blob: c26314c8be9b5dfaf2b743d6a9d47fac9fb02483 [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 */
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000127#define SHELL "-/bin/sh" /* Default shell */
Erik Andersen42094cd2000-03-20 21:34:52 +0000128#define INITTAB "/etc/inittab" /* inittab file location */
Erik Andersen96e2abd2000-01-07 11:40:44 +0000129#ifndef INIT_SCRIPT
Erik Andersen42094cd2000-03-20 21:34:52 +0000130#define INIT_SCRIPT "/etc/init.d/rcS" /* Default sysinit script. */
Erik Andersen96e2abd2000-01-07 11:40:44 +0000131#endif
Erik Andersen9c88cac1999-12-30 09:25:17 +0000132
Eric Andersen41492d62001-02-23 00:05:56 +0000133#define MAXENV 16 /* Number of env. vars */
134//static const int MAXENV = 16; /* Number of env. vars */
Mark Whitley59ab0252001-01-23 22:30:04 +0000135static const int LOG = 0x1;
136static const int CONSOLE = 0x2;
Erik Andersen7dc16072000-01-04 01:10:25 +0000137
138/* Allowed init action types */
139typedef enum {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000140 SYSINIT = 1,
141 RESPAWN,
142 ASKFIRST,
143 WAIT,
Erik Andersene132f4b2000-02-09 04:16:43 +0000144 ONCE,
Eric Andersenc97ec342001-04-03 18:01:51 +0000145 CTRLALTDEL,
146 SHUTDOWN
Erik Andersen7dc16072000-01-04 01:10:25 +0000147} initActionEnum;
148
Erik Andersen42094cd2000-03-20 21:34:52 +0000149/* A mapping between "inittab" action name strings and action type codes. */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000150typedef struct initActionType {
151 const char *name;
152 initActionEnum action;
Erik Andersen7dc16072000-01-04 01:10:25 +0000153} initActionType;
154
155static const struct initActionType actions[] = {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000156 {"sysinit", SYSINIT},
157 {"respawn", RESPAWN},
158 {"askfirst", ASKFIRST},
159 {"wait", WAIT},
160 {"once", ONCE},
Erik Andersene132f4b2000-02-09 04:16:43 +0000161 {"ctrlaltdel", CTRLALTDEL},
Eric Andersenc97ec342001-04-03 18:01:51 +0000162 {"shutdown", SHUTDOWN},
Pavel Roskin9027bcf2000-07-14 15:44:25 +0000163 {0, 0}
Erik Andersen7dc16072000-01-04 01:10:25 +0000164};
165
Erik Andersen42094cd2000-03-20 21:34:52 +0000166/* Set up a linked list of initActions, to be read from inittab */
Erik Andersen7dc16072000-01-04 01:10:25 +0000167typedef struct initActionTag initAction;
168struct initActionTag {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000169 pid_t pid;
170 char process[256];
171 char console[256];
172 initAction *nextPtr;
173 initActionEnum action;
Erik Andersen7dc16072000-01-04 01:10:25 +0000174};
Eric Andersen3e6ff902001-03-09 21:24:12 +0000175static initAction *initActionList = NULL;
Erik Andersen7dc16072000-01-04 01:10:25 +0000176
177
Erik Andersenac6e71f2000-01-08 22:04:33 +0000178static char *secondConsole = VT_SECONDARY;
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000179static char *thirdConsole = VT_THIRD;
180static char *fourthConsole = VT_FOURTH;
Erik Andersen42094cd2000-03-20 21:34:52 +0000181static char *log = VT_LOG;
182static int kernelVersion = 0;
183static char termType[32] = "TERM=linux";
184static char console[32] = _PATH_CONSOLE;
185
Erik Andersene132f4b2000-02-09 04:16:43 +0000186static void delete_initAction(initAction * action);
Eric Andersen0460ff21999-10-25 23:32:44 +0000187
188
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000189
Erik Andersen42094cd2000-03-20 21:34:52 +0000190/* Print a message to the specified device.
191 * Device may be bitwise-or'd from LOG | CONSOLE */
192static void message(int device, char *fmt, ...)
Erik Andersen93d65132000-04-06 08:06:36 +0000193 __attribute__ ((format (printf, 2, 3)));
194static void message(int device, char *fmt, ...)
Eric Andersen0460ff21999-10-25 23:32:44 +0000195{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000196 va_list arguments;
197 int fd;
Erik Andersen7dc16072000-01-04 01:10:25 +0000198
Eric Andersen4c781471999-11-26 08:12:56 +0000199#ifdef BB_SYSLOGD
200
Erik Andersene49d5ec2000-02-08 19:58:47 +0000201 /* Log the message to syslogd */
202 if (device & LOG) {
203 char msg[1024];
Eric Andersen4c781471999-11-26 08:12:56 +0000204
Erik Andersene49d5ec2000-02-08 19:58:47 +0000205 va_start(arguments, fmt);
206 vsnprintf(msg, sizeof(msg), fmt, arguments);
207 va_end(arguments);
Eric Andersen53cfb7e2001-01-31 17:29:47 +0000208 openlog(applet_name, 0, LOG_USER);
Erik Andersene132f4b2000-02-09 04:16:43 +0000209 syslog(LOG_USER|LOG_INFO, msg);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000210 closelog();
Eric Andersen3ae0c781999-11-04 01:13:21 +0000211 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000212#else
213 static int log_fd = -1;
214
215 /* Take full control of the log tty, and never close it.
