blob: 2c23e60b7500d42e58fe3f4e9bd097b270e5bfee [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
Eric Andersencc8ed391999-10-05 16:24:54 +000030#include "internal.h"
Erik Andersen4f3f7572000-04-28 00:18:56 +000031#include <stdio.h>
32#include <stdlib.h>
Eric Andersencc8ed391999-10-05 16:24:54 +000033#include <errno.h>
Eric Andersenb186d981999-12-03 09:19:54 +000034#include <paths.h>
Erik Andersen42094cd2000-03-20 21:34:52 +000035#include <signal.h>
36#include <stdarg.h>
Eric Andersencc8ed391999-10-05 16:24:54 +000037#include <string.h>
Erik Andersen4f3f7572000-04-28 00:18:56 +000038#include <termios.h>
39#include <unistd.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>
Erik Andersen4f3f7572000-04-28 00:18:56 +000045#ifdef BB_SYSLOGD
46# include <sys/syslog.h>
47#endif
48
Pavel Roskin9c5fcc32000-07-17 23:45:12 +000049#define bb_need_full_version
50#define BB_DECLARE_EXTERN
51#include "messages.c"
52
Eric Andersenbd22ed82000-07-08 18:55:24 +000053/* From <linux/vt.h> */
54struct vt_stat {
55 unsigned short v_active; /* active vt */
56 unsigned short v_signal; /* signal to send */
57 unsigned short v_state; /* vt bitmask */
58};
59#define VT_GETSTATE 0x5603 /* get global vt state info */
60
61/* From <linux/serial.h> */
62struct serial_struct {
63 int type;
64 int line;
65 int port;
66 int irq;
67 int flags;
68 int xmit_fifo_size;
69 int custom_divisor;
70 int baud_base;
71 unsigned short close_delay;
72 char reserved_char[2];
73 int hub6;
74 unsigned short closing_wait; /* time to wait before closing */
75 unsigned short closing_wait2; /* no longer used... */
76 int reserved[4];
77};
78
79
Erik Andersen4f3f7572000-04-28 00:18:56 +000080
81#ifndef RB_HALT_SYSTEM
82#define RB_HALT_SYSTEM 0xcdef0123
83#define RB_ENABLE_CAD 0x89abcdef
84#define RB_DISABLE_CAD 0
85#define RB_POWER_OFF 0x4321fedc
86#define RB_AUTOBOOT 0x01234567
87#if defined(__GLIBC__)
88#include <sys/reboot.h>
89 #define init_reboot(magic) reboot(magic)
90#else
91 #define init_reboot(magic) reboot(0xfee1dead, 672274793, magic)
92#endif
93#endif
94
95#ifndef _PATH_STDPATH
96#define _PATH_STDPATH "/usr/bin:/bin:/usr/sbin:/sbin"
97#endif
Eric Andersencc8ed391999-10-05 16:24:54 +000098
Erik Andersen983b51b2000-04-04 18:14:25 +000099
Erik Andersen183da4a2000-04-04 18:36:37 +0000100#if defined BB_FEATURE_INIT_COREDUMPS
Erik Andersen983b51b2000-04-04 18:14:25 +0000101/*
Erik Andersen183da4a2000-04-04 18:36:37 +0000102 * When a file named CORE_ENABLE_FLAG_FILE exists, setrlimit is called
103 * before processes are spawned to set core file size as unlimited.
104 * This is for debugging only. Don't use this is production, unless
105 * you want core dumps lying about....
Erik Andersen983b51b2000-04-04 18:14:25 +0000106 */
107#define CORE_ENABLE_FLAG_FILE "/.init_enable_core"
108#include <sys/resource.h>
109#include <sys/time.h>
Erik Andersen183da4a2000-04-04 18:36:37 +0000110#endif
Erik Andersen983b51b2000-04-04 18:14:25 +0000111
Erik Andersen4d1d0111999-12-17 18:44:15 +0000112#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
Erik Andersen4d1d0111999-12-17 18:44:15 +0000113
Erik Andersen4f3f7572000-04-28 00:18:56 +0000114#if defined(__GLIBC__)
115#include <sys/kdaemon.h>
116#else
Eric Andersena15cd0b2000-06-19 18:14:20 +0000117static _syscall2(int, bdflush, int, func, int, data);
Erik Andersen4f3f7572000-04-28 00:18:56 +0000118#endif /* __GLIBC__ */
119
Eric Andersen0ecb54a1999-12-05 23:24:55 +0000120
Erik Andersen42094cd2000-03-20 21:34:52 +0000121#define VT_PRIMARY "/dev/tty1" /* Primary virtual console */
122#define VT_SECONDARY "/dev/tty2" /* Virtual console */
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000123#define VT_THIRD "/dev/tty3" /* Virtual console */
124#define VT_FOURTH "/dev/tty4" /* Virtual console */
125#define VT_LOG "/dev/tty5" /* Virtual console */
Erik Andersen42094cd2000-03-20 21:34:52 +0000126#define SERIAL_CON0 "/dev/ttyS0" /* Primary serial console */
127#define SERIAL_CON1 "/dev/ttyS1" /* Serial console */
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000128#define SHELL "-/bin/sh" /* Default shell */
Erik Andersen42094cd2000-03-20 21:34:52 +0000129#define INITTAB "/etc/inittab" /* inittab file location */
Erik Andersen96e2abd2000-01-07 11:40:44 +0000130#ifndef INIT_SCRIPT
Erik Andersen42094cd2000-03-20 21:34:52 +0000131#define INIT_SCRIPT "/etc/init.d/rcS" /* Default sysinit script. */
Erik Andersen96e2abd2000-01-07 11:40:44 +0000132#endif
Erik Andersen9c88cac1999-12-30 09:25:17 +0000133
Erik Andersen42094cd2000-03-20 21:34:52 +0000134#define LOG 0x1
135#define CONSOLE 0x2
Erik Andersen7dc16072000-01-04 01:10:25 +0000136
137/* Allowed init action types */
138typedef enum {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000139 SYSINIT = 1,
140 RESPAWN,
141 ASKFIRST,
142 WAIT,
Erik Andersene132f4b2000-02-09 04:16:43 +0000143 ONCE,
144 CTRLALTDEL
Erik Andersen7dc16072000-01-04 01:10:25 +0000145} initActionEnum;
146
Erik Andersen42094cd2000-03-20 21:34:52 +0000147/* A mapping between "inittab" action name strings and action type codes. */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000148typedef struct initActionType {
