{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000703 initAction *newAction;
Erik Andersen9e737252000-01-06 01:16:13 +0000704
Erik Andersene49d5ec2000-02-08 19:58:47 +0000705 if (*cons == '\0')
706 cons = console;
Erik Andersen9e737252000-01-06 01:16:13 +0000707
Erik Andersene49d5ec2000-02-08 19:58:47 +0000708 /* If BusyBox detects that a serial console is in use,
709 * then entries not refering to the console or null devices will _not_ be run.
710 * The exception to this rule is the null device.
711 */
712 if (secondConsole == NULL && strcmp(cons, console)
713 && strcmp(cons, "/dev/null"))
714 return;
715
716 newAction = calloc((size_t) (1), sizeof(initAction));
717 if (!newAction) {
718 message(LOG | CONSOLE, "Memory allocation failure\n");
719 while (1)
720 sleep(1);
721 }
722 newAction->nextPtr = initActionList;
723 initActionList = newAction;
724 strncpy(newAction->process, process, 255);
725 newAction->action = action;
726 strncpy(newAction->console, cons, 255);
727 newAction->pid = 0;
Erik Andersen31638212000-01-15 22:28:50 +0000728// message(LOG|CONSOLE, "process='%s' action='%d' console='%s'\n",
Erik Andersene49d5ec2000-02-08 19:58:47 +0000729// newAction->process, newAction->action, newAction->console);
Erik Andersen7dc16072000-01-04 01:10:25 +0000730}
731
Erik Andersene132f4b2000-02-09 04:16:43 +0000732static void delete_initAction(initAction * action)
Erik Andersen7dc16072000-01-04 01:10:25 +0000733{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000734 initAction *a, *b = NULL;
735
736 for (a = initActionList; a; b = a, a = a->nextPtr) {
737 if (a == action) {
738 if (b == NULL) {
739 initActionList = a->nextPtr;
740 } else {
741 b->nextPtr = a->nextPtr;
742 }
743 free(a);
744 break;
745 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000746 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000747}
748
Erik Andersen9e737252000-01-06 01:16:13 +0000749/* NOTE that if BB_FEATURE_USE_INITTAB is NOT defined,
750 * then parse_inittab() simply adds in some default
751 * actions(i.e runs INIT_SCRIPT and then starts a pair
Erik Andersen812d4662000-01-07 18:30:40 +0000752 * of "askfirst" shells). If BB_FEATURE_USE_INITTAB
753 * _is_ defined, but /etc/inittab is missing, this
754 * results in the same set of default behaviors.
Erik Andersen9e737252000-01-06 01:16:13 +0000755 * */
Eric Andersen3e6ff902001-03-09 21:24:12 +0000756static void parse_inittab(void)
Erik Andersen7dc16072000-01-04 01:10:25 +0000757{
Erik Andersen9e737252000-01-06 01:16:13 +0000758#ifdef BB_FEATURE_USE_INITTAB
Erik Andersene49d5ec2000-02-08 19:58:47 +0000759 FILE *file;
760 char buf[256], lineAsRead[256], tmpConsole[256];
Eric Andersenb5966362000-05-31 20:04:38 +0000761 char *id, *runlev, *action, *process, *eol;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000762 const struct initActionType *a = actions;
763 int foundIt;
Erik Andersen7dc16072000-01-04 01:10:25 +0000764
765
Erik Andersene49d5ec2000-02-08 19:58:47 +0000766 file = fopen(INITTAB, "r");
767 if (file == NULL) {
768 /* No inittab file -- set up some default behavior */
Erik Andersen9e737252000-01-06 01:16:13 +0000769#endif
Erik Andersene132f4b2000-02-09 04:16:43 +0000770 /* Swapoff on halt/reboot */
Pavel Roskin33bee332000-09-15 01:02:50 +0000771 new_initAction(CTRLALTDEL, "/sbin/swapoff -a", console);
Erik Andersene132f4b2000-02-09 04:16:43 +0000772 /* Umount all filesystems on halt/reboot */
Pavel Roskin33bee332000-09-15 01:02:50 +0000773 new_initAction(CTRLALTDEL, "/bin/umount -a -r", console);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000774 /* Askfirst shell on tty1 */
775 new_initAction(ASKFIRST, SHELL, console);
776 /* Askfirst shell on tty2 */
777 if (secondConsole != NULL)
778 new_initAction(ASKFIRST, SHELL, secondConsole);
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000779 /* Askfirst shell on tty3 */
780 if (thirdConsole != NULL)