216 * It's mine, all mine! Muhahahaha! */
217 if (log_fd < 0) {
218 if (log == NULL) {
219 /* don't even try to log, because there is no such console */
220 log_fd = -2;
221 /* log to main console instead */
222 device = CONSOLE;
Erik Andersene132f4b2000-02-09 04:16:43 +0000223 } else if ((log_fd = device_open(log, O_RDWR|O_NDELAY)) < 0) {
224 log_fd = -2;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000225 fprintf(stderr, "Bummer, can't write to log on %s!\r\n", log);
Erik Andersene132f4b2000-02-09 04:16:43 +0000226 log = NULL;
227 device = CONSOLE;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000228 }
229 }
230 if ((device & LOG) && (log_fd >= 0)) {
231 va_start(arguments, fmt);
232 vdprintf(log_fd, fmt, arguments);
233 va_end(arguments);
234 }
Eric Andersen4c781471999-11-26 08:12:56 +0000235#endif
236
Erik Andersene49d5ec2000-02-08 19:58:47 +0000237 if (device & CONSOLE) {
238 /* Always send console messages to /dev/console so people will see them. */
239 if (
240 (fd =
241 device_open(_PATH_CONSOLE,
242 O_WRONLY | O_NOCTTY | O_NDELAY)) >= 0) {
243 va_start(arguments, fmt);
244 vdprintf(fd, fmt, arguments);
245 va_end(arguments);
246 close(fd);
247 } else {
248 fprintf(stderr, "Bummer, can't print: ");
249 va_start(arguments, fmt);
250 vfprintf(stderr, fmt, arguments);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000251 va_end(arguments);
252 }
Eric Andersen3ae0c781999-11-04 01:13:21 +0000253 }
Eric Andersencc8ed391999-10-05 16:24:54 +0000254}
255
Eric Andersen0460ff21999-10-25 23:32:44 +0000256/* Set terminal settings to reasonable defaults */
Eric Andersen3e6ff902001-03-09 21:24:12 +0000257static void set_term(int fd)
Eric Andersencc8ed391999-10-05 16:24:54 +0000258{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000259 struct termios tty;
Eric Andersencc8ed391999-10-05 16:24:54 +0000260
Erik Andersene49d5ec2000-02-08 19:58:47 +0000261 tcgetattr(fd, &tty);
Eric Andersencc8ed391999-10-05 16:24:54 +0000262
Erik Andersene49d5ec2000-02-08 19:58:47 +0000263 /* set control chars */
Eric Andersen3849f9b2000-07-10 19:56:47 +0000264 tty.c_cc[VINTR] = 3; /* C-c */
265 tty.c_cc[VQUIT] = 28; /* C-\ */
266 tty.c_cc[VERASE] = 127; /* C-? */
267 tty.c_cc[VKILL] = 21; /* C-u */
268 tty.c_cc[VEOF] = 4; /* C-d */
269 tty.c_cc[VSTART] = 17; /* C-q */
270 tty.c_cc[VSTOP] = 19; /* C-s */
271 tty.c_cc[VSUSP] = 26; /* C-z */
Eric Andersen02bc25b2000-07-06 21:29:32 +0000272
Erik Andersene49d5ec2000-02-08 19:58:47 +0000273 /* use line dicipline 0 */
274 tty.c_line = 0;
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000275
Erik Andersene49d5ec2000-02-08 19:58:47 +0000276 /* Make it be sane */
Erik Andersen6c41c442000-03-19 05:13:49 +0000277 tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD;
Eric Andersend8862922001-04-23 15:14:11 +0000278 tty.c_cflag |= CREAD|HUPCL|CLOCAL;
279
Eric Andersen08b10341999-11-19 02:38:58 +0000280
Erik Andersene49d5ec2000-02-08 19:58:47 +0000281 /* input modes */
282 tty.c_iflag = ICRNL | IXON | IXOFF;
Eric Andersen08b10341999-11-19 02:38:58 +0000283
Erik Andersene49d5ec2000-02-08 19:58:47 +0000284 /* output modes */
285 tty.c_oflag = OPOST | ONLCR;
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000286
Erik Andersene49d5ec2000-02-08 19:58:47 +0000287 /* local modes */
288 tty.c_lflag =
289 ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN;
Eric Andersencc8ed391999-10-05 16:24:54 +0000290
Erik Andersene49d5ec2000-02-08 19:58:47 +0000291 tcsetattr(fd, TCSANOW, &tty);
Eric Andersencc8ed391999-10-05 16:24:54 +0000292}
293
Eric Andersenbc5941a2000-12-06 23:17:37 +0000294/* How much memory does this machine have?
295 Units are kBytes to avoid overflow on 4GB machines */
Erik Andersend07ee462000-02-21 21:26:32 +0000296static int check_free_memory()
Eric Andersencc8ed391999-10-05 16:24:54 +0000297{
Erik Andersend07ee462000-02-21 21:26:32 +0000298 struct sysinfo info;
Eric Andersenbc5941a2000-12-06 23:17:37 +0000299 unsigned int result, u, s=10;
Eric Andersencc8ed391999-10-05 16:24:54 +0000300
Erik Andersend07ee462000-02-21 21:26:32 +0000301 if (sysinfo(&info) != 0) {
Eric Andersen53cfb7e2001-01-31 17:29:47 +0000302 perror_msg("Error checking free memory");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000303 return -1;
Eric Andersenabc7d591999-10-19 00:27:50 +0000304 }
Eric Andersenbc5941a2000-12-06 23:17:37 +0000305
306 /* Kernels 2.0.x and 2.2.x return info.mem_unit==0 with values in bytes.
