blob: e057caa7e6b0d304441400b4d1dbd44ded910cb2 [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"
Erik Andersen4f3f7572000-04-28 00:18:56 +000046#ifdef BB_SYSLOGD
47# include <sys/syslog.h>
48#endif
49
Pavel Roskin9c5fcc32000-07-17 23:45:12 +000050
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
Erik Andersen4f3f7572000-04-28 00:18:56 +000078
79#ifndef RB_HALT_SYSTEM
Mark Whitley59ab0252001-01-23 22:30:04 +000080static const int RB_HALT_SYSTEM = 0xcdef0123;
81static const int RB_ENABLE_CAD = 0x89abcdef;
82static const int RB_DISABLE_CAD = 0;
Erik Andersen4f3f7572000-04-28 00:18:56 +000083#define RB_POWER_OFF 0x4321fedc
Mark Whitley59ab0252001-01-23 22:30:04 +000084static const int RB_AUTOBOOT = 0x01234567;
Eric Andersen2f2da902001-04-09 23:54:15 +000085#endif
Eric Andersenb6b519b2001-04-09 23:52:18 +000086
87#if __GNU_LIBRARY__ > 5
88 #include <sys/reboot.h>
Erik Andersen4f3f7572000-04-28 00:18:56 +000089 #define init_reboot(magic) reboot(magic)
90#else
91 #define init_reboot(magic) reboot(0xfee1dead, 672274793, magic)
92#endif
Erik Andersen4f3f7572000-04-28 00:18:56 +000093
Eric Andersen41492d62001-02-23 00:05:56 +000094#ifndef _PATH_STDPATH
Erik Andersen4f3f7572000-04-28 00:18:56 +000095#define _PATH_STDPATH "/usr/bin:/bin:/usr/sbin:/sbin"
Eric Andersen41492d62001-02-23 00:05:56 +000096#endif
Eric Andersencc8ed391999-10-05 16:24:54 +000097
Erik Andersen983b51b2000-04-04 18:14:25 +000098
Erik Andersen183da4a2000-04-04 18:36:37 +000099#if defined BB_FEATURE_INIT_COREDUMPS
Erik Andersen983b51b2000-04-04 18:14:25 +0000100/*
Erik Andersen183da4a2000-04-04 18:36:37 +0000101 * When a file named CORE_ENABLE_FLAG_FILE exists, setrlimit is called
102 * before processes are spawned to set core file size as unlimited.
103 * This is for debugging only. Don't use this is production, unless
104 * you want core dumps lying about....
Erik Andersen983b51b2000-04-04 18:14:25 +0000105 */
106#define CORE_ENABLE_FLAG_FILE "/.init_enable_core"
107#include <sys/resource.h>
108#include <sys/time.h>
Erik Andersen183da4a2000-04-04 18:36:37 +0000109#endif
Erik Andersen983b51b2000-04-04 18:14:25 +0000110
Erik Andersen4d1d0111999-12-17 18:44:15 +0000111#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
Erik Andersen4d1d0111999-12-17 18:44:15 +0000112
Eric Andersenb6b519b2001-04-09 23:52:18 +0000113#if __GNU_LIBRARY__ > 5
114 #include <sys/kdaemon.h>
Erik Andersen4f3f7572000-04-28 00:18:56 +0000115#else
Eric Andersenb6b519b2001-04-09 23:52:18 +0000116 extern int bdflush (int func, long int data);
117#endif
Erik Andersen4f3f7572000-04-28 00:18:56 +0000118
Eric Andersen0ecb54a1999-12-05 23:24:55 +0000119
Erik Andersen42094cd2000-03-20 21:34:52 +0000120#define VT_PRIMARY "/dev/tty1" /* Primary virtual console */
121#define VT_SECONDARY "/dev/tty2" /* Virtual console */
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000122#define VT_THIRD "/dev/tty3" /* Virtual console */
123#define VT_FOURTH "/dev/tty4" /* Virtual console */
124#define VT_LOG "/dev/tty5" /* Virtual console */
Erik Andersen42094cd2000-03-20 21:34:52 +0000125#define SERIAL_CON0 "/dev/ttyS0" /* Primary serial console */
126#define SERIAL_CON1 "/dev/ttyS1" /* Serial console */
Matt Kraai7bd773c2001-06-12 20:55:02 +0000127#define SHELL "/bin/sh" /* Default shell */
128#define LOGIN_SHELL "-" SHELL /* Default login shell */
Erik Andersen42094cd2000-03-20 21:34:52 +0000129#define INITTAB "/etc/inittab" /* inittab file location */
Erik Andersen96e2abd2000-01-07 11:40:44 +0000130#ifndef INIT_SCRIPT
Erik Andersen42094cd2000-03-20 21:34:52 +0000131#define INIT_SCRIPT "/etc/init.d/rcS" /* Default sysinit script. */
Erik Andersen96e2abd2000-01-07 11:40:44 +0000132#endif
Erik Andersen9c88cac1999-12-30 09:25:17 +0000133
Eric Andersen41492d62001-02-23 00:05:56 +0000134#define MAXENV 16 /* Number of env. vars */
135//static const int MAXENV = 16; /* Number of env. vars */
Mark Whitley59ab0252001-01-23 22:30:04 +0000136static const int LOG = 0x1;
137static const int CONSOLE = 0x2;
Erik Andersen7dc16072000-01-04 01:10:25 +0000138
139/* Allowed init action types */
140typedef enum {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000141 SYSINIT = 1,
142 RESPAWN,
143 ASKFIRST,
144 WAIT,
Erik Andersene132f4b2000-02-09 04:16:43 +0000145 ONCE,
Eric Andersenc97ec342001-04-03 18:01:51 +0000146 CTRLALTDEL,
147 SHUTDOWN
Erik Andersen7dc16072000-01-04 01:10:25 +0000148} initActionEnum;
149
Erik Andersen42094cd2000-03-20 21:34:52 +0000150/* A mapping between "inittab" action name strings and action type codes. */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000151typedef struct initActionType {
152 const char *name;
153 initActionEnum action;
Erik Andersen7dc16072000-01-04 01:10:25 +0000154} initActionType;
155
156static const struct initActionType actions[] = {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000157 {"sysinit", SYSINIT},
158 {"respawn", RESPAWN},
159 {"askfirst", ASKFIRST},
160 {"wait", WAIT},
161 {"once", ONCE},
Erik Andersene132f4b2000-02-09 04:16:43 +0000162 {"ctrlaltdel", CTRLALTDEL},
Eric Andersenc97ec342001-04-03 18:01:51 +0000163 {"shutdown", SHUTDOWN},
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
Erik Andersenac6e71f2000-01-08 22:04:33 +0000179static char *secondConsole = VT_SECONDARY;
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000180static char *thirdConsole = VT_THIRD;
181static char *fourthConsole = VT_FOURTH;
Erik Andersen42094cd2000-03-20 21:34:52 +0000182static char *log = VT_LOG;
183static int kernelVersion = 0;
184static char termType[32] = "TERM=linux";
185static char console[32] = _PATH_CONSOLE;
186
Erik Andersene132f4b2000-02-09 04:16:43 +0000187static void delete_initAction(initAction * action);
Eric Andersen0460ff21999-10-25 23:32:44 +0000188
Matt Kraai67a46402001-06-03 05:55:52 +0000189static void loop_forever()
190{
191 while (1)
192 sleep (1);
193}
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000194
Erik Andersen42094cd2000-03-20 21:34:52 +0000195/* Print a message to the specified device.
