blob: f6108f1e8b34ac75780974b56796e158d7ee0981 [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"
Eric Andersenbdfd0d72001-10-24 05:00:29 +000046#ifdef CONFIG_SYSLOGD
Erik Andersen4f3f7572000-04-28 00:18:56 +000047# include <sys/syslog.h>
48#endif
49
Pavel Roskin9c5fcc32000-07-17 23:45:12 +000050
Eric Andersenbd22ed82000-07-08 18:55:24 +000051/* From <linux/vt.h> */
52struct vt_stat {
53 unsigned short v_active; /* active vt */
54 unsigned short v_signal; /* signal to send */
55 unsigned short v_state; /* vt bitmask */
56};
Mark Whitley59ab0252001-01-23 22:30:04 +000057static const int VT_GETSTATE = 0x5603; /* get global vt state info */
Eric Andersenbd22ed82000-07-08 18:55:24 +000058
59/* From <linux/serial.h> */
60struct serial_struct {
61 int type;
62 int line;
63 int port;
64 int irq;
65 int flags;
66 int xmit_fifo_size;
67 int custom_divisor;
68 int baud_base;
69 unsigned short close_delay;
70 char reserved_char[2];
71 int hub6;
72 unsigned short closing_wait; /* time to wait before closing */
73 unsigned short closing_wait2; /* no longer used... */
74 int reserved[4];
75};
76
77
Eric Andersen72f9a422001-10-28 05:12:20 +000078#if (__GNU_LIBRARY__ > 5) || defined(__dietlibc__)
79 #include <sys/reboot.h>
80 #define init_reboot(magic) reboot(magic)
81#else
82 #define init_reboot(magic) reboot(0xfee1dead, 672274793, magic)
83#endif
Erik Andersen4f3f7572000-04-28 00:18:56 +000084
85#ifndef RB_HALT_SYSTEM
Mark Whitley59ab0252001-01-23 22:30:04 +000086static const int RB_HALT_SYSTEM = 0xcdef0123;
87static const int RB_ENABLE_CAD = 0x89abcdef;
88static const int RB_DISABLE_CAD = 0;
Erik Andersen4f3f7572000-04-28 00:18:56 +000089#define RB_POWER_OFF 0x4321fedc
Mark Whitley59ab0252001-01-23 22:30:04 +000090static const int RB_AUTOBOOT = 0x01234567;
Eric Andersen2f2da902001-04-09 23:54:15 +000091#endif
Eric Andersenb6b519b2001-04-09 23:52:18 +000092
Eric Andersen41492d62001-02-23 00:05:56 +000093#ifndef _PATH_STDPATH
Erik Andersen4f3f7572000-04-28 00:18:56 +000094#define _PATH_STDPATH "/usr/bin:/bin:/usr/sbin:/sbin"
Eric Andersen41492d62001-02-23 00:05:56 +000095#endif
Eric Andersencc8ed391999-10-05 16:24:54 +000096
Erik Andersen983b51b2000-04-04 18:14:25 +000097
Eric Andersenbdfd0d72001-10-24 05:00:29 +000098#if defined CONFIG_FEATURE_INIT_COREDUMPS
Erik Andersen983b51b2000-04-04 18:14:25 +000099/*
Erik Andersen183da4a2000-04-04 18:36:37 +0000100 * When a file named CORE_ENABLE_FLAG_FILE exists, setrlimit is called
101 * before processes are spawned to set core file size as unlimited.
102 * This is for debugging only. Don't use this is production, unless
103 * you want core dumps lying about....
Erik Andersen983b51b2000-04-04 18:14:25 +0000104 */
105#define CORE_ENABLE_FLAG_FILE "/.init_enable_core"
106#include <sys/resource.h>
107#include <sys/time.h>
Erik Andersen183da4a2000-04-04 18:36:37 +0000108#endif
Erik Andersen983b51b2000-04-04 18:14:25 +0000109
Erik Andersen4d1d0111999-12-17 18:44:15 +0000110#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
Erik Andersen4d1d0111999-12-17 18:44:15 +0000111
Eric Andersenb6b519b2001-04-09 23:52:18 +0000112#if __GNU_LIBRARY__ > 5
113 #include <sys/kdaemon.h>
Erik Andersen4f3f7572000-04-28 00:18:56 +0000114#else
Eric Andersenb6b519b2001-04-09 23:52:18 +0000115 extern int bdflush (int func, long int data);
116#endif
Erik Andersen4f3f7572000-04-28 00:18:56 +0000117
Eric Andersen0ecb54a1999-12-05 23:24:55 +0000118
Matt Kraai7bd773c2001-06-12 20:55:02 +0000119#define SHELL "/bin/sh" /* Default shell */
120#define LOGIN_SHELL "-" SHELL /* Default login shell */
Erik Andersen42094cd2000-03-20 21:34:52 +0000121#define INITTAB "/etc/inittab" /* inittab file location */
Erik Andersen96e2abd2000-01-07 11:40:44 +0000122#ifndef INIT_SCRIPT
Erik Andersen42094cd2000-03-20 21:34:52 +0000123#define INIT_SCRIPT "/etc/init.d/rcS" /* Default sysinit script. */
Erik Andersen96e2abd2000-01-07 11:40:44 +0000124#endif
Erik Andersen9c88cac1999-12-30 09:25:17 +0000125
Eric Andersen41492d62001-02-23 00:05:56 +0000126#define MAXENV 16 /* Number of env. vars */
127//static const int MAXENV = 16; /* Number of env. vars */
Mark Whitley59ab0252001-01-23 22:30:04 +0000128static const int LOG = 0x1;
129static const int CONSOLE = 0x2;
Eric Andersenfedce062001-11-17 07:27:14 +0000130#if defined BB_FEATURE_EXTRA_QUIET
131static const int MAYBE_CONSOLE = 0x0;
132#else
133#define MAYBE_CONSOLE CONSOLE
134#endif
135
Erik Andersen7dc16072000-01-04 01:10:25 +0000136
137/* Allowed init action types */
138typedef enum {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000139 SYSINIT = 1,
140 RESPAWN,
141 ASKFIRST,
142 WAIT,
Erik Andersene132f4b2000-02-09 04:16:43 +0000143 ONCE,
Eric Andersenc97ec342001-04-03 18:01:51 +0000144 CTRLALTDEL,
Eric Andersen730f8262001-12-17 23:13:08 +0000145 SHUTDOWN,
146 RESTART
Erik Andersen7dc16072000-01-04 01:10:25 +0000147} initActionEnum;
148
Erik Andersen42094cd2000-03-20 21:34:52 +0000149/* A mapping between "inittab" action name strings and action type codes. */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000150typedef struct initActionType {
151 const char *name;
152 initActionEnum action;
Erik Andersen7dc16072000-01-04 01:10:25 +0000153} initActionType;
154
155static const struct initActionType actions[] = {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000156 {"sysinit", SYSINIT},
157 {"respawn", RESPAWN},
158 {"askfirst", ASKFIRST},
159 {"wait", WAIT},
160 {"once", ONCE},
Erik Andersene132f4b2000-02-09 04:16:43 +0000161 {"ctrlaltdel", CTRLALTDEL},
Eric Andersenc97ec342001-04-03 18:01:51 +0000162 {"shutdown", SHUTDOWN},
Eric Andersen730f8262001-12-17 23:13:08 +0000163 {"restart", RESTART},
Pavel Roskin9027bcf2000-07-14 15:44:25 +0000164 {0, 0}
Erik Andersen7dc16072000-01-04 01:10:25 +0000165};
166
Erik Andersen42094cd2000-03-20 21:34:52 +0000167/* Set up a linked list of initActions, to be read from inittab */
Erik Andersen7dc16072000-01-04 01:10:25 +0000168typedef struct initActionTag initAction;
169struct initActionTag {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000170 pid_t pid;
171 char process[256];
172 char console[256];
173 initAction *nextPtr;
174 initActionEnum action;
Erik Andersen7dc16072000-01-04 01:10:25 +0000175};
Eric Andersen3e6ff902001-03-09 21:24:12 +0000176static initAction *initActionList = NULL;
Erik Andersen7dc16072000-01-04 01:10:25 +0000177
178
Matt Kraai439e3df2001-07-23 14:52:08 +0000179static char *secondConsole = VC_2;
180static char *thirdConsole = VC_3;
181static char *fourthConsole = VC_4;
182static char *log = VC_5;
Erik Andersen42094cd2000-03-20 21:34:52 +0000183static int kernelVersion = 0;
184static char termType[32] = "TERM=linux";
185static char console[32] = _PATH_CONSOLE;
Eric Andersened8a9be2001-11-30 19:10:58 +0000186sig_atomic_t got_cont = 0;
Erik Andersen42094cd2000-03-20 21:34:52 +0000187
Erik Andersene132f4b2000-02-09 04:16:43 +0000188static void delete_initAction(initAction * action);
Eric Andersen0460ff21999-10-25 23:32:44 +0000189
Eric Andersen74400cc2001-10-18 04:11:39 +0000190static void loop_forever(void)
Matt Kraai67a46402001-06-03 05:55:52 +0000191{
192 while (1)
193 sleep (1);
194}
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000195
Erik Andersen42094cd2000-03-20 21:34:52 +0000196/* Print a message to the specified device.
