blob: d0beb2a9a0f586f3323918f63bdc7c3c26ec53c4 [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,
145 SHUTDOWN
Erik Andersen7dc16072000-01-04 01:10:25 +0000146} initActionEnum;
147
Erik Andersen42094cd2000-03-20 21:34:52 +0000148/* A mapping between "inittab" action name strings and action type codes. */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000149typedef struct initActionType {
150 const char *name;
151 initActionEnum action;
Erik Andersen7dc16072000-01-04 01:10:25 +0000152} initActionType;
153
154static const struct initActionType actions[] = {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000155 {"sysinit", SYSINIT},
156 {"respawn", RESPAWN},
157 {"askfirst", ASKFIRST},
158 {"wait", WAIT},
159 {"once", ONCE},
Erik Andersene132f4b2000-02-09 04:16:43 +0000160 {"ctrlaltdel", CTRLALTDEL},
Eric Andersenc97ec342001-04-03 18:01:51 +0000161 {"shutdown", SHUTDOWN},
Pavel Roskin9027bcf2000-07-14 15:44:25 +0000162 {0, 0}
Erik Andersen7dc16072000-01-04 01:10:25 +0000163};
164
Erik Andersen42094cd2000-03-20 21:34:52 +0000165/* Set up a linked list of initActions, to be read from inittab */
Erik Andersen7dc16072000-01-04 01:10:25 +0000166typedef struct initActionTag initAction;
167struct initActionTag {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000168 pid_t pid;
169 char process[256];
170 char console[256];
171 initAction *nextPtr;
172 initActionEnum action;
Erik Andersen7dc16072000-01-04 01:10:25 +0000173};
Eric Andersen3e6ff902001-03-09 21:24:12 +0000174static initAction *initActionList = NULL;
Erik Andersen7dc16072000-01-04 01:10:25 +0000175
176
Matt Kraai439e3df2001-07-23 14:52:08 +0000177static char *secondConsole = VC_2;
178static char *thirdConsole = VC_3;
179static char *fourthConsole = VC_4;
180static char *log = VC_5;
Erik Andersen42094cd2000-03-20 21:34:52 +0000181static int kernelVersion = 0;
182static char termType[32] = "TERM=linux";
183static char console[32] = _PATH_CONSOLE;
Eric Andersened8a9be2001-11-30 19:10:58 +0000184sig_atomic_t got_cont = 0;
Erik Andersen42094cd2000-03-20 21:34:52 +0000185
Erik Andersene132f4b2000-02-09 04:16:43 +0000186static void delete_initAction(initAction * action);
Eric Andersen0460ff21999-10-25 23:32:44 +0000187
Eric Andersen74400cc2001-10-18 04:11:39 +0000188static void loop_forever(void)
Matt Kraai67a46402001-06-03 05:55:52 +0000189{
190 while (1)
191 sleep (1);
192}
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000193
Erik Andersen42094cd2000-03-20 21:34:52 +0000194/* Print a message to the specified device.
195 * Device may be bitwise-or'd from LOG | CONSOLE */
Eric Andersenfedce062001-11-17 07:27:14 +0000196#ifdef DEBUG_INIT
197static inline messageND(int device, char *fmt, ...) { }
198#else
199#define messageND message
200#endif
Erik Andersen42094cd2000-03-20 21:34:52 +0000201static void message(int device, char *fmt, ...)
Erik Andersen93d65132000-04-06 08:06:36 +0000202 __attribute__ ((format (printf, 2, 3)));
203static void message(int device, char *fmt, ...)
Eric Andersen0460ff21999-10-25 23:32:44 +0000204{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000205 va_list arguments;
206 int fd;
Erik Andersen7dc16072000-01-04 01:10:25 +0000207
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000208#ifdef CONFIG_SYSLOGD
Eric Andersen4c781471999-11-26 08:12:56 +0000209
Erik Andersene49d5ec2000-02-08 19:58:47 +0000210 /* Log the message to syslogd */
211 if (device & LOG) {
212 char msg[1024];
Eric Andersen4c781471999-11-26 08:12:56 +0000213
Erik Andersene49d5ec2000-02-08 19:58:47 +0000214 va_start(arguments, fmt);
215 vsnprintf(msg, sizeof(msg), fmt, arguments);
216 va_end(arguments);
Eric Andersen1644db92001-09-05 20:18:15 +0000217 syslog_msg(LOG_USER, LOG_USER|LOG_INFO, msg);
Eric Andersen3ae0c781999-11-04 01:13:21 +0000218 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000219#else
220 static int log_fd = -1;
221
222 /* Take full control of the log tty, and never close it.
223 * It's mine, all mine! Muhahahaha! */
224 if (log_fd < 0) {
225 if (log == NULL) {
226 /* don't even try to log, because there is no such console */
227 log_fd = -2;
228 /* log to main console instead */
229 device = CONSOLE;
Erik Andersene132f4b2000-02-09 04:16:43 +0000230 } else if ((log_fd = device_open(log, O_RDWR|O_NDELAY)) < 0) {
231 log_fd = -2;
Eric Andersen72f9a422001-10-28 05:12:20 +0000232 fprintf(stderr, "Bummer, can't write to log on %s!\n", log);
Erik Andersene132f4b2000-02-09 04:16:43 +0000233 log = NULL;
234 device = CONSOLE;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000235 }
236 }
237 if ((device & LOG) && (log_fd >= 0)) {
238 va_start(arguments, fmt);
239 vdprintf(log_fd, fmt, arguments);
240 va_end(arguments);
241 }
Eric Andersen4c781471999-11-26 08:12:56 +0000242#endif
243
Erik Andersene49d5ec2000-02-08 19:58:47 +0000244 if (device & CONSOLE) {
245 /* Always send console messages to /dev/console so people will see them. */
246 if (
247 (fd =
248 device_open(_PATH_CONSOLE,
249 O_WRONLY | O_NOCTTY | O_NDELAY)) >= 0) {
250 va_start(arguments, fmt);
251 vdprintf(fd, fmt, arguments);
252 va_end(arguments);
253 close(fd);
254 } else {
255 fprintf(stderr, "Bummer, can't print: ");
256 va_start(arguments, fmt);
257 vfprintf(stderr, fmt, arguments);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000258 va_end(arguments);
259 }
Eric Andersen3ae0c781999-11-04 01:13:21 +0000260 }
Eric Andersencc8ed391999-10-05 16:24:54 +0000261}
262
Eric Andersen0460ff21999-10-25 23:32:44 +0000263/* Set terminal settings to reasonable defaults */
Eric Andersen3e6ff902001-03-09 21:24:12 +0000264static void set_term(int fd)
Eric Andersencc8ed391999-10-05 16:24:54 +0000265{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000266 struct termios tty;
Eric Andersencc8ed391999-10-05 16:24:54 +0000267
Erik Andersene49d5ec2000-02-08 19:58:47 +0000268 tcgetattr(fd, &tty);
Eric Andersencc8ed391999-10-05 16:24:54 +0000269
Erik Andersene49d5ec2000-02-08 19:58:47 +0000270 /* set control chars */
Eric Andersen3849f9b2000-07-10 19:56:47 +0000271 tty.c_cc[VINTR] = 3; /* C-c */
272 tty.c_cc[VQUIT] = 28; /* C-\ */
273 tty.c_cc[VERASE] = 127; /* C-? */
274 tty.c_cc[VKILL] = 21; /* C-u */
275 tty.c_cc[VEOF] = 4; /* C-d */
276 tty.c_cc[VSTART] = 17; /* C-q */
277 tty.c_cc[VSTOP] = 19; /* C-s */
278 tty.c_cc[VSUSP] = 26; /* C-z */
Eric Andersen02bc25b2000-07-06 21:29:32 +0000279