196 * Device may be bitwise-or'd from LOG | CONSOLE */
197static void message(int device, char *fmt, ...)
Erik Andersen93d65132000-04-06 08:06:36 +0000198 __attribute__ ((format (printf, 2, 3)));
199static void message(int device, char *fmt, ...)
Eric Andersen0460ff21999-10-25 23:32:44 +0000200{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000201 va_list arguments;
202 int fd;
Erik Andersen7dc16072000-01-04 01:10:25 +0000203
Eric Andersen4c781471999-11-26 08:12:56 +0000204#ifdef BB_SYSLOGD
205
Erik Andersene49d5ec2000-02-08 19:58:47 +0000206 /* Log the message to syslogd */
207 if (device & LOG) {
208 char msg[1024];
Eric Andersen4c781471999-11-26 08:12:56 +0000209
Erik Andersene49d5ec2000-02-08 19:58:47 +0000210 va_start(arguments, fmt);
211 vsnprintf(msg, sizeof(msg), fmt, arguments);
212 va_end(arguments);
Eric Andersen53cfb7e2001-01-31 17:29:47 +0000213 openlog(applet_name, 0, LOG_USER);
Erik Andersene132f4b2000-02-09 04:16:43 +0000214 syslog(LOG_USER|LOG_INFO, msg);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000215 closelog();
Eric Andersen3ae0c781999-11-04 01:13:21 +0000216 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000217#else
218 static int log_fd = -1;
219
220 /* Take full control of the log tty, and never close it.
221 * It's mine, all mine! Muhahahaha! */
222 if (log_fd < 0) {
223 if (log == NULL) {
224 /* don't even try to log, because there is no such console */
225 log_fd = -2;
226 /* log to main console instead */
227 device = CONSOLE;
Erik Andersene132f4b2000-02-09 04:16:43 +0000228 } else if ((log_fd = device_open(log, O_RDWR|O_NDELAY)) < 0) {
229 log_fd = -2;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000230 fprintf(stderr, "Bummer, can't write to log on %s!\r\n", log);
Erik Andersene132f4b2000-02-09 04:16:43 +0000231 log = NULL;
232 device = CONSOLE;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000233 }
234 }
235 if ((device & LOG) && (log_fd >= 0)) {
236 va_start(arguments, fmt);
237 vdprintf(log_fd, fmt, arguments);
238 va_end(arguments);
239 }
Eric Andersen4c781471999-11-26 08:12:56 +0000240#endif
241
Erik Andersene49d5ec2000-02-08 19:58:47 +0000242 if (device & CONSOLE) {
243 /* Always send console messages to /dev/console so people will see them. */
244 if (
245 (fd =
246 device_open(_PATH_CONSOLE,
247 O_WRONLY | O_NOCTTY | O_NDELAY)) >= 0) {
248 va_start(arguments, fmt);
249 vdprintf(fd, fmt, arguments);
250 va_end(arguments);
251 close(fd);
252 } else {
253 fprintf(stderr, "Bummer, can't print: ");
254 va_start(arguments, fmt);
255 vfprintf(stderr, fmt, arguments);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000256 va_end(arguments);
257 }
Eric Andersen3ae0c781999-11-04 01:13:21 +0000258 }
Eric Andersencc8ed391999-10-05 16:24:54 +0000259}
260
Eric Andersen0460ff21999-10-25 23:32:44 +0000261/* Set terminal settings to reasonable defaults */
Eric Andersen3e6ff902001-03-09 21:24:12 +0000262static void set_term(int fd)
Eric Andersencc8ed391999-10-05 16:24:54 +0000263{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000264 struct termios tty;
Eric Andersencc8ed391999-10-05 16:24:54 +0000265
Erik Andersene49d5ec2000-02-08 19:58:47 +0000266 tcgetattr(fd, &tty);
Eric Andersencc8ed391999-10-05 16:24:54 +0000267
Erik Andersene49d5ec2000-02-08 19:58:47 +0000268 /* set control chars */
Eric Andersen3849f9b2000-07-10 19:56:47 +0000269 tty.c_cc[VINTR] = 3; /* C-c */
270 tty.c_cc[VQUIT] = 28; /* C-\ */
271 tty.c_cc[VERASE] = 127; /* C-? */
272 tty.c_cc[VKILL] = 21; /* C-u */
273 tty.c_cc[VEOF] = 4; /* C-d */
274 tty.c_cc[VSTART] = 17; /* C-q */
275 tty.c_cc[VSTOP] = 19; /* C-s */
276 tty.c_cc[VSUSP] = 26; /* C-z */
Eric Andersen02bc25b2000-07-06 21:29:32 +0000277
Erik Andersene49d5ec2000-02-08 19:58:47 +0000278 /* use line dicipline 0 */
279 tty.c_line = 0;
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000280
Erik Andersene49d5ec2000-02-08 19:58:47 +0000281 /* Make it be sane */
Erik Andersen6c41c442000-03-19 05:13:49 +0000282 tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD;
Eric Andersend8862922001-04-23 15:14:11 +0000283 tty.c_cflag |= CREAD|HUPCL|CLOCAL;
284
Eric Andersen08b10341999-11-19 02:38:58 +0000285
Erik Andersene49d5ec2000-02-08 19:58:47 +0000286 /* input modes */
287 tty.c_iflag = ICRNL | IXON | IXOFF;
Eric Andersen08b10341999-11-19 02:38:58 +0000288
Erik Andersene49d5ec2000-02-08 19:58:47 +0000289 /* output modes */
290 tty.c_oflag = OPOST | ONLCR;
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000291
Erik Andersene49d5ec2000-02-08 19:58:47 +0000292 /* local modes */
293 tty.c_lflag =
294 ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN;
Eric Andersencc8ed391999-10-05 16:24:54 +0000295
Erik Andersene49d5ec2000-02-08 19:58:47 +0000296 tcsetattr(fd, TCSANOW, &tty);
Eric Andersencc8ed391999-10-05 16:24:54 +0000297}
298
Eric Andersenbc5941a2000-12-06 23:17:37 +0000299/* How much memory does this machine have?