307 * Kernels 2.4.0 return info.mem_unit in bytes. */
308 u = info.mem_unit;
309 if (u==0) u=1;
310 while ( (u&1) == 0 && s > 0 ) { u>>=1; s--; }
311 result = (info.totalram>>s) + (info.totalswap>>s);
312 result = result*u;
313 if (result < 0) result = INT_MAX;
314 return result;
Eric Andersencc8ed391999-10-05 16:24:54 +0000315}
316
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000317static void console_init()
Eric Andersen0460ff21999-10-25 23:32:44 +0000318{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000319 int fd;
320 int tried_devcons = 0;
321 int tried_vtprimary = 0;
Erik Andersen029011b2000-03-04 21:19:32 +0000322 struct vt_stat vt;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000323 struct serial_struct sr;
324 char *s;
Eric Andersen0460ff21999-10-25 23:32:44 +0000325
Erik Andersene49d5ec2000-02-08 19:58:47 +0000326 if ((s = getenv("TERM")) != NULL) {
327 snprintf(termType, sizeof(termType) - 1, "TERM=%s", s);
328 }
Erik Andersenac6e71f2000-01-08 22:04:33 +0000329
Erik Andersene49d5ec2000-02-08 19:58:47 +0000330 if ((s = getenv("CONSOLE")) != NULL) {
Matt Kraai18447702001-05-18 21:24:58 +0000331 safe_strncpy(console, s, sizeof(console));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000332 }
Eric Andersenfbb39c81999-11-08 17:00:52 +0000333#if #cpu(sparc)
Erik Andersene49d5ec2000-02-08 19:58:47 +0000334 /* sparc kernel supports console=tty[ab] parameter which is also
335 * passed to init, so catch it here */
336 else if ((s = getenv("console")) != NULL) {
337 /* remap tty[ab] to /dev/ttyS[01] */
338 if (strcmp(s, "ttya") == 0)
Matt Kraai18447702001-05-18 21:24:58 +0000339 safe_strncpy(console, SERIAL_CON0, sizeof(console));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000340 else if (strcmp(s, "ttyb") == 0)
Matt Kraai18447702001-05-18 21:24:58 +0000341 safe_strncpy(console, SERIAL_CON1, sizeof(console));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000342 }
Eric Andersen219d6f51999-11-02 19:43:01 +0000343#endif
Erik Andersene49d5ec2000-02-08 19:58:47 +0000344 else {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000345 /* 2.2 kernels: identify the real console backend and try to use it */
346 if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
347 /* this is a serial console */
348 snprintf(console, sizeof(console) - 1, "/dev/ttyS%d", sr.line);
349 } else if (ioctl(0, VT_GETSTATE, &vt) == 0) {
350 /* this is linux virtual tty */
351 snprintf(console, sizeof(console) - 1, "/dev/tty%d",
352 vt.v_active);
353 } else {
Matt Kraai18447702001-05-18 21:24:58 +0000354 safe_strncpy(console, _PATH_CONSOLE, sizeof(console));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000355 tried_devcons++;
356 }
Eric Andersen07e52971999-11-07 07:38:08 +0000357 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000358
359 while ((fd = open(console, O_RDONLY | O_NONBLOCK)) < 0) {
360 /* Can't open selected console -- try /dev/console */
361 if (!tried_devcons) {
362 tried_devcons++;
Matt Kraai18447702001-05-18 21:24:58 +0000363 safe_strncpy(console, _PATH_CONSOLE, sizeof(console));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000364 continue;
365 }
366 /* Can't open selected console -- try vt1 */
367 if (!tried_vtprimary) {
368 tried_vtprimary++;
Matt Kraai18447702001-05-18 21:24:58 +0000369 safe_strncpy(console, VT_PRIMARY, sizeof(console));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000370 continue;
371 }
372 break;
373 }
374 if (fd < 0) {
375 /* Perhaps we should panic here? */
Matt Kraai18447702001-05-18 21:24:58 +0000376 safe_strncpy(console, "/dev/null", sizeof(console));
Eric Andersen07e52971999-11-07 07:38:08 +0000377 } else {
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000378 /* check for serial console and disable logging to tty5 & running a
379 * shell to tty2-4 */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000380 if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000381 log = NULL;
382 secondConsole = NULL;
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000383 thirdConsole = NULL;
384 fourthConsole = NULL;
Erik Andersenfa4718e2000-02-21 19:25:12 +0000385 /* Force the TERM setting to vt102 for serial console --
386 * iff TERM is set to linux (the default) */
387 if (strcmp( termType, "TERM=linux" ) == 0)
Matt Kraai18447702001-05-18 21:24:58 +0000388 safe_strncpy(termType, "TERM=vt102", sizeof(termType));
Erik Andersene132f4b2000-02-09 04:16:43 +0000389 message(LOG | CONSOLE,
390 "serial console detected. Disabling virtual terminals.\r\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000391 }
392 close(fd);
Eric Andersen07e52971999-11-07 07:38:08 +0000393 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000394 message(LOG, "console=%s\n", console);
Eric Andersen0460ff21999-10-25 23:32:44 +0000395}
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000396
397static void fixup_argv(int argc, char **argv, char *new_argv0)
398{
399 int len;
400 /* Fix up argv[0] to be certain we claim to be init */
401 len = strlen(argv[0]);
402 memset(argv[0], 0, len);
403 strncpy(argv[0], new_argv0, len);
404
405 /* Wipe argv[1]-argv[N] so they don't clutter the ps listing */
406 len = 1;
407 while (argc > len) {
408 memset(argv[len], 0, strlen(argv[len]));
409 len++;
410 }
411}
412
Eric Andersen0460ff21999-10-25 23:32:44 +0000413
Erik Andersene49d5ec2000-02-08 19:58:47 +0000414static pid_t run(char *command, char *terminal, int get_enter)
Eric Andersen0460ff21999-10-25 23:32:44 +0000415{
Eric Andersen7f197852001-03-16 01:14:04 +0000416 int i, j;
Eric Andersen477aedd2001-02-20 18:01:50 +0000417 int fd;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000418 pid_t pid;
Eric Andersen7f197852001-03-16 01:14:04 +0000419 char *tmpCmd, *s;
420 char *cmd[255], *cmdpath;
Erik Andersene132f4b2000-02-09 04:16:43 +0000421 char buf[255];
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000422 struct stat sb;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000423 static const char press_enter[] =
424