149 const char *name;
150 initActionEnum action;
Erik Andersen7dc16072000-01-04 01:10:25 +0000151} initActionType;
152
153static const struct initActionType actions[] = {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000154 {"sysinit", SYSINIT},
155 {"respawn", RESPAWN},
156 {"askfirst", ASKFIRST},
157 {"wait", WAIT},
158 {"once", ONCE},
Erik Andersene132f4b2000-02-09 04:16:43 +0000159 {"ctrlaltdel", CTRLALTDEL},
Pavel Roskin9027bcf2000-07-14 15:44:25 +0000160 {0, 0}
Erik Andersen7dc16072000-01-04 01:10:25 +0000161};
162
Erik Andersen42094cd2000-03-20 21:34:52 +0000163/* Set up a linked list of initActions, to be read from inittab */
Erik Andersen7dc16072000-01-04 01:10:25 +0000164typedef struct initActionTag initAction;
165struct initActionTag {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000166 pid_t pid;
167 char process[256];
168 char console[256];
169 initAction *nextPtr;
170 initActionEnum action;
Erik Andersen7dc16072000-01-04 01:10:25 +0000171};
Erik Andersene49d5ec2000-02-08 19:58:47 +0000172initAction *initActionList = NULL;
Erik Andersen7dc16072000-01-04 01:10:25 +0000173
174
Erik Andersenac6e71f2000-01-08 22:04:33 +0000175static char *secondConsole = VT_SECONDARY;
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000176static char *thirdConsole = VT_THIRD;
177static char *fourthConsole = VT_FOURTH;
Erik Andersen42094cd2000-03-20 21:34:52 +0000178static char *log = VT_LOG;
179static int kernelVersion = 0;
180static char termType[32] = "TERM=linux";
181static char console[32] = _PATH_CONSOLE;
182
Erik Andersene132f4b2000-02-09 04:16:43 +0000183static void delete_initAction(initAction * action);
Eric Andersen0460ff21999-10-25 23:32:44 +0000184
185
Erik Andersen42094cd2000-03-20 21:34:52 +0000186/* Print a message to the specified device.
187 * Device may be bitwise-or'd from LOG | CONSOLE */
188static void message(int device, char *fmt, ...)
Erik Andersen93d65132000-04-06 08:06:36 +0000189 __attribute__ ((format (printf, 2, 3)));
190static void message(int device, char *fmt, ...)
Eric Andersen0460ff21999-10-25 23:32:44 +0000191{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000192 va_list arguments;
193 int fd;
Erik Andersen7dc16072000-01-04 01:10:25 +0000194
Eric Andersen4c781471999-11-26 08:12:56 +0000195#ifdef BB_SYSLOGD
196
Erik Andersene49d5ec2000-02-08 19:58:47 +0000197 /* Log the message to syslogd */
198 if (device & LOG) {
199 char msg[1024];
Eric Andersen4c781471999-11-26 08:12:56 +0000200
Erik Andersene49d5ec2000-02-08 19:58:47 +0000201 va_start(arguments, fmt);
202 vsnprintf(msg, sizeof(msg), fmt, arguments);
203 va_end(arguments);
Erik Andersene132f4b2000-02-09 04:16:43 +0000204 openlog("init", 0, LOG_USER);
205 syslog(LOG_USER|LOG_INFO, msg);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000206 closelog();
Eric Andersen3ae0c781999-11-04 01:13:21 +0000207 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000208#else
209 static int log_fd = -1;
210
211 /* Take full control of the log tty, and never close it.
212 * It's mine, all mine! Muhahahaha! */
213 if (log_fd < 0) {
214 if (log == NULL) {
215 /* don't even try to log, because there is no such console */
216 log_fd = -2;
217 /* log to main console instead */
218 device = CONSOLE;
Erik Andersene132f4b2000-02-09 04:16:43 +0000219 } else if ((log_fd = device_open(log, O_RDWR|O_NDELAY)) < 0) {
220 log_fd = -2;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000221 fprintf(stderr, "Bummer, can't write to log on %s!\r\n", log);
222 fflush(stderr);
Erik Andersene132f4b2000-02-09 04:16:43 +0000223 log = NULL;
224 device = CONSOLE;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000225 }
226 }
227 if ((device & LOG) && (log_fd >= 0)) {
228 va_start(arguments, fmt);
229 vdprintf(log_fd, fmt, arguments);
230 va_end(arguments);
231 }
Eric Andersen4c781471999-11-26 08:12:56 +0000232#endif
233
Erik Andersene49d5ec2000-02-08 19:58:47 +0000234 if (device & CONSOLE) {
235 /* Always send console messages to /dev/console so people will see them. */
236 if (
237 (fd =
238 device_open(_PATH_CONSOLE,
239 O_WRONLY | O_NOCTTY | O_NDELAY)) >= 0) {
240 va_start(arguments, fmt);
241 vdprintf(fd, fmt, arguments);
242 va_end(arguments);
243 close(fd);
244 } else {
245 fprintf(stderr, "Bummer, can't print: ");
246 va_start(arguments, fmt);
247 vfprintf(stderr, fmt, arguments);
248 fflush(stderr);
249 va_end(arguments);
250 }
Eric Andersen3ae0c781999-11-04 01:13:21 +0000251 }
Eric Andersencc8ed391999-10-05 16:24:54 +0000252}
253
Eric Andersen0460ff21999-10-25 23:32:44 +0000254/* Set terminal settings to reasonable defaults */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000255void set_term(int fd)
Eric Andersencc8ed391999-10-05 16:24:54 +0000256{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000257 struct termios tty;
Eric Andersencc8ed391999-10-05 16:24:54 +0000258
Erik Andersene49d5ec2000-02-08 19:58:47 +0000259 tcgetattr(fd, &tty);
Eric Andersencc8ed391999-10-05 16:24:54 +0000260
Erik Andersene49d5ec2000-02-08 19:58:47 +0000261 /* set control chars */
