blob: 17273afcd309e9cc7f8fbe46e10847263b9e593c [file] [log] [blame]
Erik Andersenccc74882000-01-27 02:40:21 +00001/* vi: set sw=4 ts=4: */
Eric Andersenc4996011999-10-20 22:08:37 +00002/*
3 * Mini init implementation for busybox
4 *
5 *
6 * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
7 * Adjusted by so many folks, it's impossible to keep track.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 *
23 */
24
Erik Andersene132f4b2000-02-09 04:16:43 +000025/* Turn this on to disable all the dangerous
26 rebooting stuff when debugging.
27#define DEBUG_INIT
28*/
29
Erik Andersen4f3f7572000-04-28 00:18:56 +000030#include <stdio.h>
31#include <stdlib.h>
Eric Andersencc8ed391999-10-05 16:24:54 +000032#include <errno.h>
Eric Andersenb186d981999-12-03 09:19:54 +000033#include <paths.h>
Erik Andersen42094cd2000-03-20 21:34:52 +000034#include <signal.h>
35#include <stdarg.h>
Eric Andersencc8ed391999-10-05 16:24:54 +000036#include <string.h>
Erik Andersen4f3f7572000-04-28 00:18:56 +000037#include <termios.h>
38#include <unistd.h>
Eric Andersened3ef502001-01-27 08:24:39 +000039#include <limits.h>
Erik Andersen42094cd2000-03-20 21:34:52 +000040#include <sys/fcntl.h>
41#include <sys/ioctl.h>
Eric Andersencc8ed391999-10-05 16:24:54 +000042#include <sys/mount.h>
Erik Andersen42094cd2000-03-20 21:34:52 +000043#include <sys/types.h>
Erik Andersen42094cd2000-03-20 21:34:52 +000044#include <sys/wait.h>
Eric Andersencbe31da2001-02-20 06:14:08 +000045#include "busybox.h"
Erik Andersen4f3f7572000-04-28 00:18:56 +000046#ifdef BB_SYSLOGD
47# include <sys/syslog.h>
48#endif
49
Pavel Roskin9c5fcc32000-07-17 23:45:12 +000050
Eric Andersenbd22ed82000-07-08 18:55:24 +000051/* From <linux/vt.h> */
52struct vt_stat {
53 unsigned short v_active; /* active vt */
54 unsigned short v_signal; /* signal to send */
55 unsigned short v_state; /* vt bitmask */
56};
Mark Whitley59ab0252001-01-23 22:30:04 +000057static const int VT_GETSTATE = 0x5603; /* get global vt state info */
Eric Andersenbd22ed82000-07-08 18:55:24 +000058
59/* From <linux/serial.h> */
60struct serial_struct {
61 int type;
62 int line;
63 int port;
64 int irq;
65 int flags;
66 int xmit_fifo_size;
67 int custom_divisor;
68 int baud_base;
69 unsigned short close_delay;
70 char reserved_char[2];
71 int hub6;
72 unsigned short closing_wait; /* time to wait before closing */
73 unsigned short closing_wait2; /* no longer used... */
74 int reserved[4];
75};
76
77
Erik Andersen4f3f7572000-04-28 00:18:56 +000078
79#ifndef RB_HALT_SYSTEM
Mark Whitley59ab0252001-01-23 22:30:04 +000080static const int RB_HALT_SYSTEM = 0xcdef0123;
81static const int RB_ENABLE_CAD = 0x89abcdef;
82static const int RB_DISABLE_CAD = 0;
Erik Andersen4f3f7572000-04-28 00:18:56 +000083#define RB_POWER_OFF 0x4321fedc
Mark Whitley59ab0252001-01-23 22:30:04 +000084static const int RB_AUTOBOOT = 0x01234567;