Eric Andersen38624232001-01-25 00:04:16 +0000425#ifdef CUSTOMIZED_BANNER
426#include CUSTOMIZED_BANNER
427#endif
428
Erik Andersene49d5ec2000-02-08 19:58:47 +0000429 "\nPlease press Enter to activate this console. ";
Eric Andersen477aedd2001-02-20 18:01:50 +0000430 char *environment[MAXENV+1] = {
Eric Andersen7f197852001-03-16 01:14:04 +0000431 termType,
Erik Andersene49d5ec2000-02-08 19:58:47 +0000432 "HOME=/",
433 "PATH=/usr/bin:/bin:/usr/sbin:/sbin",
434 "SHELL=/bin/sh",
Eric Andersen7f197852001-03-16 01:14:04 +0000435 "USER=root",
436 NULL
Erik Andersene49d5ec2000-02-08 19:58:47 +0000437 };
Erik Andersenac6e71f2000-01-08 22:04:33 +0000438
Eric Andersen7f197852001-03-16 01:14:04 +0000439 /* inherit environment to the child, merging our values -andy */
440 for (i=0; environ[i]; i++) {
441 for (j=0; environment[j]; j++) {
442 s = strchr(environment[j], '=');
443 if (!strncmp(environ[i], environment[j], s - environment[j]))
444 break;
445 }
446 if (!environment[j]) {
447 environment[j++] = environ[i];
448 environment[j] = NULL;
449 }
Eric Andersen477aedd2001-02-20 18:01:50 +0000450 }
451
Erik Andersene49d5ec2000-02-08 19:58:47 +0000452 if ((pid = fork()) == 0) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000453 /* Clean up */
Eric Andersenfb6a5082000-09-13 16:15:29 +0000454 ioctl(0, TIOCNOTTY, 0);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000455 close(0);
456 close(1);
457 close(2);
458 setsid();
Eric Andersen0460ff21999-10-25 23:32:44 +0000459
Erik Andersene49d5ec2000-02-08 19:58:47 +0000460 /* Reset signal handlers set for parent process */
461 signal(SIGUSR1, SIG_DFL);
462 signal(SIGUSR2, SIG_DFL);
463 signal(SIGINT, SIG_DFL);
464 signal(SIGTERM, SIG_DFL);
465 signal(SIGHUP, SIG_DFL);
Eric Andersen2f6c04f1999-11-01 23:59:44 +0000466
Erik Andersene49d5ec2000-02-08 19:58:47 +0000467 if ((fd = device_open(terminal, O_RDWR)) < 0) {
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000468 if (stat(terminal, &sb) != 0) {
Eric Andersen53f50612001-03-14 09:01:11 +0000469 message(LOG | CONSOLE, "device '%s' does not exist.\n",
470 terminal);
471 exit(1);
472 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000473 message(LOG | CONSOLE, "Bummer, can't open %s\r\n", terminal);
474 exit(1);
475 }
476 dup2(fd, 0);
477 dup2(fd, 1);
478 dup2(fd, 2);
Eric Andersenfb6a5082000-09-13 16:15:29 +0000479 ioctl(0, TIOCSCTTY, 1);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000480 tcsetpgrp(0, getpgrp());
481 set_term(0);
482
Erik Andersene132f4b2000-02-09 04:16:43 +0000483 /* See if any special /bin/sh requiring characters are present */
484 if (strpbrk(command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
485 cmd[0] = SHELL;
486 cmd[1] = "-c";
487 strcpy(buf, "exec ");
488 strncat(buf, command, sizeof(buf) - strlen(buf) - 1);
489 cmd[2] = buf;
490 cmd[3] = NULL;
491 } else {
492 /* Convert command (char*) into cmd (char**, one word per string) */
493 for (tmpCmd = command, i = 0;
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000494 (tmpCmd = strsep(&command, " \t")) != NULL;) {
Erik Andersene132f4b2000-02-09 04:16:43 +0000495 if (*tmpCmd != '\0') {
496 cmd[i] = tmpCmd;
497 tmpCmd++;
498 i++;
499 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000500 }
Erik Andersene132f4b2000-02-09 04:16:43 +0000501 cmd[i] = NULL;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000502 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000503
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000504 cmdpath = cmd[0];
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000505
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000506 /*
507 Interactive shells want to see a dash in argv[0]. This
508 typically is handled by login, argv will be setup this
509 way if a dash appears at the front of the command path
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000510 (like "-/bin/sh").
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000511 */
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000512
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000513 if (*cmdpath == '-') {
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000514
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000515 /* skip over the dash */
516 ++cmdpath;
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000517
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000518 /* find the last component in the command pathname */
519 s = get_last_path_component(cmdpath);
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000520
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000521 /* make a new argv[0] */
522 if ((cmd[0] = malloc(strlen(s)+2)) == NULL) {
523 message(LOG | CONSOLE, "malloc failed");
524 cmd[0] = cmdpath;
525 } else {
526 cmd[0][0] = '-';
527 strcpy(cmd[0]+1, s);
528 }
529 }
530
531 if (get_enter == TRUE) {
532 /*
533 * Save memory by not exec-ing anything large (like a shell)
534 * before the user wants it. This is critical if swap is not
535 * enabled and the system has low memory. Generally this will
536 * be run on the second virtual console, and the first will
537 * be allowed to start a shell or whatever an init script
538 * specifies.
539 */
540#ifdef DEBUG_INIT
541 message(LOG, "Waiting for enter to start '%s' (pid %d, console %s)\r\n",
542 cmd[0], getpid(), terminal);
543#endif
544 write(fileno(stdout), press_enter, sizeof(press_enter) - 1);
545 getc(stdin);
546 }
547
548#ifdef DEBUG_INIT
549 /* Log the process name and args */
550 message(LOG, "Starting pid %d, console %s: '%s'\r\n",
551 getpid(), terminal, command);
552#endif
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000553
Erik Andersen183da4a2000-04-04 18:36:37 +0000554#if defined BB_FEATURE_INIT_COREDUMPS
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000555 if (stat (CORE_ENABLE_FLAG_FILE, &sb) == 0) {
556 struct rlimit limit;
557 limit.rlim_cur = RLIM_INFINITY;
558 limit.rlim_max = RLIM_INFINITY;
559 setrlimit(RLIMIT_CORE, &limit);
Erik Andersen983b51b2000-04-04 18:14:25 +0000560 }
Erik Andersen183da4a2000-04-04 18:36:37 +0000561#endif
