blob: eb1b2c5059c5fe5c8d17d653ef29608265f99711 [file] [log] [blame]
Erik Andersenccc74882000-01-27 02:40:21 +00001/* vi: set sw=4 ts=4: */
Eric Andersenc4996011999-10-20 22:08:37 +00002/*
3 * Mini init implementation for busybox
4 *
5 *
6 * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
7 * Adjusted by so many folks, it's impossible to keep track.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 *
23 */
24
Erik Andersene132f4b2000-02-09 04:16:43 +000025/* Turn this on to disable all the dangerous
26 rebooting stuff when debugging.
27#define DEBUG_INIT
28*/
29
Erik Andersen4f3f7572000-04-28 00:18:56 +000030#include <stdio.h>
31#include <stdlib.h>
Eric Andersencc8ed391999-10-05 16:24:54 +000032#include <errno.h>
Eric Andersenb186d981999-12-03 09:19:54 +000033#include <paths.h>
Erik Andersen42094cd2000-03-20 21:34:52 +000034#include <signal.h>
35#include <stdarg.h>
Eric Andersencc8ed391999-10-05 16:24:54 +000036#include <string.h>
Erik Andersen4f3f7572000-04-28 00:18:56 +000037#include <termios.h>
38#include <unistd.h>
Eric Andersened3ef502001-01-27 08:24:39 +000039#include <limits.h>
Erik Andersen42094cd2000-03-20 21:34:52 +000040#include <sys/fcntl.h>
41#include <sys/ioctl.h>
Eric Andersencc8ed391999-10-05 16:24:54 +000042#include <sys/mount.h>
Erik Andersen42094cd2000-03-20 21:34:52 +000043#include <sys/types.h>
Erik Andersen42094cd2000-03-20 21:34:52 +000044#include <sys/wait.h>
Eric Andersencbe31da2001-02-20 06:14:08 +000045#include "busybox.h"
46#define bb_need_full_version
47#define BB_DECLARE_EXTERN
48#include "messages.c"
Erik Andersen4f3f7572000-04-28 00:18:56 +000049#ifdef BB_SYSLOGD
50# include <sys/syslog.h>
51#endif
52
Pavel Roskin9c5fcc32000-07-17 23:45:12 +000053
Eric Andersenbd22ed82000-07-08 18:55:24 +000054/* From <linux/vt.h> */
55struct vt_stat {
56 unsigned short v_active; /* active vt */
57 unsigned short v_signal; /* signal to send */
58 unsigned short v_state; /* vt bitmask */
59};
Mark Whitley59ab0252001-01-23 22:30:04 +000060static const int VT_GETSTATE = 0x5603; /* get global vt state info */
Eric Andersenbd22ed82000-07-08 18:55:24 +000061
62/* From <linux/serial.h> */
63struct serial_struct {
64 int type;
65 int line;
66 int port;
67 int irq;
68 int flags;
69 int xmit_fifo_size;
70 int custom_divisor;
71 int baud_base;
72 unsigned short close_delay;
73 char reserved_char[2];
74 int hub6;
75 unsigned short closing_wait; /* time to wait before closing */
76 unsigned short closing_wait2; /* no longer used... */
77 int reserved[4];
78};
79
80
Erik Andersen4f3f7572000-04-28 00:18:56 +000081
82#ifndef RB_HALT_SYSTEM
Mark Whitley59ab0252001-01-23 22:30:04 +000083static const int RB_HALT_SYSTEM = 0xcdef0123;
84static const int RB_ENABLE_CAD = 0x89abcdef;
85static const int RB_DISABLE_CAD = 0;
Erik Andersen4f3f7572000-04-28 00:18:56 +000086#define RB_POWER_OFF 0x4321fedc
Mark Whitley59ab0252001-01-23 22:30:04 +000087static const int RB_AUTOBOOT = 0x01234567;
Eric Andersene3a48d82000-12-12 23:22:35 +000088#if defined(__GLIBC__) || defined (__UCLIBC__)
Erik Andersen4f3f7572000-04-28 00:18:56 +000089#include <sys/reboot.h>
90 #define init_reboot(magic) reboot(magic)
91#else
92 #define init_reboot(magic) reboot(0xfee1dead, 672274793, magic)
93#endif
94#endif
95
Eric Andersen41492d62001-02-23 00:05:56 +000096#ifndef _PATH_STDPATH
Erik Andersen4f3f7572000-04-28 00:18:56 +000097#define _PATH_STDPATH "/usr/bin:/bin:/usr/sbin:/sbin"
Eric Andersen41492d62001-02-23 00:05:56 +000098#endif
Eric Andersencc8ed391999-10-05 16:24:54 +000099
Erik Andersen983b51b2000-04-04 18:14:25 +0000100
Erik Andersen183da4a2000-04-04 18:36:37 +0000101#if defined BB_FEATURE_INIT_COREDUMPS
Erik Andersen983b51b2000-04-04 18:14:25 +0000102/*
Erik Andersen183da4a2000-04-04 18:36:37 +0000103 * When a file named CORE_ENABLE_FLAG_FILE exists, setrlimit is called
104 * before processes are spawned to set core file size as unlimited.
105 * This is for debugging only. Don't use this is production, unless
106 * you want core dumps lying about....