Erik Andersene49d5ec2000-02-08 19:58:47 +0000280 /* use line dicipline 0 */
281 tty.c_line = 0;
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000282
Erik Andersene49d5ec2000-02-08 19:58:47 +0000283 /* Make it be sane */
Erik Andersen6c41c442000-03-19 05:13:49 +0000284 tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD;
Eric Andersend8862922001-04-23 15:14:11 +0000285 tty.c_cflag |= CREAD|HUPCL|CLOCAL;
286
Eric Andersen08b10341999-11-19 02:38:58 +0000287
Erik Andersene49d5ec2000-02-08 19:58:47 +0000288 /* input modes */
289 tty.c_iflag = ICRNL | IXON | IXOFF;
Eric Andersen08b10341999-11-19 02:38:58 +0000290
Erik Andersene49d5ec2000-02-08 19:58:47 +0000291 /* output modes */
292 tty.c_oflag = OPOST | ONLCR;
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000293
Erik Andersene49d5ec2000-02-08 19:58:47 +0000294 /* local modes */
295 tty.c_lflag =
296 ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN;
Eric Andersencc8ed391999-10-05 16:24:54 +0000297
Erik Andersene49d5ec2000-02-08 19:58:47 +0000298 tcsetattr(fd, TCSANOW, &tty);
Eric Andersencc8ed391999-10-05 16:24:54 +0000299}
300
Eric Andersenbc5941a2000-12-06 23:17:37 +0000301/* How much memory does this machine have?
302 Units are kBytes to avoid overflow on 4GB machines */
Eric Andersen74400cc2001-10-18 04:11:39 +0000303static int check_free_memory(void)
Eric Andersencc8ed391999-10-05 16:24:54 +0000304{
Erik Andersend07ee462000-02-21 21:26:32 +0000305 struct sysinfo info;
Eric Andersenbc5941a2000-12-06 23:17:37 +0000306 unsigned int result, u, s=10;
Eric Andersencc8ed391999-10-05 16:24:54 +0000307
Erik Andersend07ee462000-02-21 21:26:32 +0000308 if (sysinfo(&info) != 0) {
Eric Andersen53cfb7e2001-01-31 17:29:47 +0000309 perror_msg("Error checking free memory");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000310 return -1;
Eric Andersenabc7d591999-10-19 00:27:50 +0000311 }
Eric Andersenbc5941a2000-12-06 23:17:37 +0000312
313 /* Kernels 2.0.x and 2.2.x return info.mem_unit==0 with values in bytes.
314 * Kernels 2.4.0 return info.mem_unit in bytes. */
315 u = info.mem_unit;
316 if (u==0) u=1;
317 while ( (u&1) == 0 && s > 0 ) { u>>=1; s--; }
318 result = (info.totalram>>s) + (info.totalswap>>s);
319 result = result*u;
320 if (result < 0) result = INT_MAX;
321 return result;
Eric Andersencc8ed391999-10-05 16:24:54 +0000322}
323
Eric Andersen74400cc2001-10-18 04:11:39 +0000324static void console_init(void)
Eric Andersen0460ff21999-10-25 23:32:44 +0000325{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000326 int fd;
327 int tried_devcons = 0;
328 int tried_vtprimary = 0;
Erik Andersen029011b2000-03-04 21:19:32 +0000329 struct vt_stat vt;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000330 struct serial_struct sr;
331 char *s;
Eric Andersen0460ff21999-10-25 23:32:44 +0000332
Erik Andersene49d5ec2000-02-08 19:58:47 +0000333 if ((s = getenv("TERM")) != NULL) {
334 snprintf(termType, sizeof(termType) - 1, "TERM=%s", s);
335 }
Erik Andersenac6e71f2000-01-08 22:04:33 +0000336
Erik Andersene49d5ec2000-02-08 19:58:47 +0000337 if ((s = getenv("CONSOLE")) != NULL) {
Matt Kraai18447702001-05-18 21:24:58 +0000338 safe_strncpy(console, s, sizeof(console));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000339 }
Eric Andersenfbb39c81999-11-08 17:00:52 +0000340#if #cpu(sparc)
Erik Andersene49d5ec2000-02-08 19:58:47 +0000341 /* sparc kernel supports console=tty[ab] parameter which is also
342 * passed to init, so catch it here */
343 else if ((s = getenv("console")) != NULL) {
344 /* remap tty[ab] to /dev/ttyS[01] */
345 if (strcmp(s, "ttya") == 0)
Matt Kraai439e3df2001-07-23 14:52:08 +0000346 safe_strncpy(console, SC_0, sizeof(console));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000347 else if (strcmp(s, "ttyb") == 0)
Matt Kraai439e3df2001-07-23 14:52:08 +0000348 safe_strncpy(console, SC_1, sizeof(console));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000349 }
Eric Andersen219d6f51999-11-02 19:43:01 +0000350#endif
Erik Andersene49d5ec2000-02-08 19:58:47 +0000351 else {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000352 /* 2.2 kernels: identify the real console backend and try to use it */
353 if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
354 /* this is a serial console */
Matt Kraai439e3df2001-07-23 14:52:08 +0000355 snprintf(console, sizeof(console) - 1, SC_FORMAT, sr.line);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000356 } else if (ioctl(0, VT_GETSTATE, &vt) == 0) {
357 /* this is linux virtual tty */
Matt Kraai439e3df2001-07-23 14:52:08 +0000358 snprintf(console, sizeof(console) - 1, VC_FORMAT, vt.v_active);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000359 } else {
Matt Kraai18447702001-05-18 21:24:58 +0000360 safe_strncpy(console, _PATH_CONSOLE, sizeof(console));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000361 tried_devcons++;
362 }
Eric Andersen07e52971999-11-07 07:38:08 +0000363 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000364
365 while ((fd = open(console, O_RDONLY | O_NONBLOCK)) < 0) {
366 /* Can't open selected console -- try /dev/console */
367 if (!tried_devcons) {
368 tried_devcons++;
Matt Kraai18447702001-05-18 21:24:58 +0000369 safe_strncpy(console, _PATH_CONSOLE, sizeof(console));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000370 continue;
371 }
372 /* Can't open selected console -- try vt1 */
373 if (!tried_vtprimary) {
374 tried_vtprimary++;
Matt Kraai439e3df2001-07-23 14:52:08 +0000375 safe_strncpy(console, VC_1, sizeof(console));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000376 continue;
377 }
378 break;
379 }
380 if (fd < 0) {
381 /* Perhaps we should panic here? */
Matt Kraai18447702001-05-18 21:24:58 +0000382 safe_strncpy(console, "/dev/null", sizeof(console));
Eric Andersen07e52971999-11-07 07:38:08 +0000383 } else {
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000384 /* check for serial console and disable logging to tty5 & running a
385 * shell to tty2-4 */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000386 if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000387 log = NULL;
388 secondConsole = NULL;
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000389 thirdConsole = NULL;
390 fourthConsole = NULL;
Erik Andersenfa4718e2000-02-21 19:25:12 +0000391 /* Force the TERM setting to vt102 for serial console --