Eric Andersen2f2da902001-04-09 23:54:15 +000085#endif
Eric Andersenb6b519b2001-04-09 23:52:18 +000086
Eric Andersen8d79ce82001-07-22 23:00:15 +000087#if (__GNU_LIBRARY__ > 5) || defined(__dietlibc__)
Eric Andersenb6b519b2001-04-09 23:52:18 +000088 #include <sys/reboot.h>
Erik Andersen4f3f7572000-04-28 00:18:56 +000089 #define init_reboot(magic) reboot(magic)
90#else
91 #define init_reboot(magic) reboot(0xfee1dead, 672274793, magic)
92#endif
Erik Andersen4f3f7572000-04-28 00:18:56 +000093
Eric Andersen41492d62001-02-23 00:05:56 +000094#ifndef _PATH_STDPATH
Erik Andersen4f3f7572000-04-28 00:18:56 +000095#define _PATH_STDPATH "/usr/bin:/bin:/usr/sbin:/sbin"
Eric Andersen41492d62001-02-23 00:05:56 +000096#endif
Eric Andersencc8ed391999-10-05 16:24:54 +000097
Erik Andersen983b51b2000-04-04 18:14:25 +000098
Erik Andersen183da4a2000-04-04 18:36:37 +000099#if defined BB_FEATURE_INIT_COREDUMPS
Erik Andersen983b51b2000-04-04 18:14:25 +0000100/*
Erik Andersen183da4a2000-04-04 18:36:37 +0000101 * When a file named CORE_ENABLE_FLAG_FILE exists, setrlimit is called
102 * before processes are spawned to set core file size as unlimited.
103 * This is for debugging only. Don't use this is production, unless
104 * you want core dumps lying about....
Erik Andersen983b51b2000-04-04 18:14:25 +0000105 */
106#define CORE_ENABLE_FLAG_FILE "/.init_enable_core"
107#include <sys/resource.h>
108#include <sys/time.h>
Erik Andersen183da4a2000-04-04 18:36:37 +0000109#endif
Erik Andersen983b51b2000-04-04 18:14:25 +0000110
Erik Andersen4d1d0111999-12-17 18:44:15 +0000111#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
Erik Andersen4d1d0111999-12-17 18:44:15 +0000112
Eric Andersenb6b519b2001-04-09 23:52:18 +0000113#if __GNU_LIBRARY__ > 5
114 #include <sys/kdaemon.h>
Erik Andersen4f3f7572000-04-28 00:18:56 +0000115#else
Eric Andersenb6b519b2001-04-09 23:52:18 +0000116 extern int bdflush (int func, long int data);
117#endif
Erik Andersen4f3f7572000-04-28 00:18:56 +0000118
Eric Andersen0ecb54a1999-12-05 23:24:55 +0000119
Matt Kraai7bd773c2001-06-12 20:55:02 +0000120#define SHELL "/bin/sh" /* Default shell */
121#define LOGIN_SHELL "-" SHELL /* Default login shell */
Erik Andersen42094cd2000-03-20 21:34:52 +0000122#define INITTAB "/etc/inittab" /* inittab file location */
Erik Andersen96e2abd2000-01-07 11:40:44 +0000123#ifndef INIT_SCRIPT
Erik Andersen42094cd2000-03-20 21:34:52 +0000124#define INIT_SCRIPT "/etc/init.d/rcS" /* Default sysinit script. */
Erik Andersen96e2abd2000-01-07 11:40:44 +0000125#endif
Erik Andersen9c88cac1999-12-30 09:25:17 +0000126
Eric Andersen41492d62001-02-23 00:05:56 +0000127#define MAXENV 16 /* Number of env. vars */
128//static const int MAXENV = 16; /* Number of env. vars */
Mark Whitley59ab0252001-01-23 22:30:04 +0000129static const int LOG = 0x1;
130static const int CONSOLE = 0x2;