197 * Device may be bitwise-or'd from LOG | CONSOLE */
Eric Andersenfedce062001-11-17 07:27:14 +0000198#ifdef DEBUG_INIT
199static inline messageND(int device, char *fmt, ...) { }
200#else
201#define messageND message
202#endif
Erik Andersen42094cd2000-03-20 21:34:52 +0000203static void message(int device, char *fmt, ...)
Erik Andersen93d65132000-04-06 08:06:36 +0000204 __attribute__ ((format (printf, 2, 3)));
205static void message(int device, char *fmt, ...)
Eric Andersen0460ff21999-10-25 23:32:44 +0000206{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000207 va_list arguments;
208 int fd;
Erik Andersen7dc16072000-01-04 01:10:25 +0000209
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000210#ifdef CONFIG_SYSLOGD
Eric Andersen4c781471999-11-26 08:12:56 +0000211
Erik Andersene49d5ec2000-02-08 19:58:47 +0000212 /* Log the message to syslogd */
213 if (device & LOG) {
214 char msg[1024];
Eric Andersen4c781471999-11-26 08:12:56 +0000215
Erik Andersene49d5ec2000-02-08 19:58:47 +0000216 va_start(arguments, fmt);
217 vsnprintf(msg, sizeof(msg), fmt, arguments);
218 va_end(arguments);
Eric Andersen1644db92001-09-05 20:18:15 +0000219 syslog_msg(LOG_USER, LOG_USER|LOG_INFO, msg);
Eric Andersen3ae0c781999-11-04 01:13:21 +0000220 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000221#else
222 static int log_fd = -1;
223
224 /* Take full control of the log tty, and never close it.
225 * It's mine, all mine! Muhahahaha! */
226 if (log_fd < 0) {
227 if (log == NULL) {
228 /* don't even try to log, because there is no such console */
229 log_fd = -2;
230 /* log to main console instead */
231 device = CONSOLE;
Erik Andersene132f4b2000-02-09 04:16:43 +0000232 } else if ((log_fd = device_open(log, O_RDWR|O_NDELAY)) < 0) {
233 log_fd = -2;
Eric Andersen72f9a422001-10-28 05:12:20 +0000234 fprintf(stderr, "Bummer, can't write to log on %s!\n", log);
Erik Andersene132f4b2000-02-09 04:16:43 +0000235 log = NULL;
236 device = CONSOLE;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000237 }
238 }
239 if ((device & LOG) && (log_fd >= 0)) {
240 va_start(arguments, fmt);
241 vdprintf(log_fd, fmt, arguments);
242 va_end(arguments);
243 }
Eric Andersen4c781471999-11-26 08:12:56 +0000244#endif
245
Erik Andersene49d5ec2000-02-08 19:58:47 +0000246 if (device & CONSOLE) {
247 /* Always send console messages to /dev/console so people will see them. */
248 if (
249 (fd =
250 device_open(_PATH_CONSOLE,
251 O_WRONLY | O_NOCTTY | O_NDELAY)) >= 0) {
252 va_start(arguments, fmt);
253 vdprintf(fd, fmt, arguments);
254 va_end(arguments);
255 close(fd);
256 } else {
257 fprintf(stderr, "Bummer, can't print: ");
258 va_start(arguments, fmt);
259 vfprintf(stderr, fmt, arguments);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000260 va_end(arguments);
261 }
Eric Andersen3ae0c781999-11-04 01:13:21 +0000262 }
Eric Andersencc8ed391999-10-05 16:24:54 +0000263}
264
Eric Andersen0460ff21999-10-25 23:32:44 +0000265/* Set terminal settings to reasonable defaults */
Eric Andersen3e6ff902001-03-09 21:24:12 +0000266static void set_term(int fd)
Eric Andersencc8ed391999-10-05 16:24:54 +0000267{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000268 struct termios tty;
Eric Andersencc8ed391999-10-05 16:24:54 +0000269
Erik Andersene49d5ec2000-02-08 19:58:47 +0000270 tcgetattr(fd, &tty);
Eric Andersencc8ed391999-10-05 16:24:54 +0000271
Erik Andersene49d5ec2000-02-08 19:58:47 +0000272 /* set control chars */
Eric Andersen3849f9b2000-07-10 19:56:47 +0000273 tty.c_cc[VINTR] = 3; /* C-c */
274 tty.c_cc[VQUIT] = 28; /* C-\ */
275 tty.c_cc[VERASE] = 127; /* C-? */
276 tty.c_cc[VKILL] = 21; /* C-u */
277 tty.c_cc[VEOF] = 4; /* C-d */
278 tty.c_cc[VSTART] = 17; /* C-q */
279 tty.c_cc[VSTOP] = 19; /* C-s */
280 tty.c_cc[VSUSP] = 26; /* C-z */
Eric Andersen02bc25b2000-07-06 21:29:32 +0000281
Erik Andersene49d5ec2000-02-08 19:58:47 +0000282 /* use line dicipline 0 */
283 tty.c_line = 0;
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000284
Erik Andersene49d5ec2000-02-08 19:58:47 +0000285 /* Make it be sane */
Erik Andersen6c41c442000-03-19 05:13:49 +0000286 tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD;
Eric Andersend8862922001-04-23 15:14:11 +0000287 tty.c_cflag |= CREAD|HUPCL|CLOCAL;
288
Eric Andersen08b10341999-11-19 02:38:58 +0000289
Erik Andersene49d5ec2000-02-08 19:58:47 +0000290 /* input modes */
291 tty.c_iflag = ICRNL | IXON | IXOFF;
Eric Andersen08b10341999-11-19 02:38:58 +0000292
Erik Andersene49d5ec2000-02-08 19:58:47 +0000293 /* output modes */
294 tty.c_oflag = OPOST | ONLCR;
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000295
Erik Andersene49d5ec2000-02-08 19:58:47 +0000296 /* local modes */
297 tty.c_lflag =
298 ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN;
Eric Andersencc8ed391999-10-05 16:24:54 +0000299
Erik Andersene49d5ec2000-02-08 19:58:47 +0000300 tcsetattr(fd, TCSANOW, &tty);
Eric Andersencc8ed391999-10-05 16:24:54 +0000301}
302
Eric Andersenbc5941a2000-12-06 23:17:37 +0000303/* How much memory does this machine have?