392 * iff TERM is set to linux (the default) */
393 if (strcmp( termType, "TERM=linux" ) == 0)
Matt Kraai18447702001-05-18 21:24:58 +0000394 safe_strncpy(termType, "TERM=vt102", sizeof(termType));
Erik Andersene132f4b2000-02-09 04:16:43 +0000395 message(LOG | CONSOLE,
Eric Andersen72f9a422001-10-28 05:12:20 +0000396 "serial console detected. Disabling virtual terminals.\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000397 }
398 close(fd);
Eric Andersen07e52971999-11-07 07:38:08 +0000399 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000400 message(LOG, "console=%s\n", console);
Eric Andersen0460ff21999-10-25 23:32:44 +0000401}
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000402
403static void fixup_argv(int argc, char **argv, char *new_argv0)
404{
405 int len;
406 /* Fix up argv[0] to be certain we claim to be init */
407 len = strlen(argv[0]);
408 memset(argv[0], 0, len);
Eric Andersen72f9a422001-10-28 05:12:20 +0000409 safe_strncpy(argv[0], new_argv0, len + 1);
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000410
411 /* Wipe argv[1]-argv[N] so they don't clutter the ps listing */
412 len = 1;
413 while (argc > len) {
414 memset(argv[len], 0, strlen(argv[len]));
415 len++;
416 }
417}
418
Eric Andersen0460ff21999-10-25 23:32:44 +0000419
Erik Andersene49d5ec2000-02-08 19:58:47 +0000420static pid_t run(char *command, char *terminal, int get_enter)
Eric Andersen0460ff21999-10-25 23:32:44 +0000421{
Eric Andersen7f197852001-03-16 01:14:04 +0000422 int i, j;
Eric Andersen477aedd2001-02-20 18:01:50 +0000423 int fd;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000424 pid_t pid;
Eric Andersen7f197852001-03-16 01:14:04 +0000425 char *tmpCmd, *s;
426 char *cmd[255], *cmdpath;
Erik Andersene132f4b2000-02-09 04:16:43 +0000427 char buf[255];
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000428 struct stat sb;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000429 static const char press_enter[] =
430
Eric Andersen38624232001-01-25 00:04:16 +0000431#ifdef CUSTOMIZED_BANNER
432#include CUSTOMIZED_BANNER
433#endif
434
Erik Andersene49d5ec2000-02-08 19:58:47 +0000435 "\nPlease press Enter to activate this console. ";
Eric Andersen477aedd2001-02-20 18:01:50 +0000436 char *environment[MAXENV+1] = {
Eric Andersen7f197852001-03-16 01:14:04 +0000437 termType,
Erik Andersene49d5ec2000-02-08 19:58:47 +0000438 "HOME=/",
Eric Andersen72f9a422001-10-28 05:12:20 +0000439 "PATH=" _PATH_STDPATH,
Matt Kraai7bd773c2001-06-12 20:55:02 +0000440 "SHELL=" SHELL,
Eric Andersen7f197852001-03-16 01:14:04 +0000441 "USER=root",
442 NULL
Erik Andersene49d5ec2000-02-08 19:58:47 +0000443 };
Erik Andersenac6e71f2000-01-08 22:04:33 +0000444
Eric Andersen7f197852001-03-16 01:14:04 +0000445 /* inherit environment to the child, merging our values -andy */
446 for (i=0; environ[i]; i++) {
447 for (j=0; environment[j]; j++) {
448 s = strchr(environment[j], '=');
449 if (!strncmp(environ[i], environment[j], s - environment[j]))
450 break;
451 }
452 if (!environment[j]) {
453 environment[j++] = environ[i];
454 environment[j] = NULL;
455 }
Eric Andersen477aedd2001-02-20 18:01:50 +0000456 }
457
Eric Andersen72f9a422001-10-28 05:12:20 +0000458#if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__)
459 if ((pid = fork()) == 0)
460#else
461 if ((pid = vfork()) == 0)
462#endif
463 {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000464 /* Clean up */
Eric Andersenfb6a5082000-09-13 16:15:29 +0000465 ioctl(0, TIOCNOTTY, 0);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000466 close(0);
467 close(1);
468 close(2);
469 setsid();
Eric Andersen0460ff21999-10-25 23:32:44 +0000470
Erik Andersene49d5ec2000-02-08 19:58:47 +0000471 /* Reset signal handlers set for parent process */
472 signal(SIGUSR1, SIG_DFL);
473 signal(SIGUSR2, SIG_DFL);
474 signal(SIGINT, SIG_DFL);
475 signal(SIGTERM, SIG_DFL);
476 signal(SIGHUP, SIG_DFL);
Eric Andersened8a9be2001-11-30 19:10:58 +0000477 signal(SIGCONT, SIG_DFL);
478 signal(SIGSTOP, SIG_DFL);
479 signal(SIGTSTP, SIG_DFL);
Eric Andersen2f6c04f1999-11-01 23:59:44 +0000480
Erik Andersene49d5ec2000-02-08 19:58:47 +0000481 if ((fd = device_open(terminal, O_RDWR)) < 0) {
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000482 if (stat(terminal, &sb) != 0) {
Eric Andersen53f50612001-03-14 09:01:11 +0000483 message(LOG | CONSOLE, "device '%s' does not exist.\n",
484 terminal);
485 exit(1);
486 }
Eric Andersen72f9a422001-10-28 05:12:20 +0000487 message(LOG | CONSOLE, "Bummer, can't open %s\n", terminal);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000488 exit(1);
489 }
490 dup2(fd, 0);
491 dup2(fd, 1);
492 dup2(fd, 2);
Eric Andersenfb6a5082000-09-13 16:15:29 +0000493 ioctl(0, TIOCSCTTY, 1);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000494 tcsetpgrp(0, getpgrp());
495 set_term(0);
496
Erik Andersene132f4b2000-02-09 04:16:43 +0000497 /* See if any special /bin/sh requiring characters are present */
498 if (strpbrk(command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
499 cmd[0] = SHELL;
500 cmd[1] = "-c";
501 strcpy(buf, "exec ");
Eric Andersen72f9a422001-10-28 05:12:20 +0000502 safe_strncpy(buf + sizeof("exec "), command,
503 sizeof(buf) - sizeof("exec "));
Erik Andersene132f4b2000-02-09 04:16:43 +0000504 cmd[2] = buf;
505 cmd[3] = NULL;
506 } else {
507 /* Convert command (char*) into cmd (char**, one word per string) */
Eric Andersen72f9a422001-10-28 05:12:20 +0000508 safe_strncpy(buf, command, sizeof(buf));
509 s = buf;
510 for (tmpCmd = buf, i = 0;
511 (tmpCmd = strsep(&s, " \t")) != NULL;) {
Erik Andersene132f4b2000-02-09 04:16:43 +0000512 if (*tmpCmd != '\0') {
513 cmd[i] = tmpCmd;
514 tmpCmd++;
515 i++;
516 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000517 }
Erik Andersene132f4b2000-02-09 04:16:43 +0000518 cmd[i] = NULL;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000519 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000520
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000521 cmdpath = cmd[0];
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000522
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000523 /*
524 Interactive shells want to see a dash in argv[0]. This
525 typically is handled by login, argv will be setup this
526 way if a dash appears at the front of the command path
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000527 (like "-/bin/sh").