Erik Andersen7dc16072000-01-04 01:10:25 +0000131
132/* Allowed init action types */
133typedef enum {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000134 SYSINIT = 1,
135 RESPAWN,
136 ASKFIRST,
137 WAIT,
Erik Andersene132f4b2000-02-09 04:16:43 +0000138 ONCE,
Eric Andersenc97ec342001-04-03 18:01:51 +0000139 CTRLALTDEL,
140 SHUTDOWN
Erik Andersen7dc16072000-01-04 01:10:25 +0000141} initActionEnum;
142
Erik Andersen42094cd2000-03-20 21:34:52 +0000143/* A mapping between "inittab" action name strings and action type codes. */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000144typedef struct initActionType {
145 const char *name;
146 initActionEnum action;
Erik Andersen7dc16072000-01-04 01:10:25 +0000147} initActionType;
148
149static const struct initActionType actions[] = {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000150 {"sysinit", SYSINIT},
151 {"respawn", RESPAWN},
152 {"askfirst", ASKFIRST},
153 {"wait", WAIT},
154 {"once", ONCE},
Erik Andersene132f4b2000-02-09 04:16:43 +0000155 {"ctrlaltdel", CTRLALTDEL},
Eric Andersenc97ec342001-04-03 18:01:51 +0000156 {"shutdown", SHUTDOWN},
Pavel Roskin9027bcf2000-07-14 15:44:25 +0000157 {0, 0}
Erik Andersen7dc16072000-01-04 01:10:25 +0000158};
159
Erik Andersen42094cd2000-03-20 21:34:52 +0000160/* Set up a linked list of initActions, to be read from inittab */
Erik Andersen7dc16072000-01-04 01:10:25 +0000161typedef struct initActionTag initAction;
162struct initActionTag {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000163 pid_t pid;
164 char process[256];
165 char console[256];
166 initAction *nextPtr;
167 initActionEnum action;
Erik Andersen7dc16072000-01-04 01:10:25 +0000168};
Eric Andersen3e6ff902001-03-09 21:24:12 +0000169static initAction *initActionList = NULL;
Erik Andersen7dc16072000-01-04 01:10:25 +0000170
171
Matt Kraai439e3df2001-07-23 14:52:08 +0000172static char *secondConsole = VC_2;
173static char *thirdConsole = VC_3;
174static char *fourthConsole = VC_4;
175static char *log = VC_5;
Erik Andersen42094cd2000-03-20 21:34:52 +0000176static int kernelVersion = 0;
177static char termType[32] = "TERM=linux";
178static char console[32] = _PATH_CONSOLE;
179
Erik Andersene132f4b2000-02-09 04:16:43 +0000180static void delete_initAction(initAction * action);
Eric Andersen0460ff21999-10-25 23:32:44 +0000181
Matt Kraai67a46402001-06-03 05:55:52 +0000182static void loop_forever()
183{
184 while (1)
185 sleep (1);
186}
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000187
Erik Andersen42094cd2000-03-20 21:34:52 +0000188/* Print a message to the specified device.
189 * Device may be bitwise-or'd from LOG | CONSOLE */
190static void message(int device, char *fmt, ...)
Erik Andersen93d65132000-04-06 08:06:36 +0000191 __attribute__ ((format (printf, 2, 3)));
192static void message(int device, char *fmt, ...)