300 Units are kBytes to avoid overflow on 4GB machines */
Erik Andersend07ee462000-02-21 21:26:32 +0000301static int check_free_memory()
Eric Andersencc8ed391999-10-05 16:24:54 +0000302{
Erik Andersend07ee462000-02-21 21:26:32 +0000303 struct sysinfo info;
Eric Andersenbc5941a2000-12-06 23:17:37 +0000304 unsigned int result, u, s=10;
Eric Andersencc8ed391999-10-05 16:24:54 +0000305
Erik Andersend07ee462000-02-21 21:26:32 +0000306 if (sysinfo(&info) != 0) {
Eric Andersen53cfb7e2001-01-31 17:29:47 +0000307 perror_msg("Error checking free memory");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000308 return -1;
Eric Andersenabc7d591999-10-19 00:27:50 +0000309 }
Eric Andersenbc5941a2000-12-06 23:17:37 +0000310
311 /* Kernels 2.0.x and 2.2.x return info.mem_unit==0 with values in bytes.
312 * Kernels 2.4.0 return info.mem_unit in bytes. */
313 u = info.mem_unit;
314 if (u==0) u=1;
315 while ( (u&1) == 0 && s > 0 ) { u>>=1; s--; }
316 result = (info.totalram>>s) + (info.totalswap>>s);
317 result = result*u;
318 if (result < 0) result = INT_MAX;
319 return result;
Eric Andersencc8ed391999-10-05 16:24:54 +0000320}
321
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000322static void console_init()
Eric Andersen0460ff21999-10-25 23:32:44 +0000323{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000324 int fd;
325 int tried_devcons = 0;
326 int tried_vtprimary = 0;
Erik Andersen029011b2000-03-04 21:19:32 +0000327 struct vt_stat vt;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000328 struct serial_struct sr;
329 char *s;
Eric Andersen0460ff21999-10-25 23:32:44 +0000330
Erik Andersene49d5ec2000-02-08 19:58:47 +0000331 if ((s = getenv("TERM")) != NULL) {
332 snprintf(termType, sizeof(termType) - 1, "TERM=%s", s);
333 }
Erik Andersenac6e71f2000-01-08 22:04:33 +0000334
Erik Andersene49d5ec2000-02-08 19:58:47 +0000335 if ((s = getenv("CONSOLE")) != NULL) {
Matt Kraai18447702001-05-18 21:24:58 +0000336 safe_strncpy(console, s, sizeof(console));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000337 }
Eric Andersenfbb39c81999-11-08 17:00:52 +0000338#if #cpu(sparc)
Erik Andersene49d5ec2000-02-08 19:58:47 +0000339 /* sparc kernel supports console=tty[ab] parameter which is also
340 * passed to init, so catch it here */
341 else if ((s = getenv("console")) != NULL) {
342 /* remap tty[ab] to /dev/ttyS[01] */
343 if (strcmp(s, "ttya") == 0)
Matt Kraai18447702001-05-18 21:24:58 +0000344 safe_strncpy(console, SERIAL_CON0, sizeof(console));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000345 else if (strcmp(s, "ttyb") == 0)
Matt Kraai18447702001-05-18 21:24:58 +0000346 safe_strncpy(console, SERIAL_CON1, sizeof(console));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000347 }
Eric Andersen219d6f51999-11-02 19:43:01 +0000348#endif
Erik Andersene49d5ec2000-02-08 19:58:47 +0000349 else {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000350 /* 2.2 kernels: identify the real console backend and try to use it */
351 if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
352 /* this is a serial console */
353 snprintf(console, sizeof(console) - 1, "/dev/ttyS%d", sr.line);
354 } else if (ioctl(0, VT_GETSTATE, &vt) == 0) {
355 /* this is linux virtual tty */
356 snprintf(console, sizeof(console) - 1, "/dev/tty%d",
357 vt.v_active);
358 } else {
Matt Kraai18447702001-05-18 21:24:58 +0000359 safe_strncpy(console, _PATH_CONSOLE, sizeof(console));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000360 tried_devcons++;
361 }
Eric Andersen07e52971999-11-07 07:38:08 +0000362 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000363
364 while ((fd = open(console, O_RDONLY | O_NONBLOCK)) < 0) {
365 /* Can't open selected console -- try /dev/console */
366 if (!tried_devcons) {
367 tried_devcons++;
Matt Kraai18447702001-05-18 21:24:58 +0000368 safe_strncpy(console, _PATH_CONSOLE, sizeof(console));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000369 continue;
370 }
371 /* Can't open selected console -- try vt1 */
372 if (!tried_vtprimary) {
373 tried_vtprimary++;
Matt Kraai18447702001-05-18 21:24:58 +0000374 safe_strncpy(console, VT_PRIMARY, sizeof(console));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000375 continue;
376 }
377 break;
378 }
379 if (fd < 0) {
380 /* Perhaps we should panic here? */
Matt Kraai18447702001-05-18 21:24:58 +0000381 safe_strncpy(console, "/dev/null", sizeof(console));
Eric Andersen07e52971999-11-07 07:38:08 +0000382 } else {
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000383 /* check for serial console and disable logging to tty5 & running a
384 * shell to tty2-4 */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000385 if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000386 log = NULL;
387 secondConsole = NULL;
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000388 thirdConsole = NULL;
389 fourthConsole = NULL;
Erik Andersenfa4718e2000-02-21 19:25:12 +0000390 /* Force the TERM setting to vt102 for serial console --
391 * iff TERM is set to linux (the default) */
392 if (strcmp( termType, "TERM=linux" ) == 0)
Matt Kraai18447702001-05-18 21:24:58 +0000393 safe_strncpy(termType, "TERM=vt102", sizeof(termType));
Erik Andersene132f4b2000-02-09 04:16:43 +0000394 message(LOG | CONSOLE,
395 "serial console detected. Disabling virtual terminals.\r\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000396 }
397 close(fd);
Eric Andersen07e52971999-11-07 07:38:08 +0000398 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000399 message(LOG, "console=%s\n", console);
Eric Andersen0460ff21999-10-25 23:32:44 +0000400}
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000401
402static void fixup_argv(int argc, char **argv, char *new_argv0)
403{
404 int len;
405 /* Fix up argv[0] to be certain we claim to be init */
406 len = strlen(argv[0]);
407 memset(argv[0], 0, len);
408 strncpy(argv[0], new_argv0, len);
409
410 /* Wipe argv[1]-argv[N] so they don't clutter the ps listing */
411 len = 1;
412 while (argc > len) {