Eric Andersen3849f9b2000-07-10 19:56:47 +0000262 tty.c_cc[VINTR] = 3; /* C-c */
263 tty.c_cc[VQUIT] = 28; /* C-\ */
264 tty.c_cc[VERASE] = 127; /* C-? */
265 tty.c_cc[VKILL] = 21; /* C-u */
266 tty.c_cc[VEOF] = 4; /* C-d */
267 tty.c_cc[VSTART] = 17; /* C-q */
268 tty.c_cc[VSTOP] = 19; /* C-s */
269 tty.c_cc[VSUSP] = 26; /* C-z */
Eric Andersen02bc25b2000-07-06 21:29:32 +0000270
Erik Andersene49d5ec2000-02-08 19:58:47 +0000271 /* use line dicipline 0 */
272 tty.c_line = 0;
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000273
Erik Andersene49d5ec2000-02-08 19:58:47 +0000274 /* Make it be sane */
Erik Andersen6c41c442000-03-19 05:13:49 +0000275 tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD;
276 tty.c_cflag |= HUPCL|CLOCAL;
Eric Andersen08b10341999-11-19 02:38:58 +0000277
Erik Andersene49d5ec2000-02-08 19:58:47 +0000278 /* input modes */
279 tty.c_iflag = ICRNL | IXON | IXOFF;
Eric Andersen08b10341999-11-19 02:38:58 +0000280
Erik Andersene49d5ec2000-02-08 19:58:47 +0000281 /* output modes */
282 tty.c_oflag = OPOST | ONLCR;
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000283
Erik Andersene49d5ec2000-02-08 19:58:47 +0000284 /* local modes */
285 tty.c_lflag =
286 ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN;
Eric Andersencc8ed391999-10-05 16:24:54 +0000287
Erik Andersene49d5ec2000-02-08 19:58:47 +0000288 tcsetattr(fd, TCSANOW, &tty);
Eric Andersencc8ed391999-10-05 16:24:54 +0000289}
290
Eric Andersen219d6f51999-11-02 19:43:01 +0000291/* How much memory does this machine have? */
Erik Andersend07ee462000-02-21 21:26:32 +0000292static int check_free_memory()
Eric Andersencc8ed391999-10-05 16:24:54 +0000293{
Erik Andersend07ee462000-02-21 21:26:32 +0000294 struct sysinfo info;
Eric Andersencc8ed391999-10-05 16:24:54 +0000295
Eric Andersen10dc9d42000-06-26 10:45:52 +0000296 /* Pre initialize mem_unit in case this kernel is something prior to
297 * the linux 2.4 kernel (which will actually fill in mem_unit... */
Erik Andersend07ee462000-02-21 21:26:32 +0000298 sysinfo(&info);
299 if (sysinfo(&info) != 0) {
Eric Andersen10dc9d42000-06-26 10:45:52 +0000300 printf("Error checking free memory: %s\n", strerror(errno));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000301 return -1;
Eric Andersenabc7d591999-10-19 00:27:50 +0000302 }
Eric Andersencbb61c72000-09-10 16:13:41 +0000303 /* Kernels prior to 2.4.x will return info.mem_unit==0, so cope... */
Eric Andersen10dc9d42000-06-26 10:45:52 +0000304 if (info.mem_unit==0) {
Eric Andersencbb61c72000-09-10 16:13:41 +0000305 info.mem_unit=1;
Eric Andersen10dc9d42000-06-26 10:45:52 +0000306 }
Eric Andersencbb61c72000-09-10 16:13:41 +0000307 info.mem_unit*=1024;
308
309 /* Note: These values can in theory overflow a 32 bit unsigned long (i.e.
310 * mem >= Gib), but who puts more then 4GiB ram+swap on an embedded
311 * system? */
312 info.totalram/=info.mem_unit;
313 info.totalswap/=info.mem_unit;
Eric Andersen10dc9d42000-06-26 10:45:52 +0000314 return(info.totalram+info.totalswap);
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{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000399 int i, fd;
400 pid_t pid;
401 char *tmpCmd;
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000402 char *cmd[255], *cmdpath;
Erik Andersene132f4b2000-02-09 04:16:43 +0000403 char buf[255];
Erik Andersene49d5ec2000-02-08 19:58:47 +0000404 static const char press_enter[] =
405
406 "\nPlease press Enter to activate this console. ";
407 char *environment[] = {
408 "HOME=/",
409 "PATH=/usr/bin:/bin:/usr/sbin:/sbin",
410 "SHELL=/bin/sh",
411 termType,
412 "USER=root",
413 0
414 };
Erik Andersenac6e71f2000-01-08 22:04:33 +0000415
Erik Andersene49d5ec2000-02-08 19:58:47 +0000416 if ((pid = fork()) == 0) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000417 /* Clean up */
Eric Andersenfb6a5082000-09-13 16:15:29 +0000418 ioctl(0, TIOCNOTTY, 0);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000419 close(0);
420 close(1);
421 close(2);
422 setsid();
Eric Andersen0460ff21999-10-25 23:32:44 +0000423
Erik Andersene49d5ec2000-02-08 19:58:47 +0000424 /* Reset signal handlers set for parent process */
425 signal(SIGUSR1, SIG_DFL);
426 signal(SIGUSR2, SIG_DFL);
427 signal(SIGINT, SIG_DFL);
428 signal(SIGTERM, SIG_DFL);
429 signal(SIGHUP, SIG_DFL);
Eric Andersen2f6c04f1999-11-01 23:59:44 +0000430
Erik Andersene49d5ec2000-02-08 19:58:47 +0000431 if ((fd = device_open(terminal, O_RDWR)) < 0) {
432 message(LOG | CONSOLE, "Bummer, can't open %s\r\n", terminal);
433 exit(1);
434 }
435 dup2(fd, 0);
436 dup2(fd, 1);
437 dup2(fd, 2);
Eric Andersenfb6a5082000-09-13 16:15:29 +0000438 ioctl(0, TIOCSCTTY, 1);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000439 tcsetpgrp(0, getpgrp());
440 set_term(0);
441
442 if (get_enter == TRUE) {
443 /*
444 * Save memory by not exec-ing anything large (like a shell)
445 * before the user wants it. This is critical if swap is not
446 * enabled and the system has low memory. Generally this will
447 * be run on the second virtual console, and the first will
448 * be allowed to start a shell or whatever an init script
449 * specifies.