Erik Andersen983b51b2000-04-04 18:14:25 +0000562
Erik Andersene49d5ec2000-02-08 19:58:47 +0000563 /* Now run it. The new program will take over this PID,
564 * so nothing further in init.c should be run. */
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000565 execve(cmdpath, cmd, environment);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000566
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000567 /* We're still here? Some error happened. */
568 message(LOG | CONSOLE, "Bummer, could not run '%s': %s\n", cmdpath,
569 strerror(errno));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000570 exit(-1);
Erik Andersen05df2392000-01-13 04:43:48 +0000571 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000572 return pid;
Eric Andersen0460ff21999-10-25 23:32:44 +0000573}
574
Erik Andersene49d5ec2000-02-08 19:58:47 +0000575static int waitfor(char *command, char *terminal, int get_enter)
Erik Andersen0e3782f2000-01-07 02:54:55 +0000576{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000577 int status, wpid;
578 int pid = run(command, terminal, get_enter);
Erik Andersen0e3782f2000-01-07 02:54:55 +0000579
Erik Andersene49d5ec2000-02-08 19:58:47 +0000580 while (1) {
581 wpid = wait(&status);
Erik Andersene132f4b2000-02-09 04:16:43 +0000582 if (wpid > 0 && wpid != pid) {
583 continue;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000584 }
585 if (wpid == pid)
586 break;
Erik Andersen0e3782f2000-01-07 02:54:55 +0000587 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000588 return wpid;
Erik Andersen0e3782f2000-01-07 02:54:55 +0000589}
590
Eric Andersen219d6f51999-11-02 19:43:01 +0000591/* Make sure there is enough memory to do something useful. *
Erik Andersene132f4b2000-02-09 04:16:43 +0000592 * Calls "swapon -a" if needed so be sure /etc/fstab is present... */
Eric Andersen219d6f51999-11-02 19:43:01 +0000593static void check_memory()
594{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000595 struct stat statBuf;
Eric Andersen219d6f51999-11-02 19:43:01 +0000596
Erik Andersend07ee462000-02-21 21:26:32 +0000597 if (check_free_memory() > 1000)
Erik Andersene49d5ec2000-02-08 19:58:47 +0000598 return;
599
600 if (stat("/etc/fstab", &statBuf) == 0) {
Erik Andersen61677fe2000-04-13 01:18:56 +0000601 /* swapon -a requires /proc typically */
602 waitfor("mount proc /proc -t proc", console, FALSE);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000603 /* Try to turn on swap */
Erik Andersen61677fe2000-04-13 01:18:56 +0000604 waitfor("swapon -a", console, FALSE);
Erik Andersend07ee462000-02-21 21:26:32 +0000605 if (check_free_memory() < 1000)
Erik Andersene49d5ec2000-02-08 19:58:47 +0000606 goto goodnight;
607 } else
608 goto goodnight;
Eric Andersen219d6f51999-11-02 19:43:01 +0000609 return;
610
Erik Andersene49d5ec2000-02-08 19:58:47 +0000611 goodnight:
612 message(CONSOLE,
613 "Sorry, your computer does not have enough memory.\r\n");
614 while (1)
615 sleep(1);
Eric Andersen219d6f51999-11-02 19:43:01 +0000616}
617
Erik Andersene132f4b2000-02-09 04:16:43 +0000618/* Run all commands to be run right before halt/reboot */
Eric Andersenc97ec342001-04-03 18:01:51 +0000619static void run_actions(initActionEnum action)
Erik Andersene132f4b2000-02-09 04:16:43 +0000620{
Eric Andersen0d4e51d2001-03-15 19:18:21 +0000621 initAction *a, *tmp;
Eric Andersena4edd0e2001-03-15 21:04:18 +0000622 for (a = initActionList; a; a = tmp) {
623 tmp = a->nextPtr;
Eric Andersenc97ec342001-04-03 18:01:51 +0000624 if (a->action == action) {
Erik Andersene132f4b2000-02-09 04:16:43 +0000625 waitfor(a->process, a->console, FALSE);
626 delete_initAction(a);
627 }
628 }
629}
630
631
Erik Andersen7dc16072000-01-04 01:10:25 +0000632#ifndef DEBUG_INIT
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000633static void shutdown_system(void)
Eric Andersencc8ed391999-10-05 16:24:54 +0000634{
Erik Andersene132f4b2000-02-09 04:16:43 +0000635
Erik Andersene49d5ec2000-02-08 19:58:47 +0000636 /* first disable our SIGHUP signal */
637 signal(SIGHUP, SIG_DFL);
Erik Andersen7dc16072000-01-04 01:10:25 +0000638
Erik Andersene49d5ec2000-02-08 19:58:47 +0000639 /* Allow Ctrl-Alt-Del to reboot system. */
Erik Andersen4f3f7572000-04-28 00:18:56 +0000640 init_reboot(RB_ENABLE_CAD);
Erik Andersene132f4b2000-02-09 04:16:43 +0000641
642 message(CONSOLE|LOG, "\r\nThe system is going down NOW !!\r\n");
Eric Andersencf8c9cf1999-11-05 00:31:46 +0000643 sync();
Erik Andersene49d5ec2000-02-08 19:58:47 +0000644
645 /* Send signals to every process _except_ pid 1 */
Erik Andersene132f4b2000-02-09 04:16:43 +0000646 message(CONSOLE|LOG, "Sending SIGTERM to all processes.\r\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000647 kill(-1, SIGTERM);
Erik Andersene132f4b2000-02-09 04:16:43 +0000648 sleep(1);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000649 sync();
650
Erik Andersene132f4b2000-02-09 04:16:43 +0000651 message(CONSOLE|LOG, "Sending SIGKILL to all processes.\r\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000652 kill(-1, SIGKILL);
Erik Andersene132f4b2000-02-09 04:16:43 +0000653 sleep(1);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000654
Matt Kraai8fc364e2001-04-12 20:12:16 +0000655 /* run everything to be run at "shutdown" */
Eric Andersenc97ec342001-04-03 18:01:51 +0000656 run_actions(SHUTDOWN);
Erik Andersene132f4b2000-02-09 04:16:43 +0000657
Erik Andersene49d5ec2000-02-08 19:58:47 +0000658 sync();
Eric Andersenbd22ed82000-07-08 18:55:24 +0000659 if (kernelVersion > 0 && kernelVersion <= KERNEL_VERSION(2,2,11)) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000660 /* bdflush, kupdate not needed for kernels >2.2.11 */
661 bdflush(1, 0);
662 sync();
663 }
Eric Andersencc8ed391999-10-05 16:24:54 +0000664}
665
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000666static void halt_signal(int sig)
Eric Andersencc8ed391999-10-05 16:24:54 +0000667{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000668 shutdown_system();
Erik Andersene132f4b2000-02-09 04:16:43 +0000669 message(CONSOLE|LOG,