Erik Andersen983b51b2000-04-04 18:14:25 +0000107 */
108#define CORE_ENABLE_FLAG_FILE "/.init_enable_core"
109#include <sys/resource.h>
110#include <sys/time.h>
Erik Andersen183da4a2000-04-04 18:36:37 +0000111#endif
Erik Andersen983b51b2000-04-04 18:14:25 +0000112
Erik Andersen4d1d0111999-12-17 18:44:15 +0000113#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
Erik Andersen4d1d0111999-12-17 18:44:15 +0000114
Erik Andersen4f3f7572000-04-28 00:18:56 +0000115#if defined(__GLIBC__)
116#include <sys/kdaemon.h>
117#else
Eric Andersened3ef502001-01-27 08:24:39 +0000118#include <sys/syscall.h>
119#include <linux/unistd.h>
Eric Andersena15cd0b2000-06-19 18:14:20 +0000120static _syscall2(int, bdflush, int, func, int, data);
Erik Andersen4f3f7572000-04-28 00:18:56 +0000121#endif /* __GLIBC__ */
122
Eric Andersen0ecb54a1999-12-05 23:24:55 +0000123
Erik Andersen42094cd2000-03-20 21:34:52 +0000124#define VT_PRIMARY "/dev/tty1" /* Primary virtual console */
125#define VT_SECONDARY "/dev/tty2" /* Virtual console */
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000126#define VT_THIRD "/dev/tty3" /* Virtual console */
127#define VT_FOURTH "/dev/tty4" /* Virtual console */
128#define VT_LOG "/dev/tty5" /* Virtual console */
Erik Andersen42094cd2000-03-20 21:34:52 +0000129#define SERIAL_CON0 "/dev/ttyS0" /* Primary serial console */
130#define SERIAL_CON1 "/dev/ttyS1" /* Serial console */
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000131#define SHELL "-/bin/sh" /* Default shell */
Erik Andersen42094cd2000-03-20 21:34:52 +0000132#define INITTAB "/etc/inittab" /* inittab file location */
Erik Andersen96e2abd2000-01-07 11:40:44 +0000133#ifndef INIT_SCRIPT
Erik Andersen42094cd2000-03-20 21:34:52 +0000134#define INIT_SCRIPT "/etc/init.d/rcS" /* Default sysinit script. */
Erik Andersen96e2abd2000-01-07 11:40:44 +0000135#endif
Erik Andersen9c88cac1999-12-30 09:25:17 +0000136
Eric Andersen41492d62001-02-23 00:05:56 +0000137#define MAXENV 16 /* Number of env. vars */
138//static const int MAXENV = 16; /* Number of env. vars */
Mark Whitley59ab0252001-01-23 22:30:04 +0000139static const int LOG = 0x1;
140static const int CONSOLE = 0x2;
Erik Andersen7dc16072000-01-04 01:10:25 +0000141
142/* Allowed init action types */
143typedef enum {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000144 SYSINIT = 1,
145 RESPAWN,
146 ASKFIRST,
147 WAIT,
Erik Andersene132f4b2000-02-09 04:16:43 +0000148 ONCE,
149 CTRLALTDEL
Erik Andersen7dc16072000-01-04 01:10:25 +0000150} initActionEnum;
151
Erik Andersen42094cd2000-03-20 21:34:52 +0000152/* A mapping between "inittab" action name strings and action type codes. */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000153typedef struct initActionType {
154 const char *name;
155 initActionEnum action;
Erik Andersen7dc16072000-01-04 01:10:25 +0000156} initActionType;
157
158static const struct initActionType actions[] = {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000159 {"sysinit", SYSINIT},
160 {"respawn", RESPAWN},
161 {"askfirst", ASKFIRST},
162 {"wait", WAIT},
163 {"once", ONCE},
Erik Andersene132f4b2000-02-09 04:16:43 +0000164 {"ctrlaltdel", CTRLALTDEL},
Pavel Roskin9027bcf2000-07-14 15:44:25 +0000165 {0, 0}
Erik Andersen7dc16072000-01-04 01:10:25 +0000166};
167
Erik Andersen42094cd2000-03-20 21:34:52 +0000168/* Set up a linked list of initActions, to be read from inittab */
Erik Andersen7dc16072000-01-04 01:10:25 +0000169typedef struct initActionTag initAction;
170struct initActionTag {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000171 pid_t pid;
172 char process[256];
173 char console[256];
174 initAction *nextPtr;
175 initActionEnum action;
Erik Andersen7dc16072000-01-04 01:10:25 +0000176};
Eric Andersen3e6ff902001-03-09 21:24:12 +0000177static initAction *initActionList = NULL;
Erik Andersen7dc16072000-01-04 01:10:25 +0000178
179
Erik Andersenac6e71f2000-01-08 22:04:33 +0000180static char *secondConsole = VT_SECONDARY;
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000181static char *thirdConsole = VT_THIRD;
182static char *fourthConsole = VT_FOURTH;
Erik Andersen42094cd2000-03-20 21:34:52 +0000183static char *log = VT_LOG;
184static int kernelVersion = 0;
185static char termType[32] = "TERM=linux";
186static char console[32] = _PATH_CONSOLE;
187
Erik Andersene132f4b2000-02-09 04:16:43 +0000188static void delete_initAction(initAction * action);
Eric Andersen0460ff21999-10-25 23:32:44 +0000189
190
Erik Andersen42094cd2000-03-20 21:34:52 +0000191/* Print a message to the specified device.
192 * Device may be bitwise-or'd from LOG | CONSOLE */
193static void message(int device, char *fmt, ...)
Erik Andersen93d65132000-04-06 08:06:36 +0000194 __attribute__ ((format (printf, 2, 3)));
195static void message(int device, char *fmt, ...)
Eric Andersen0460ff21999-10-25 23:32:44 +0000196{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000197 va_list arguments;
198 int fd;
Erik Andersen7dc16072000-01-04 01:10:25 +0000199
Eric Andersen4c781471999-11-26 08:12:56 +0000200#ifdef BB_SYSLOGD
201
Erik Andersene49d5ec2000-02-08 19:58:47 +0000202 /* Log the message to syslogd */
203 if (device & LOG) {
204 char msg[1024];
Eric Andersen4c781471999-11-26 08:12:56 +0000205
Erik Andersene49d5ec2000-02-08 19:58:47 +0000206 va_start(arguments, fmt);
207 vsnprintf(msg, sizeof(msg), fmt, arguments);
208 va_end(arguments);
Eric Andersen53cfb7e2001-01-31 17:29:47 +0000209 openlog(applet_name, 0, LOG_USER);
Erik Andersene132f4b2000-02-09 04:16:43 +0000210 syslog(LOG_USER|LOG_INFO, msg);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000211 closelog();
Eric Andersen3ae0c781999-11-04 01:13:21 +0000212 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000213#else
214 static int log_fd = -1;
215
216 /* Take full control of the log tty, and never close it.