413 memset(argv[len], 0, strlen(argv[len]));
414 len++;
415 }
416}
417
Eric Andersen0460ff21999-10-25 23:32:44 +0000418
Erik Andersene49d5ec2000-02-08 19:58:47 +0000419static pid_t run(char *command, char *terminal, int get_enter)
Eric Andersen0460ff21999-10-25 23:32:44 +0000420{
Eric Andersen7f197852001-03-16 01:14:04 +0000421 int i, j;
Eric Andersen477aedd2001-02-20 18:01:50 +0000422 int fd;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000423 pid_t pid;
Eric Andersen7f197852001-03-16 01:14:04 +0000424 char *tmpCmd, *s;
425 char *cmd[255], *cmdpath;
Erik Andersene132f4b2000-02-09 04:16:43 +0000426 char buf[255];
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000427 struct stat sb;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000428 static const char press_enter[] =
429
Eric Andersen38624232001-01-25 00:04:16 +0000430#ifdef CUSTOMIZED_BANNER
431#include CUSTOMIZED_BANNER
432#endif
433
Erik Andersene49d5ec2000-02-08 19:58:47 +0000434 "\nPlease press Enter to activate this console. ";
Eric Andersen477aedd2001-02-20 18:01:50 +0000435 char *environment[MAXENV+1] = {
Eric Andersen7f197852001-03-16 01:14:04 +0000436 termType,
Erik Andersene49d5ec2000-02-08 19:58:47 +0000437 "HOME=/",
438 "PATH=/usr/bin:/bin:/usr/sbin:/sbin",
Matt Kraai7bd773c2001-06-12 20:55:02 +0000439 "SHELL=" SHELL,
Eric Andersen7f197852001-03-16 01:14:04 +0000440 "USER=root",
441 NULL
Erik Andersene49d5ec2000-02-08 19:58:47 +0000442 };
Erik Andersenac6e71f2000-01-08 22:04:33 +0000443
Eric Andersen7f197852001-03-16 01:14:04 +0000444 /* inherit environment to the child, merging our values -andy */
445 for (i=0; environ[i]; i++) {
446 for (j=0; environment[j]; j++) {
447 s = strchr(environment[j], '=');
448 if (!strncmp(environ[i], environment[j], s - environment[j]))
449 break;
450 }
451 if (!environment[j]) {
452 environment[j++] = environ[i];
453 environment[j] = NULL;
454 }
Eric Andersen477aedd2001-02-20 18:01:50 +0000455 }
456
Erik Andersene49d5ec2000-02-08 19:58:47 +0000457 if ((pid = fork()) == 0) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000458 /* Clean up */
Eric Andersenfb6a5082000-09-13 16:15:29 +0000459 ioctl(0, TIOCNOTTY, 0);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000460 close(0);
461 close(1);
462 close(2);
463 setsid();
Eric Andersen0460ff21999-10-25 23:32:44 +0000464
Erik Andersene49d5ec2000-02-08 19:58:47 +0000465 /* Reset signal handlers set for parent process */
466 signal(SIGUSR1, SIG_DFL);
467 signal(SIGUSR2, SIG_DFL);
468 signal(SIGINT, SIG_DFL);
469 signal(SIGTERM, SIG_DFL);
470 signal(SIGHUP, SIG_DFL);
Eric Andersen2f6c04f1999-11-01 23:59:44 +0000471
Erik Andersene49d5ec2000-02-08 19:58:47 +0000472 if ((fd = device_open(terminal, O_RDWR)) < 0) {
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000473 if (stat(terminal, &sb) != 0) {
Eric Andersen53f50612001-03-14 09:01:11 +0000474 message(LOG | CONSOLE, "device '%s' does not exist.\n",
475 terminal);
476 exit(1);
477 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000478 message(LOG | CONSOLE, "Bummer, can't open %s\r\n", terminal);
479 exit(1);
480 }
481 dup2(fd, 0);
482 dup2(fd, 1);
483 dup2(fd, 2);
Eric Andersenfb6a5082000-09-13 16:15:29 +0000484 ioctl(0, TIOCSCTTY, 1);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000485 tcsetpgrp(0, getpgrp());
486 set_term(0);
487
Erik Andersene132f4b2000-02-09 04:16:43 +0000488 /* See if any special /bin/sh requiring characters are present */
489 if (strpbrk(command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
490 cmd[0] = SHELL;
491 cmd[1] = "-c";
492 strcpy(buf, "exec ");
493 strncat(buf, command, sizeof(buf) - strlen(buf) - 1);
494 cmd[2] = buf;
495 cmd[3] = NULL;
496 } else {
497 /* Convert command (char*) into cmd (char**, one word per string) */
498 for (tmpCmd = command, i = 0;
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000499 (tmpCmd = strsep(&command, " \t")) != NULL;) {
Erik Andersene132f4b2000-02-09 04:16:43 +0000500 if (*tmpCmd != '\0') {
501 cmd[i] = tmpCmd;
502 tmpCmd++;
503 i++;
504 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000505 }
Erik Andersene132f4b2000-02-09 04:16:43 +0000506 cmd[i] = NULL;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000507 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000508
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000509 cmdpath = cmd[0];
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000510
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000511 /*
512 Interactive shells want to see a dash in argv[0]. This
513 typically is handled by login, argv will be setup this
514 way if a dash appears at the front of the command path
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000515 (like "-/bin/sh").
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000516 */
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000517
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000518 if (*cmdpath == '-') {
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000519
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000520 /* skip over the dash */
521 ++cmdpath;
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000522
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000523 /* find the last component in the command pathname */
524 s = get_last_path_component(cmdpath);
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000525
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000526 /* make a new argv[0] */
527 if ((cmd[0] = malloc(strlen(s)+2)) == NULL) {
528 message(LOG | CONSOLE, "malloc failed");
529 cmd[0] = cmdpath;
530 } else {
531 cmd[0][0] = '-';
532 strcpy(cmd[0]+1, s);
533 }
534 }
535
536 if (get_enter == TRUE) {
537 /*
538 * Save memory by not exec-ing anything large (like a shell)
539 * before the user wants it. This is critical if swap is not
540 * enabled and the system has low memory. Generally this will
541 * be run on the second virtual console, and the first will
542 * be allowed to start a shell or whatever an init script
543 * specifies.