304 Units are kBytes to avoid overflow on 4GB machines */
Eric Andersen74400cc2001-10-18 04:11:39 +0000305static int check_free_memory(void)
Eric Andersencc8ed391999-10-05 16:24:54 +0000306{
Erik Andersend07ee462000-02-21 21:26:32 +0000307 struct sysinfo info;
Eric Andersenbc5941a2000-12-06 23:17:37 +0000308 unsigned int result, u, s=10;
Eric Andersencc8ed391999-10-05 16:24:54 +0000309
Erik Andersend07ee462000-02-21 21:26:32 +0000310 if (sysinfo(&info) != 0) {
Eric Andersen53cfb7e2001-01-31 17:29:47 +0000311 perror_msg("Error checking free memory");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000312 return -1;
Eric Andersenabc7d591999-10-19 00:27:50 +0000313 }
Eric Andersenbc5941a2000-12-06 23:17:37 +0000314
315 /* Kernels 2.0.x and 2.2.x return info.mem_unit==0 with values in bytes.
316 * Kernels 2.4.0 return info.mem_unit in bytes. */
317 u = info.mem_unit;
318 if (u==0) u=1;
319 while ( (u&1) == 0 && s > 0 ) { u>>=1; s--; }
320 result = (info.totalram>>s) + (info.totalswap>>s);
321 result = result*u;
322 if (result < 0) result = INT_MAX;
323 return result;
Eric Andersencc8ed391999-10-05 16:24:54 +0000324}
325
Eric Andersen74400cc2001-10-18 04:11:39 +0000326static void console_init(void)
Eric Andersen0460ff21999-10-25 23:32:44 +0000327{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000328 int fd;
329 int tried_devcons = 0;
330 int tried_vtprimary = 0;
Erik Andersen029011b2000-03-04 21:19:32 +0000331 struct vt_stat vt;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000332 struct serial_struct sr;
333 char *s;
Eric Andersen0460ff21999-10-25 23:32:44 +0000334
Erik Andersene49d5ec2000-02-08 19:58:47 +0000335 if ((s = getenv("TERM")) != NULL) {
336 snprintf(termType, sizeof(termType) - 1, "TERM=%s", s);
337 }
Erik Andersenac6e71f2000-01-08 22:04:33 +0000338
Erik Andersene49d5ec2000-02-08 19:58:47 +0000339 if ((s = getenv("CONSOLE")) != NULL) {
Matt Kraai18447702001-05-18 21:24:58 +0000340 safe_strncpy(console, s, sizeof(console));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000341 }
Eric Andersenfbb39c81999-11-08 17:00:52 +0000342#if #cpu(sparc)
Erik Andersene49d5ec2000-02-08 19:58:47 +0000343 /* sparc kernel supports console=tty[ab] parameter which is also
344 * passed to init, so catch it here */
345 else if ((s = getenv("console")) != NULL) {
346 /* remap tty[ab] to /dev/ttyS[01] */
347 if (strcmp(s, "ttya") == 0)
Matt Kraai439e3df2001-07-23 14:52:08 +0000348 safe_strncpy(console, SC_0, sizeof(console));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000349 else if (strcmp(s, "ttyb") == 0)
Matt Kraai439e3df2001-07-23 14:52:08 +0000350 safe_strncpy(console, SC_1, sizeof(console));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000351 }
Eric Andersen219d6f51999-11-02 19:43:01 +0000352#endif
Erik Andersene49d5ec2000-02-08 19:58:47 +0000353 else {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000354 /* 2.2 kernels: identify the real console backend and try to use it */
355 if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
356 /* this is a serial console */
Matt Kraai439e3df2001-07-23 14:52:08 +0000357 snprintf(console, sizeof(console) - 1, SC_FORMAT, sr.line);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000358 } else if (ioctl(0, VT_GETSTATE, &vt) == 0) {
359 /* this is linux virtual tty */
Matt Kraai439e3df2001-07-23 14:52:08 +0000360 snprintf(console, sizeof(console) - 1, VC_FORMAT, vt.v_active);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000361 } else {
Matt Kraai18447702001-05-18 21:24:58 +0000362 safe_strncpy(console, _PATH_CONSOLE, sizeof(console));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000363 tried_devcons++;
364 }
Eric Andersen07e52971999-11-07 07:38:08 +0000365 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000366
367 while ((fd = open(console, O_RDONLY | O_NONBLOCK)) < 0) {
368 /* Can't open selected console -- try /dev/console */
369 if (!tried_devcons) {
370 tried_devcons++;
Matt Kraai18447702001-05-18 21:24:58 +0000371 safe_strncpy(console, _PATH_CONSOLE, sizeof(console));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000372 continue;
373 }
374 /* Can't open selected console -- try vt1 */
375 if (!tried_vtprimary) {
376 tried_vtprimary++;
Matt Kraai439e3df2001-07-23 14:52:08 +0000377 safe_strncpy(console, VC_1, sizeof(console));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000378 continue;
379 }
380 break;
381 }
382 if (fd < 0) {
383 /* Perhaps we should panic here? */
Matt Kraai18447702001-05-18 21:24:58 +0000384 safe_strncpy(console, "/dev/null", sizeof(console));
Eric Andersen07e52971999-11-07 07:38:08 +0000385 } else {
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000386 /* check for serial console and disable logging to tty5 & running a
387 * shell to tty2-4 */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000388 if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000389 log = NULL;
390 secondConsole = NULL;
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000391 thirdConsole = NULL;
392 fourthConsole = NULL;
Erik Andersenfa4718e2000-02-21 19:25:12 +0000393 /* Force the TERM setting to vt102 for serial console --
394 * iff TERM is set to linux (the default) */
395 if (strcmp( termType, "TERM=linux" ) == 0)
Matt Kraai18447702001-05-18 21:24:58 +0000396 safe_strncpy(termType, "TERM=vt102", sizeof(termType));
Erik Andersene132f4b2000-02-09 04:16:43 +0000397 message(LOG | CONSOLE,
Eric Andersen72f9a422001-10-28 05:12:20 +0000398 "serial console detected. Disabling virtual terminals.\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000399 }
400 close(fd);
Eric Andersen07e52971999-11-07 07:38:08 +0000401 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000402 message(LOG, "console=%s\n", console);
Eric Andersen0460ff21999-10-25 23:32:44 +0000403}
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000404
405static void fixup_argv(int argc, char **argv, char *new_argv0)
406{
407 int len;
408 /* Fix up argv[0] to be certain we claim to be init */
409 len = strlen(argv[0]);
410 memset(argv[0], 0, len);
Eric Andersen72f9a422001-10-28 05:12:20 +0000411 safe_strncpy(argv[0], new_argv0, len + 1);
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000412
413 /* Wipe argv[1]-argv[N] so they don't clutter the ps listing */
414 len = 1;
415 while (argc > len) {
416 memset(argv[len], 0, strlen(argv[len]));
417 len++;
418 }
419}
420