Eric Andersen0460ff21999-10-25 23:32:44 +0000193{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000194 va_list arguments;
195 int fd;
Erik Andersen7dc16072000-01-04 01:10:25 +0000196
Eric Andersen4c781471999-11-26 08:12:56 +0000197#ifdef BB_SYSLOGD
198
Erik Andersene49d5ec2000-02-08 19:58:47 +0000199 /* Log the message to syslogd */
200 if (device & LOG) {
201 char msg[1024];
Eric Andersen4c781471999-11-26 08:12:56 +0000202
Erik Andersene49d5ec2000-02-08 19:58:47 +0000203 va_start(arguments, fmt);
204 vsnprintf(msg, sizeof(msg), fmt, arguments);
205 va_end(arguments);
Eric Andersen1644db92001-09-05 20:18:15 +0000206 syslog_msg(LOG_USER, LOG_USER|LOG_INFO, msg);
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);
Erik Andersene132f4b2000-02-09 04:16:43 +0000222 log = NULL;
223 device = CONSOLE;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000224 }
225 }
226 if ((device & LOG) && (log_fd >= 0)) {
227 va_start(arguments, fmt);
228 vdprintf(log_fd, fmt, arguments);
229 va_end(arguments);
230 }
Eric Andersen4c781471999-11-26 08:12:56 +0000231#endif
232
Erik Andersene49d5ec2000-02-08 19:58:47 +0000233 if (device & CONSOLE) {
234 /* Always send console messages to /dev/console so people will see them. */
235 if (
236 (fd =
237 device_open(_PATH_CONSOLE,
238 O_WRONLY | O_NOCTTY | O_NDELAY)) >= 0) {
239 va_start(arguments, fmt);
240 vdprintf(fd, fmt, arguments);
241 va_end(arguments);
242 close(fd);
243 } else {
244 fprintf(stderr, "Bummer, can't print: ");
245 va_start(arguments, fmt);
246 vfprintf(stderr, fmt, arguments);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000247 va_end(arguments);
248 }
Eric Andersen3ae0c781999-11-04 01:13:21 +0000249 }
Eric Andersencc8ed391999-10-05 16:24:54 +0000250}
251
Eric Andersen0460ff21999-10-25 23:32:44 +0000252/* Set terminal settings to reasonable defaults */
Eric Andersen3e6ff902001-03-09 21:24:12 +0000253static void set_term(int fd)
Eric Andersencc8ed391999-10-05 16:24:54 +0000254{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000255 struct termios tty;
Eric Andersencc8ed391999-10-05 16:24:54 +0000256
Erik Andersene49d5ec2000-02-08 19:58:47 +0000257 tcgetattr(fd, &tty);
Eric Andersencc8ed391999-10-05 16:24:54 +0000258
Erik Andersene49d5ec2000-02-08 19:58:47 +0000259 /* set control chars */
Eric Andersen3849f9b2000-07-10 19:56:47 +0000260 tty.c_cc[VINTR] = 3; /* C-c */
261 tty.c_cc[VQUIT] = 28; /* C-\ */
262 tty.c_cc[VERASE] = 127; /* C-? */
263 tty.c_cc[VKILL] = 21; /* C-u */
264 tty.c_cc[VEOF] = 4; /* C-d */
265 tty.c_cc[VSTART] = 17; /* C-q */
266 tty.c_cc[VSTOP] = 19; /* C-s */
267 tty.c_cc[VSUSP] = 26; /* C-z */
Eric Andersen02bc25b2000-07-06 21:29:32 +0000268
Erik Andersene49d5ec2000-02-08 19:58:47 +0000269 /* use line dicipline 0 */
270 tty.c_line = 0;
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000271
Erik Andersene49d5ec2000-02-08 19:58:47 +0000272 /* Make it be sane */
Erik Andersen6c41c442000-03-19 05:13:49 +0000273 tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD;
Eric Andersend8862922001-04-23 15:14:11 +0000274 tty.c_cflag |= CREAD|HUPCL|CLOCAL;
275
Eric Andersen08b10341999-11-19 02:38:58 +0000276
Erik Andersene49d5ec2000-02-08 19:58:47 +0000277 /* input modes */
278 tty.c_iflag = ICRNL | IXON | IXOFF;
Eric Andersen08b10341999-11-19 02:38:58 +0000279
Erik Andersene49d5ec2000-02-08 19:58:47 +0000280 /* output modes */
281 tty.c_oflag = OPOST | ONLCR;
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000282
Erik Andersene49d5ec2000-02-08 19:58:47 +0000283 /* local modes */
284 tty.c_lflag =
285 ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN;
Eric Andersencc8ed391999-10-05 16:24:54 +0000286
Erik Andersene49d5ec2000-02-08 19:58:47 +0000287 tcsetattr(fd, TCSANOW, &tty);
Eric Andersencc8ed391999-10-05 16:24:54 +0000288}
289
Eric Andersenbc5941a2000-12-06 23:17:37 +0000290/* How much memory does this machine have?