217 * It's mine, all mine! Muhahahaha! */
218 if (log_fd < 0) {
219 if (log == NULL) {
220 /* don't even try to log, because there is no such console */
221 log_fd = -2;
222 /* log to main console instead */
223 device = CONSOLE;
Erik Andersene132f4b2000-02-09 04:16:43 +0000224 } else if ((log_fd = device_open(log, O_RDWR|O_NDELAY)) < 0) {
225 log_fd = -2;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000226 fprintf(stderr, "Bummer, can't write to log on %s!\r\n", log);
Erik Andersene132f4b2000-02-09 04:16:43 +0000227 log = NULL;
228 device = CONSOLE;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000229 }
230 }
231 if ((device & LOG) && (log_fd >= 0)) {
232 va_start(arguments, fmt);
233 vdprintf(log_fd, fmt, arguments);
234 va_end(arguments);
235 }
Eric Andersen4c781471999-11-26 08:12:56 +0000236#endif
237
Erik Andersene49d5ec2000-02-08 19:58:47 +0000238 if (device & CONSOLE) {
239 /* Always send console messages to /dev/console so people will see them. */
240 if (
241 (fd =
242 device_open(_PATH_CONSOLE,
243 O_WRONLY | O_NOCTTY | O_NDELAY)) >= 0) {
244 va_start(arguments, fmt);
245 vdprintf(fd, fmt, arguments);
246 va_end(arguments);
247 close(fd);
248 } else {
249 fprintf(stderr, "Bummer, can't print: ");
250 va_start(arguments, fmt);
251 vfprintf(stderr, fmt, arguments);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000252 va_end(arguments);
253 }
Eric Andersen3ae0c781999-11-04 01:13:21 +0000254 }
Eric Andersencc8ed391999-10-05 16:24:54 +0000255}
256
Eric Andersen0460ff21999-10-25 23:32:44 +0000257/* Set terminal settings to reasonable defaults */
Eric Andersen3e6ff902001-03-09 21:24:12 +0000258static void set_term(int fd)
Eric Andersencc8ed391999-10-05 16:24:54 +0000259{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000260 struct termios tty;
Eric Andersencc8ed391999-10-05 16:24:54 +0000261
Erik Andersene49d5ec2000-02-08 19:58:47 +0000262 tcgetattr(fd, &tty);
Eric Andersencc8ed391999-10-05 16:24:54 +0000263
Erik Andersene49d5ec2000-02-08 19:58:47 +0000264 /* set control chars */
Eric Andersen3849f9b2000-07-10 19:56:47 +0000265 tty.c_cc[VINTR] = 3; /* C-c */
266 tty.c_cc[VQUIT] = 28; /* C-\ */
267 tty.c_cc[VERASE] = 127; /* C-? */
268 tty.c_cc[VKILL] = 21; /* C-u */
269 tty.c_cc[VEOF] = 4; /* C-d */
270 tty.c_cc[VSTART] = 17; /* C-q */
271 tty.c_cc[VSTOP] = 19; /* C-s */
272 tty.c_cc[VSUSP] = 26; /* C-z */
Eric Andersen02bc25b2000-07-06 21:29:32 +0000273
Erik Andersene49d5ec2000-02-08 19:58:47 +0000274 /* use line dicipline 0 */
275 tty.c_line = 0;
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000276
Erik Andersene49d5ec2000-02-08 19:58:47 +0000277 /* Make it be sane */
Erik Andersen6c41c442000-03-19 05:13:49 +0000278 tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD;
279 tty.c_cflag |= HUPCL|CLOCAL;
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) {
331 snprintf(console, sizeof(console) - 1, "%s", s);
332 }
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)
339 snprintf(console, sizeof(console) - 1, "%s", SERIAL_CON0);
340 else if (strcmp(s, "ttyb") == 0)
341 snprintf(console, sizeof(console) - 1, "%s", SERIAL_CON1);
342 }
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 {
354 snprintf(console, sizeof(console) - 1, "%s", _PATH_CONSOLE);
355 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++;
363 snprintf(console, sizeof(console) - 1, "%s", _PATH_CONSOLE);
364 continue;
365 }
366 /* Can't open selected console -- try vt1 */
367 if (!tried_vtprimary) {
368 tried_vtprimary++;
369 snprintf(console, sizeof(console) - 1, "%s", VT_PRIMARY);
370 continue;
371 }
372 break;
373 }
374 if (fd < 0) {
375 /* Perhaps we should panic here? */
376 snprintf(console, sizeof(console) - 1, "/dev/null");
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)
388 snprintf(termType, sizeof(termType) - 1, "TERM=vt102");
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}
396
Erik Andersene49d5ec2000-02-08 19:58:47 +0000397static pid_t run(char *command, char *terminal, int get_enter)
Eric Andersen0460ff21999-10-25 23:32:44 +0000398{
Eric Andersen477aedd2001-02-20 18:01:50 +0000399 int i=0, j=0;
400 int fd;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000401 pid_t pid;
402 char *tmpCmd;
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000403 char *cmd[255], *cmdpath;
Erik Andersene132f4b2000-02-09 04:16:43 +0000404 char buf[255];
Erik Andersene49d5ec2000-02-08 19:58:47 +0000405 static const char press_enter[] =
406
Eric Andersen38624232001-01-25 00:04:16 +0000407#ifdef CUSTOMIZED_BANNER
408#include CUSTOMIZED_BANNER
409#endif
410
Erik Andersene49d5ec2000-02-08 19:58:47 +0000411 "\nPlease press Enter to activate this console. ";
Eric Andersen477aedd2001-02-20 18:01:50 +0000412 char *environment[MAXENV+1] = {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000413 "HOME=/",
414 "PATH=/usr/bin:/bin:/usr/sbin:/sbin",
415 "SHELL=/bin/sh",
416 termType,
Eric Andersen477aedd2001-02-20 18:01:50 +0000417 "USER=root"
Erik Andersene49d5ec2000-02-08 19:58:47 +0000418 };
Erik Andersenac6e71f2000-01-08 22:04:33 +0000419
Eric Andersen477aedd2001-02-20 18:01:50 +0000420 while (environment[i]) i++;
421 while ((environ[j]) && (i < MAXENV)) {
422 if (strncmp(environ[j], "TERM=", 5))
423 environment[i++] = environ[j];
Eric Andersen477aedd2001-02-20 18:01:50 +0000424 j++;
425 }
426
Erik Andersene49d5ec2000-02-08 19:58:47 +0000427 if ((pid = fork()) == 0) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000428 /* Clean up */
Eric Andersenfb6a5082000-09-13 16:15:29 +0000429 ioctl(0, TIOCNOTTY, 0);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000430 close(0);
431 close(1);
432 close(2);
433 setsid();
Eric Andersen0460ff21999-10-25 23:32:44 +0000434
Erik Andersene49d5ec2000-02-08 19:58:47 +0000435 /* Reset signal handlers set for parent process */
436 signal(SIGUSR1, SIG_DFL);
437 signal(SIGUSR2, SIG_DFL);
438 signal(SIGINT, SIG_DFL);
439 signal(SIGTERM, SIG_DFL);
440 signal(SIGHUP, SIG_DFL);
Eric Andersen2f6c04f1999-11-01 23:59:44 +0000441