Erik Andersene49d5ec2000-02-08 19:58:47 +0000670 "The system is halted. Press %s or turn off power\r\n",
671 (secondConsole == NULL) /* serial console */
672 ? "Reset" : "CTRL-ALT-DEL");
673 sync();
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000674
Erik Andersene49d5ec2000-02-08 19:58:47 +0000675 /* allow time for last message to reach serial console */
Erik Andersene132f4b2000-02-09 04:16:43 +0000676 sleep(2);
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000677
Eric Andersenbd22ed82000-07-08 18:55:24 +0000678 if (sig == SIGUSR2 && kernelVersion >= KERNEL_VERSION(2,2,0))
Erik Andersen4f3f7572000-04-28 00:18:56 +0000679 init_reboot(RB_POWER_OFF);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000680 else
Erik Andersen4f3f7572000-04-28 00:18:56 +0000681 init_reboot(RB_HALT_SYSTEM);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000682 exit(0);
Eric Andersencc8ed391999-10-05 16:24:54 +0000683}
684
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000685static void reboot_signal(int sig)
Eric Andersencc8ed391999-10-05 16:24:54 +0000686{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000687 shutdown_system();
Erik Andersene132f4b2000-02-09 04:16:43 +0000688 message(CONSOLE|LOG, "Please stand by while rebooting the system.\r\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000689 sync();
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000690
Erik Andersene49d5ec2000-02-08 19:58:47 +0000691 /* allow time for last message to reach serial console */
692 sleep(2);
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000693
Erik Andersen4f3f7572000-04-28 00:18:56 +0000694 init_reboot(RB_AUTOBOOT);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000695 exit(0);
Eric Andersencc8ed391999-10-05 16:24:54 +0000696}
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000697
Eric Andersenc97ec342001-04-03 18:01:51 +0000698static void ctrlaltdel_signal(int sig)
699{
700 run_actions(CTRLALTDEL);
701}
702
Erik Andersene49d5ec2000-02-08 19:58:47 +0000703#endif /* ! DEBUG_INIT */
Erik Andersende552872000-01-23 01:34:05 +0000704
Eric Andersen3e6ff902001-03-09 21:24:12 +0000705static void new_initAction(initActionEnum action, char *process, char *cons)
Erik Andersen7dc16072000-01-04 01:10:25 +0000706{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000707 initAction *newAction;
Erik Andersen9e737252000-01-06 01:16:13 +0000708
Erik Andersene49d5ec2000-02-08 19:58:47 +0000709 if (*cons == '\0')
710 cons = console;
Erik Andersen9e737252000-01-06 01:16:13 +0000711
Erik Andersene49d5ec2000-02-08 19:58:47 +0000712 /* If BusyBox detects that a serial console is in use,
713 * then entries not refering to the console or null devices will _not_ be run.
714 * The exception to this rule is the null device.
715 */
716 if (secondConsole == NULL && strcmp(cons, console)
717 && strcmp(cons, "/dev/null"))
718 return;
719
720 newAction = calloc((size_t) (1), sizeof(initAction));
721 if (!newAction) {
722 message(LOG | CONSOLE, "Memory allocation failure\n");
723 while (1)
724 sleep(1);
725 }
726 newAction->nextPtr = initActionList;
727 initActionList = newAction;
728 strncpy(newAction->process, process, 255);
729 newAction->action = action;
730 strncpy(newAction->console, cons, 255);
731 newAction->pid = 0;
Erik Andersen31638212000-01-15 22:28:50 +0000732// message(LOG|CONSOLE, "process='%s' action='%d' console='%s'\n",
Erik Andersene49d5ec2000-02-08 19:58:47 +0000733// newAction->process, newAction->action, newAction->console);
Erik Andersen7dc16072000-01-04 01:10:25 +0000734}
735
Erik Andersene132f4b2000-02-09 04:16:43 +0000736static void delete_initAction(initAction * action)
Erik Andersen7dc16072000-01-04 01:10:25 +0000737{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000738 initAction *a, *b = NULL;
739
740 for (a = initActionList; a; b = a, a = a->nextPtr) {
741 if (a == action) {
742 if (b == NULL) {
743 initActionList = a->nextPtr;
744 } else {
745 b->nextPtr = a->nextPtr;
746 }
747 free(a);
748 break;
749 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000750 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000751}
752
Erik Andersen9e737252000-01-06 01:16:13 +0000753/* NOTE that if BB_FEATURE_USE_INITTAB is NOT defined,
754 * then parse_inittab() simply adds in some default
755 * actions(i.e runs INIT_SCRIPT and then starts a pair
Erik Andersen812d4662000-01-07 18:30:40 +0000756 * of "askfirst" shells). If BB_FEATURE_USE_INITTAB
757 * _is_ defined, but /etc/inittab is missing, this
758 * results in the same set of default behaviors.
Erik Andersen9e737252000-01-06 01:16:13 +0000759 * */
Eric Andersen3e6ff902001-03-09 21:24:12 +0000760static void parse_inittab(void)
Erik Andersen7dc16072000-01-04 01:10:25 +0000761{
Erik Andersen9e737252000-01-06 01:16:13 +0000762#ifdef BB_FEATURE_USE_INITTAB
Erik Andersene49d5ec2000-02-08 19:58:47 +0000763 FILE *file;
764 char buf[256], lineAsRead[256], tmpConsole[256];
Eric Andersenb5966362000-05-31 20:04:38 +0000765 char *id, *runlev, *action, *process, *eol;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000766 const struct initActionType *a = actions;
767 int foundIt;
Erik Andersen7dc16072000-01-04 01:10:25 +0000768
769
Erik Andersene49d5ec2000-02-08 19:58:47 +0000770 file = fopen(INITTAB, "r");
771 if (file == NULL) {
772 /* No inittab file -- set up some default behavior */
Erik Andersen9e737252000-01-06 01:16:13 +0000773#endif
Eric Andersenc97ec342001-04-03 18:01:51 +0000774 /* Reboot on Ctrl-Alt-Del */
775 new_initAction(CTRLALTDEL, "/sbin/reboot", console);
Erik Andersene132f4b2000-02-09 04:16:43 +0000776 /* Swapoff on halt/reboot */
Eric Andersenc97ec342001-04-03 18:01:51 +0000777 new_initAction(SHUTDOWN, "/sbin/swapoff -a", console);
Erik Andersene132f4b2000-02-09 04:16:43 +0000778 /* Umount all filesystems on halt/reboot */
Eric Andersenc97ec342001-04-03 18:01:51 +0000779 new_initAction(SHUTDOWN, "/bin/umount -a -r", console);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000780 /* Askfirst shell on tty1 */