450 */
Erik Andersene132f4b2000-02-09 04:16:43 +0000451#ifdef DEBUG_INIT
Erik Andersen2ac2fae2000-03-07 23:32:17 +0000452 pid_t shell_pgid = getpid();
Erik Andersene49d5ec2000-02-08 19:58:47 +0000453 message(LOG, "Waiting for enter to start '%s' (pid %d, console %s)\r\n",
454 command, shell_pgid, terminal);
Erik Andersene132f4b2000-02-09 04:16:43 +0000455#endif
Erik Andersene49d5ec2000-02-08 19:58:47 +0000456 write(fileno(stdout), press_enter, sizeof(press_enter) - 1);
Pavel Roskincbe05e42000-09-14 22:47:29 +0000457 getc(stdin);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000458 }
459
Erik Andersene49d5ec2000-02-08 19:58:47 +0000460#ifdef DEBUG_INIT
Erik Andersene132f4b2000-02-09 04:16:43 +0000461 /* Log the process name and args */
462 message(LOG, "Starting pid %d, console %s: '%s'\r\n",
463 shell_pgid, terminal, command);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000464#endif
Erik Andersene132f4b2000-02-09 04:16:43 +0000465
466 /* See if any special /bin/sh requiring characters are present */
467 if (strpbrk(command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
468 cmd[0] = SHELL;
469 cmd[1] = "-c";
470 strcpy(buf, "exec ");
471 strncat(buf, command, sizeof(buf) - strlen(buf) - 1);
472 cmd[2] = buf;
473 cmd[3] = NULL;
474 } else {
475 /* Convert command (char*) into cmd (char**, one word per string) */
476 for (tmpCmd = command, i = 0;
477 (tmpCmd = strsep(&command, " \t")) != NULL;) {
478 if (*tmpCmd != '\0') {
479 cmd[i] = tmpCmd;
480 tmpCmd++;
481 i++;
482 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000483 }
Erik Andersene132f4b2000-02-09 04:16:43 +0000484 cmd[i] = NULL;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000485 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000486
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000487 cmdpath = cmd[0];
488
489 /*
490 Interactive shells want to see a dash in argv[0]. This
491 typically is handled by login, argv will be setup this
492 way if a dash appears at the front of the command path
493 (like "-/bin/sh").
494 */
495
496 if (*cmdpath == '-') {
497 char *s;
498
499 /* skip over the dash */
500 ++cmdpath;
501
502 /* find the last component in the command pathname */
503 s = get_last_path_component(cmdpath);
504
505 /* make a new argv[0] */
506 if ((cmd[0] = malloc(strlen(s)+2)) == NULL) {
507 message(LOG | CONSOLE, "malloc failed");
508 cmd[0] = cmdpath;
509 } else {
510 cmd[0][0] = '-';
511 strcpy(cmd[0]+1, s);
512 }
513 }
514
Erik Andersen183da4a2000-04-04 18:36:37 +0000515#if defined BB_FEATURE_INIT_COREDUMPS
Erik Andersen983b51b2000-04-04 18:14:25 +0000516 {
517 struct stat sb;
518 if (stat (CORE_ENABLE_FLAG_FILE, &sb) == 0) {
519 struct rlimit limit;
520 limit.rlim_cur = RLIM_INFINITY;
521 limit.rlim_max = RLIM_INFINITY;
522 setrlimit(RLIMIT_CORE, &limit);
523 }
524 }
Erik Andersen183da4a2000-04-04 18:36:37 +0000525#endif
Erik Andersen983b51b2000-04-04 18:14:25 +0000526
Erik Andersene49d5ec2000-02-08 19:58:47 +0000527 /* Now run it. The new program will take over this PID,
528 * so nothing further in init.c should be run. */
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000529 execve(cmdpath, cmd, environment);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000530
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000531 /* We're still here? Some error happened. */
532 message(LOG | CONSOLE, "Bummer, could not run '%s': %s\n", cmdpath,
533 strerror(errno));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000534 exit(-1);
Erik Andersen05df2392000-01-13 04:43:48 +0000535 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000536 return pid;
Eric Andersen0460ff21999-10-25 23:32:44 +0000537}
538
Erik Andersene49d5ec2000-02-08 19:58:47 +0000539static int waitfor(char *command, char *terminal, int get_enter)
Erik Andersen0e3782f2000-01-07 02:54:55 +0000540{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000541 int status, wpid;
542 int pid = run(command, terminal, get_enter);
Erik Andersen0e3782f2000-01-07 02:54:55 +0000543
Erik Andersene49d5ec2000-02-08 19:58:47 +0000544 while (1) {
545 wpid = wait(&status);
Erik Andersene132f4b2000-02-09 04:16:43 +0000546 if (wpid > 0 && wpid != pid) {
547 continue;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000548 }
549 if (wpid == pid)
550 break;
Erik Andersen0e3782f2000-01-07 02:54:55 +0000551 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000552 return wpid;
Erik Andersen0e3782f2000-01-07 02:54:55 +0000553}
554
Eric Andersen219d6f51999-11-02 19:43:01 +0000555/* Make sure there is enough memory to do something useful. *
Erik Andersene132f4b2000-02-09 04:16:43 +0000556 * Calls "swapon -a" if needed so be sure /etc/fstab is present... */
Eric Andersen219d6f51999-11-02 19:43:01 +0000557static void check_memory()
558{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000559 struct stat statBuf;
Eric Andersen219d6f51999-11-02 19:43:01 +0000560
Erik Andersend07ee462000-02-21 21:26:32 +0000561 if (check_free_memory() > 1000)
Erik Andersene49d5ec2000-02-08 19:58:47 +0000562 return;
563
564 if (stat("/etc/fstab", &statBuf) == 0) {
Erik Andersen61677fe2000-04-13 01:18:56 +0000565 /* swapon -a requires /proc typically */
566 waitfor("mount proc /proc -t proc", console, FALSE);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000567 /* Try to turn on swap */
Erik Andersen61677fe2000-04-13 01:18:56 +0000568 waitfor("swapon -a", console, FALSE);
Erik Andersend07ee462000-02-21 21:26:32 +0000569 if (check_free_memory() < 1000)
Erik Andersene49d5ec2000-02-08 19:58:47 +0000570 goto goodnight;
571 } else
572 goto goodnight;
Eric Andersen219d6f51999-11-02 19:43:01 +0000573 return;
574
Erik Andersene49d5ec2000-02-08 19:58:47 +0000575 goodnight:
576 message(CONSOLE,
577 "Sorry, your computer does not have enough memory.\r\n");
578 while (1)
579 sleep(1);
Eric Andersen219d6f51999-11-02 19:43:01 +0000580}
581
Erik Andersene132f4b2000-02-09 04:16:43 +0000582/* Run all commands to be run right before halt/reboot */
583static void run_lastAction(void)
584{
585 initAction *a;
586 for (a = initActionList; a; a = a->nextPtr) {
587 if (a->action == CTRLALTDEL) {
588 waitfor(a->process, a->console, FALSE);
589 delete_initAction(a);
590 }
591 }
592}
593
594
Erik Andersen7dc16072000-01-04 01:10:25 +0000595#ifndef DEBUG_INIT
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000596static void shutdown_system(void)
Eric Andersencc8ed391999-10-05 16:24:54 +0000597{
Erik Andersene132f4b2000-02-09 04:16:43 +0000598
Erik Andersene49d5ec2000-02-08 19:58:47 +0000599 /* first disable our SIGHUP signal */
600 signal(SIGHUP, SIG_DFL);
Erik Andersen7dc16072000-01-04 01:10:25 +0000601
Erik Andersene49d5ec2000-02-08 19:58:47 +0000602 /* Allow Ctrl-Alt-Del to reboot system. */
Erik Andersen4f3f7572000-04-28 00:18:56 +0000603 init_reboot(RB_ENABLE_CAD);
Erik Andersene132f4b2000-02-09 04:16:43 +0000604
605 message(CONSOLE|LOG, "\r\nThe system is going down NOW !!\r\n");
Eric Andersencf8c9cf1999-11-05 00:31:46 +0000606 sync();
Erik Andersene49d5ec2000-02-08 19:58:47 +0000607