Erik Andersene49d5ec2000-02-08 19:58:47 +0000442 if ((fd = device_open(terminal, O_RDWR)) < 0) {
Eric Andersen53f50612001-03-14 09:01:11 +0000443 struct stat statBuf;
444 if (stat(terminal, &statBuf) != 0) {
445 message(LOG | CONSOLE, "device '%s' does not exist.\n",
446 terminal);
447 exit(1);
448 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000449 message(LOG | CONSOLE, "Bummer, can't open %s\r\n", terminal);
450 exit(1);
451 }
452 dup2(fd, 0);
453 dup2(fd, 1);
454 dup2(fd, 2);
Eric Andersenfb6a5082000-09-13 16:15:29 +0000455 ioctl(0, TIOCSCTTY, 1);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000456 tcsetpgrp(0, getpgrp());
457 set_term(0);
458
459 if (get_enter == TRUE) {
460 /*
461 * Save memory by not exec-ing anything large (like a shell)
462 * before the user wants it. This is critical if swap is not
463 * enabled and the system has low memory. Generally this will
464 * be run on the second virtual console, and the first will
465 * be allowed to start a shell or whatever an init script
466 * specifies.
467 */
Erik Andersene132f4b2000-02-09 04:16:43 +0000468#ifdef DEBUG_INIT
Erik Andersene49d5ec2000-02-08 19:58:47 +0000469 message(LOG, "Waiting for enter to start '%s' (pid %d, console %s)\r\n",
Eric Andersendbcd8ce2001-02-22 04:55:33 +0000470 command, getpid(), terminal);
Erik Andersene132f4b2000-02-09 04:16:43 +0000471#endif
Erik Andersene49d5ec2000-02-08 19:58:47 +0000472 write(fileno(stdout), press_enter, sizeof(press_enter) - 1);
Pavel Roskincbe05e42000-09-14 22:47:29 +0000473 getc(stdin);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000474 }
475
Erik Andersene49d5ec2000-02-08 19:58:47 +0000476#ifdef DEBUG_INIT
Erik Andersene132f4b2000-02-09 04:16:43 +0000477 /* Log the process name and args */
478 message(LOG, "Starting pid %d, console %s: '%s'\r\n",
Eric Andersendbcd8ce2001-02-22 04:55:33 +0000479 getpid(), terminal, command);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000480#endif
Erik Andersene132f4b2000-02-09 04:16:43 +0000481
482 /* See if any special /bin/sh requiring characters are present */
483 if (strpbrk(command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
484 cmd[0] = SHELL;
485 cmd[1] = "-c";
486 strcpy(buf, "exec ");
487 strncat(buf, command, sizeof(buf) - strlen(buf) - 1);
488 cmd[2] = buf;
489 cmd[3] = NULL;
490 } else {
491 /* Convert command (char*) into cmd (char**, one word per string) */
492 for (tmpCmd = command, i = 0;
493 (tmpCmd = strsep(&command, " \t")) != NULL;) {
494 if (*tmpCmd != '\0') {
495 cmd[i] = tmpCmd;
496 tmpCmd++;
497 i++;
498 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000499 }
Erik Andersene132f4b2000-02-09 04:16:43 +0000500 cmd[i] = NULL;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000501 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000502
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000503 cmdpath = cmd[0];
504
505 /*
506 Interactive shells want to see a dash in argv[0]. This
507 typically is handled by login, argv will be setup this
508 way if a dash appears at the front of the command path
509 (like "-/bin/sh").
510 */
511
512 if (*cmdpath == '-') {
513 char *s;
514
515 /* skip over the dash */
516 ++cmdpath;
517
518 /* find the last component in the command pathname */
519 s = get_last_path_component(cmdpath);
520
521 /* 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
Erik Andersen183da4a2000-04-04 18:36:37 +0000531#if defined BB_FEATURE_INIT_COREDUMPS
Erik Andersen983b51b2000-04-04 18:14:25 +0000532 {
533 struct stat sb;
534 if (stat (CORE_ENABLE_FLAG_FILE, &sb) == 0) {
535 struct rlimit limit;
536 limit.rlim_cur = RLIM_INFINITY;
537 limit.rlim_max = RLIM_INFINITY;
538 setrlimit(RLIMIT_CORE, &limit);
539 }
540 }
Erik Andersen183da4a2000-04-04 18:36:37 +0000541#endif
Erik Andersen983b51b2000-04-04 18:14:25 +0000542
Erik Andersene49d5ec2000-02-08 19:58:47 +0000543 /* Now run it. The new program will take over this PID,
544 * so nothing further in init.c should be run. */
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000545 execve(cmdpath, cmd, environment);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000546
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000547 /* We're still here? Some error happened. */
548 message(LOG | CONSOLE, "Bummer, could not run '%s': %s\n", cmdpath,
549 strerror(errno));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000550 exit(-1);
Erik Andersen05df2392000-01-13 04:43:48 +0000551 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000552 return pid;
Eric Andersen0460ff21999-10-25 23:32:44 +0000553}
554
Erik Andersene49d5ec2000-02-08 19:58:47 +0000555static int waitfor(char *command, char *terminal, int get_enter)
Erik Andersen0e3782f2000-01-07 02:54:55 +0000556{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000557 int status, wpid;
558 int pid = run(command, terminal, get_enter);
Erik Andersen0e3782f2000-01-07 02:54:55 +0000559
Erik Andersene49d5ec2000-02-08 19:58:47 +0000560 while (1) {
561 wpid = wait(&status);
Erik Andersene132f4b2000-02-09 04:16:43 +0000562 if (wpid > 0 && wpid != pid) {
563 continue;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000564 }
565 if (wpid == pid)
566 break;
Erik Andersen0e3782f2000-01-07 02:54:55 +0000567 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000568 return wpid;
Erik Andersen0e3782f2000-01-07 02:54:55 +0000569}
570
Eric Andersen219d6f51999-11-02 19:43:01 +0000571/* Make sure there is enough memory to do something useful. *
Erik Andersene132f4b2000-02-09 04:16:43 +0000572 * Calls "swapon -a" if needed so be sure /etc/fstab is present... */
Eric Andersen219d6f51999-11-02 19:43:01 +0000573static void check_memory()
574{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000575 struct stat statBuf;
Eric Andersen219d6f51999-11-02 19:43:01 +0000576
Erik Andersend07ee462000-02-21 21:26:32 +0000577 if (check_free_memory() > 1000)
Erik Andersene49d5ec2000-02-08 19:58:47 +0000578 return;
579
580 if (stat("/etc/fstab", &statBuf) == 0) {
Erik Andersen61677fe2000-04-13 01:18:56 +0000581 /* swapon -a requires /proc typically */