781 new_initAction(ASKFIRST, SHELL, console);
782 /* Askfirst shell on tty2 */
783 if (secondConsole != NULL)
784 new_initAction(ASKFIRST, SHELL, secondConsole);
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000785 /* Askfirst shell on tty3 */
786 if (thirdConsole != NULL)
787 new_initAction(ASKFIRST, SHELL, thirdConsole);
788 /* Askfirst shell on tty4 */
789 if (fourthConsole != NULL)
790 new_initAction(ASKFIRST, SHELL, fourthConsole);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000791 /* sysinit */
792 new_initAction(SYSINIT, INIT_SCRIPT, console);
Erik Andersen7dc16072000-01-04 01:10:25 +0000793
Erik Andersene49d5ec2000-02-08 19:58:47 +0000794 return;
Erik Andersen9e737252000-01-06 01:16:13 +0000795#ifdef BB_FEATURE_USE_INITTAB
Erik Andersen9e737252000-01-06 01:16:13 +0000796 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000797
Erik Andersene49d5ec2000-02-08 19:58:47 +0000798 while (fgets(buf, 255, file) != NULL) {
799 foundIt = FALSE;
Eric Andersenb5966362000-05-31 20:04:38 +0000800 /* Skip leading spaces */
801 for (id = buf; *id == ' ' || *id == '\t'; id++);
802
803 /* Skip the line if it's a comment */
804 if (*id == '#' || *id == '\n')
Erik Andersene49d5ec2000-02-08 19:58:47 +0000805 continue;
Erik Andersen7dc16072000-01-04 01:10:25 +0000806
Erik Andersene49d5ec2000-02-08 19:58:47 +0000807 /* Trim the trailing \n */
Eric Andersenb5966362000-05-31 20:04:38 +0000808 eol = strrchr(id, '\n');
809 if (eol != NULL)
810 *eol = '\0';
Erik Andersen7dc16072000-01-04 01:10:25 +0000811
Erik Andersene49d5ec2000-02-08 19:58:47 +0000812 /* Keep a copy around for posterity's sake (and error msgs) */
813 strcpy(lineAsRead, buf);
814
Eric Andersenb5966362000-05-31 20:04:38 +0000815 /* Separate the ID field from the runlevels */
816 runlev = strchr(id, ':');
817 if (runlev == NULL || *(runlev + 1) == '\0') {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000818 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
819 continue;
820 } else {
Eric Andersenb5966362000-05-31 20:04:38 +0000821 *runlev = '\0';
822 ++runlev;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000823 }
824
Eric Andersenb5966362000-05-31 20:04:38 +0000825 /* Separate the runlevels from the action */
826 action = strchr(runlev, ':');
827 if (action == NULL || *(action + 1) == '\0') {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000828 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
829 continue;
830 } else {
Eric Andersenb5966362000-05-31 20:04:38 +0000831 *action = '\0';
832 ++action;
833 }
834
835 /* Separate the action from the process */
836 process = strchr(action, ':');
837 if (process == NULL || *(process + 1) == '\0') {
838 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
839 continue;
840 } else {
841 *process = '\0';
842 ++process;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000843 }
844
845 /* Ok, now process it */
846 a = actions;
847 while (a->name != 0) {
Eric Andersenb5966362000-05-31 20:04:38 +0000848 if (strcmp(a->name, action) == 0) {
849 if (*id != '\0') {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000850 strcpy(tmpConsole, "/dev/");
Eric Andersenb5966362000-05-31 20:04:38 +0000851 strncat(tmpConsole, id, 200);
Eric Andersenb5966362000-05-31 20:04:38 +0000852 id = tmpConsole;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000853 }
Eric Andersenb5966362000-05-31 20:04:38 +0000854 new_initAction(a->action, process, id);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000855 foundIt = TRUE;
856 }
857 a++;
858 }
859 if (foundIt == TRUE)
860 continue;
861 else {
862 /* Choke on an unknown action */
863 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
864 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000865 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000866 return;
Erik Andersen42094cd2000-03-20 21:34:52 +0000867#endif /* BB_FEATURE_USE_INITTAB */
Erik Andersen7dc16072000-01-04 01:10:25 +0000868}
869
Erik Andersene132f4b2000-02-09 04:16:43 +0000870
871
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000872extern int init_main(int argc, char **argv)
Eric Andersen0460ff21999-10-25 23:32:44 +0000873{
Eric Andersen0d4e51d2001-03-15 19:18:21 +0000874 initAction *a, *tmp;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000875 pid_t wpid;
876 int status;
Eric Andersen0460ff21999-10-25 23:32:44 +0000877
Eric Andersend73dc5b1999-11-10 23:13:02 +0000878#ifndef DEBUG_INIT
Erik Andersena51ecdd2000-02-24 18:09:58 +0000879 /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
880 if (getpid() != 1
881#ifdef BB_FEATURE_LINUXRC
Matt Kraaie58771e2000-07-12 15:38:49 +0000882 && strstr(applet_name, "linuxrc") == NULL
Erik Andersena51ecdd2000-02-24 18:09:58 +0000883#endif
884 )
885 {
Eric Andersen67991cf2001-02-14 21:23:06 +0000886 show_usage();
Erik Andersene49d5ec2000-02-08 19:58:47 +0000887 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000888 /* Set up sig handlers -- be sure to
889 * clear all of these in run() */
890 signal(SIGUSR1, halt_signal);
Eric Andersen4c95a282000-07-07 19:30:28 +0000891 signal(SIGUSR2, halt_signal);
Eric Andersenc97ec342001-04-03 18:01:51 +0000892 signal(SIGINT, ctrlaltdel_signal);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000893 signal(SIGTERM, reboot_signal);
Eric Andersen0460ff21999-10-25 23:32:44 +0000894
Erik Andersene49d5ec2000-02-08 19:58:47 +0000895 /* Turn off rebooting via CTL-ALT-DEL -- we get a
896 * SIGINT on CAD so we can shut things down gracefully... */
Erik Andersen4f3f7572000-04-28 00:18:56 +0000897 init_reboot(RB_DISABLE_CAD);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000898#endif
Erik Andersen05df2392000-01-13 04:43:48 +0000899
Erik Andersen298854f2000-03-23 01:09:18 +0000900 /* Figure out what kernel this is running */
901 kernelVersion = get_kernel_revision();
902
Erik Andersene49d5ec2000-02-08 19:58:47 +0000903 /* Figure out where the default console should be */
904 console_init();
Eric Andersen0460ff21999-10-25 23:32:44 +0000905