544 */
545#ifdef DEBUG_INIT
546 message(LOG, "Waiting for enter to start '%s' (pid %d, console %s)\r\n",
547 cmd[0], getpid(), terminal);
548#endif
549 write(fileno(stdout), press_enter, sizeof(press_enter) - 1);
550 getc(stdin);
551 }
552
553#ifdef DEBUG_INIT
554 /* Log the process name and args */
555 message(LOG, "Starting pid %d, console %s: '%s'\r\n",
556 getpid(), terminal, command);
557#endif
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000558
Erik Andersen183da4a2000-04-04 18:36:37 +0000559#if defined BB_FEATURE_INIT_COREDUMPS
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000560 if (stat (CORE_ENABLE_FLAG_FILE, &sb) == 0) {
561 struct rlimit limit;
562 limit.rlim_cur = RLIM_INFINITY;
563 limit.rlim_max = RLIM_INFINITY;
564 setrlimit(RLIMIT_CORE, &limit);
Erik Andersen983b51b2000-04-04 18:14:25 +0000565 }
Erik Andersen183da4a2000-04-04 18:36:37 +0000566#endif
Erik Andersen983b51b2000-04-04 18:14:25 +0000567
Erik Andersene49d5ec2000-02-08 19:58:47 +0000568 /* Now run it. The new program will take over this PID,
569 * so nothing further in init.c should be run. */
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000570 execve(cmdpath, cmd, environment);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000571
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000572 /* We're still here? Some error happened. */
573 message(LOG | CONSOLE, "Bummer, could not run '%s': %s\n", cmdpath,
574 strerror(errno));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000575 exit(-1);
Erik Andersen05df2392000-01-13 04:43:48 +0000576 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000577 return pid;
Eric Andersen0460ff21999-10-25 23:32:44 +0000578}
579
Erik Andersene49d5ec2000-02-08 19:58:47 +0000580static int waitfor(char *command, char *terminal, int get_enter)
Erik Andersen0e3782f2000-01-07 02:54:55 +0000581{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000582 int status, wpid;
583 int pid = run(command, terminal, get_enter);
Erik Andersen0e3782f2000-01-07 02:54:55 +0000584
Erik Andersene49d5ec2000-02-08 19:58:47 +0000585 while (1) {
586 wpid = wait(&status);
Erik Andersene132f4b2000-02-09 04:16:43 +0000587 if (wpid > 0 && wpid != pid) {
588 continue;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000589 }
590 if (wpid == pid)
591 break;
Erik Andersen0e3782f2000-01-07 02:54:55 +0000592 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000593 return wpid;
Erik Andersen0e3782f2000-01-07 02:54:55 +0000594}
595
Eric Andersen219d6f51999-11-02 19:43:01 +0000596/* Make sure there is enough memory to do something useful. *
Erik Andersene132f4b2000-02-09 04:16:43 +0000597 * Calls "swapon -a" if needed so be sure /etc/fstab is present... */
Eric Andersen219d6f51999-11-02 19:43:01 +0000598static void check_memory()
599{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000600 struct stat statBuf;
Eric Andersen219d6f51999-11-02 19:43:01 +0000601
Erik Andersend07ee462000-02-21 21:26:32 +0000602 if (check_free_memory() > 1000)
Erik Andersene49d5ec2000-02-08 19:58:47 +0000603 return;
604
605 if (stat("/etc/fstab", &statBuf) == 0) {
Erik Andersen61677fe2000-04-13 01:18:56 +0000606 /* swapon -a requires /proc typically */
607 waitfor("mount proc /proc -t proc", console, FALSE);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000608 /* Try to turn on swap */
Erik Andersen61677fe2000-04-13 01:18:56 +0000609 waitfor("swapon -a", console, FALSE);
Erik Andersend07ee462000-02-21 21:26:32 +0000610 if (check_free_memory() < 1000)
Erik Andersene49d5ec2000-02-08 19:58:47 +0000611 goto goodnight;
612 } else
613 goto goodnight;
Eric Andersen219d6f51999-11-02 19:43:01 +0000614 return;
615
Erik Andersene49d5ec2000-02-08 19:58:47 +0000616 goodnight:
617 message(CONSOLE,
618 "Sorry, your computer does not have enough memory.\r\n");
Matt Kraai67a46402001-06-03 05:55:52 +0000619 loop_forever();
Eric Andersen219d6f51999-11-02 19:43:01 +0000620}
621
Erik Andersene132f4b2000-02-09 04:16:43 +0000622/* Run all commands to be run right before halt/reboot */
Eric Andersenc97ec342001-04-03 18:01:51 +0000623static void run_actions(initActionEnum action)
Erik Andersene132f4b2000-02-09 04:16:43 +0000624{
Eric Andersen0d4e51d2001-03-15 19:18:21 +0000625 initAction *a, *tmp;
Eric Andersena4edd0e2001-03-15 21:04:18 +0000626 for (a = initActionList; a; a = tmp) {
627 tmp = a->nextPtr;
Eric Andersenc97ec342001-04-03 18:01:51 +0000628 if (a->action == action) {
Erik Andersene132f4b2000-02-09 04:16:43 +0000629 waitfor(a->process, a->console, FALSE);
630 delete_initAction(a);
631 }
632 }
633}
634
635
Erik Andersen7dc16072000-01-04 01:10:25 +0000636#ifndef DEBUG_INIT
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000637static void shutdown_system(void)
Eric Andersencc8ed391999-10-05 16:24:54 +0000638{
Erik Andersene132f4b2000-02-09 04:16:43 +0000639
Erik Andersene49d5ec2000-02-08 19:58:47 +0000640 /* first disable our SIGHUP signal */
641 signal(SIGHUP, SIG_DFL);
Erik Andersen7dc16072000-01-04 01:10:25 +0000642
Erik Andersene49d5ec2000-02-08 19:58:47 +0000643 /* Allow Ctrl-Alt-Del to reboot system. */
Erik Andersen4f3f7572000-04-28 00:18:56 +0000644 init_reboot(RB_ENABLE_CAD);
Erik Andersene132f4b2000-02-09 04:16:43 +0000645
646 message(CONSOLE|LOG, "\r\nThe system is going down NOW !!\r\n");
Eric Andersencf8c9cf1999-11-05 00:31:46 +0000647 sync();
Erik Andersene49d5ec2000-02-08 19:58:47 +0000648
649 /* Send signals to every process _except_ pid 1 */
Erik Andersene132f4b2000-02-09 04:16:43 +0000650 message(CONSOLE|LOG, "Sending SIGTERM to all processes.\r\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000651 kill(-1, SIGTERM);
Erik Andersene132f4b2000-02-09 04:16:43 +0000652 sleep(1);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000653 sync();
654