582 waitfor("mount proc /proc -t proc", console, FALSE);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000583 /* Try to turn on swap */
Erik Andersen61677fe2000-04-13 01:18:56 +0000584 waitfor("swapon -a", console, FALSE);
Erik Andersend07ee462000-02-21 21:26:32 +0000585 if (check_free_memory() < 1000)
Erik Andersene49d5ec2000-02-08 19:58:47 +0000586 goto goodnight;
587 } else
588 goto goodnight;
Eric Andersen219d6f51999-11-02 19:43:01 +0000589 return;
590
Erik Andersene49d5ec2000-02-08 19:58:47 +0000591 goodnight:
592 message(CONSOLE,
593 "Sorry, your computer does not have enough memory.\r\n");
594 while (1)
595 sleep(1);
Eric Andersen219d6f51999-11-02 19:43:01 +0000596}
597
Erik Andersene132f4b2000-02-09 04:16:43 +0000598/* Run all commands to be run right before halt/reboot */
599static void run_lastAction(void)
600{
Eric Andersen0d4e51d2001-03-15 19:18:21 +0000601 initAction *a, *tmp;
602 for (a = tmp = initActionList; a; a = tmp = tmp->nextPtr) {
Erik Andersene132f4b2000-02-09 04:16:43 +0000603 if (a->action == CTRLALTDEL) {
604 waitfor(a->process, a->console, FALSE);
605 delete_initAction(a);
606 }
607 }
608}
609
610
Erik Andersen7dc16072000-01-04 01:10:25 +0000611#ifndef DEBUG_INIT
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000612static void shutdown_system(void)
Eric Andersencc8ed391999-10-05 16:24:54 +0000613{
Erik Andersene132f4b2000-02-09 04:16:43 +0000614
Erik Andersene49d5ec2000-02-08 19:58:47 +0000615 /* first disable our SIGHUP signal */
616 signal(SIGHUP, SIG_DFL);
Erik Andersen7dc16072000-01-04 01:10:25 +0000617
Erik Andersene49d5ec2000-02-08 19:58:47 +0000618 /* Allow Ctrl-Alt-Del to reboot system. */
Erik Andersen4f3f7572000-04-28 00:18:56 +0000619 init_reboot(RB_ENABLE_CAD);
Erik Andersene132f4b2000-02-09 04:16:43 +0000620
621 message(CONSOLE|LOG, "\r\nThe system is going down NOW !!\r\n");
Eric Andersencf8c9cf1999-11-05 00:31:46 +0000622 sync();
Erik Andersene49d5ec2000-02-08 19:58:47 +0000623
624 /* Send signals to every process _except_ pid 1 */
Erik Andersene132f4b2000-02-09 04:16:43 +0000625 message(CONSOLE|LOG, "Sending SIGTERM to all processes.\r\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000626 kill(-1, SIGTERM);
Erik Andersene132f4b2000-02-09 04:16:43 +0000627 sleep(1);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000628 sync();
629
Erik Andersene132f4b2000-02-09 04:16:43 +0000630 message(CONSOLE|LOG, "Sending SIGKILL to all processes.\r\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000631 kill(-1, SIGKILL);
Erik Andersene132f4b2000-02-09 04:16:43 +0000632 sleep(1);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000633
Erik Andersene132f4b2000-02-09 04:16:43 +0000634 /* run everything to be run at "ctrlaltdel" */
635 run_lastAction();
636
Erik Andersene49d5ec2000-02-08 19:58:47 +0000637 sync();
Eric Andersenbd22ed82000-07-08 18:55:24 +0000638 if (kernelVersion > 0 && kernelVersion <= KERNEL_VERSION(2,2,11)) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000639 /* bdflush, kupdate not needed for kernels >2.2.11 */
640 bdflush(1, 0);
641 sync();
642 }
Eric Andersencc8ed391999-10-05 16:24:54 +0000643}
644
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000645static void halt_signal(int sig)
Eric Andersencc8ed391999-10-05 16:24:54 +0000646{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000647 shutdown_system();
Erik Andersene132f4b2000-02-09 04:16:43 +0000648 message(CONSOLE|LOG,
Erik Andersene49d5ec2000-02-08 19:58:47 +0000649 "The system is halted. Press %s or turn off power\r\n",
650 (secondConsole == NULL) /* serial console */
651 ? "Reset" : "CTRL-ALT-DEL");
652 sync();
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000653
Erik Andersene49d5ec2000-02-08 19:58:47 +0000654 /* allow time for last message to reach serial console */
Erik Andersene132f4b2000-02-09 04:16:43 +0000655 sleep(2);
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000656
Eric Andersenbd22ed82000-07-08 18:55:24 +0000657 if (sig == SIGUSR2 && kernelVersion >= KERNEL_VERSION(2,2,0))
Erik Andersen4f3f7572000-04-28 00:18:56 +0000658 init_reboot(RB_POWER_OFF);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000659 else
Erik Andersen4f3f7572000-04-28 00:18:56 +0000660 init_reboot(RB_HALT_SYSTEM);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000661 exit(0);
Eric Andersencc8ed391999-10-05 16:24:54 +0000662}
663
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000664static void reboot_signal(int sig)
Eric Andersencc8ed391999-10-05 16:24:54 +0000665{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000666 shutdown_system();
Erik Andersene132f4b2000-02-09 04:16:43 +0000667 message(CONSOLE|LOG, "Please stand by while rebooting the system.\r\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000668 sync();
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000669
Erik Andersene49d5ec2000-02-08 19:58:47 +0000670 /* allow time for last message to reach serial console */
671 sleep(2);
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000672
Erik Andersen4f3f7572000-04-28 00:18:56 +0000673 init_reboot(RB_AUTOBOOT);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000674 exit(0);
Eric Andersencc8ed391999-10-05 16:24:54 +0000675}
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000676
Erik Andersene49d5ec2000-02-08 19:58:47 +0000677#endif /* ! DEBUG_INIT */
Erik Andersende552872000-01-23 01:34:05 +0000678
Eric Andersen3e6ff902001-03-09 21:24:12 +0000679static void new_initAction(initActionEnum action, char *process, char *cons)
Erik Andersen7dc16072000-01-04 01:10:25 +0000680{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000681 initAction *newAction;
Erik Andersen9e737252000-01-06 01:16:13 +0000682
Erik Andersene49d5ec2000-02-08 19:58:47 +0000683 if (*cons == '\0')
684 cons = console;
Erik Andersen9e737252000-01-06 01:16:13 +0000685
Erik Andersene49d5ec2000-02-08 19:58:47 +0000686 /* If BusyBox detects that a serial console is in use,
687 * then entries not refering to the console or null devices will _not_ be run.