781 new_initAction(ASKFIRST, SHELL, thirdConsole);
782 /* Askfirst shell on tty4 */
783 if (fourthConsole != NULL)
784 new_initAction(ASKFIRST, SHELL, fourthConsole);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000785 /* sysinit */
786 new_initAction(SYSINIT, INIT_SCRIPT, console);
Erik Andersen7dc16072000-01-04 01:10:25 +0000787
Erik Andersene49d5ec2000-02-08 19:58:47 +0000788 return;
Erik Andersen9e737252000-01-06 01:16:13 +0000789#ifdef BB_FEATURE_USE_INITTAB
Erik Andersen9e737252000-01-06 01:16:13 +0000790 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000791
Erik Andersene49d5ec2000-02-08 19:58:47 +0000792 while (fgets(buf, 255, file) != NULL) {
793 foundIt = FALSE;
Eric Andersenb5966362000-05-31 20:04:38 +0000794 /* Skip leading spaces */
795 for (id = buf; *id == ' ' || *id == '\t'; id++);
796
797 /* Skip the line if it's a comment */
798 if (*id == '#' || *id == '\n')
Erik Andersene49d5ec2000-02-08 19:58:47 +0000799 continue;
Erik Andersen7dc16072000-01-04 01:10:25 +0000800
Erik Andersene49d5ec2000-02-08 19:58:47 +0000801 /* Trim the trailing \n */
Eric Andersenb5966362000-05-31 20:04:38 +0000802 eol = strrchr(id, '\n');
803 if (eol != NULL)
804 *eol = '\0';
Erik Andersen7dc16072000-01-04 01:10:25 +0000805
Erik Andersene49d5ec2000-02-08 19:58:47 +0000806 /* Keep a copy around for posterity's sake (and error msgs) */
807 strcpy(lineAsRead, buf);
808
Eric Andersenb5966362000-05-31 20:04:38 +0000809 /* Separate the ID field from the runlevels */
810 runlev = strchr(id, ':');
811 if (runlev == NULL || *(runlev + 1) == '\0') {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000812 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
813 continue;
814 } else {
Eric Andersenb5966362000-05-31 20:04:38 +0000815 *runlev = '\0';
816 ++runlev;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000817 }
818
Eric Andersenb5966362000-05-31 20:04:38 +0000819 /* Separate the runlevels from the action */
820 action = strchr(runlev, ':');
821 if (action == NULL || *(action + 1) == '\0') {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000822 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
823 continue;
824 } else {
Eric Andersenb5966362000-05-31 20:04:38 +0000825 *action = '\0';
826 ++action;
827 }
828
829 /* Separate the action from the process */
830 process = strchr(action, ':');
831 if (process == NULL || *(process + 1) == '\0') {
832 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
833 continue;
834 } else {
835 *process = '\0';
836 ++process;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000837 }
838
839 /* Ok, now process it */
840 a = actions;
841 while (a->name != 0) {
Eric Andersenb5966362000-05-31 20:04:38 +0000842 if (strcmp(a->name, action) == 0) {
843 if (*id != '\0') {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000844 strcpy(tmpConsole, "/dev/");
Eric Andersenb5966362000-05-31 20:04:38 +0000845 strncat(tmpConsole, id, 200);
Eric Andersenb5966362000-05-31 20:04:38 +0000846 id = tmpConsole;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000847 }
Eric Andersenb5966362000-05-31 20:04:38 +0000848 new_initAction(a->action, process, id);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000849 foundIt = TRUE;
850 }
851 a++;
852 }
853 if (foundIt == TRUE)
854 continue;
855 else {
856 /* Choke on an unknown action */
857 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
858 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000859 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000860 return;
Erik Andersen42094cd2000-03-20 21:34:52 +0000861#endif /* BB_FEATURE_USE_INITTAB */
Erik Andersen7dc16072000-01-04 01:10:25 +0000862}
863
Erik Andersene132f4b2000-02-09 04:16:43 +0000864
865
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000866extern int init_main(int argc, char **argv)
Eric Andersen0460ff21999-10-25 23:32:44 +0000867{