Erik Andersene132f4b2000-02-09 04:16:43 +0000655 message(CONSOLE|LOG, "Sending SIGKILL to all processes.\r\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000656 kill(-1, SIGKILL);
Erik Andersene132f4b2000-02-09 04:16:43 +0000657 sleep(1);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000658
Matt Kraai8fc364e2001-04-12 20:12:16 +0000659 /* run everything to be run at "shutdown" */
Eric Andersenc97ec342001-04-03 18:01:51 +0000660 run_actions(SHUTDOWN);
Erik Andersene132f4b2000-02-09 04:16:43 +0000661
Erik Andersene49d5ec2000-02-08 19:58:47 +0000662 sync();
Eric Andersenbd22ed82000-07-08 18:55:24 +0000663 if (kernelVersion > 0 && kernelVersion <= KERNEL_VERSION(2,2,11)) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000664 /* bdflush, kupdate not needed for kernels >2.2.11 */
665 bdflush(1, 0);
666 sync();
667 }
Eric Andersencc8ed391999-10-05 16:24:54 +0000668}
669
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000670static void halt_signal(int sig)
Eric Andersencc8ed391999-10-05 16:24:54 +0000671{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000672 shutdown_system();
Erik Andersene132f4b2000-02-09 04:16:43 +0000673 message(CONSOLE|LOG,
Erik Andersene49d5ec2000-02-08 19:58:47 +0000674 "The system is halted. Press %s or turn off power\r\n",
675 (secondConsole == NULL) /* serial console */
676 ? "Reset" : "CTRL-ALT-DEL");
677 sync();
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000678
Erik Andersene49d5ec2000-02-08 19:58:47 +0000679 /* allow time for last message to reach serial console */
Erik Andersene132f4b2000-02-09 04:16:43 +0000680 sleep(2);
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000681
Eric Andersenbd22ed82000-07-08 18:55:24 +0000682 if (sig == SIGUSR2 && kernelVersion >= KERNEL_VERSION(2,2,0))
Erik Andersen4f3f7572000-04-28 00:18:56 +0000683 init_reboot(RB_POWER_OFF);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000684 else
Erik Andersen4f3f7572000-04-28 00:18:56 +0000685 init_reboot(RB_HALT_SYSTEM);
Matt Kraai67a46402001-06-03 05:55:52 +0000686
687 loop_forever();
Eric Andersencc8ed391999-10-05 16:24:54 +0000688}
689
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000690static void reboot_signal(int sig)
Eric Andersencc8ed391999-10-05 16:24:54 +0000691{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000692 shutdown_system();
Erik Andersene132f4b2000-02-09 04:16:43 +0000693 message(CONSOLE|LOG, "Please stand by while rebooting the system.\r\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000694 sync();
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000695
Erik Andersene49d5ec2000-02-08 19:58:47 +0000696 /* allow time for last message to reach serial console */
697 sleep(2);
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000698
Erik Andersen4f3f7572000-04-28 00:18:56 +0000699 init_reboot(RB_AUTOBOOT);
Matt Kraai67a46402001-06-03 05:55:52 +0000700
701 loop_forever();
Eric Andersencc8ed391999-10-05 16:24:54 +0000702}
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000703
Eric Andersenc97ec342001-04-03 18:01:51 +0000704static void ctrlaltdel_signal(int sig)
705{
706 run_actions(CTRLALTDEL);
707}
708
Erik Andersene49d5ec2000-02-08 19:58:47 +0000709#endif /* ! DEBUG_INIT */
Erik Andersende552872000-01-23 01:34:05 +0000710
Eric Andersen3e6ff902001-03-09 21:24:12 +0000711static void new_initAction(initActionEnum action, char *process, char *cons)
Erik Andersen7dc16072000-01-04 01:10:25 +0000712{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000713 initAction *newAction;
Erik Andersen9e737252000-01-06 01:16:13 +0000714
Erik Andersene49d5ec2000-02-08 19:58:47 +0000715 if (*cons == '\0')
716 cons = console;
Erik Andersen9e737252000-01-06 01:16:13 +0000717
Erik Andersene49d5ec2000-02-08 19:58:47 +0000718 /* If BusyBox detects that a serial console is in use,
719 * then entries not refering to the console or null devices will _not_ be run.
720 * The exception to this rule is the null device.
721 */
722 if (secondConsole == NULL && strcmp(cons, console)
723 && strcmp(cons, "/dev/null"))
724 return;
725
726 newAction = calloc((size_t) (1), sizeof(initAction));
727 if (!newAction) {
728 message(LOG | CONSOLE, "Memory allocation failure\n");
Matt Kraai67a46402001-06-03 05:55:52 +0000729 loop_forever();
Erik Andersene49d5ec2000-02-08 19:58:47 +0000730 }
731 newAction->nextPtr = initActionList;
732 initActionList = newAction;
733 strncpy(newAction->process, process, 255);
734 newAction->action = action;
735 strncpy(newAction->console, cons, 255);
736 newAction->pid = 0;
Erik Andersen31638212000-01-15 22:28:50 +0000737// message(LOG|CONSOLE, "process='%s' action='%d' console='%s'\n",
Erik Andersene49d5ec2000-02-08 19:58:47 +0000738// newAction->process, newAction->action, newAction->console);
Erik Andersen7dc16072000-01-04 01:10:25 +0000739}
740
Erik Andersene132f4b2000-02-09 04:16:43 +0000741static void delete_initAction(initAction * action)
Erik Andersen7dc16072000-01-04 01:10:25 +0000742{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000743 initAction *a, *b = NULL;
744
745 for (a = initActionList; a; b = a, a = a->nextPtr) {
746 if (a == action) {
747 if (b == NULL) {
748 initActionList = a->nextPtr;
749 } else {
750 b->nextPtr = a->nextPtr;
751 }
752 free(a);
753 break;
754 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000755 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000756}
757
Erik Andersen9e737252000-01-06 01:16:13 +0000758/* NOTE that if BB_FEATURE_USE_INITTAB is NOT defined,
759 * then parse_inittab() simply adds in some default
Eric Andersen77d92682001-05-23 20:32:09 +0000760 * actions(i.e., runs INIT_SCRIPT and then starts a pair
Erik Andersen812d4662000-01-07 18:30:40 +0000761 * of "askfirst" shells). If BB_FEATURE_USE_INITTAB
762 * _is_ defined, but /etc/inittab is missing, this
763 * results in the same set of default behaviors.