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000528 */
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000529
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000530 if (*cmdpath == '-') {
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000531
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000532 /* skip over the dash */
533 ++cmdpath;
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000534
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000535 /* find the last component in the command pathname */
536 s = get_last_path_component(cmdpath);
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000537
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000538 /* make a new argv[0] */
539 if ((cmd[0] = malloc(strlen(s)+2)) == NULL) {
540 message(LOG | CONSOLE, "malloc failed");
541 cmd[0] = cmdpath;
542 } else {
543 cmd[0][0] = '-';
544 strcpy(cmd[0]+1, s);
545 }
546 }
547
548 if (get_enter == TRUE) {
549 /*
550 * Save memory by not exec-ing anything large (like a shell)
551 * before the user wants it. This is critical if swap is not
552 * enabled and the system has low memory. Generally this will
553 * be run on the second virtual console, and the first will
554 * be allowed to start a shell or whatever an init script
555 * specifies.
556 */
Eric Andersenfedce062001-11-17 07:27:14 +0000557 messageND(LOG, "Waiting for enter to start '%s' (pid %d, console %s)\n",
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000558 cmd[0], getpid(), terminal);
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000559 write(fileno(stdout), press_enter, sizeof(press_enter) - 1);
560 getc(stdin);
561 }
562
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000563 /* Log the process name and args */
Eric Andersenfedce062001-11-17 07:27:14 +0000564 messageND(LOG, "Starting pid %d, console %s: '%s'\n",
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000565 getpid(), terminal, command);
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000566
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000567#if defined CONFIG_FEATURE_INIT_COREDUMPS
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000568 if (stat (CORE_ENABLE_FLAG_FILE, &sb) == 0) {
569 struct rlimit limit;
570 limit.rlim_cur = RLIM_INFINITY;
571 limit.rlim_max = RLIM_INFINITY;
572 setrlimit(RLIMIT_CORE, &limit);
Erik Andersen983b51b2000-04-04 18:14:25 +0000573 }
Erik Andersen183da4a2000-04-04 18:36:37 +0000574#endif
Erik Andersen983b51b2000-04-04 18:14:25 +0000575
Erik Andersene49d5ec2000-02-08 19:58:47 +0000576 /* Now run it. The new program will take over this PID,
577 * so nothing further in init.c should be run. */
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000578 execve(cmdpath, cmd, environment);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000579
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000580 /* We're still here? Some error happened. */
581 message(LOG | CONSOLE, "Bummer, could not run '%s': %s\n", cmdpath,
582 strerror(errno));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000583 exit(-1);
Erik Andersen05df2392000-01-13 04:43:48 +0000584 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000585 return pid;
Eric Andersen0460ff21999-10-25 23:32:44 +0000586}
587
Erik Andersene49d5ec2000-02-08 19:58:47 +0000588static int waitfor(char *command, char *terminal, int get_enter)
Erik Andersen0e3782f2000-01-07 02:54:55 +0000589{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000590 int status, wpid;
591 int pid = run(command, terminal, get_enter);
Erik Andersen0e3782f2000-01-07 02:54:55 +0000592
Erik Andersene49d5ec2000-02-08 19:58:47 +0000593 while (1) {
594 wpid = wait(&status);
Erik Andersene132f4b2000-02-09 04:16:43 +0000595 if (wpid > 0 && wpid != pid) {
596 continue;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000597 }
598 if (wpid == pid)
599 break;
Erik Andersen0e3782f2000-01-07 02:54:55 +0000600 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000601 return wpid;
Erik Andersen0e3782f2000-01-07 02:54:55 +0000602}
603
Eric Andersen219d6f51999-11-02 19:43:01 +0000604/* Make sure there is enough memory to do something useful. *
Erik Andersene132f4b2000-02-09 04:16:43 +0000605 * Calls "swapon -a" if needed so be sure /etc/fstab is present... */
Eric Andersen74400cc2001-10-18 04:11:39 +0000606static void check_memory(void)
Eric Andersen219d6f51999-11-02 19:43:01 +0000607{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000608 struct stat statBuf;
Eric Andersen219d6f51999-11-02 19:43:01 +0000609
Erik Andersend07ee462000-02-21 21:26:32 +0000610 if (check_free_memory() > 1000)
Erik Andersene49d5ec2000-02-08 19:58:47 +0000611 return;
612
Eric Andersen72f9a422001-10-28 05:12:20 +0000613#if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__)
Erik Andersene49d5ec2000-02-08 19:58:47 +0000614 if (stat("/etc/fstab", &statBuf) == 0) {
Erik Andersen61677fe2000-04-13 01:18:56 +0000615 /* swapon -a requires /proc typically */
616 waitfor("mount proc /proc -t proc", console, FALSE);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000617 /* Try to turn on swap */
Erik Andersen61677fe2000-04-13 01:18:56 +0000618 waitfor("swapon -a", console, FALSE);