291 Units are kBytes to avoid overflow on 4GB machines */
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 Andersenbc5941a2000-12-06 23:17:37 +0000295 unsigned int result, u, s=10;
Eric Andersencc8ed391999-10-05 16:24:54 +0000296
Erik Andersend07ee462000-02-21 21:26:32 +0000297 if (sysinfo(&info) != 0) {
Eric Andersen53cfb7e2001-01-31 17:29:47 +0000298 perror_msg("Error checking free memory");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000299 return -1;
Eric Andersenabc7d591999-10-19 00:27:50 +0000300 }
Eric Andersenbc5941a2000-12-06 23:17:37 +0000301
302 /* Kernels 2.0.x and 2.2.x return info.mem_unit==0 with values in bytes.
303 * Kernels 2.4.0 return info.mem_unit in bytes. */
304 u = info.mem_unit;
305 if (u==0) u=1;
306 while ( (u&1) == 0 && s > 0 ) { u>>=1; s--; }
307 result = (info.totalram>>s) + (info.totalswap>>s);
308 result = result*u;
309 if (result < 0) result = INT_MAX;
310 return result;
Eric Andersencc8ed391999-10-05 16:24:54 +0000311}
312
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000313static void console_init()
Eric Andersen0460ff21999-10-25 23:32:44 +0000314{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000315 int fd;
316 int tried_devcons = 0;
317 int tried_vtprimary = 0;
Erik Andersen029011b2000-03-04 21:19:32 +0000318 struct vt_stat vt;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000319 struct serial_struct sr;
320 char *s;
Eric Andersen0460ff21999-10-25 23:32:44 +0000321
Erik Andersene49d5ec2000-02-08 19:58:47 +0000322 if ((s = getenv("TERM")) != NULL) {
323 snprintf(termType, sizeof(termType) - 1, "TERM=%s", s);
324 }
Erik Andersenac6e71f2000-01-08 22:04:33 +0000325
Erik Andersene49d5ec2000-02-08 19:58:47 +0000326 if ((s = getenv("CONSOLE")) != NULL) {
Matt Kraai18447702001-05-18 21:24:58 +0000327 safe_strncpy(console, s, sizeof(console));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000328 }
Eric Andersenfbb39c81999-11-08 17:00:52 +0000329#if #cpu(sparc)
Erik Andersene49d5ec2000-02-08 19:58:47 +0000330 /* sparc kernel supports console=tty[ab] parameter which is also
331 * passed to init, so catch it here */
332 else if ((s = getenv("console")) != NULL) {
333 /* remap tty[ab] to /dev/ttyS[01] */
334 if (strcmp(s, "ttya") == 0)
Matt Kraai439e3df2001-07-23 14:52:08 +0000335 safe_strncpy(console, SC_0, sizeof(console));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000336 else if (strcmp(s, "ttyb") == 0)
Matt Kraai439e3df2001-07-23 14:52:08 +0000337 safe_strncpy(console, SC_1, sizeof(console));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000338 }
Eric Andersen219d6f51999-11-02 19:43:01 +0000339#endif
Erik Andersene49d5ec2000-02-08 19:58:47 +0000340 else {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000341 /* 2.2 kernels: identify the real console backend and try to use it */
342 if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
343 /* this is a serial console */
Matt Kraai439e3df2001-07-23 14:52:08 +0000344 snprintf(console, sizeof(console) - 1, SC_FORMAT, sr.line);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000345 } else if (ioctl(0, VT_GETSTATE, &vt) == 0) {
346 /* this is linux virtual tty */
Matt Kraai439e3df2001-07-23 14:52:08 +0000347 snprintf(console, sizeof(console) - 1, VC_FORMAT, vt.v_active);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000348 } else {