Eric Andersen0d4e51d2001-03-15 19:18:21 +0000868 initAction *a, *tmp;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000869 pid_t wpid;
870 int status;
Eric Andersen0460ff21999-10-25 23:32:44 +0000871
Eric Andersend73dc5b1999-11-10 23:13:02 +0000872#ifndef DEBUG_INIT
Erik Andersena51ecdd2000-02-24 18:09:58 +0000873 /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
874 if (getpid() != 1
875#ifdef BB_FEATURE_LINUXRC
Matt Kraaie58771e2000-07-12 15:38:49 +0000876 && strstr(applet_name, "linuxrc") == NULL
Erik Andersena51ecdd2000-02-24 18:09:58 +0000877#endif
878 )
879 {
Eric Andersen67991cf2001-02-14 21:23:06 +0000880 show_usage();
Erik Andersene49d5ec2000-02-08 19:58:47 +0000881 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000882 /* Set up sig handlers -- be sure to
883 * clear all of these in run() */
884 signal(SIGUSR1, halt_signal);
Eric Andersen4c95a282000-07-07 19:30:28 +0000885 signal(SIGUSR2, halt_signal);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000886 signal(SIGINT, reboot_signal);
887 signal(SIGTERM, reboot_signal);
Eric Andersen0460ff21999-10-25 23:32:44 +0000888
Erik Andersene49d5ec2000-02-08 19:58:47 +0000889 /* Turn off rebooting via CTL-ALT-DEL -- we get a
890 * SIGINT on CAD so we can shut things down gracefully... */
Erik Andersen4f3f7572000-04-28 00:18:56 +0000891 init_reboot(RB_DISABLE_CAD);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000892#endif
Erik Andersen05df2392000-01-13 04:43:48 +0000893
Erik Andersen298854f2000-03-23 01:09:18 +0000894 /* Figure out what kernel this is running */
895 kernelVersion = get_kernel_revision();
896
Erik Andersene49d5ec2000-02-08 19:58:47 +0000897 /* Figure out where the default console should be */
898 console_init();
Eric Andersen0460ff21999-10-25 23:32:44 +0000899
Erik Andersene49d5ec2000-02-08 19:58:47 +0000900 /* Close whatever files are open, and reset the console. */
901 close(0);
902 close(1);
903 close(2);
904 set_term(0);
Erik Andersen983b51b2000-04-04 18:14:25 +0000905 chdir("/");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000906 setsid();
Eric Andersencc8ed391999-10-05 16:24:54 +0000907
Erik Andersene49d5ec2000-02-08 19:58:47 +0000908 /* Make sure PATH is set to something sane */
Eric Andersen452fd332001-03-04 06:47:33 +0000909 putenv("PATH="_PATH_STDPATH);
Eric Andersencc8ed391999-10-05 16:24:54 +0000910
Erik Andersene49d5ec2000-02-08 19:58:47 +0000911 /* Hello world */
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000912#ifndef DEBUG_INIT
Erik Andersenea6b67d2000-03-07 07:47:10 +0000913 message(
914#if ! defined BB_FEATURE_EXTRA_QUIET
915 CONSOLE|
916#endif
917 LOG,
Pavel Roskin9c5fcc32000-07-17 23:45:12 +0000918 "init started: %s\r\n", full_version);
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000919#else
Erik Andersenea6b67d2000-03-07 07:47:10 +0000920 message(
921#if ! defined BB_FEATURE_EXTRA_QUIET
922 CONSOLE|
923#endif
924 LOG,
Pavel Roskin9c5fcc32000-07-17 23:45:12 +0000925 "init(%d) started: %s\r\n", getpid(), full_version);
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000926#endif
Eric Andersencc8ed391999-10-05 16:24:54 +0000927
Eric Andersencc8ed391999-10-05 16:24:54 +0000928
Erik Andersene49d5ec2000-02-08 19:58:47 +0000929 /* Make sure there is enough memory to do something useful. */
930 check_memory();
Erik Andersen9e737252000-01-06 01:16:13 +0000931
Erik Andersene49d5ec2000-02-08 19:58:47 +0000932 /* Check if we are supposed to be in single user mode */
933 if (argc > 1 && (!strcmp(argv[1], "single") ||
934 !strcmp(argv[1], "-s") || !strcmp(argv[1], "1"))) {
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000935 /* Ask first then start a shell on tty2-4 */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000936 if (secondConsole != NULL)
937 new_initAction(ASKFIRST, SHELL, secondConsole);
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000938 if (thirdConsole != NULL)