Eric Andersen0460ff21999-10-25 23:32:44 +0000421
Erik Andersene49d5ec2000-02-08 19:58:47 +0000422static pid_t run(char *command, char *terminal, int get_enter)
Eric Andersen0460ff21999-10-25 23:32:44 +0000423{
Eric Andersen7f197852001-03-16 01:14:04 +0000424 int i, j;
Eric Andersen477aedd2001-02-20 18:01:50 +0000425 int fd;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000426 pid_t pid;
Eric Andersen7f197852001-03-16 01:14:04 +0000427 char *tmpCmd, *s;
428 char *cmd[255], *cmdpath;
Erik Andersene132f4b2000-02-09 04:16:43 +0000429 char buf[255];
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000430 struct stat sb;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000431 static const char press_enter[] =
432
Eric Andersen38624232001-01-25 00:04:16 +0000433#ifdef CUSTOMIZED_BANNER
434#include CUSTOMIZED_BANNER
435#endif
436
Erik Andersene49d5ec2000-02-08 19:58:47 +0000437 "\nPlease press Enter to activate this console. ";
Eric Andersen477aedd2001-02-20 18:01:50 +0000438 char *environment[MAXENV+1] = {
Eric Andersen7f197852001-03-16 01:14:04 +0000439 termType,
Erik Andersene49d5ec2000-02-08 19:58:47 +0000440 "HOME=/",
Eric Andersen72f9a422001-10-28 05:12:20 +0000441 "PATH=" _PATH_STDPATH,
Matt Kraai7bd773c2001-06-12 20:55:02 +0000442 "SHELL=" SHELL,
Eric Andersen7f197852001-03-16 01:14:04 +0000443 "USER=root",
444 NULL
Erik Andersene49d5ec2000-02-08 19:58:47 +0000445 };
Erik Andersenac6e71f2000-01-08 22:04:33 +0000446
Eric Andersen7f197852001-03-16 01:14:04 +0000447 /* inherit environment to the child, merging our values -andy */
448 for (i=0; environ[i]; i++) {
449 for (j=0; environment[j]; j++) {
450 s = strchr(environment[j], '=');
451 if (!strncmp(environ[i], environment[j], s - environment[j]))
452 break;
453 }
454 if (!environment[j]) {
455 environment[j++] = environ[i];
456 environment[j] = NULL;
457 }
Eric Andersen477aedd2001-02-20 18:01:50 +0000458 }
459
Eric Andersen72f9a422001-10-28 05:12:20 +0000460#if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__)
461 if ((pid = fork()) == 0)
462#else
463 if ((pid = vfork()) == 0)
464#endif
465 {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000466 /* Clean up */
Eric Andersenfb6a5082000-09-13 16:15:29 +0000467 ioctl(0, TIOCNOTTY, 0);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000468 close(0);
469 close(1);
470 close(2);
471 setsid();
Eric Andersen0460ff21999-10-25 23:32:44 +0000472
Erik Andersene49d5ec2000-02-08 19:58:47 +0000473 /* Reset signal handlers set for parent process */
474 signal(SIGUSR1, SIG_DFL);
475 signal(SIGUSR2, SIG_DFL);
476 signal(SIGINT, SIG_DFL);
477 signal(SIGTERM, SIG_DFL);
478 signal(SIGHUP, SIG_DFL);
Eric Andersened8a9be2001-11-30 19:10:58 +0000479 signal(SIGCONT, SIG_DFL);
480 signal(SIGSTOP, SIG_DFL);
481 signal(SIGTSTP, SIG_DFL);
Eric Andersen2f6c04f1999-11-01 23:59:44 +0000482
Erik Andersene49d5ec2000-02-08 19:58:47 +0000483 if ((fd = device_open(terminal, O_RDWR)) < 0) {
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000484 if (stat(terminal, &sb) != 0) {
Eric Andersen53f50612001-03-14 09:01:11 +0000485 message(LOG | CONSOLE, "device '%s' does not exist.\n",
486 terminal);
487 exit(1);
488 }
Eric Andersen72f9a422001-10-28 05:12:20 +0000489 message(LOG | CONSOLE, "Bummer, can't open %s\n", terminal);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000490 exit(1);
491 }
492 dup2(fd, 0);
493 dup2(fd, 1);
494 dup2(fd, 2);
Eric Andersenfb6a5082000-09-13 16:15:29 +0000495 ioctl(0, TIOCSCTTY, 1);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000496 tcsetpgrp(0, getpgrp());
497 set_term(0);
498
Erik Andersene132f4b2000-02-09 04:16:43 +0000499 /* See if any special /bin/sh requiring characters are present */
500 if (strpbrk(command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
501 cmd[0] = SHELL;
502 cmd[1] = "-c";
503 strcpy(buf, "exec ");
Eric Andersen72f9a422001-10-28 05:12:20 +0000504 safe_strncpy(buf + sizeof("exec "), command,
505 sizeof(buf) - sizeof("exec "));
Erik Andersene132f4b2000-02-09 04:16:43 +0000506 cmd[2] = buf;
507 cmd[3] = NULL;
508 } else {
509 /* Convert command (char*) into cmd (char**, one word per string) */
Eric Andersen72f9a422001-10-28 05:12:20 +0000510 safe_strncpy(buf, command, sizeof(buf));
511 s = buf;
512 for (tmpCmd = buf, i = 0;
513 (tmpCmd = strsep(&s, " \t")) != NULL;) {
Erik Andersene132f4b2000-02-09 04:16:43 +0000514 if (*tmpCmd != '\0') {
515 cmd[i] = tmpCmd;
516 tmpCmd++;
517 i++;
518 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000519 }
Erik Andersene132f4b2000-02-09 04:16:43 +0000520 cmd[i] = NULL;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000521 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000522
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000523 cmdpath = cmd[0];
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000524
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000525 /*
526 Interactive shells want to see a dash in argv[0]. This
527 typically is handled by login, argv will be setup this
528 way if a dash appears at the front of the command path
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000529 (like "-/bin/sh").
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000530 */
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000531
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000532 if (*cmdpath == '-') {
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000533
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000534 /* skip over the dash */
535 ++cmdpath;
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000536
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000537 /* find the last component in the command pathname */
538 s = get_last_path_component(cmdpath);
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000539
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000540 /* make a new argv[0] */
541 if ((cmd[0] = malloc(strlen(s)+2)) == NULL) {
542 message(LOG | CONSOLE, "malloc failed");
543 cmd[0] = cmdpath;
544 } else {
545 cmd[0][0] = '-';
546 strcpy(cmd[0]+1, s);
547 }
548 }
549
550 if (get_enter == TRUE) {
551 /*
552 * Save memory by not exec-ing anything large (like a shell)
553 * before the user wants it. This is critical if swap is not
554 * enabled and the system has low memory. Generally this will
555 * be run on the second virtual console, and the first will
556 * be allowed to start a shell or whatever an init script
557 * specifies.