688 * The exception to this rule is the null device.
689 */
690 if (secondConsole == NULL && strcmp(cons, console)
691 && strcmp(cons, "/dev/null"))
692 return;
693
694 newAction = calloc((size_t) (1), sizeof(initAction));
695 if (!newAction) {
696 message(LOG | CONSOLE, "Memory allocation failure\n");
697 while (1)
698 sleep(1);
699 }
700 newAction->nextPtr = initActionList;
701 initActionList = newAction;
702 strncpy(newAction->process, process, 255);
703 newAction->action = action;
704 strncpy(newAction->console, cons, 255);
705 newAction->pid = 0;
Erik Andersen31638212000-01-15 22:28:50 +0000706// message(LOG|CONSOLE, "process='%s' action='%d' console='%s'\n",
Erik Andersene49d5ec2000-02-08 19:58:47 +0000707// newAction->process, newAction->action, newAction->console);
Erik Andersen7dc16072000-01-04 01:10:25 +0000708}
709
Erik Andersene132f4b2000-02-09 04:16:43 +0000710static void delete_initAction(initAction * action)
Erik Andersen7dc16072000-01-04 01:10:25 +0000711{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000712 initAction *a, *b = NULL;
713
714 for (a = initActionList; a; b = a, a = a->nextPtr) {
715 if (a == action) {
716 if (b == NULL) {
717 initActionList = a->nextPtr;
718 } else {
719 b->nextPtr = a->nextPtr;
720 }
721 free(a);
722 break;
723 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000724 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000725}
726
Erik Andersen9e737252000-01-06 01:16:13 +0000727/* NOTE that if BB_FEATURE_USE_INITTAB is NOT defined,
728 * then parse_inittab() simply adds in some default
729 * actions(i.e runs INIT_SCRIPT and then starts a pair
Erik Andersen812d4662000-01-07 18:30:40 +0000730 * of "askfirst" shells). If BB_FEATURE_USE_INITTAB
731 * _is_ defined, but /etc/inittab is missing, this
732 * results in the same set of default behaviors.
Erik Andersen9e737252000-01-06 01:16:13 +0000733 * */
Eric Andersen3e6ff902001-03-09 21:24:12 +0000734static void parse_inittab(void)
Erik Andersen7dc16072000-01-04 01:10:25 +0000735{
Erik Andersen9e737252000-01-06 01:16:13 +0000736#ifdef BB_FEATURE_USE_INITTAB
Erik Andersene49d5ec2000-02-08 19:58:47 +0000737 FILE *file;
738 char buf[256], lineAsRead[256], tmpConsole[256];
Eric Andersenb5966362000-05-31 20:04:38 +0000739 char *id, *runlev, *action, *process, *eol;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000740 const struct initActionType *a = actions;
741 int foundIt;
Erik Andersen7dc16072000-01-04 01:10:25 +0000742
743
Erik Andersene49d5ec2000-02-08 19:58:47 +0000744 file = fopen(INITTAB, "r");
745 if (file == NULL) {
746 /* No inittab file -- set up some default behavior */
Erik Andersen9e737252000-01-06 01:16:13 +0000747#endif
Erik Andersene132f4b2000-02-09 04:16:43 +0000748 /* Swapoff on halt/reboot */
Pavel Roskin33bee332000-09-15 01:02:50 +0000749 new_initAction(CTRLALTDEL, "/sbin/swapoff -a", console);
Erik Andersene132f4b2000-02-09 04:16:43 +0000750 /* Umount all filesystems on halt/reboot */
Pavel Roskin33bee332000-09-15 01:02:50 +0000751 new_initAction(CTRLALTDEL, "/bin/umount -a -r", console);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000752 /* Askfirst shell on tty1 */
753 new_initAction(ASKFIRST, SHELL, console);
754 /* Askfirst shell on tty2 */
755 if (secondConsole != NULL)
756 new_initAction(ASKFIRST, SHELL, secondConsole);
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000757 /* Askfirst shell on tty3 */
758 if (thirdConsole != NULL)
759 new_initAction(ASKFIRST, SHELL, thirdConsole);
760 /* Askfirst shell on tty4 */
761 if (fourthConsole != NULL)
762 new_initAction(ASKFIRST, SHELL, fourthConsole);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000763 /* sysinit */
764 new_initAction(SYSINIT, INIT_SCRIPT, console);
Erik Andersen7dc16072000-01-04 01:10:25 +0000765
Erik Andersene49d5ec2000-02-08 19:58:47 +0000766 return;
Erik Andersen9e737252000-01-06 01:16:13 +0000767#ifdef BB_FEATURE_USE_INITTAB
Erik Andersen9e737252000-01-06 01:16:13 +0000768 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000769
Erik Andersene49d5ec2000-02-08 19:58:47 +0000770 while (fgets(buf, 255, file) != NULL) {
771 foundIt = FALSE;
Eric Andersenb5966362000-05-31 20:04:38 +0000772 /* Skip leading spaces */
773 for (id = buf; *id == ' ' || *id == '\t'; id++);
774
775 /* Skip the line if it's a comment */
776 if (*id == '#' || *id == '\n')
Erik Andersene49d5ec2000-02-08 19:58:47 +0000777 continue;
Erik Andersen7dc16072000-01-04 01:10:25 +0000778
Erik Andersene49d5ec2000-02-08 19:58:47 +0000779 /* Trim the trailing \n */
Eric Andersenb5966362000-05-31 20:04:38 +0000780 eol = strrchr(id, '\n');
781 if (eol != NULL)
782 *eol = '\0';
Erik Andersen7dc16072000-01-04 01:10:25 +0000783
Erik Andersene49d5ec2000-02-08 19:58:47 +0000784 /* Keep a copy around for posterity's sake (and error msgs) */
785 strcpy(lineAsRead, buf);
786
Eric Andersenb5966362000-05-31 20:04:38 +0000787 /* Separate the ID field from the runlevels */
788 runlev = strchr(id, ':');
789 if (runlev == NULL || *(runlev + 1) == '\0') {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000790 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