608 /* Send signals to every process _except_ pid 1 */
Erik Andersene132f4b2000-02-09 04:16:43 +0000609 message(CONSOLE|LOG, "Sending SIGTERM to all processes.\r\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000610 kill(-1, SIGTERM);
Erik Andersene132f4b2000-02-09 04:16:43 +0000611 sleep(1);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000612 sync();
613
Erik Andersene132f4b2000-02-09 04:16:43 +0000614 message(CONSOLE|LOG, "Sending SIGKILL to all processes.\r\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000615 kill(-1, SIGKILL);
Erik Andersene132f4b2000-02-09 04:16:43 +0000616 sleep(1);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000617
Erik Andersene132f4b2000-02-09 04:16:43 +0000618 /* run everything to be run at "ctrlaltdel" */
619 run_lastAction();
620
Erik Andersene49d5ec2000-02-08 19:58:47 +0000621 sync();
Eric Andersenbd22ed82000-07-08 18:55:24 +0000622 if (kernelVersion > 0 && kernelVersion <= KERNEL_VERSION(2,2,11)) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000623 /* bdflush, kupdate not needed for kernels >2.2.11 */
624 bdflush(1, 0);
625 sync();
626 }
Eric Andersencc8ed391999-10-05 16:24:54 +0000627}
628
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000629static void halt_signal(int sig)
Eric Andersencc8ed391999-10-05 16:24:54 +0000630{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000631 shutdown_system();
Erik Andersene132f4b2000-02-09 04:16:43 +0000632 message(CONSOLE|LOG,
Erik Andersene49d5ec2000-02-08 19:58:47 +0000633 "The system is halted. Press %s or turn off power\r\n",
634 (secondConsole == NULL) /* serial console */
635 ? "Reset" : "CTRL-ALT-DEL");
636 sync();
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000637
Erik Andersene49d5ec2000-02-08 19:58:47 +0000638 /* allow time for last message to reach serial console */
Erik Andersene132f4b2000-02-09 04:16:43 +0000639 sleep(2);
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000640
Eric Andersenbd22ed82000-07-08 18:55:24 +0000641 if (sig == SIGUSR2 && kernelVersion >= KERNEL_VERSION(2,2,0))
Erik Andersen4f3f7572000-04-28 00:18:56 +0000642 init_reboot(RB_POWER_OFF);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000643 else
Erik Andersen4f3f7572000-04-28 00:18:56 +0000644 init_reboot(RB_HALT_SYSTEM);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000645 exit(0);
Eric Andersencc8ed391999-10-05 16:24:54 +0000646}
647
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000648static void reboot_signal(int sig)
Eric Andersencc8ed391999-10-05 16:24:54 +0000649{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000650 shutdown_system();
Erik Andersene132f4b2000-02-09 04:16:43 +0000651 message(CONSOLE|LOG, "Please stand by while rebooting the system.\r\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000652 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 */
655 sleep(2);
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000656
Erik Andersen4f3f7572000-04-28 00:18:56 +0000657 init_reboot(RB_AUTOBOOT);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000658 exit(0);
Eric Andersencc8ed391999-10-05 16:24:54 +0000659}
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000660
Erik Andersende552872000-01-23 01:34:05 +0000661#if defined BB_FEATURE_INIT_CHROOT
Erik Andersend07ee462000-02-21 21:26:32 +0000662
663#if ! defined BB_FEATURE_USE_PROCFS
664#error Sorry, I depend on the /proc filesystem right now.
665#endif
666
Erik Andersende552872000-01-23 01:34:05 +0000667static void check_chroot(int sig)
668{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000669 char *argv_init[2] = { "init", NULL, };
670 char *envp_init[3] = { "HOME=/", "TERM=linux", NULL, };
671 char rootpath[256], *tc;
672 int fd;
Erik Andersende552872000-01-23 01:34:05 +0000673
Erik Andersene49d5ec2000-02-08 19:58:47 +0000674 if ((fd = open("/proc/sys/kernel/init-chroot", O_RDONLY)) == -1) {
675 message(CONSOLE,
676 "SIGHUP recived, but could not open proc file\r\n");
677 sleep(2);
678 return;
679 }
680 if (read(fd, rootpath, sizeof(rootpath)) == -1) {
681 message(CONSOLE,
682 "SIGHUP recived, but could not read proc file\r\n");
683 sleep(2);
684 return;
685 }
686 close(fd);
687
688 if (rootpath[0] == '\0') {
689 message(CONSOLE,
690 "SIGHUP recived, but new root is not valid: %s\r\n",
691 rootpath);
692 sleep(2);
693 return;
694 }
695
696 tc = strrchr(rootpath, '\n');
697 *tc = '\0';
698
699 /* Ok, making it this far means we commit */
700 message(CONSOLE, "Please stand by, changing root to `%s'.\r\n",
701 rootpath);
702
703 /* kill all other programs first */
704 message(CONSOLE, "Sending SIGTERM to all processes.\r\n");
705 kill(-1, SIGTERM);
Erik Andersende552872000-01-23 01:34:05 +0000706 sleep(2);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000707 sync();
708
709 message(CONSOLE, "Sending SIGKILL to all processes.\r\n");
710 kill(-1, SIGKILL);
Erik Andersende552872000-01-23 01:34:05 +0000711 sleep(2);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000712 sync();
713
714 /* ok, we don't need /proc anymore. we also assume that the signaling
715 * process left the rest of the filesystems alone for us */
716 umount("/proc");
717
718 /* Ok, now we chroot. Hopefully we only have two things mounted, the
719 * new chroot'd mount point, and the old "/" mount. s,
720 * we go ahead and unmount the old "/". This should trigger the kernel
721 * to set things up the Right Way(tm). */
722
723 if (!chroot(rootpath))
724 umount("/dev/root");
725
726 /* If the chroot fails, we are already too far to turn back, so we
727 * continue and hope that executing init below will revive the system */
728
729 /* close all of our descriptors and open new ones */
730 close(0);
731 close(1);
732 close(2);
733 open("/dev/console", O_RDWR, 0);
734 dup(0);
735 dup(0);
736
737 message(CONSOLE, "Executing real init...\r\n");
738 /* execute init in the (hopefully) new root */
739 execve("/sbin/init", argv_init, envp_init);
740
741 message(CONSOLE,
742 "ERROR: Could not exec new init. Press %s to reboot.\r\n",
743 (secondConsole == NULL) /* serial console */
744 ? "Reset" : "CTRL-ALT-DEL");
Erik Andersende552872000-01-23 01:34:05 +0000745 return;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000746}
747#endif /* BB_FEATURE_INIT_CHROOT */
Erik Andersende552872000-01-23 01:34:05 +0000748
Erik Andersene49d5ec2000-02-08 19:58:47 +0000749#endif /* ! DEBUG_INIT */
Erik Andersende552872000-01-23 01:34:05 +0000750
Erik Andersene49d5ec2000-02-08 19:58:47 +0000751void new_initAction(initActionEnum action, char *process, char *cons)
Erik Andersen7dc16072000-01-04 01:10:25 +0000752{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000753 initAction *newAction;
Erik Andersen9e737252000-01-06 01:16:13 +0000754
Erik Andersene49d5ec2000-02-08 19:58:47 +0000755 if (*cons == '\0')
756 cons = console;
Erik Andersen9e737252000-01-06 01:16:13 +0000757
Erik Andersene49d5ec2000-02-08 19:58:47 +0000758 /* If BusyBox detects that a serial console is in use,
759 * then entries not refering to the console or null devices will _not_ be run.