Erik Andersene49d5ec2000-02-08 19:58:47 +0000906 /* Close whatever files are open, and reset the console. */
907 close(0);
908 close(1);
909 close(2);
910 set_term(0);
Erik Andersen983b51b2000-04-04 18:14:25 +0000911 chdir("/");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000912 setsid();
Eric Andersencc8ed391999-10-05 16:24:54 +0000913
Erik Andersene49d5ec2000-02-08 19:58:47 +0000914 /* Make sure PATH is set to something sane */
Eric Andersen452fd332001-03-04 06:47:33 +0000915 putenv("PATH="_PATH_STDPATH);
Eric Andersencc8ed391999-10-05 16:24:54 +0000916
Erik Andersene49d5ec2000-02-08 19:58:47 +0000917 /* Hello world */
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000918#ifndef DEBUG_INIT
Erik Andersenea6b67d2000-03-07 07:47:10 +0000919 message(
920#if ! defined BB_FEATURE_EXTRA_QUIET
921 CONSOLE|
922#endif
923 LOG,
Pavel Roskin9c5fcc32000-07-17 23:45:12 +0000924 "init started: %s\r\n", full_version);
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000925#else
Erik Andersenea6b67d2000-03-07 07:47:10 +0000926 message(
927#if ! defined BB_FEATURE_EXTRA_QUIET
928 CONSOLE|
929#endif
930 LOG,
Pavel Roskin9c5fcc32000-07-17 23:45:12 +0000931 "init(%d) started: %s\r\n", getpid(), full_version);
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000932#endif
Eric Andersencc8ed391999-10-05 16:24:54 +0000933
Eric Andersencc8ed391999-10-05 16:24:54 +0000934
Erik Andersene49d5ec2000-02-08 19:58:47 +0000935 /* Make sure there is enough memory to do something useful. */
936 check_memory();
Erik Andersen9e737252000-01-06 01:16:13 +0000937
Erik Andersene49d5ec2000-02-08 19:58:47 +0000938 /* Check if we are supposed to be in single user mode */
939 if (argc > 1 && (!strcmp(argv[1], "single") ||
940 !strcmp(argv[1], "-s") || !strcmp(argv[1], "1"))) {
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000941 /* Ask first then start a shell on tty2-4 */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000942 if (secondConsole != NULL)
943 new_initAction(ASKFIRST, SHELL, secondConsole);
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000944 if (thirdConsole != NULL)
945 new_initAction(ASKFIRST, SHELL, thirdConsole);
946 if (fourthConsole != NULL)
947 new_initAction(ASKFIRST, SHELL, fourthConsole);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000948 /* Start a shell on tty1 */
949 new_initAction(RESPAWN, SHELL, console);
950 } else {
951 /* Not in single user mode -- see what inittab says */
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000952
Erik Andersene49d5ec2000-02-08 19:58:47 +0000953 /* NOTE that if BB_FEATURE_USE_INITTAB is NOT defined,
954 * then parse_inittab() simply adds in some default
955 * actions(i.e runs INIT_SCRIPT and then starts a pair
956 * of "askfirst" shells */
957 parse_inittab();
Eric Andersend00c2621999-12-07 08:37:31 +0000958 }
Erik Andersen983b51b2000-04-04 18:14:25 +0000959
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000960 /* Make the command line just say "init" -- thats all, nothing else */
961 fixup_argv(argc, argv, "init");
Eric Andersen219d6f51999-11-02 19:43:01 +0000962
Erik Andersene49d5ec2000-02-08 19:58:47 +0000963 /* Now run everything that needs to be run */
964
965 /* First run the sysinit command */
Eric Andersena4edd0e2001-03-15 21:04:18 +0000966 for (a = initActionList; a; a = tmp) {
967 tmp = a->nextPtr;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000968 if (a->action == SYSINIT) {
969 waitfor(a->process, a->console, FALSE);
970 /* Now remove the "sysinit" entry from the list */
971 delete_initAction(a);
Erik Andersen7dc16072000-01-04 01:10:25 +0000972 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000973 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000974 /* Next run anything that wants to block */
Eric Andersena4edd0e2001-03-15 21:04:18 +0000975 for (a = initActionList; a; a = tmp) {
976 tmp = a->nextPtr;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000977 if (a->action == WAIT) {
978 waitfor(a->process, a->console, FALSE);
979 /* Now remove the "wait" entry from the list */
980 delete_initAction(a);
Erik Andersen7dc16072000-01-04 01:10:25 +0000981 }
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000982 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000983 /* Next run anything to be run only once */
Eric Andersena4edd0e2001-03-15 21:04:18 +0000984 for (a = initActionList; a; a = tmp) {
985 tmp = a->nextPtr;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000986 if (a->action == ONCE) {
987 run(a->process, a->console, FALSE);
988 /* Now remove the "once" entry from the list */
989 delete_initAction(a);
990 }
991 }
992 /* If there is nothing else to do, stop */
993 if (initActionList == NULL) {
994 message(LOG | CONSOLE,
995 "No more tasks for init -- sleeping forever.\n");
996 while (1)
997 sleep(1);
998 }
999
1000 /* Now run the looping stuff for the rest of forever */
1001 while (1) {
1002 for (a = initActionList; a; a = a->nextPtr) {
1003 /* Only run stuff with pid==0. If they have
1004 * a pid, that means they are still running */
1005 if (a->pid == 0) {
1006 switch (a->action) {
1007 case RESPAWN:
1008 /* run the respawn stuff */
1009 a->pid = run(a->process, a->console, FALSE);
1010 break;
1011 case ASKFIRST:
1012 /* run the askfirst stuff */
1013 a->pid = run(a->process, a->console, TRUE);
1014 break;
1015 /* silence the compiler's incessant whining */
1016 default:
1017 break;
1018 }
1019 }
1020 }
1021 /* Wait for a child process to exit */
1022 wpid = wait(&status);
1023 if (wpid > 0) {
1024 /* Find out who died and clean up their corpse */
1025 for (a = initActionList; a; a = a->nextPtr) {
1026 if (a->pid == wpid) {
1027 a->pid = 0;
1028 message(LOG,
1029 "Process '%s' (pid %d) exited. Scheduling it for restart.\n",
1030 a->process, wpid);
1031 }
1032 }
1033 }
1034 sleep(1);
1035 }
Eric Andersencc8ed391999-10-05 16:24:54 +00001036}
Erik Andersen029011b2000-03-04 21:19:32 +00001037
1038/*
1039Local Variables:
1040c-file-style: "linux"
1041c-basic-offset: 4
1042tab-width: 4
1043End:
1044*/