558 */
Eric Andersenfedce062001-11-17 07:27:14 +0000559 messageND(LOG, "Waiting for enter to start '%s' (pid %d, console %s)\n",
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000560 cmd[0], getpid(), terminal);
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000561 write(fileno(stdout), press_enter, sizeof(press_enter) - 1);
562 getc(stdin);
563 }
564
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000565 /* Log the process name and args */
Eric Andersenfedce062001-11-17 07:27:14 +0000566 messageND(LOG, "Starting pid %d, console %s: '%s'\n",
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000567 getpid(), terminal, command);
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000568
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000569#if defined CONFIG_FEATURE_INIT_COREDUMPS
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000570 if (stat (CORE_ENABLE_FLAG_FILE, &sb) == 0) {
571 struct rlimit limit;
572 limit.rlim_cur = RLIM_INFINITY;
573 limit.rlim_max = RLIM_INFINITY;
574 setrlimit(RLIMIT_CORE, &limit);
Erik Andersen983b51b2000-04-04 18:14:25 +0000575 }
Erik Andersen183da4a2000-04-04 18:36:37 +0000576#endif
Erik Andersen983b51b2000-04-04 18:14:25 +0000577
Erik Andersene49d5ec2000-02-08 19:58:47 +0000578 /* Now run it. The new program will take over this PID,
579 * so nothing further in init.c should be run. */
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000580 execve(cmdpath, cmd, environment);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000581
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000582 /* We're still here? Some error happened. */
583 message(LOG | CONSOLE, "Bummer, could not run '%s': %s\n", cmdpath,
584 strerror(errno));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000585 exit(-1);
Erik Andersen05df2392000-01-13 04:43:48 +0000586 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000587 return pid;
Eric Andersen0460ff21999-10-25 23:32:44 +0000588}
589
Erik Andersene49d5ec2000-02-08 19:58:47 +0000590static int waitfor(char *command, char *terminal, int get_enter)
Erik Andersen0e3782f2000-01-07 02:54:55 +0000591{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000592 int status, wpid;
593 int pid = run(command, terminal, get_enter);
Erik Andersen0e3782f2000-01-07 02:54:55 +0000594
Erik Andersene49d5ec2000-02-08 19:58:47 +0000595 while (1) {
596 wpid = wait(&status);
Erik Andersene132f4b2000-02-09 04:16:43 +0000597 if (wpid > 0 && wpid != pid) {
598 continue;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000599 }
600 if (wpid == pid)
601 break;
Erik Andersen0e3782f2000-01-07 02:54:55 +0000602 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000603 return wpid;
Erik Andersen0e3782f2000-01-07 02:54:55 +0000604}
605
Eric Andersen219d6f51999-11-02 19:43:01 +0000606/* Make sure there is enough memory to do something useful. *
Erik Andersene132f4b2000-02-09 04:16:43 +0000607 * Calls "swapon -a" if needed so be sure /etc/fstab is present... */
Eric Andersen74400cc2001-10-18 04:11:39 +0000608static void check_memory(void)
Eric Andersen219d6f51999-11-02 19:43:01 +0000609{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000610 struct stat statBuf;
Eric Andersen219d6f51999-11-02 19:43:01 +0000611
Erik Andersend07ee462000-02-21 21:26:32 +0000612 if (check_free_memory() > 1000)
Erik Andersene49d5ec2000-02-08 19:58:47 +0000613 return;
614
Eric Andersen72f9a422001-10-28 05:12:20 +0000615#if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__)
Erik Andersene49d5ec2000-02-08 19:58:47 +0000616 if (stat("/etc/fstab", &statBuf) == 0) {
Erik Andersen61677fe2000-04-13 01:18:56 +0000617 /* swapon -a requires /proc typically */
618 waitfor("mount proc /proc -t proc", console, FALSE);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000619 /* Try to turn on swap */
Erik Andersen61677fe2000-04-13 01:18:56 +0000620 waitfor("swapon -a", console, FALSE);
Erik Andersend07ee462000-02-21 21:26:32 +0000621 if (check_free_memory() < 1000)
Erik Andersene49d5ec2000-02-08 19:58:47 +0000622 goto goodnight;
623 } else
624 goto goodnight;
Eric Andersen219d6f51999-11-02 19:43:01 +0000625 return;
Eric Andersen72f9a422001-10-28 05:12:20 +0000626#endif
Eric Andersen219d6f51999-11-02 19:43:01 +0000627
Erik Andersene49d5ec2000-02-08 19:58:47 +0000628 goodnight:
629 message(CONSOLE,
Eric Andersen72f9a422001-10-28 05:12:20 +0000630 "Sorry, your computer does not have enough memory.\n");
Matt Kraai67a46402001-06-03 05:55:52 +0000631 loop_forever();
Eric Andersen219d6f51999-11-02 19:43:01 +0000632}
633
Erik Andersene132f4b2000-02-09 04:16:43 +0000634/* Run all commands to be run right before halt/reboot */
Eric Andersenc97ec342001-04-03 18:01:51 +0000635static void run_actions(initActionEnum action)
Erik Andersene132f4b2000-02-09 04:16:43 +0000636{
Eric Andersen0d4e51d2001-03-15 19:18:21 +0000637 initAction *a, *tmp;
Eric Andersena4edd0e2001-03-15 21:04:18 +0000638 for (a = initActionList; a; a = tmp) {
639 tmp = a->nextPtr;
Eric Andersenc97ec342001-04-03 18:01:51 +0000640 if (a->action == action) {
Erik Andersene132f4b2000-02-09 04:16:43 +0000641 waitfor(a->process, a->console, FALSE);
642 delete_initAction(a);
643 }
644 }
645}
646
647
Erik Andersen7dc16072000-01-04 01:10:25 +0000648#ifndef DEBUG_INIT
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000649static void shutdown_system(void)
Eric Andersencc8ed391999-10-05 16:24:54 +0000650{
Eric Andersen813d88c2001-10-28 22:49:48 +0000651 sigset_t block_signals;
Erik Andersene132f4b2000-02-09 04:16:43 +0000652
Eric Andersen72f9a422001-10-28 05:12:20 +0000653 /* first disable all our signals */
654 sigemptyset(&block_signals);
655 sigaddset(&block_signals, SIGHUP);
656 sigaddset(&block_signals, SIGCHLD);
657 sigaddset(&block_signals, SIGUSR1);
658 sigaddset(&block_signals, SIGUSR2);
659 sigaddset(&block_signals, SIGINT);
660 sigaddset(&block_signals, SIGTERM);
Eric Andersened8a9be2001-11-30 19:10:58 +0000661 sigaddset(&block_signals, SIGCONT);
662 sigaddset(&block_signals, SIGSTOP);
663 sigaddset(&block_signals, SIGTSTP);
Eric Andersen72f9a422001-10-28 05:12:20 +0000664 sigprocmask(SIG_BLOCK, &block_signals, NULL);
Erik Andersen7dc16072000-01-04 01:10:25 +0000665
Erik Andersene49d5ec2000-02-08 19:58:47 +0000666 /* Allow Ctrl-Alt-Del to reboot system. */
Erik Andersen4f3f7572000-04-28 00:18:56 +0000667 init_reboot(RB_ENABLE_CAD);
Erik Andersene132f4b2000-02-09 04:16:43 +0000668
Eric Andersen72f9a422001-10-28 05:12:20 +0000669 message(CONSOLE|LOG, "\nThe system is going down NOW !!\n");
Eric Andersencf8c9cf1999-11-05 00:31:46 +0000670 sync();
Erik Andersene49d5ec2000-02-08 19:58:47 +0000671
672 /* Send signals to every process _except_ pid 1 */
Eric Andersen72f9a422001-10-28 05:12:20 +0000673 message(CONSOLE|LOG, "Sending SIGTERM to all processes.\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000674 kill(-1, SIGTERM);
Erik Andersene132f4b2000-02-09 04:16:43 +0000675 sleep(1);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000676 sync();
677
Eric Andersen72f9a422001-10-28 05:12:20 +0000678 message(CONSOLE|LOG, "Sending SIGKILL to all processes.\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000679 kill(-1, SIGKILL);
Erik Andersene132f4b2000-02-09 04:16:43 +0000680 sleep(1);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000681
Matt Kraai8fc364e2001-04-12 20:12:16 +0000682 /* run everything to be run at "shutdown" */
Eric Andersenc97ec342001-04-03 18:01:51 +0000683 run_actions(SHUTDOWN);