760 * The exception to this rule is the null device.
761 */
762 if (secondConsole == NULL && strcmp(cons, console)
763 && strcmp(cons, "/dev/null"))
764 return;
765
766 newAction = calloc((size_t) (1), sizeof(initAction));
767 if (!newAction) {
768 message(LOG | CONSOLE, "Memory allocation failure\n");
769 while (1)
770 sleep(1);
771 }
772 newAction->nextPtr = initActionList;
773 initActionList = newAction;
774 strncpy(newAction->process, process, 255);
775 newAction->action = action;
776 strncpy(newAction->console, cons, 255);
777 newAction->pid = 0;
Erik Andersen31638212000-01-15 22:28:50 +0000778// message(LOG|CONSOLE, "process='%s' action='%d' console='%s'\n",
Erik Andersene49d5ec2000-02-08 19:58:47 +0000779// newAction->process, newAction->action, newAction->console);
Erik Andersen7dc16072000-01-04 01:10:25 +0000780}
781
Erik Andersene132f4b2000-02-09 04:16:43 +0000782static void delete_initAction(initAction * action)
Erik Andersen7dc16072000-01-04 01:10:25 +0000783{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000784 initAction *a, *b = NULL;
785
786 for (a = initActionList; a; b = a, a = a->nextPtr) {
787 if (a == action) {
788 if (b == NULL) {
789 initActionList = a->nextPtr;
790 } else {
791 b->nextPtr = a->nextPtr;
792 }
793 free(a);
794 break;
795 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000796 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000797}
798
Erik Andersen9e737252000-01-06 01:16:13 +0000799/* NOTE that if BB_FEATURE_USE_INITTAB is NOT defined,
800 * then parse_inittab() simply adds in some default
801 * actions(i.e runs INIT_SCRIPT and then starts a pair
Erik Andersen812d4662000-01-07 18:30:40 +0000802 * of "askfirst" shells). If BB_FEATURE_USE_INITTAB
803 * _is_ defined, but /etc/inittab is missing, this
804 * results in the same set of default behaviors.
Erik Andersen9e737252000-01-06 01:16:13 +0000805 * */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000806void parse_inittab(void)
Erik Andersen7dc16072000-01-04 01:10:25 +0000807{
Erik Andersen9e737252000-01-06 01:16:13 +0000808#ifdef BB_FEATURE_USE_INITTAB
Erik Andersene49d5ec2000-02-08 19:58:47 +0000809 FILE *file;
810 char buf[256], lineAsRead[256], tmpConsole[256];
Eric Andersenb5966362000-05-31 20:04:38 +0000811 char *id, *runlev, *action, *process, *eol;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000812 const struct initActionType *a = actions;
813 int foundIt;
Erik Andersen7dc16072000-01-04 01:10:25 +0000814
815
Erik Andersene49d5ec2000-02-08 19:58:47 +0000816 file = fopen(INITTAB, "r");
817 if (file == NULL) {
818 /* No inittab file -- set up some default behavior */
Erik Andersen9e737252000-01-06 01:16:13 +0000819#endif
Erik Andersene132f4b2000-02-09 04:16:43 +0000820 /* Swapoff on halt/reboot */
Pavel Roskin33bee332000-09-15 01:02:50 +0000821 new_initAction(CTRLALTDEL, "/sbin/swapoff -a", console);
Erik Andersene132f4b2000-02-09 04:16:43 +0000822 /* Umount all filesystems on halt/reboot */
Pavel Roskin33bee332000-09-15 01:02:50 +0000823 new_initAction(CTRLALTDEL, "/bin/umount -a -r", console);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000824 /* Askfirst shell on tty1 */
825 new_initAction(ASKFIRST, SHELL, console);
826 /* Askfirst shell on tty2 */
827 if (secondConsole != NULL)
828 new_initAction(ASKFIRST, SHELL, secondConsole);
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000829 /* Askfirst shell on tty3 */
830 if (thirdConsole != NULL)
831 new_initAction(ASKFIRST, SHELL, thirdConsole);
832 /* Askfirst shell on tty4 */
833 if (fourthConsole != NULL)
834 new_initAction(ASKFIRST, SHELL, fourthConsole);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000835 /* sysinit */
836 new_initAction(SYSINIT, INIT_SCRIPT, console);
Erik Andersen7dc16072000-01-04 01:10:25 +0000837
Erik Andersene49d5ec2000-02-08 19:58:47 +0000838 return;
Erik Andersen9e737252000-01-06 01:16:13 +0000839#ifdef BB_FEATURE_USE_INITTAB
Erik Andersen9e737252000-01-06 01:16:13 +0000840 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000841
Erik Andersene49d5ec2000-02-08 19:58:47 +0000842 while (fgets(buf, 255, file) != NULL) {
843 foundIt = FALSE;
Eric Andersenb5966362000-05-31 20:04:38 +0000844 /* Skip leading spaces */
845 for (id = buf; *id == ' ' || *id == '\t'; id++);
846
847 /* Skip the line if it's a comment */
848 if (*id == '#' || *id == '\n')
Erik Andersene49d5ec2000-02-08 19:58:47 +0000849 continue;
Erik Andersen7dc16072000-01-04 01:10:25 +0000850
Erik Andersene49d5ec2000-02-08 19:58:47 +0000851 /* Trim the trailing \n */
Eric Andersenb5966362000-05-31 20:04:38 +0000852 eol = strrchr(id, '\n');
853 if (eol != NULL)
854 *eol = '\0';
Erik Andersen7dc16072000-01-04 01:10:25 +0000855
Erik Andersene49d5ec2000-02-08 19:58:47 +0000856 /* Keep a copy around for posterity's sake (and error msgs) */
857 strcpy(lineAsRead, buf);
858
Eric Andersenb5966362000-05-31 20:04:38 +0000859 /* Separate the ID field from the runlevels */
860 runlev = strchr(id, ':');
861 if (runlev == NULL || *(runlev + 1) == '\0') {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000862 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