Erik Andersen9e737252000-01-06 01:16:13 +0000764 * */
Eric Andersen3e6ff902001-03-09 21:24:12 +0000765static void parse_inittab(void)
Erik Andersen7dc16072000-01-04 01:10:25 +0000766{
Erik Andersen9e737252000-01-06 01:16:13 +0000767#ifdef BB_FEATURE_USE_INITTAB
Erik Andersene49d5ec2000-02-08 19:58:47 +0000768 FILE *file;
769 char buf[256], lineAsRead[256], tmpConsole[256];
Eric Andersenb5966362000-05-31 20:04:38 +0000770 char *id, *runlev, *action, *process, *eol;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000771 const struct initActionType *a = actions;
772 int foundIt;
Erik Andersen7dc16072000-01-04 01:10:25 +0000773
774
Erik Andersene49d5ec2000-02-08 19:58:47 +0000775 file = fopen(INITTAB, "r");
776 if (file == NULL) {
777 /* No inittab file -- set up some default behavior */
Erik Andersen9e737252000-01-06 01:16:13 +0000778#endif
Eric Andersenc97ec342001-04-03 18:01:51 +0000779 /* Reboot on Ctrl-Alt-Del */
780 new_initAction(CTRLALTDEL, "/sbin/reboot", console);
Erik Andersene132f4b2000-02-09 04:16:43 +0000781 /* Swapoff on halt/reboot */
Eric Andersenc97ec342001-04-03 18:01:51 +0000782 new_initAction(SHUTDOWN, "/sbin/swapoff -a", console);
Erik Andersene132f4b2000-02-09 04:16:43 +0000783 /* Umount all filesystems on halt/reboot */
Eric Andersenc97ec342001-04-03 18:01:51 +0000784 new_initAction(SHUTDOWN, "/bin/umount -a -r", console);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000785 /* Askfirst shell on tty1 */
Matt Kraai7bd773c2001-06-12 20:55:02 +0000786 new_initAction(ASKFIRST, LOGIN_SHELL, console);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000787 /* Askfirst shell on tty2 */
788 if (secondConsole != NULL)
Matt Kraai7bd773c2001-06-12 20:55:02 +0000789 new_initAction(ASKFIRST, LOGIN_SHELL, secondConsole);
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000790 /* Askfirst shell on tty3 */
791 if (thirdConsole != NULL)
Matt Kraai7bd773c2001-06-12 20:55:02 +0000792 new_initAction(ASKFIRST, LOGIN_SHELL, thirdConsole);
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000793 /* Askfirst shell on tty4 */
794 if (fourthConsole != NULL)
Matt Kraai7bd773c2001-06-12 20:55:02 +0000795 new_initAction(ASKFIRST, LOGIN_SHELL, fourthConsole);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000796 /* sysinit */
797 new_initAction(SYSINIT, INIT_SCRIPT, console);
Erik Andersen7dc16072000-01-04 01:10:25 +0000798
Erik Andersene49d5ec2000-02-08 19:58:47 +0000799 return;
Erik Andersen9e737252000-01-06 01:16:13 +0000800#ifdef BB_FEATURE_USE_INITTAB
Erik Andersen9e737252000-01-06 01:16:13 +0000801 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000802
Erik Andersene49d5ec2000-02-08 19:58:47 +0000803 while (fgets(buf, 255, file) != NULL) {
804 foundIt = FALSE;
Eric Andersenb5966362000-05-31 20:04:38 +0000805 /* Skip leading spaces */
806 for (id = buf; *id == ' ' || *id == '\t'; id++);
807
808 /* Skip the line if it's a comment */
809 if (*id == '#' || *id == '\n')
Erik Andersene49d5ec2000-02-08 19:58:47 +0000810 continue;
Erik Andersen7dc16072000-01-04 01:10:25 +0000811
Erik Andersene49d5ec2000-02-08 19:58:47 +0000812 /* Trim the trailing \n */
Eric Andersenb5966362000-05-31 20:04:38 +0000813 eol = strrchr(id, '\n');
814 if (eol != NULL)
815 *eol = '\0';
Erik Andersen7dc16072000-01-04 01:10:25 +0000816
Erik Andersene49d5ec2000-02-08 19:58:47 +0000817 /* Keep a copy around for posterity's sake (and error msgs) */
818 strcpy(lineAsRead, buf);
819
Eric Andersenb5966362000-05-31 20:04:38 +0000820 /* Separate the ID field from the runlevels */
821 runlev = strchr(id, ':');
822 if (runlev == NULL || *(runlev + 1) == '\0') {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000823 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
824 continue;
825 } else {
Eric Andersenb5966362000-05-31 20:04:38 +0000826 *runlev = '\0';
827 ++runlev;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000828 }
829
Eric Andersenb5966362000-05-31 20:04:38 +0000830 /* Separate the runlevels from the action */
831 action = strchr(runlev, ':');
832 if (action == NULL || *(action + 1) == '\0') {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000833 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
834 continue;
835 } else {
Eric Andersenb5966362000-05-31 20:04:38 +0000836 *action = '\0';
837 ++action;
838 }
839
840 /* Separate the action from the process */
841 process = strchr(action, ':');
842 if (process == NULL || *(process + 1) == '\0') {
843 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
844 continue;
845 } else {
846 *process = '\0';
847 ++process;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000848 }
849
850 /* Ok, now process it */
851 a = actions;
852 while (a->name != 0) {
Eric Andersenb5966362000-05-31 20:04:38 +0000853 if (strcmp(a->name, action) == 0) {
854 if (*id != '\0') {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000855 strcpy(tmpConsole, "/dev/");
Eric Andersenb5966362000-05-31 20:04:38 +0000856 strncat(tmpConsole, id, 200);
Eric Andersenb5966362000-05-31 20:04:38 +0000857 id = tmpConsole;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000858 }
Eric Andersenb5966362000-05-31 20:04:38 +0000859 new_initAction(a->action, process, id);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000860 foundIt = TRUE;
861 }
862 a++;
863 }
864 if (foundIt == TRUE)
865 continue;
866 else {
867 /* Choke on an unknown action */
868 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
869 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000870 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000871 return;
Erik Andersen42094cd2000-03-20 21:34:52 +0000872#endif /* BB_FEATURE_USE_INITTAB */
Erik Andersen7dc16072000-01-04 01:10:25 +0000873}
874
Erik Andersene132f4b2000-02-09 04:16:43 +0000875
876
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000877extern int init_main(int argc, char **argv)
Eric Andersen0460ff21999-10-25 23:32:44 +0000878{
Eric Andersen0d4e51d2001-03-15 19:18:21 +0000879 initAction *a, *tmp;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000880 pid_t wpid;
881 int status;
Eric Andersen0460ff21999-10-25 23:32:44 +0000882
Eric Andersend73dc5b1999-11-10 23:13:02 +0000883#ifndef DEBUG_INIT
Erik Andersena51ecdd2000-02-24 18:09:58 +0000884 /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
885 if (getpid() != 1
886#ifdef BB_FEATURE_LINUXRC
Matt Kraaie58771e2000-07-12 15:38:49 +0000887 && strstr(applet_name, "linuxrc") == NULL
Erik Andersena51ecdd2000-02-24 18:09:58 +0000888#endif
889 )
890 {
Eric Andersen67991cf2001-02-14 21:23:06 +0000891 show_usage();
Erik Andersene49d5ec2000-02-08 19:58:47 +0000892 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000893 /* Set up sig handlers -- be sure to
894 * clear all of these in run() */
895 signal(SIGUSR1, halt_signal);
Eric Andersen4c95a282000-07-07 19:30:28 +0000896 signal(SIGUSR2, halt_signal);
Eric Andersenc97ec342001-04-03 18:01:51 +0000897 signal(SIGINT, ctrlaltdel_signal);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000898 signal(SIGTERM, reboot_signal);
Eric Andersen0460ff21999-10-25 23:32:44 +0000899
Erik Andersene49d5ec2000-02-08 19:58:47 +0000900 /* Turn off rebooting via CTL-ALT-DEL -- we get a