Erik Andersene132f4b2000-02-09 04:16:43 +0000684
Erik Andersene49d5ec2000-02-08 19:58:47 +0000685 sync();
Eric Andersenbd22ed82000-07-08 18:55:24 +0000686 if (kernelVersion > 0 && kernelVersion <= KERNEL_VERSION(2,2,11)) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000687 /* bdflush, kupdate not needed for kernels >2.2.11 */
688 bdflush(1, 0);
689 sync();
690 }
Eric Andersencc8ed391999-10-05 16:24:54 +0000691}
692
Eric Andersen730f8262001-12-17 23:13:08 +0000693static void exec_signal(int sig)
694{
695 initAction *a, *tmp;
696 for (a = initActionList; a; a = tmp) {
697 tmp = a->nextPtr;
698 if (a->action == RESTART) {
699 shutdown_system();
700 message(CONSOLE|LOG, "Trying to re-exec %s\n", a->process);
701 execl(a->process, a->process, NULL);
702
703 message(CONSOLE|LOG, "execl of %s failed: %s\n",
704 a->process, sys_errlist[errno]);
705 sync();
706 sleep(2);
707 init_reboot(RB_HALT_SYSTEM);
708 loop_forever();
709 }
710 }
711}
712
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000713static void halt_signal(int sig)
Eric Andersencc8ed391999-10-05 16:24:54 +0000714{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000715 shutdown_system();
Erik Andersene132f4b2000-02-09 04:16:43 +0000716 message(CONSOLE|LOG,
Eric Andersenf435a912001-11-20 05:42:57 +0000717#if #cpu(s390)
718 /* Seems the s390 console is Wierd(tm). */
Eric Andersen2480e3a2001-11-21 09:05:31 +0000719 "The system is halted. You may reboot now.\n"
Eric Andersenf435a912001-11-20 05:42:57 +0000720#else
721 /* secondConsole is NULL for a serial console */
Eric Andersen72f9a422001-10-28 05:12:20 +0000722 "The system is halted. Press %s or turn off power\n",
Eric Andersenf435a912001-11-20 05:42:57 +0000723 (secondConsole == NULL)? "Reset" : "CTRL-ALT-DEL"
724#endif
725 );
Erik Andersene49d5ec2000-02-08 19:58:47 +0000726 sync();
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000727
Erik Andersene49d5ec2000-02-08 19:58:47 +0000728 /* allow time for last message to reach serial console */
Erik Andersene132f4b2000-02-09 04:16:43 +0000729 sleep(2);
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000730
Eric Andersenbd22ed82000-07-08 18:55:24 +0000731 if (sig == SIGUSR2 && kernelVersion >= KERNEL_VERSION(2,2,0))
Erik Andersen4f3f7572000-04-28 00:18:56 +0000732 init_reboot(RB_POWER_OFF);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000733 else
Erik Andersen4f3f7572000-04-28 00:18:56 +0000734 init_reboot(RB_HALT_SYSTEM);
Matt Kraai67a46402001-06-03 05:55:52 +0000735
736 loop_forever();
Eric Andersencc8ed391999-10-05 16:24:54 +0000737}
738
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000739static void reboot_signal(int sig)
Eric Andersencc8ed391999-10-05 16:24:54 +0000740{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000741 shutdown_system();
Eric Andersen72f9a422001-10-28 05:12:20 +0000742 message(CONSOLE|LOG, "Please stand by while rebooting the system.\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000743 sync();
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000744
Erik Andersene49d5ec2000-02-08 19:58:47 +0000745 /* allow time for last message to reach serial console */
746 sleep(2);
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000747
Erik Andersen4f3f7572000-04-28 00:18:56 +0000748 init_reboot(RB_AUTOBOOT);
Matt Kraai67a46402001-06-03 05:55:52 +0000749
750 loop_forever();
Eric Andersencc8ed391999-10-05 16:24:54 +0000751}
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000752
Eric Andersenc97ec342001-04-03 18:01:51 +0000753static void ctrlaltdel_signal(int sig)
754{
755 run_actions(CTRLALTDEL);
756}
757
Eric Andersened8a9be2001-11-30 19:10:58 +0000758/*
759 * The SIGSTOP & SIGTSTP handler
760 */
761static void stop_handler(int sig)
762{
763 int saved_errno = errno;
764
765 got_cont = 0;
766 while(!got_cont) pause();
767 got_cont = 0;
768 errno = saved_errno;
769}
770
771/*
772 * The SIGCONT handler
773 */
774static void cont_handler(int sig)
775{
776 got_cont = 1;
777}
778
Erik Andersene49d5ec2000-02-08 19:58:47 +0000779#endif /* ! DEBUG_INIT */
Erik Andersende552872000-01-23 01:34:05 +0000780
Eric Andersen3e6ff902001-03-09 21:24:12 +0000781static void new_initAction(initActionEnum action, char *process, char *cons)
Erik Andersen7dc16072000-01-04 01:10:25 +0000782{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000783 initAction *newAction;
Eric Andersen1644db92001-09-05 20:18:15 +0000784 initAction *a;
Erik Andersen9e737252000-01-06 01:16:13 +0000785
Erik Andersene49d5ec2000-02-08 19:58:47 +0000786 if (*cons == '\0')
787 cons = console;
Erik Andersen9e737252000-01-06 01:16:13 +0000788
Erik Andersene49d5ec2000-02-08 19:58:47 +0000789 /* If BusyBox detects that a serial console is in use,
790 * then entries not refering to the console or null devices will _not_ be run.
791 * The exception to this rule is the null device.
792 */
793 if (secondConsole == NULL && strcmp(cons, console)
794 && strcmp(cons, "/dev/null"))
795 return;
Eric Andersen1644db92001-09-05 20:18:15 +0000796 if (strcmp(cons, "/dev/null") == 0 && action == ASKFIRST)
797 return;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000798
799 newAction = calloc((size_t) (1), sizeof(initAction));
800 if (!newAction) {
801 message(LOG | CONSOLE, "Memory allocation failure\n");
Matt Kraai67a46402001-06-03 05:55:52 +0000802 loop_forever();
Erik Andersene49d5ec2000-02-08 19:58:47 +0000803 }
Eric Andersen1644db92001-09-05 20:18:15 +0000804 for (a = initActionList; a && a->nextPtr; a = a->nextPtr) ;
805 if (a) {
806 a->nextPtr = newAction;
807 } else {
808 initActionList = newAction;
809 }
Eric Andersen72f9a422001-10-28 05:12:20 +0000810 safe_strncpy(newAction->process, process, 255);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000811 newAction->action = action;
Eric Andersen72f9a422001-10-28 05:12:20 +0000812 safe_strncpy(newAction->console, cons, 255);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000813 newAction->pid = 0;
Erik Andersen31638212000-01-15 22:28:50 +0000814// message(LOG|CONSOLE, "process='%s' action='%d' console='%s'\n",
Erik Andersene49d5ec2000-02-08 19:58:47 +0000815// newAction->process, newAction->action, newAction->console);
Erik Andersen7dc16072000-01-04 01:10:25 +0000816}
817
Erik Andersene132f4b2000-02-09 04:16:43 +0000818static void delete_initAction(initAction * action)
Erik Andersen7dc16072000-01-04 01:10:25 +0000819{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000820 initAction *a, *b = NULL;
821
822 for (a = initActionList; a; b = a, a = a->nextPtr) {
823 if (a == action) {
824 if (b == NULL) {
825 initActionList = a->nextPtr;
826 } else {
827 b->nextPtr = a->nextPtr;
828 }
829 free(a);
830 break;
831 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000832 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000833}
834
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000835/* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined,
Erik Andersen9e737252000-01-06 01:16:13 +0000836 * then parse_inittab() simply adds in some default
Eric Andersen77d92682001-05-23 20:32:09 +0000837 * actions(i.e., runs INIT_SCRIPT and then starts a pair
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000838 * of "askfirst" shells). If CONFIG_FEATURE_USE_INITTAB
Erik Andersen812d4662000-01-07 18:30:40 +0000839 * _is_ defined, but /etc/inittab is missing, this
840 * results in the same set of default behaviors.