863 continue;
864 } else {
Eric Andersenb5966362000-05-31 20:04:38 +0000865 *runlev = '\0';
866 ++runlev;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000867 }
868
Eric Andersenb5966362000-05-31 20:04:38 +0000869 /* Separate the runlevels from the action */
870 action = strchr(runlev, ':');
871 if (action == NULL || *(action + 1) == '\0') {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000872 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
873 continue;
874 } else {
Eric Andersenb5966362000-05-31 20:04:38 +0000875 *action = '\0';
876 ++action;
877 }
878
879 /* Separate the action from the process */
880 process = strchr(action, ':');
881 if (process == NULL || *(process + 1) == '\0') {
882 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
883 continue;
884 } else {
885 *process = '\0';
886 ++process;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000887 }
888
889 /* Ok, now process it */
890 a = actions;
891 while (a->name != 0) {
Eric Andersenb5966362000-05-31 20:04:38 +0000892 if (strcmp(a->name, action) == 0) {
893 if (*id != '\0') {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000894 struct stat statBuf;
895
896 strcpy(tmpConsole, "/dev/");
Eric Andersenb5966362000-05-31 20:04:38 +0000897 strncat(tmpConsole, id, 200);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000898 if (stat(tmpConsole, &statBuf) != 0) {
899 message(LOG | CONSOLE,
900 "device '%s' does not exist. Did you read the directions?\n",
901 tmpConsole);
902 break;
903 }
Eric Andersenb5966362000-05-31 20:04:38 +0000904 id = tmpConsole;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000905 }
Eric Andersenb5966362000-05-31 20:04:38 +0000906 new_initAction(a->action, process, id);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000907 foundIt = TRUE;
908 }
909 a++;
910 }
911 if (foundIt == TRUE)
912 continue;
913 else {
914 /* Choke on an unknown action */
915 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
916 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000917 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000918 return;
Erik Andersen42094cd2000-03-20 21:34:52 +0000919#endif /* BB_FEATURE_USE_INITTAB */
Erik Andersen7dc16072000-01-04 01:10:25 +0000920}
921
Erik Andersene132f4b2000-02-09 04:16:43 +0000922
923
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000924extern int init_main(int argc, char **argv)
Eric Andersen0460ff21999-10-25 23:32:44 +0000925{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000926 initAction *a;
927 pid_t wpid;
928 int status;
Eric Andersen0460ff21999-10-25 23:32:44 +0000929
Eric Andersend73dc5b1999-11-10 23:13:02 +0000930#ifndef DEBUG_INIT
Erik Andersena51ecdd2000-02-24 18:09:58 +0000931 /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
932 if (getpid() != 1
933#ifdef BB_FEATURE_LINUXRC
Matt Kraaie58771e2000-07-12 15:38:49 +0000934 && strstr(applet_name, "linuxrc") == NULL
Erik Andersena51ecdd2000-02-24 18:09:58 +0000935#endif
936 )
937 {
938 usage("init\n\nInit is the parent of all processes.\n\n"
939 "This version of init is designed to be run only "
940 "by the kernel.\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000941 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000942 /* Set up sig handlers -- be sure to
943 * clear all of these in run() */
944 signal(SIGUSR1, halt_signal);
Eric Andersen4c95a282000-07-07 19:30:28 +0000945 signal(SIGUSR2, halt_signal);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000946 signal(SIGINT, reboot_signal);
947 signal(SIGTERM, reboot_signal);
Erik Andersende552872000-01-23 01:34:05 +0000948#if defined BB_FEATURE_INIT_CHROOT
Erik Andersene49d5ec2000-02-08 19:58:47 +0000949 signal(SIGHUP, check_chroot);
Erik Andersende552872000-01-23 01:34:05 +0000950#endif
Eric Andersen0460ff21999-10-25 23:32:44 +0000951
Erik Andersene49d5ec2000-02-08 19:58:47 +0000952 /* Turn off rebooting via CTL-ALT-DEL -- we get a
953 * SIGINT on CAD so we can shut things down gracefully... */
Erik Andersen4f3f7572000-04-28 00:18:56 +0000954 init_reboot(RB_DISABLE_CAD);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000955#endif
Erik Andersen05df2392000-01-13 04:43:48 +0000956
Erik Andersen298854f2000-03-23 01:09:18 +0000957 /* Figure out what kernel this is running */
958 kernelVersion = get_kernel_revision();
959
Erik Andersene49d5ec2000-02-08 19:58:47 +0000960 /* Figure out where the default console should be */
961 console_init();
Eric Andersen0460ff21999-10-25 23:32:44 +0000962
Erik Andersene49d5ec2000-02-08 19:58:47 +0000963 /* Close whatever files are open, and reset the console. */
964 close(0);
965 close(1);
966 close(2);
967 set_term(0);
Erik Andersen983b51b2000-04-04 18:14:25 +0000968 chdir("/");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000969 setsid();
Eric Andersencc8ed391999-10-05 16:24:54 +0000970
Erik Andersene49d5ec2000-02-08 19:58:47 +0000971 /* Make sure PATH is set to something sane */
972 putenv(_PATH_STDPATH);
Eric Andersencc8ed391999-10-05 16:24:54 +0000973
Erik Andersene49d5ec2000-02-08 19:58:47 +0000974 /* Hello world */
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000975#ifndef DEBUG_INIT