939 new_initAction(ASKFIRST, SHELL, thirdConsole);
940 if (fourthConsole != NULL)
941 new_initAction(ASKFIRST, SHELL, fourthConsole);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000942 /* Start a shell on tty1 */
943 new_initAction(RESPAWN, SHELL, console);
944 } else {
945 /* Not in single user mode -- see what inittab says */
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000946
Erik Andersene49d5ec2000-02-08 19:58:47 +0000947 /* NOTE that if BB_FEATURE_USE_INITTAB is NOT defined,
948 * then parse_inittab() simply adds in some default
949 * actions(i.e runs INIT_SCRIPT and then starts a pair
950 * of "askfirst" shells */
951 parse_inittab();
Eric Andersend00c2621999-12-07 08:37:31 +0000952 }
Erik Andersen983b51b2000-04-04 18:14:25 +0000953
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000954 /* Make the command line just say "init" -- thats all, nothing else */
955 fixup_argv(argc, argv, "init");
Eric Andersen219d6f51999-11-02 19:43:01 +0000956
Erik Andersene49d5ec2000-02-08 19:58:47 +0000957 /* Now run everything that needs to be run */
958
959 /* First run the sysinit command */
Eric Andersena4edd0e2001-03-15 21:04:18 +0000960 for (a = initActionList; a; a = tmp) {
961 tmp = a->nextPtr;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000962 if (a->action == SYSINIT) {
963 waitfor(a->process, a->console, FALSE);
964 /* Now remove the "sysinit" entry from the list */
965 delete_initAction(a);
Erik Andersen7dc16072000-01-04 01:10:25 +0000966 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000967 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000968 /* Next run anything that wants to block */
Eric Andersena4edd0e2001-03-15 21:04:18 +0000969 for (a = initActionList; a; a = tmp) {
970 tmp = a->nextPtr;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000971 if (a->action == WAIT) {
972 waitfor(a->process, a->console, FALSE);
973 /* Now remove the "wait" entry from the list */
974 delete_initAction(a);
Erik Andersen7dc16072000-01-04 01:10:25 +0000975 }
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000976 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000977 /* Next run anything to be run only once */
Eric Andersena4edd0e2001-03-15 21:04:18 +0000978 for (a = initActionList; a; a = tmp) {
979 tmp = a->nextPtr;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000980 if (a->action == ONCE) {
981 run(a->process, a->console, FALSE);
982 /* Now remove the "once" entry from the list */
983 delete_initAction(a);
984 }
985 }
986 /* If there is nothing else to do, stop */
987 if (initActionList == NULL) {
988 message(LOG | CONSOLE,
989 "No more tasks for init -- sleeping forever.\n");
990 while (1)
991 sleep(1);
992 }
993
994 /* Now run the looping stuff for the rest of forever */
995 while (1) {
996 for (a = initActionList; a; a = a->nextPtr) {
997 /* Only run stuff with pid==0. If they have
998 * a pid, that means they are still running */
999 if (a->pid == 0) {
1000 switch (a->action) {
1001 case RESPAWN:
1002 /* run the respawn stuff */
1003 a->pid = run(a->process, a->console, FALSE);
1004 break;
1005 case ASKFIRST:
1006 /* run the askfirst stuff */
1007 a->pid = run(a->process, a->console, TRUE);
1008 break;
1009 /* silence the compiler's incessant whining */
1010 default:
1011 break;
1012 }
1013 }
1014 }
1015 /* Wait for a child process to exit */
1016 wpid = wait(&status);
1017 if (wpid > 0) {
1018 /* Find out who died and clean up their corpse */
1019 for (a = initActionList; a; a = a->nextPtr) {
1020 if (a->pid == wpid) {
1021 a->pid = 0;
1022 message(LOG,
1023 "Process '%s' (pid %d) exited. Scheduling it for restart.\n",
1024 a->process, wpid);
1025 }
1026 }
1027 }
1028 sleep(1);
1029 }
Eric Andersencc8ed391999-10-05 16:24:54 +00001030}
Erik Andersen029011b2000-03-04 21:19:32 +00001031
1032/*
1033Local Variables:
1034c-file-style: "linux"
1035c-basic-offset: 4
1036tab-width: 4
1037End:
1038*/