Erik Andersend07ee462000-02-21 21:26:32 +0000619 if (check_free_memory() < 1000)
Erik Andersene49d5ec2000-02-08 19:58:47 +0000620 goto goodnight;
621 } else
622 goto goodnight;
Eric Andersen219d6f51999-11-02 19:43:01 +0000623 return;
Eric Andersen72f9a422001-10-28 05:12:20 +0000624#endif
Eric Andersen219d6f51999-11-02 19:43:01 +0000625
Erik Andersene49d5ec2000-02-08 19:58:47 +0000626 goodnight:
627 message(CONSOLE,
Eric Andersen72f9a422001-10-28 05:12:20 +0000628 "Sorry, your computer does not have enough memory.\n");
Matt Kraai67a46402001-06-03 05:55:52 +0000629 loop_forever();
Eric Andersen219d6f51999-11-02 19:43:01 +0000630}
631
Erik Andersene132f4b2000-02-09 04:16:43 +0000632/* Run all commands to be run right before halt/reboot */
Eric Andersenc97ec342001-04-03 18:01:51 +0000633static void run_actions(initActionEnum action)
Erik Andersene132f4b2000-02-09 04:16:43 +0000634{
Eric Andersen0d4e51d2001-03-15 19:18:21 +0000635 initAction *a, *tmp;
Eric Andersena4edd0e2001-03-15 21:04:18 +0000636 for (a = initActionList; a; a = tmp) {
637 tmp = a->nextPtr;
Eric Andersenc97ec342001-04-03 18:01:51 +0000638 if (a->action == action) {
Erik Andersene132f4b2000-02-09 04:16:43 +0000639 waitfor(a->process, a->console, FALSE);
640 delete_initAction(a);
641 }
642 }
643}
644
645
Erik Andersen7dc16072000-01-04 01:10:25 +0000646#ifndef DEBUG_INIT
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000647static void shutdown_system(void)
Eric Andersencc8ed391999-10-05 16:24:54 +0000648{
Eric Andersen813d88c2001-10-28 22:49:48 +0000649 sigset_t block_signals;
Erik Andersene132f4b2000-02-09 04:16:43 +0000650
Eric Andersen72f9a422001-10-28 05:12:20 +0000651 /* first disable all our signals */
652 sigemptyset(&block_signals);
653 sigaddset(&block_signals, SIGHUP);
654 sigaddset(&block_signals, SIGCHLD);
655 sigaddset(&block_signals, SIGUSR1);
656 sigaddset(&block_signals, SIGUSR2);
657 sigaddset(&block_signals, SIGINT);
658 sigaddset(&block_signals, SIGTERM);
Eric Andersened8a9be2001-11-30 19:10:58 +0000659 sigaddset(&block_signals, SIGCONT);
660 sigaddset(&block_signals, SIGSTOP);
661 sigaddset(&block_signals, SIGTSTP);
Eric Andersen72f9a422001-10-28 05:12:20 +0000662 sigprocmask(SIG_BLOCK, &block_signals, NULL);
Erik Andersen7dc16072000-01-04 01:10:25 +0000663
Erik Andersene49d5ec2000-02-08 19:58:47 +0000664 /* Allow Ctrl-Alt-Del to reboot system. */
Erik Andersen4f3f7572000-04-28 00:18:56 +0000665 init_reboot(RB_ENABLE_CAD);
Erik Andersene132f4b2000-02-09 04:16:43 +0000666
Eric Andersen72f9a422001-10-28 05:12:20 +0000667 message(CONSOLE|LOG, "\nThe system is going down NOW !!\n");
Eric Andersencf8c9cf1999-11-05 00:31:46 +0000668 sync();
Erik Andersene49d5ec2000-02-08 19:58:47 +0000669
670 /* Send signals to every process _except_ pid 1 */
Eric Andersen72f9a422001-10-28 05:12:20 +0000671 message(CONSOLE|LOG, "Sending SIGTERM to all processes.\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000672 kill(-1, SIGTERM);
Erik Andersene132f4b2000-02-09 04:16:43 +0000673 sleep(1);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000674 sync();
675
Eric Andersen72f9a422001-10-28 05:12:20 +0000676 message(CONSOLE|LOG, "Sending SIGKILL to all processes.\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000677 kill(-1, SIGKILL);
Erik Andersene132f4b2000-02-09 04:16:43 +0000678 sleep(1);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000679
Matt Kraai8fc364e2001-04-12 20:12:16 +0000680 /* run everything to be run at "shutdown" */
Eric Andersenc97ec342001-04-03 18:01:51 +0000681 run_actions(SHUTDOWN);
Erik Andersene132f4b2000-02-09 04:16:43 +0000682
Erik Andersene49d5ec2000-02-08 19:58:47 +0000683 sync();
Eric Andersenbd22ed82000-07-08 18:55:24 +0000684 if (kernelVersion > 0 && kernelVersion <= KERNEL_VERSION(2,2,11)) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000685 /* bdflush, kupdate not needed for kernels >2.2.11 */
686 bdflush(1, 0);
687 sync();
688 }
Eric Andersencc8ed391999-10-05 16:24:54 +0000689}
690
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000691static void halt_signal(int sig)
Eric Andersencc8ed391999-10-05 16:24:54 +0000692{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000693 shutdown_system();
Erik Andersene132f4b2000-02-09 04:16:43 +0000694 message(CONSOLE|LOG,
Eric Andersenf435a912001-11-20 05:42:57 +0000695#if #cpu(s390)
696 /* Seems the s390 console is Wierd(tm). */
Eric Andersen2480e3a2001-11-21 09:05:31 +0000697 "The system is halted. You may reboot now.\n"
Eric Andersenf435a912001-11-20 05:42:57 +0000698#else
699 /* secondConsole is NULL for a serial console */
Eric Andersen72f9a422001-10-28 05:12:20 +0000700 "The system is halted. Press %s or turn off power\n",
Eric Andersenf435a912001-11-20 05:42:57 +0000701 (secondConsole == NULL)? "Reset" : "CTRL-ALT-DEL"
702#endif
703 );
Erik Andersene49d5ec2000-02-08 19:58:47 +0000704 sync();
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000705
Erik Andersene49d5ec2000-02-08 19:58:47 +0000706 /* allow time for last message to reach serial console */
Erik Andersene132f4b2000-02-09 04:16:43 +0000707 sleep(2);
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000708
Eric Andersenbd22ed82000-07-08 18:55:24 +0000709 if (sig == SIGUSR2 && kernelVersion >= KERNEL_VERSION(2,2,0))