791 continue;
792 } else {
Eric Andersenb5966362000-05-31 20:04:38 +0000793 *runlev = '\0';
794 ++runlev;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000795 }
796
Eric Andersenb5966362000-05-31 20:04:38 +0000797 /* Separate the runlevels from the action */
798 action = strchr(runlev, ':');
799 if (action == NULL || *(action + 1) == '\0') {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000800 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
801 continue;
802 } else {
Eric Andersenb5966362000-05-31 20:04:38 +0000803 *action = '\0';
804 ++action;
805 }
806
807 /* Separate the action from the process */
808 process = strchr(action, ':');
809 if (process == NULL || *(process + 1) == '\0') {
810 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
811 continue;
812 } else {
813 *process = '\0';
814 ++process;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000815 }
816
817 /* Ok, now process it */
818 a = actions;
819 while (a->name != 0) {
Eric Andersenb5966362000-05-31 20:04:38 +0000820 if (strcmp(a->name, action) == 0) {
821 if (*id != '\0') {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000822 strcpy(tmpConsole, "/dev/");
Eric Andersenb5966362000-05-31 20:04:38 +0000823 strncat(tmpConsole, id, 200);
Eric Andersenb5966362000-05-31 20:04:38 +0000824 id = tmpConsole;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000825 }
Eric Andersenb5966362000-05-31 20:04:38 +0000826 new_initAction(a->action, process, id);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000827 foundIt = TRUE;
828 }
829 a++;
830 }
831 if (foundIt == TRUE)
832 continue;
833 else {
834 /* Choke on an unknown action */
835 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
836 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000837 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000838 return;
Erik Andersen42094cd2000-03-20 21:34:52 +0000839#endif /* BB_FEATURE_USE_INITTAB */
Erik Andersen7dc16072000-01-04 01:10:25 +0000840}
841
Erik Andersene132f4b2000-02-09 04:16:43 +0000842
843
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000844extern int init_main(int argc, char **argv)
Eric Andersen0460ff21999-10-25 23:32:44 +0000845{
Eric Andersen0d4e51d2001-03-15 19:18:21 +0000846 initAction *a, *tmp;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000847 pid_t wpid;
848 int status;
Eric Andersen0460ff21999-10-25 23:32:44 +0000849
Eric Andersend73dc5b1999-11-10 23:13:02 +0000850#ifndef DEBUG_INIT
Erik Andersena51ecdd2000-02-24 18:09:58 +0000851 /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
852 if (getpid() != 1
853#ifdef BB_FEATURE_LINUXRC
Matt Kraaie58771e2000-07-12 15:38:49 +0000854 && strstr(applet_name, "linuxrc") == NULL
Erik Andersena51ecdd2000-02-24 18:09:58 +0000855#endif
856 )
857 {
Eric Andersen67991cf2001-02-14 21:23:06 +0000858 show_usage();
Erik Andersene49d5ec2000-02-08 19:58:47 +0000859 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000860 /* Set up sig handlers -- be sure to
861 * clear all of these in run() */
862 signal(SIGUSR1, halt_signal);
Eric Andersen4c95a282000-07-07 19:30:28 +0000863 signal(SIGUSR2, halt_signal);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000864 signal(SIGINT, reboot_signal);
865 signal(SIGTERM, reboot_signal);
Eric Andersen0460ff21999-10-25 23:32:44 +0000866
Erik Andersene49d5ec2000-02-08 19:58:47 +0000867 /* Turn off rebooting via CTL-ALT-DEL -- we get a
868 * SIGINT on CAD so we can shut things down gracefully... */
Erik Andersen4f3f7572000-04-28 00:18:56 +0000869 init_reboot(RB_DISABLE_CAD);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000870#endif
Erik Andersen05df2392000-01-13 04:43:48 +0000871
Erik Andersen298854f2000-03-23 01:09:18 +0000872 /* Figure out what kernel this is running */
873 kernelVersion = get_kernel_revision();
874
Erik Andersene49d5ec2000-02-08 19:58:47 +0000875 /* Figure out where the default console should be */
876 console_init();
Eric Andersen0460ff21999-10-25 23:32:44 +0000877
Erik Andersene49d5ec2000-02-08 19:58:47 +0000878 /* Close whatever files are open, and reset the console. */
879 close(0);
880 close(1);
881 close(2);
882 set_term(0);
Erik Andersen983b51b2000-04-04 18:14:25 +0000883 chdir("/");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000884 setsid();
Eric Andersencc8ed391999-10-05 16:24:54 +0000885
Erik Andersene49d5ec2000-02-08 19:58:47 +0000886 /* Make sure PATH is set to something sane */
Eric Andersen452fd332001-03-04 06:47:33 +0000887 putenv("PATH="_PATH_STDPATH);
Eric Andersencc8ed391999-10-05 16:24:54 +0000888
Erik Andersene49d5ec2000-02-08 19:58:47 +0000889 /* Hello world */
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000890#ifndef DEBUG_INIT
Erik Andersenea6b67d2000-03-07 07:47:10 +0000891 message(
892#if ! defined BB_FEATURE_EXTRA_QUIET
893 CONSOLE|
894#endif
895 LOG,
Pavel Roskin9c5fcc32000-07-17 23:45:12 +0000896 "init started: %s\r\n", full_version);
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000897#else
Erik Andersenea6b67d2000-03-07 07:47:10 +0000898 message(