901 * SIGINT on CAD so we can shut things down gracefully... */
Erik Andersen4f3f7572000-04-28 00:18:56 +0000902 init_reboot(RB_DISABLE_CAD);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000903#endif
Erik Andersen05df2392000-01-13 04:43:48 +0000904
Erik Andersen298854f2000-03-23 01:09:18 +0000905 /* Figure out what kernel this is running */
906 kernelVersion = get_kernel_revision();
907
Erik Andersene49d5ec2000-02-08 19:58:47 +0000908 /* Figure out where the default console should be */
909 console_init();
Eric Andersen0460ff21999-10-25 23:32:44 +0000910
Erik Andersene49d5ec2000-02-08 19:58:47 +0000911 /* Close whatever files are open, and reset the console. */
912 close(0);
913 close(1);
914 close(2);
915 set_term(0);
Erik Andersen983b51b2000-04-04 18:14:25 +0000916 chdir("/");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000917 setsid();
Eric Andersencc8ed391999-10-05 16:24:54 +0000918
Erik Andersene49d5ec2000-02-08 19:58:47 +0000919 /* Make sure PATH is set to something sane */
Eric Andersen452fd332001-03-04 06:47:33 +0000920 putenv("PATH="_PATH_STDPATH);
Eric Andersencc8ed391999-10-05 16:24:54 +0000921
Erik Andersene49d5ec2000-02-08 19:58:47 +0000922 /* Hello world */
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000923#ifndef DEBUG_INIT
Erik Andersenea6b67d2000-03-07 07:47:10 +0000924 message(
925#if ! defined BB_FEATURE_EXTRA_QUIET
926 CONSOLE|
927#endif
928 LOG,
Pavel Roskin9c5fcc32000-07-17 23:45:12 +0000929 "init started: %s\r\n", full_version);
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000930#else
Erik Andersenea6b67d2000-03-07 07:47:10 +0000931 message(
932#if ! defined BB_FEATURE_EXTRA_QUIET
933 CONSOLE|
934#endif
935 LOG,
Pavel Roskin9c5fcc32000-07-17 23:45:12 +0000936 "init(%d) started: %s\r\n", getpid(), full_version);
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000937#endif
Eric Andersencc8ed391999-10-05 16:24:54 +0000938
Eric Andersencc8ed391999-10-05 16:24:54 +0000939
Erik Andersene49d5ec2000-02-08 19:58:47 +0000940 /* Make sure there is enough memory to do something useful. */
941 check_memory();
Erik Andersen9e737252000-01-06 01:16:13 +0000942
Erik Andersene49d5ec2000-02-08 19:58:47 +0000943 /* Check if we are supposed to be in single user mode */
944 if (argc > 1 && (!strcmp(argv[1], "single") ||
945 !strcmp(argv[1], "-s") || !strcmp(argv[1], "1"))) {
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000946 /* Ask first then start a shell on tty2-4 */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000947 if (secondConsole != NULL)
Matt Kraai7bd773c2001-06-12 20:55:02 +0000948 new_initAction(ASKFIRST, LOGIN_SHELL, secondConsole);
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000949 if (thirdConsole != NULL)
Matt Kraai7bd773c2001-06-12 20:55:02 +0000950 new_initAction(ASKFIRST, LOGIN_SHELL, thirdConsole);
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000951 if (fourthConsole != NULL)
Matt Kraai7bd773c2001-06-12 20:55:02 +0000952 new_initAction(ASKFIRST, LOGIN_SHELL, fourthConsole);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000953 /* Start a shell on tty1 */
Matt Kraai7bd773c2001-06-12 20:55:02 +0000954 new_initAction(RESPAWN, LOGIN_SHELL, console);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000955 } else {
956 /* Not in single user mode -- see what inittab says */
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000957
Erik Andersene49d5ec2000-02-08 19:58:47 +0000958 /* NOTE that if BB_FEATURE_USE_INITTAB is NOT defined,
959 * then parse_inittab() simply adds in some default
Eric Andersen77d92682001-05-23 20:32:09 +0000960 * actions(i.e., runs INIT_SCRIPT and then starts a pair
Erik Andersene49d5ec2000-02-08 19:58:47 +0000961 * of "askfirst" shells */
962 parse_inittab();
Eric Andersend00c2621999-12-07 08:37:31 +0000963 }
Erik Andersen983b51b2000-04-04 18:14:25 +0000964
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000965 /* Make the command line just say "init" -- thats all, nothing else */
966 fixup_argv(argc, argv, "init");
Eric Andersen219d6f51999-11-02 19:43:01 +0000967
Erik Andersene49d5ec2000-02-08 19:58:47 +0000968 /* Now run everything that needs to be run */
969
970 /* First run the sysinit command */
Eric Andersena4edd0e2001-03-15 21:04:18 +0000971 for (a = initActionList; a; a = tmp) {
972 tmp = a->nextPtr;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000973 if (a->action == SYSINIT) {
974 waitfor(a->process, a->console, FALSE);
975 /* Now remove the "sysinit" entry from the list */
976 delete_initAction(a);
Erik Andersen7dc16072000-01-04 01:10:25 +0000977 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000978 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000979 /* Next run anything that wants to block */
Eric Andersena4edd0e2001-03-15 21:04:18 +0000980 for (a = initActionList; a; a = tmp) {
981 tmp = a->nextPtr;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000982 if (a->action == WAIT) {
983 waitfor(a->process, a->console, FALSE);
984 /* Now remove the "wait" entry from the list */
985 delete_initAction(a);
Erik Andersen7dc16072000-01-04 01:10:25 +0000986 }
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000987 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000988 /* Next run anything to be run only once */
Eric Andersena4edd0e2001-03-15 21:04:18 +0000989 for (a = initActionList; a; a = tmp) {
990 tmp = a->nextPtr;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000991 if (a->action == ONCE) {
992 run(a->process, a->console, FALSE);
993 /* Now remove the "once" entry from the list */
994 delete_initAction(a);
995 }
996 }
997 /* If there is nothing else to do, stop */
998 if (initActionList == NULL) {
999 message(LOG | CONSOLE,
1000 "No more tasks for init -- sleeping forever.\n");
Matt Kraai67a46402001-06-03 05:55:52 +00001001 loop_forever();
Erik Andersene49d5ec2000-02-08 19:58:47 +00001002 }
1003
1004 /* Now run the looping stuff for the rest of forever */
1005 while (1) {
1006 for (a = initActionList; a; a = a->nextPtr) {
1007 /* Only run stuff with pid==0. If they have
1008 * a pid, that means they are still running */
1009 if (a->pid == 0) {
1010 switch (a->action) {
1011 case RESPAWN:
1012 /* run the respawn stuff */
1013 a->pid = run(a->process, a->console, FALSE);
1014 break;
1015 case ASKFIRST:
1016 /* run the askfirst stuff */
1017 a->pid = run(a->process, a->console, TRUE);
1018 break;
1019 /* silence the compiler's incessant whining */
1020 default:
1021 break;
1022 }
1023 }
1024 }
1025 /* Wait for a child process to exit */
1026 wpid = wait(&status);
1027 if (wpid > 0) {
1028 /* Find out who died and clean up their corpse */
1029 for (a = initActionList; a; a = a->nextPtr) {
1030 if (a->pid == wpid) {
1031 a->pid = 0;
1032 message(LOG,
1033 "Process '%s' (pid %d) exited. Scheduling it for restart.\n",
1034 a->process, wpid);
1035 }
1036 }
1037 }
1038 sleep(1);
1039 }
Eric Andersencc8ed391999-10-05 16:24:54 +00001040}
Erik Andersen029011b2000-03-04 21:19:32 +00001041
1042/*
1043Local Variables:
1044c-file-style: "linux"
1045c-basic-offset: 4
1046tab-width: 4
1047End:
1048*/