Erik Andersenea6b67d2000-03-07 07:47:10 +0000976 message(
977#if ! defined BB_FEATURE_EXTRA_QUIET
978 CONSOLE|
979#endif
980 LOG,
Pavel Roskin9c5fcc32000-07-17 23:45:12 +0000981 "init started: %s\r\n", full_version);
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000982#else
Erik Andersenea6b67d2000-03-07 07:47:10 +0000983 message(
984#if ! defined BB_FEATURE_EXTRA_QUIET
985 CONSOLE|
986#endif
987 LOG,
Pavel Roskin9c5fcc32000-07-17 23:45:12 +0000988 "init(%d) started: %s\r\n", getpid(), full_version);
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000989#endif
Eric Andersencc8ed391999-10-05 16:24:54 +0000990
Eric Andersencc8ed391999-10-05 16:24:54 +0000991
Erik Andersene49d5ec2000-02-08 19:58:47 +0000992 /* Make sure there is enough memory to do something useful. */
993 check_memory();
Erik Andersen9e737252000-01-06 01:16:13 +0000994
Erik Andersene49d5ec2000-02-08 19:58:47 +0000995 /* Check if we are supposed to be in single user mode */
996 if (argc > 1 && (!strcmp(argv[1], "single") ||
997 !strcmp(argv[1], "-s") || !strcmp(argv[1], "1"))) {
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000998 /* Ask first then start a shell on tty2-4 */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000999 if (secondConsole != NULL)
1000 new_initAction(ASKFIRST, SHELL, secondConsole);
Eric Andersen7e3bf6e2000-09-14 22:01:31 +00001001 if (thirdConsole != NULL)
1002 new_initAction(ASKFIRST, SHELL, thirdConsole);
1003 if (fourthConsole != NULL)
1004 new_initAction(ASKFIRST, SHELL, fourthConsole);
Erik Andersene49d5ec2000-02-08 19:58:47 +00001005 /* Start a shell on tty1 */
1006 new_initAction(RESPAWN, SHELL, console);
1007 } else {
1008 /* Not in single user mode -- see what inittab says */
Eric Andersen8a8fbb81999-10-26 00:18:56 +00001009
Erik Andersene49d5ec2000-02-08 19:58:47 +00001010 /* NOTE that if BB_FEATURE_USE_INITTAB is NOT defined,
1011 * then parse_inittab() simply adds in some default
1012 * actions(i.e runs INIT_SCRIPT and then starts a pair
1013 * of "askfirst" shells */
1014 parse_inittab();
Eric Andersend00c2621999-12-07 08:37:31 +00001015 }
Erik Andersen983b51b2000-04-04 18:14:25 +00001016
Erik Andersene132f4b2000-02-09 04:16:43 +00001017 /* Fix up argv[0] to be certain we claim to be init */
Eric Andersenf34aa4c2000-09-21 02:32:11 +00001018 argv[0]="init";
1019
Erik Andersen07f56042000-02-09 06:05:01 +00001020 if (argc > 1)
1021 strncpy(argv[1], "\0", strlen(argv[1])+1);
Eric Andersen219d6f51999-11-02 19:43:01 +00001022
Erik Andersene49d5ec2000-02-08 19:58:47 +00001023 /* Now run everything that needs to be run */
1024
1025 /* First run the sysinit command */
1026 for (a = initActionList; a; a = a->nextPtr) {
1027 if (a->action == SYSINIT) {
1028 waitfor(a->process, a->console, FALSE);
1029 /* Now remove the "sysinit" entry from the list */
1030 delete_initAction(a);
Erik Andersen7dc16072000-01-04 01:10:25 +00001031 }
Erik Andersen7dc16072000-01-04 01:10:25 +00001032 }
Erik Andersene49d5ec2000-02-08 19:58:47 +00001033 /* Next run anything that wants to block */
1034 for (a = initActionList; a; a = a->nextPtr) {
1035 if (a->action == WAIT) {
1036 waitfor(a->process, a->console, FALSE);
1037 /* Now remove the "wait" entry from the list */
1038 delete_initAction(a);
Erik Andersen7dc16072000-01-04 01:10:25 +00001039 }
Eric Andersen8a8fbb81999-10-26 00:18:56 +00001040 }
Erik Andersene49d5ec2000-02-08 19:58:47 +00001041 /* Next run anything to be run only once */
1042 for (a = initActionList; a; a = a->nextPtr) {
1043 if (a->action == ONCE) {
1044 run(a->process, a->console, FALSE);
1045 /* Now remove the "once" entry from the list */
1046 delete_initAction(a);
1047 }
1048 }
1049 /* If there is nothing else to do, stop */
1050 if (initActionList == NULL) {
1051 message(LOG | CONSOLE,
1052 "No more tasks for init -- sleeping forever.\n");
1053 while (1)
1054 sleep(1);
1055 }
1056
1057 /* Now run the looping stuff for the rest of forever */
1058 while (1) {
1059 for (a = initActionList; a; a = a->nextPtr) {
1060 /* Only run stuff with pid==0. If they have
1061 * a pid, that means they are still running */
1062 if (a->pid == 0) {
1063 switch (a->action) {
1064 case RESPAWN:
1065 /* run the respawn stuff */
1066 a->pid = run(a->process, a->console, FALSE);
1067 break;
1068 case ASKFIRST:
1069 /* run the askfirst stuff */
1070 a->pid = run(a->process, a->console, TRUE);
1071 break;
1072 /* silence the compiler's incessant whining */
1073 default:
1074 break;
1075 }
1076 }
1077 }
1078 /* Wait for a child process to exit */
1079 wpid = wait(&status);
1080 if (wpid > 0) {
1081 /* Find out who died and clean up their corpse */
1082 for (a = initActionList; a; a = a->nextPtr) {
1083 if (a->pid == wpid) {
1084 a->pid = 0;
1085 message(LOG,
1086 "Process '%s' (pid %d) exited. Scheduling it for restart.\n",
1087 a->process, wpid);
1088 }
1089 }
1090 }
1091 sleep(1);
1092 }
Eric Andersencc8ed391999-10-05 16:24:54 +00001093}
Erik Andersen029011b2000-03-04 21:19:32 +00001094
1095/*
1096Local Variables:
1097c-file-style: "linux"
1098c-basic-offset: 4
1099tab-width: 4
1100End:
1101*/