899#if ! defined BB_FEATURE_EXTRA_QUIET
900 CONSOLE|
901#endif
902 LOG,
Pavel Roskin9c5fcc32000-07-17 23:45:12 +0000903 "init(%d) started: %s\r\n", getpid(), full_version);
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000904#endif
Eric Andersencc8ed391999-10-05 16:24:54 +0000905
Eric Andersencc8ed391999-10-05 16:24:54 +0000906
Erik Andersene49d5ec2000-02-08 19:58:47 +0000907 /* Make sure there is enough memory to do something useful. */
908 check_memory();
Erik Andersen9e737252000-01-06 01:16:13 +0000909
Erik Andersene49d5ec2000-02-08 19:58:47 +0000910 /* Check if we are supposed to be in single user mode */
911 if (argc > 1 && (!strcmp(argv[1], "single") ||
912 !strcmp(argv[1], "-s") || !strcmp(argv[1], "1"))) {
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000913 /* Ask first then start a shell on tty2-4 */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000914 if (secondConsole != NULL)
915 new_initAction(ASKFIRST, SHELL, secondConsole);
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000916 if (thirdConsole != NULL)
917 new_initAction(ASKFIRST, SHELL, thirdConsole);
918 if (fourthConsole != NULL)
919 new_initAction(ASKFIRST, SHELL, fourthConsole);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000920 /* Start a shell on tty1 */
921 new_initAction(RESPAWN, SHELL, console);
922 } else {
923 /* Not in single user mode -- see what inittab says */
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000924
Erik Andersene49d5ec2000-02-08 19:58:47 +0000925 /* NOTE that if BB_FEATURE_USE_INITTAB is NOT defined,
926 * then parse_inittab() simply adds in some default
927 * actions(i.e runs INIT_SCRIPT and then starts a pair
928 * of "askfirst" shells */
929 parse_inittab();
Eric Andersend00c2621999-12-07 08:37:31 +0000930 }
Erik Andersen983b51b2000-04-04 18:14:25 +0000931
Erik Andersene132f4b2000-02-09 04:16:43 +0000932 /* Fix up argv[0] to be certain we claim to be init */
Eric Andersenf34aa4c2000-09-21 02:32:11 +0000933 argv[0]="init";
934
Erik Andersen07f56042000-02-09 06:05:01 +0000935 if (argc > 1)
Eric Andersen53cfb7e2001-01-31 17:29:47 +0000936 argv[1][0]=0;
Eric Andersen219d6f51999-11-02 19:43:01 +0000937
Erik Andersene49d5ec2000-02-08 19:58:47 +0000938 /* Now run everything that needs to be run */
939
940 /* First run the sysinit command */
Eric Andersen0d4e51d2001-03-15 19:18:21 +0000941 for (a = tmp = initActionList; a; a = tmp = tmp->nextPtr) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000942 if (a->action == SYSINIT) {
943 waitfor(a->process, a->console, FALSE);
944 /* Now remove the "sysinit" entry from the list */
945 delete_initAction(a);
Erik Andersen7dc16072000-01-04 01:10:25 +0000946 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000947 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000948 /* Next run anything that wants to block */
Eric Andersen0d4e51d2001-03-15 19:18:21 +0000949 for (a = tmp = initActionList; a; a = tmp = tmp->nextPtr) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000950 if (a->action == WAIT) {
951 waitfor(a->process, a->console, FALSE);
952 /* Now remove the "wait" entry from the list */
953 delete_initAction(a);
Erik Andersen7dc16072000-01-04 01:10:25 +0000954 }
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000955 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000956 /* Next run anything to be run only once */
Eric Andersen0d4e51d2001-03-15 19:18:21 +0000957 for (a = tmp = initActionList; a; a = tmp = tmp->nextPtr) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000958 if (a->action == ONCE) {
959 run(a->process, a->console, FALSE);
960 /* Now remove the "once" entry from the list */
961 delete_initAction(a);
962 }
963 }
964 /* If there is nothing else to do, stop */
965 if (initActionList == NULL) {
966 message(LOG | CONSOLE,
967 "No more tasks for init -- sleeping forever.\n");
968 while (1)
969 sleep(1);
970 }
971
972 /* Now run the looping stuff for the rest of forever */
973 while (1) {
974 for (a = initActionList; a; a = a->nextPtr) {
975 /* Only run stuff with pid==0. If they have
976 * a pid, that means they are still running */
977 if (a->pid == 0) {
978 switch (a->action) {
979 case RESPAWN:
980 /* run the respawn stuff */
981 a->pid = run(a->process, a->console, FALSE);
982 break;
983 case ASKFIRST:
984 /* run the askfirst stuff */
985 a->pid = run(a->process, a->console, TRUE);
986 break;
987 /* silence the compiler's incessant whining */
988 default:
989 break;
990 }
991 }
992 }
993 /* Wait for a child process to exit */
994 wpid = wait(&status);
995 if (wpid > 0) {
996 /* Find out who died and clean up their corpse */
997 for (a = initActionList; a; a = a->nextPtr) {
998 if (a->pid == wpid) {
999 a->pid = 0;
1000 message(LOG,
1001 "Process '%s' (pid %d) exited. Scheduling it for restart.\n",
1002 a->process, wpid);
1003 }
1004 }
1005 }
1006 sleep(1);
1007 }
Eric Andersencc8ed391999-10-05 16:24:54 +00001008}
Erik Andersen029011b2000-03-04 21:19:32 +00001009
1010/*
1011Local Variables:
1012c-file-style: "linux"
1013c-basic-offset: 4
1014tab-width: 4
1015End:
1016*/