Erik Andersen4f3f7572000-04-28 00:18:56 +0000710 init_reboot(RB_POWER_OFF);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000711 else
Erik Andersen4f3f7572000-04-28 00:18:56 +0000712 init_reboot(RB_HALT_SYSTEM);
Matt Kraai67a46402001-06-03 05:55:52 +0000713
714 loop_forever();
Eric Andersencc8ed391999-10-05 16:24:54 +0000715}
716
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000717static void reboot_signal(int sig)
Eric Andersencc8ed391999-10-05 16:24:54 +0000718{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000719 shutdown_system();
Eric Andersen72f9a422001-10-28 05:12:20 +0000720 message(CONSOLE|LOG, "Please stand by while rebooting the system.\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000721 sync();
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000722
Erik Andersene49d5ec2000-02-08 19:58:47 +0000723 /* allow time for last message to reach serial console */
724 sleep(2);
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000725
Erik Andersen4f3f7572000-04-28 00:18:56 +0000726 init_reboot(RB_AUTOBOOT);
Matt Kraai67a46402001-06-03 05:55:52 +0000727
728 loop_forever();
Eric Andersencc8ed391999-10-05 16:24:54 +0000729}
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000730
Eric Andersenc97ec342001-04-03 18:01:51 +0000731static void ctrlaltdel_signal(int sig)
732{
733 run_actions(CTRLALTDEL);
734}
735
Eric Andersened8a9be2001-11-30 19:10:58 +0000736/*
737 * The SIGSTOP & SIGTSTP handler
738 */
739static void stop_handler(int sig)
740{
741 int saved_errno = errno;
742
743 got_cont = 0;
744 while(!got_cont) pause();
745 got_cont = 0;
746 errno = saved_errno;
747}
748
749/*
750 * The SIGCONT handler
751 */
752static void cont_handler(int sig)
753{
754 got_cont = 1;
755}
756
Erik Andersene49d5ec2000-02-08 19:58:47 +0000757#endif /* ! DEBUG_INIT */
Erik Andersende552872000-01-23 01:34:05 +0000758
Eric Andersen3e6ff902001-03-09 21:24:12 +0000759static void new_initAction(initActionEnum action, char *process, char *cons)
Erik Andersen7dc16072000-01-04 01:10:25 +0000760{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000761 initAction *newAction;
Eric Andersen1644db92001-09-05 20:18:15 +0000762 initAction *a;
Erik Andersen9e737252000-01-06 01:16:13 +0000763
Erik Andersene49d5ec2000-02-08 19:58:47 +0000764 if (*cons == '\0')
765 cons = console;
Erik Andersen9e737252000-01-06 01:16:13 +0000766
Erik Andersene49d5ec2000-02-08 19:58:47 +0000767 /* If BusyBox detects that a serial console is in use,
768 * then entries not refering to the console or null devices will _not_ be run.
769 * The exception to this rule is the null device.
770 */
771 if (secondConsole == NULL && strcmp(cons, console)
772 && strcmp(cons, "/dev/null"))
773 return;
Eric Andersen1644db92001-09-05 20:18:15 +0000774 if (strcmp(cons, "/dev/null") == 0 && action == ASKFIRST)
775 return;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000776
777 newAction = calloc((size_t) (1), sizeof(initAction));
778 if (!newAction) {
779 message(LOG | CONSOLE, "Memory allocation failure\n");
Matt Kraai67a46402001-06-03 05:55:52 +0000780 loop_forever();
Erik Andersene49d5ec2000-02-08 19:58:47 +0000781 }
Eric Andersen1644db92001-09-05 20:18:15 +0000782 for (a = initActionList; a && a->nextPtr; a = a->nextPtr) ;
783 if (a) {
784 a->nextPtr = newAction;
785 } else {
786 initActionList = newAction;
787 }
Eric Andersen72f9a422001-10-28 05:12:20 +0000788 safe_strncpy(newAction->process, process, 255);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000789 newAction->action = action;
Eric Andersen72f9a422001-10-28 05:12:20 +0000790 safe_strncpy(newAction->console, cons, 255);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000791 newAction->pid = 0;
Erik Andersen31638212000-01-15 22:28:50 +0000792// message(LOG|CONSOLE, "process='%s' action='%d' console='%s'\n",
Erik Andersene49d5ec2000-02-08 19:58:47 +0000793// newAction->process, newAction->action, newAction->console);
Erik Andersen7dc16072000-01-04 01:10:25 +0000794}
795
Erik Andersene132f4b2000-02-09 04:16:43 +0000796static void delete_initAction(initAction * action)
Erik Andersen7dc16072000-01-04 01:10:25 +0000797{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000798 initAction *a, *b = NULL;
799
800 for (a = initActionList; a; b = a, a = a->nextPtr) {
801 if (a == action) {
802 if (b == NULL) {
803 initActionList = a->nextPtr;
804 } else {
805 b->nextPtr = a->nextPtr;
806 }
807 free(a);
808 break;
809 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000810 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000811}
812
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000813/* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined,
Erik Andersen9e737252000-01-06 01:16:13 +0000814 * then parse_inittab() simply adds in some default
Eric Andersen77d92682001-05-23 20:32:09 +0000815 * actions(i.e., runs INIT_SCRIPT and then starts a pair
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000816 * of "askfirst" shells). If CONFIG_FEATURE_USE_INITTAB
Erik Andersen812d4662000-01-07 18:30:40 +0000817 * _is_ defined, but /etc/inittab is missing, this
818 * results in the same set of default behaviors.