Matt Kraai18447702001-05-18 21:24:58 +0000349 safe_strncpy(console, _PATH_CONSOLE, sizeof(console));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000350 tried_devcons++;
351 }
Eric Andersen07e52971999-11-07 07:38:08 +0000352 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000353
354 while ((fd = open(console, O_RDONLY | O_NONBLOCK)) < 0) {
355 /* Can't open selected console -- try /dev/console */
356 if (!tried_devcons) {
357 tried_devcons++;
Matt Kraai18447702001-05-18 21:24:58 +0000358 safe_strncpy(console, _PATH_CONSOLE, sizeof(console));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000359 continue;
360 }
361 /* Can't open selected console -- try vt1 */
362 if (!tried_vtprimary) {
363 tried_vtprimary++;
Matt Kraai439e3df2001-07-23 14:52:08 +0000364 safe_strncpy(console, VC_1, sizeof(console));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000365 continue;
366 }
367 break;
368 }
369 if (fd < 0) {
370 /* Perhaps we should panic here? */
Matt Kraai18447702001-05-18 21:24:58 +0000371 safe_strncpy(console, "/dev/null", sizeof(console));
Eric Andersen07e52971999-11-07 07:38:08 +0000372 } else {
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000373 /* check for serial console and disable logging to tty5 & running a
374 * shell to tty2-4 */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000375 if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000376 log = NULL;
377 secondConsole = NULL;
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000378 thirdConsole = NULL;
379 fourthConsole = NULL;
Erik Andersenfa4718e2000-02-21 19:25:12 +0000380 /* Force the TERM setting to vt102 for serial console --
381 * iff TERM is set to linux (the default) */
382 if (strcmp( termType, "TERM=linux" ) == 0)
Matt Kraai18447702001-05-18 21:24:58 +0000383 safe_strncpy(termType, "TERM=vt102", sizeof(termType));
Erik Andersene132f4b2000-02-09 04:16:43 +0000384 message(LOG | CONSOLE,
385 "serial console detected. Disabling virtual terminals.\r\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000386 }
387 close(fd);
Eric Andersen07e52971999-11-07 07:38:08 +0000388 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000389 message(LOG, "console=%s\n", console);
Eric Andersen0460ff21999-10-25 23:32:44 +0000390}
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000391
392static void fixup_argv(int argc, char **argv, char *new_argv0)
393{
394 int len;
395 /* Fix up argv[0] to be certain we claim to be init */
396 len = strlen(argv[0]);
397 memset(argv[0], 0, len);
398 strncpy(argv[0], new_argv0, len);
399
400 /* Wipe argv[1]-argv[N] so they don't clutter the ps listing */
401 len = 1;
402 while (argc > len) {
403 memset(argv[len], 0, strlen(argv[len]));
404 len++;
405 }
406}
407
Eric Andersen0460ff21999-10-25 23:32:44 +0000408
Erik Andersene49d5ec2000-02-08 19:58:47 +0000409static pid_t run(char *command, char *terminal, int get_enter)
Eric Andersen0460ff21999-10-25 23:32:44 +0000410{
Eric Andersen7f197852001-03-16 01:14:04 +0000411 int i, j;
Eric Andersen477aedd2001-02-20 18:01:50 +0000412 int fd;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000413 pid_t pid;
Eric Andersen7f197852001-03-16 01:14:04 +0000414 char *tmpCmd, *s;
415 char *cmd[255], *cmdpath;