Erik Andersen9e737252000-01-06 01:16:13 +0000841 * */
Eric Andersen3e6ff902001-03-09 21:24:12 +0000842static void parse_inittab(void)
Erik Andersen7dc16072000-01-04 01:10:25 +0000843{
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000844#ifdef CONFIG_FEATURE_USE_INITTAB
Erik Andersene49d5ec2000-02-08 19:58:47 +0000845 FILE *file;
846 char buf[256], lineAsRead[256], tmpConsole[256];
Eric Andersenb5966362000-05-31 20:04:38 +0000847 char *id, *runlev, *action, *process, *eol;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000848 const struct initActionType *a = actions;
849 int foundIt;
Erik Andersen7dc16072000-01-04 01:10:25 +0000850
851
Erik Andersene49d5ec2000-02-08 19:58:47 +0000852 file = fopen(INITTAB, "r");
853 if (file == NULL) {
854 /* No inittab file -- set up some default behavior */
Erik Andersen9e737252000-01-06 01:16:13 +0000855#endif
Eric Andersenc97ec342001-04-03 18:01:51 +0000856 /* Reboot on Ctrl-Alt-Del */
857 new_initAction(CTRLALTDEL, "/sbin/reboot", console);
Eric Andersen1644db92001-09-05 20:18:15 +0000858 /* Umount all filesystems on halt/reboot */
859 new_initAction(SHUTDOWN, "/bin/umount -a -r", console);
Eric Andersen72f9a422001-10-28 05:12:20 +0000860#if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__)
Eric Andersen1644db92001-09-05 20:18:15 +0000861 /* Swapoff on halt/reboot */
862 new_initAction(SHUTDOWN, "/sbin/swapoff -a", console);
Eric Andersen1644db92001-09-05 20:18:15 +0000863#endif
Eric Andersen730f8262001-12-17 23:13:08 +0000864 /* Prepare to restart init when a HUP is received */
865 new_initAction(RESTART, "/sbin/init", console);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000866 /* Askfirst shell on tty1 */
Matt Kraai7bd773c2001-06-12 20:55:02 +0000867 new_initAction(ASKFIRST, LOGIN_SHELL, console);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000868 /* Askfirst shell on tty2 */
869 if (secondConsole != NULL)
Matt Kraai7bd773c2001-06-12 20:55:02 +0000870 new_initAction(ASKFIRST, LOGIN_SHELL, secondConsole);
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000871 /* Askfirst shell on tty3 */
872 if (thirdConsole != NULL)
Matt Kraai7bd773c2001-06-12 20:55:02 +0000873 new_initAction(ASKFIRST, LOGIN_SHELL, thirdConsole);
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000874 /* Askfirst shell on tty4 */
875 if (fourthConsole != NULL)
Matt Kraai7bd773c2001-06-12 20:55:02 +0000876 new_initAction(ASKFIRST, LOGIN_SHELL, fourthConsole);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000877 /* sysinit */
878 new_initAction(SYSINIT, INIT_SCRIPT, console);
Erik Andersen7dc16072000-01-04 01:10:25 +0000879
Erik Andersene49d5ec2000-02-08 19:58:47 +0000880 return;
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000881#ifdef CONFIG_FEATURE_USE_INITTAB
Erik Andersen9e737252000-01-06 01:16:13 +0000882 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000883
Erik Andersene49d5ec2000-02-08 19:58:47 +0000884 while (fgets(buf, 255, file) != NULL) {
885 foundIt = FALSE;
Eric Andersenb5966362000-05-31 20:04:38 +0000886 /* Skip leading spaces */
887 for (id = buf; *id == ' ' || *id == '\t'; id++);
888
889 /* Skip the line if it's a comment */
890 if (*id == '#' || *id == '\n')
Erik Andersene49d5ec2000-02-08 19:58:47 +0000891 continue;
Erik Andersen7dc16072000-01-04 01:10:25 +0000892
Erik Andersene49d5ec2000-02-08 19:58:47 +0000893 /* Trim the trailing \n */
Eric Andersenb5966362000-05-31 20:04:38 +0000894 eol = strrchr(id, '\n');
895 if (eol != NULL)
896 *eol = '\0';
Erik Andersen7dc16072000-01-04 01:10:25 +0000897
Erik Andersene49d5ec2000-02-08 19:58:47 +0000898 /* Keep a copy around for posterity's sake (and error msgs) */
899 strcpy(lineAsRead, buf);
900
Eric Andersenb5966362000-05-31 20:04:38 +0000901 /* Separate the ID field from the runlevels */
902 runlev = strchr(id, ':');
903 if (runlev == NULL || *(runlev + 1) == '\0') {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000904 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
905 continue;
906 } else {
Eric Andersenb5966362000-05-31 20:04:38 +0000907 *runlev = '\0';
908 ++runlev;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000909 }
910
Eric Andersenb5966362000-05-31 20:04:38 +0000911 /* Separate the runlevels from the action */
912 action = strchr(runlev, ':');
913 if (action == NULL || *(action + 1) == '\0') {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000914 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
915 continue;
916 } else {
Eric Andersenb5966362000-05-31 20:04:38 +0000917 *action = '\0';
918 ++action;
919 }
920
921 /* Separate the action from the process */
922 process = strchr(action, ':');
923 if (process == NULL || *(process + 1) == '\0') {
924 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
925 continue;
926 } else {
927 *process = '\0';
928 ++process;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000929 }
930
931 /* Ok, now process it */
932 a = actions;
933 while (a->name != 0) {
Eric Andersenb5966362000-05-31 20:04:38 +0000934 if (strcmp(a->name, action) == 0) {
935 if (*id != '\0') {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000936 strcpy(tmpConsole, "/dev/");
Eric Andersenb5966362000-05-31 20:04:38 +0000937 strncat(tmpConsole, id, 200);
Eric Andersenb5966362000-05-31 20:04:38 +0000938 id = tmpConsole;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000939 }
Eric Andersenb5966362000-05-31 20:04:38 +0000940 new_initAction(a->action, process, id);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000941 foundIt = TRUE;
942 }
943 a++;
944 }
945 if (foundIt == TRUE)
946 continue;
947 else {
948 /* Choke on an unknown action */
949 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
950 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000951 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000952 return;
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000953#endif /* CONFIG_FEATURE_USE_INITTAB */
Erik Andersen7dc16072000-01-04 01:10:25 +0000954}
955
Erik Andersene132f4b2000-02-09 04:16:43 +0000956
957
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000958extern int init_main(int argc, char **argv)
Eric Andersen0460ff21999-10-25 23:32:44 +0000959{
Eric Andersen0d4e51d2001-03-15 19:18:21 +0000960 initAction *a, *tmp;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000961 pid_t wpid;
962 int status;
Eric Andersen0460ff21999-10-25 23:32:44 +0000963
Eric Andersen730f8262001-12-17 23:13:08 +0000964
965 if (argc > 1 && !strcmp(argv[1], "-q")) {
966 kill(1, SIGHUP);
967 exit(0);
968 }
969
Eric Andersend73dc5b1999-11-10 23:13:02 +0000970#ifndef DEBUG_INIT
Erik Andersena51ecdd2000-02-24 18:09:58 +0000971 /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
972 if (getpid() != 1
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000973#ifdef CONFIG_FEATURE_INITRD
Matt Kraaie58771e2000-07-12 15:38:49 +0000974 && strstr(applet_name, "linuxrc") == NULL