Erik Andersen9e737252000-01-06 01:16:13 +0000819 * */
Eric Andersen3e6ff902001-03-09 21:24:12 +0000820static void parse_inittab(void)
Erik Andersen7dc16072000-01-04 01:10:25 +0000821{
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000822#ifdef CONFIG_FEATURE_USE_INITTAB
Erik Andersene49d5ec2000-02-08 19:58:47 +0000823 FILE *file;
824 char buf[256], lineAsRead[256], tmpConsole[256];
Eric Andersenb5966362000-05-31 20:04:38 +0000825 char *id, *runlev, *action, *process, *eol;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000826 const struct initActionType *a = actions;
827 int foundIt;
Erik Andersen7dc16072000-01-04 01:10:25 +0000828
829
Erik Andersene49d5ec2000-02-08 19:58:47 +0000830 file = fopen(INITTAB, "r");
831 if (file == NULL) {
832 /* No inittab file -- set up some default behavior */
Erik Andersen9e737252000-01-06 01:16:13 +0000833#endif
Eric Andersenc97ec342001-04-03 18:01:51 +0000834 /* Reboot on Ctrl-Alt-Del */
835 new_initAction(CTRLALTDEL, "/sbin/reboot", console);
Eric Andersen1644db92001-09-05 20:18:15 +0000836 /* Umount all filesystems on halt/reboot */
837 new_initAction(SHUTDOWN, "/bin/umount -a -r", console);
Eric Andersen72f9a422001-10-28 05:12:20 +0000838#if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__)
Eric Andersen1644db92001-09-05 20:18:15 +0000839 /* Swapoff on halt/reboot */
840 new_initAction(SHUTDOWN, "/sbin/swapoff -a", console);
Eric Andersen1644db92001-09-05 20:18:15 +0000841#endif
Erik Andersene49d5ec2000-02-08 19:58:47 +0000842 /* Askfirst shell on tty1 */
Matt Kraai7bd773c2001-06-12 20:55:02 +0000843 new_initAction(ASKFIRST, LOGIN_SHELL, console);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000844 /* Askfirst shell on tty2 */
845 if (secondConsole != NULL)
Matt Kraai7bd773c2001-06-12 20:55:02 +0000846 new_initAction(ASKFIRST, LOGIN_SHELL, secondConsole);
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000847 /* Askfirst shell on tty3 */
848 if (thirdConsole != NULL)
Matt Kraai7bd773c2001-06-12 20:55:02 +0000849 new_initAction(ASKFIRST, LOGIN_SHELL, thirdConsole);
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000850 /* Askfirst shell on tty4 */
851 if (fourthConsole != NULL)
Matt Kraai7bd773c2001-06-12 20:55:02 +0000852 new_initAction(ASKFIRST, LOGIN_SHELL, fourthConsole);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000853 /* sysinit */
854 new_initAction(SYSINIT, INIT_SCRIPT, console);
Erik Andersen7dc16072000-01-04 01:10:25 +0000855
Erik Andersene49d5ec2000-02-08 19:58:47 +0000856 return;
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000857#ifdef CONFIG_FEATURE_USE_INITTAB
Erik Andersen9e737252000-01-06 01:16:13 +0000858 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000859
Erik Andersene49d5ec2000-02-08 19:58:47 +0000860 while (fgets(buf, 255, file) != NULL) {
861 foundIt = FALSE;
Eric Andersenb5966362000-05-31 20:04:38 +0000862 /* Skip leading spaces */
863 for (id = buf; *id == ' ' || *id == '\t'; id++);
864
865 /* Skip the line if it's a comment */
866 if (*id == '#' || *id == '\n')
Erik Andersene49d5ec2000-02-08 19:58:47 +0000867 continue;
Erik Andersen7dc16072000-01-04 01:10:25 +0000868
Erik Andersene49d5ec2000-02-08 19:58:47 +0000869 /* Trim the trailing \n */
Eric Andersenb5966362000-05-31 20:04:38 +0000870 eol = strrchr(id, '\n');
871 if (eol != NULL)
872 *eol = '\0';
Erik Andersen7dc16072000-01-04 01:10:25 +0000873
Erik Andersene49d5ec2000-02-08 19:58:47 +0000874 /* Keep a copy around for posterity's sake (and error msgs) */
875 strcpy(lineAsRead, buf);
876
Eric Andersenb5966362000-05-31 20:04:38 +0000877 /* Separate the ID field from the runlevels */
878 runlev = strchr(id, ':');
879 if (runlev == NULL || *(runlev + 1) == '\0') {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000880 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
881 continue;
882 } else {
Eric Andersenb5966362000-05-31 20:04:38 +0000883 *runlev = '\0';
884 ++runlev;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000885 }
886
Eric Andersenb5966362000-05-31 20:04:38 +0000887 /* Separate the runlevels from the action */
888 action = strchr(runlev, ':');
889 if (action == NULL || *(action + 1) == '\0') {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000890 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
891 continue;
892 } else {
Eric Andersenb5966362000-05-31 20:04:38 +0000893 *action = '\0';
894 ++action;
895 }
896
897 /* Separate the action from the process */
898 process = strchr(action, ':');
899 if (process == NULL || *(process + 1) == '\0') {
900 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
901 continue;
902 } else {
903 *process = '\0';
904 ++process;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000905 }
906
907 /* Ok, now process it */
908 a = actions;
909 while (a->name != 0) {
Eric Andersenb5966362000-05-31 20:04:38 +0000910 if (strcmp(a->name, action) == 0) {
911 if (*id != '\0') {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000912 strcpy(tmpConsole, "/dev/");
Eric Andersenb5966362000-05-31 20:04:38 +0000913 strncat(tmpConsole, id, 200);
Eric Andersenb5966362000-05-31 20:04:38 +0000914 id = tmpConsole;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000915 }
Eric Andersenb5966362000-05-31 20:04:38 +0000916 new_initAction(a->action, process, id);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000917 foundIt = TRUE;
918 }
919 a++;
920 }
921 if (foundIt == TRUE)
922 continue;
923 else {
924 /* Choke on an unknown action */
925 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
926 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000927 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000928 return;
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000929#endif /* CONFIG_FEATURE_USE_INITTAB */
Erik Andersen7dc16072000-01-04 01:10:25 +0000930}
931
Erik Andersene132f4b2000-02-09 04:16:43 +0000932
933
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000934extern int init_main(int argc, char **argv)
Eric Andersen0460ff21999-10-25 23:32:44 +0000935{
Eric Andersen0d4e51d2001-03-15 19:18:21 +0000936 initAction *a, *tmp;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000937 pid_t wpid;
938 int status;
Eric Andersen0460ff21999-10-25 23:32:44 +0000939
Eric Andersend73dc5b1999-11-10 23:13:02 +0000940#ifndef DEBUG_INIT
Erik Andersena51ecdd2000-02-24 18:09:58 +0000941 /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
942 if (getpid() != 1
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000943#ifdef CONFIG_FEATURE_INITRD
Matt Kraaie58771e2000-07-12 15:38:49 +0000944 && strstr(applet_name, "linuxrc") == NULL
Erik Andersena51ecdd2000-02-24 18:09:58 +0000945#endif
946 )
947 {
Eric Andersen67991cf2001-02-14 21:23:06 +0000948 show_usage();
Erik Andersene49d5ec2000-02-08 19:58:47 +0000949 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000950 /* Set up sig handlers -- be sure to
951 * clear all of these in run() */
952 signal(SIGUSR1, halt_signal);
Eric Andersen4c95a282000-07-07 19:30:28 +0000953 signal(SIGUSR2, halt_signal);
Eric Andersenc97ec342001-04-03 18:01:51 +0000954 signal(SIGINT, ctrlaltdel_signal);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000955 signal(SIGTERM, reboot_signal);
Eric Andersened8a9be2001-11-30 19:10:58 +0000956 signal(SIGCONT, cont_handler);
957 signal(SIGSTOP, stop_handler);
958 signal(SIGTSTP, stop_handler);
Eric Andersen0460ff21999-10-25 23:32:44 +0000959
Erik Andersene49d5ec2000-02-08 19:58:47 +0000960 /* Turn off rebooting via CTL-ALT-DEL -- we get a
961 * SIGINT on CAD so we can shut things down gracefully... */
Erik Andersen4f3f7572000-04-28 00:18:56 +0000962 init_reboot(RB_DISABLE_CAD);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000963#endif
Erik Andersen05df2392000-01-13 04:43:48 +0000964
Erik Andersen298854f2000-03-23 01:09:18 +0000965 /* Figure out what kernel this is running */
966 kernelVersion = get_kernel_revision();
967
Erik Andersene49d5ec2000-02-08 19:58:47 +0000968 /* Close whatever files are open, and reset the console. */
969 close(0);
970 close(1);
971 close(2);
Eric Andersen72f9a422001-10-28 05:12:20 +0000972
973 /* Figure out where the default console should be */
974 console_init();
975
Erik Andersene49d5ec2000-02-08 19:58:47 +0000976 set_term(0);
Erik Andersen983b51b2000-04-04 18:14:25 +0000977 chdir("/");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000978 setsid();
Eric Andersencc8ed391999-10-05 16:24:54 +0000979
Erik Andersene49d5ec2000-02-08 19:58:47 +0000980 /* Make sure PATH is set to something sane */
Eric Andersen452fd332001-03-04 06:47:33 +0000981 putenv("PATH="_PATH_STDPATH);
Eric Andersencc8ed391999-10-05 16:24:54 +0000982
Erik Andersene49d5ec2000-02-08 19:58:47 +0000983 /* Hello world */
Eric Andersenfedce062001-11-17 07:27:14 +0000984 message(MAYBE_CONSOLE|LOG, "init started: %s\n", full_version);
Eric Andersencc8ed391999-10-05 16:24:54 +0000985
Erik Andersene49d5ec2000-02-08 19:58:47 +0000986 /* Make sure there is enough memory to do something useful. */
987 check_memory();
Erik Andersen9e737252000-01-06 01:16:13 +0000988
Erik Andersene49d5ec2000-02-08 19:58:47 +0000989 /* Check if we are supposed to be in single user mode */
990 if (argc > 1 && (!strcmp(argv[1], "single") ||
991 !strcmp(argv[1], "-s") || !strcmp(argv[1], "1"))) {
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000992 /* Ask first then start a shell on tty2-4 */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000993 if (secondConsole != NULL)
Matt Kraai7bd773c2001-06-12 20:55:02 +0000994 new_initAction(ASKFIRST, LOGIN_SHELL, secondConsole);
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000995 if (thirdConsole != NULL)
Matt Kraai7bd773c2001-06-12 20:55:02 +0000996 new_initAction(ASKFIRST, LOGIN_SHELL, thirdConsole);
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000997 if (fourthConsole != NULL)
Matt Kraai7bd773c2001-06-12 20:55:02 +0000998 new_initAction(ASKFIRST, LOGIN_SHELL, fourthConsole);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000999 /* Start a shell on tty1 */
Matt Kraai7bd773c2001-06-12 20:55:02 +00001000 new_initAction(RESPAWN, LOGIN_SHELL, console);
Erik Andersene49d5ec2000-02-08 19:58:47 +00001001 } else {
1002 /* Not in single user mode -- see what inittab says */
Eric Andersen8a8fbb81999-10-26 00:18:56 +00001003
Eric Andersenbdfd0d72001-10-24 05:00:29 +00001004 /* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined,
Erik Andersene49d5ec2000-02-08 19:58:47 +00001005 * then parse_inittab() simply adds in some default
Eric Andersen77d92682001-05-23 20:32:09 +00001006 * actions(i.e., runs INIT_SCRIPT and then starts a pair
Erik Andersene49d5ec2000-02-08 19:58:47 +00001007 * of "askfirst" shells */
1008 parse_inittab();
Eric Andersend00c2621999-12-07 08:37:31 +00001009 }
Erik Andersen983b51b2000-04-04 18:14:25 +00001010
Eric Andersen7ef1a5b2001-03-20 17:39:08 +00001011 /* Make the command line just say "init" -- thats all, nothing else */
1012 fixup_argv(argc, argv, "init");
Eric Andersen219d6f51999-11-02 19:43:01 +00001013
Erik Andersene49d5ec2000-02-08 19:58:47 +00001014 /* Now run everything that needs to be run */
1015
1016 /* First run the sysinit command */
Eric Andersen1644db92001-09-05 20:18:15 +00001017 run_actions(SYSINIT);
Erik Andersene49d5ec2000-02-08 19:58:47 +00001018 /* Next run anything that wants to block */
Eric Andersen1644db92001-09-05 20:18:15 +00001019 run_actions(WAIT);
Erik Andersene49d5ec2000-02-08 19:58:47 +00001020 /* Next run anything to be run only once */
Eric Andersena4edd0e2001-03-15 21:04:18 +00001021 for (a = initActionList; a; a = tmp) {
1022 tmp = a->nextPtr;
Erik Andersene49d5ec2000-02-08 19:58:47 +00001023 if (a->action == ONCE) {
1024 run(a->process, a->console, FALSE);
1025 /* Now remove the "once" entry from the list */
1026 delete_initAction(a);
1027 }
1028 }
1029 /* If there is nothing else to do, stop */
1030 if (initActionList == NULL) {
1031 message(LOG | CONSOLE,
1032 "No more tasks for init -- sleeping forever.\n");
Matt Kraai67a46402001-06-03 05:55:52 +00001033 loop_forever();
Erik Andersene49d5ec2000-02-08 19:58:47 +00001034 }
1035
1036 /* Now run the looping stuff for the rest of forever */
1037 while (1) {
1038 for (a = initActionList; a; a = a->nextPtr) {
1039 /* Only run stuff with pid==0. If they have
1040 * a pid, that means they are still running */
1041 if (a->pid == 0) {
1042 switch (a->action) {
1043 case RESPAWN:
1044 /* run the respawn stuff */
1045 a->pid = run(a->process, a->console, FALSE);
1046 break;
1047 case ASKFIRST:
1048 /* run the askfirst stuff */
1049 a->pid = run(a->process, a->console, TRUE);
1050 break;
1051 /* silence the compiler's incessant whining */
1052 default:
1053 break;
1054 }
1055 }
1056 }
1057 /* Wait for a child process to exit */
1058 wpid = wait(&status);
1059 if (wpid > 0) {
1060 /* Find out who died and clean up their corpse */
1061 for (a = initActionList; a; a = a->nextPtr) {
1062 if (a->pid == wpid) {
1063 a->pid = 0;
Eric Andersenfedce062001-11-17 07:27:14 +00001064 message(LOG, "Process '%s' (pid %d) exited. Scheduling it for restart.\n",
Erik Andersene49d5ec2000-02-08 19:58:47 +00001065 a->process, wpid);
1066 }
1067 }
1068 }
1069 sleep(1);
1070 }
Eric Andersencc8ed391999-10-05 16:24:54 +00001071}
Erik Andersen029011b2000-03-04 21:19:32 +00001072
1073/*
1074Local Variables:
1075c-file-style: "linux"
1076c-basic-offset: 4
1077tab-width: 4
1078End:
1079*/