Erik Andersena51ecdd2000-02-24 18:09:58 +0000975#endif
976 )
977 {
Eric Andersen67991cf2001-02-14 21:23:06 +0000978 show_usage();
Erik Andersene49d5ec2000-02-08 19:58:47 +0000979 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000980 /* Set up sig handlers -- be sure to
981 * clear all of these in run() */
Eric Andersen730f8262001-12-17 23:13:08 +0000982 signal(SIGHUP, exec_signal);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000983 signal(SIGUSR1, halt_signal);
Eric Andersen4c95a282000-07-07 19:30:28 +0000984 signal(SIGUSR2, halt_signal);
Eric Andersenc97ec342001-04-03 18:01:51 +0000985 signal(SIGINT, ctrlaltdel_signal);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000986 signal(SIGTERM, reboot_signal);
Eric Andersened8a9be2001-11-30 19:10:58 +0000987 signal(SIGCONT, cont_handler);
988 signal(SIGSTOP, stop_handler);
989 signal(SIGTSTP, stop_handler);
Eric Andersen0460ff21999-10-25 23:32:44 +0000990
Erik Andersene49d5ec2000-02-08 19:58:47 +0000991 /* Turn off rebooting via CTL-ALT-DEL -- we get a
992 * SIGINT on CAD so we can shut things down gracefully... */
Erik Andersen4f3f7572000-04-28 00:18:56 +0000993 init_reboot(RB_DISABLE_CAD);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000994#endif
Erik Andersen05df2392000-01-13 04:43:48 +0000995
Erik Andersen298854f2000-03-23 01:09:18 +0000996 /* Figure out what kernel this is running */
997 kernelVersion = get_kernel_revision();
998
Erik Andersene49d5ec2000-02-08 19:58:47 +0000999 /* Close whatever files are open, and reset the console. */
1000 close(0);
1001 close(1);
1002 close(2);
Eric Andersen72f9a422001-10-28 05:12:20 +00001003
1004 /* Figure out where the default console should be */
1005 console_init();
1006
Erik Andersene49d5ec2000-02-08 19:58:47 +00001007 set_term(0);
Erik Andersen983b51b2000-04-04 18:14:25 +00001008 chdir("/");
Erik Andersene49d5ec2000-02-08 19:58:47 +00001009 setsid();
Eric Andersencc8ed391999-10-05 16:24:54 +00001010
Erik Andersene49d5ec2000-02-08 19:58:47 +00001011 /* Make sure PATH is set to something sane */
Eric Andersen452fd332001-03-04 06:47:33 +00001012 putenv("PATH="_PATH_STDPATH);
Eric Andersencc8ed391999-10-05 16:24:54 +00001013
Erik Andersene49d5ec2000-02-08 19:58:47 +00001014 /* Hello world */
Eric Andersenfedce062001-11-17 07:27:14 +00001015 message(MAYBE_CONSOLE|LOG, "init started: %s\n", full_version);
Eric Andersencc8ed391999-10-05 16:24:54 +00001016
Erik Andersene49d5ec2000-02-08 19:58:47 +00001017 /* Make sure there is enough memory to do something useful. */
1018 check_memory();
Erik Andersen9e737252000-01-06 01:16:13 +00001019
Erik Andersene49d5ec2000-02-08 19:58:47 +00001020 /* Check if we are supposed to be in single user mode */
1021 if (argc > 1 && (!strcmp(argv[1], "single") ||
1022 !strcmp(argv[1], "-s") || !strcmp(argv[1], "1"))) {
Eric Andersen7e3bf6e2000-09-14 22:01:31 +00001023 /* Ask first then start a shell on tty2-4 */
Erik Andersene49d5ec2000-02-08 19:58:47 +00001024 if (secondConsole != NULL)
Matt Kraai7bd773c2001-06-12 20:55:02 +00001025 new_initAction(ASKFIRST, LOGIN_SHELL, secondConsole);
Eric Andersen7e3bf6e2000-09-14 22:01:31 +00001026 if (thirdConsole != NULL)
Matt Kraai7bd773c2001-06-12 20:55:02 +00001027 new_initAction(ASKFIRST, LOGIN_SHELL, thirdConsole);
Eric Andersen7e3bf6e2000-09-14 22:01:31 +00001028 if (fourthConsole != NULL)
Matt Kraai7bd773c2001-06-12 20:55:02 +00001029 new_initAction(ASKFIRST, LOGIN_SHELL, fourthConsole);
Erik Andersene49d5ec2000-02-08 19:58:47 +00001030 /* Start a shell on tty1 */
Matt Kraai7bd773c2001-06-12 20:55:02 +00001031 new_initAction(RESPAWN, LOGIN_SHELL, console);
Erik Andersene49d5ec2000-02-08 19:58:47 +00001032 } else {
1033 /* Not in single user mode -- see what inittab says */
Eric Andersen8a8fbb81999-10-26 00:18:56 +00001034
Eric Andersenbdfd0d72001-10-24 05:00:29 +00001035 /* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined,
Erik Andersene49d5ec2000-02-08 19:58:47 +00001036 * then parse_inittab() simply adds in some default
Eric Andersen77d92682001-05-23 20:32:09 +00001037 * actions(i.e., runs INIT_SCRIPT and then starts a pair
Erik Andersene49d5ec2000-02-08 19:58:47 +00001038 * of "askfirst" shells */
1039 parse_inittab();
Eric Andersend00c2621999-12-07 08:37:31 +00001040 }
Erik Andersen983b51b2000-04-04 18:14:25 +00001041
Eric Andersen7ef1a5b2001-03-20 17:39:08 +00001042 /* Make the command line just say "init" -- thats all, nothing else */
1043 fixup_argv(argc, argv, "init");
Eric Andersen219d6f51999-11-02 19:43:01 +00001044
Erik Andersene49d5ec2000-02-08 19:58:47 +00001045 /* Now run everything that needs to be run */
1046
1047 /* First run the sysinit command */
Eric Andersen1644db92001-09-05 20:18:15 +00001048 run_actions(SYSINIT);
Erik Andersene49d5ec2000-02-08 19:58:47 +00001049 /* Next run anything that wants to block */
Eric Andersen1644db92001-09-05 20:18:15 +00001050 run_actions(WAIT);
Erik Andersene49d5ec2000-02-08 19:58:47 +00001051 /* Next run anything to be run only once */
Eric Andersena4edd0e2001-03-15 21:04:18 +00001052 for (a = initActionList; a; a = tmp) {
1053 tmp = a->nextPtr;
Erik Andersene49d5ec2000-02-08 19:58:47 +00001054 if (a->action == ONCE) {
1055 run(a->process, a->console, FALSE);
1056 /* Now remove the "once" entry from the list */
1057 delete_initAction(a);
1058 }
1059 }
1060 /* If there is nothing else to do, stop */
1061 if (initActionList == NULL) {
1062 message(LOG | CONSOLE,
1063 "No more tasks for init -- sleeping forever.\n");
Matt Kraai67a46402001-06-03 05:55:52 +00001064 loop_forever();
Erik Andersene49d5ec2000-02-08 19:58:47 +00001065 }
1066
1067 /* Now run the looping stuff for the rest of forever */
1068 while (1) {
1069 for (a = initActionList; a; a = a->nextPtr) {
1070 /* Only run stuff with pid==0. If they have
1071 * a pid, that means they are still running */
1072 if (a->pid == 0) {
1073 switch (a->action) {
1074 case RESPAWN:
1075 /* run the respawn stuff */
1076 a->pid = run(a->process, a->console, FALSE);
1077 break;
1078 case ASKFIRST:
1079 /* run the askfirst stuff */
1080 a->pid = run(a->process, a->console, TRUE);
1081 break;
1082 /* silence the compiler's incessant whining */
1083 default:
1084 break;
1085 }
1086 }
1087 }
1088 /* Wait for a child process to exit */
1089 wpid = wait(&status);
1090 if (wpid > 0) {
1091 /* Find out who died and clean up their corpse */
1092 for (a = initActionList; a; a = a->nextPtr) {
1093 if (a->pid == wpid) {
1094 a->pid = 0;
Eric Andersenfedce062001-11-17 07:27:14 +00001095 message(LOG, "Process '%s' (pid %d) exited. Scheduling it for restart.\n",
Erik Andersene49d5ec2000-02-08 19:58:47 +00001096 a->process, wpid);
1097 }
1098 }
1099 }
1100 sleep(1);
1101 }
Eric Andersencc8ed391999-10-05 16:24:54 +00001102}
Erik Andersen029011b2000-03-04 21:19:32 +00001103
1104/*
1105Local Variables:
1106c-file-style: "linux"
1107c-basic-offset: 4
1108tab-width: 4
1109End:
1110*/