Erik Andersene132f4b2000-02-09 04:16:43 +0000416 char buf[255];
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000417 struct stat sb;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000418 static const char press_enter[] =
419
Eric Andersen38624232001-01-25 00:04:16 +0000420#ifdef CUSTOMIZED_BANNER
421#include CUSTOMIZED_BANNER
422#endif
423
Erik Andersene49d5ec2000-02-08 19:58:47 +0000424 "\nPlease press Enter to activate this console. ";
Eric Andersen477aedd2001-02-20 18:01:50 +0000425 char *environment[MAXENV+1] = {
Eric Andersen7f197852001-03-16 01:14:04 +0000426 termType,
Erik Andersene49d5ec2000-02-08 19:58:47 +0000427 "HOME=/",
428 "PATH=/usr/bin:/bin:/usr/sbin:/sbin",
Matt Kraai7bd773c2001-06-12 20:55:02 +0000429 "SHELL=" SHELL,
Eric Andersen7f197852001-03-16 01:14:04 +0000430 "USER=root",
431 NULL
Erik Andersene49d5ec2000-02-08 19:58:47 +0000432 };
Erik Andersenac6e71f2000-01-08 22:04:33 +0000433
Eric Andersen7f197852001-03-16 01:14:04 +0000434 /* inherit environment to the child, merging our values -andy */
435 for (i=0; environ[i]; i++) {
436 for (j=0; environment[j]; j++) {
437 s = strchr(environment[j], '=');
438 if (!strncmp(environ[i], environment[j], s - environment[j]))
439 break;
440 }
441 if (!environment[j]) {
442 environment[j++] = environ[i];
443 environment[j] = NULL;
444 }
Eric Andersen477aedd2001-02-20 18:01:50 +0000445 }
446
Erik Andersene49d5ec2000-02-08 19:58:47 +0000447 if ((pid = fork()) == 0) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000448 /* Clean up */
Eric Andersenfb6a5082000-09-13 16:15:29 +0000449 ioctl(0, TIOCNOTTY, 0);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000450 close(0);
451 close(1);
452 close(2);
453 setsid();
Eric Andersen0460ff21999-10-25 23:32:44 +0000454
Erik Andersene49d5ec2000-02-08 19:58:47 +0000455 /* Reset signal handlers set for parent process */
456 signal(SIGUSR1, SIG_DFL);
457 signal(SIGUSR2, SIG_DFL);
458 signal(SIGINT, SIG_DFL);
459 signal(SIGTERM, SIG_DFL);
460 signal(SIGHUP, SIG_DFL);
Eric Andersen2f6c04f1999-11-01 23:59:44 +0000461
Erik Andersene49d5ec2000-02-08 19:58:47 +0000462 if ((fd = device_open(terminal, O_RDWR)) < 0) {
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000463 if (stat(terminal, &sb) != 0) {
Eric Andersen53f50612001-03-14 09:01:11 +0000464 message(LOG | CONSOLE, "device '%s' does not exist.\n",
465 terminal);
466 exit(1);
467 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000468 message(LOG | CONSOLE, "Bummer, can't open %s\r\n", terminal);
469 exit(1);
470 }
471 dup2(fd, 0);
472 dup2(fd, 1);
473 dup2(fd, 2);
Eric Andersenfb6a5082000-09-13 16:15:29 +0000474 ioctl(0, TIOCSCTTY, 1);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000475 tcsetpgrp(0, getpgrp());
476 set_term(0);
477
Erik Andersene132f4b2000-02-09 04:16:43 +0000478 /* See if any special /bin/sh requiring characters are present */
479 if (strpbrk(command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
480 cmd[0] = SHELL;
481 cmd[1] = "-c";
482 strcpy(buf, "exec ");
483 strncat(buf, command, sizeof(buf) - strlen(buf) - 1);
484 cmd[2] = buf;
485 cmd[3] = NULL;
486 } else {
487 /* Convert command (char*) into cmd (char**, one word per string) */
488 for (tmpCmd = command, i = 0;
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000489 (tmpCmd = strsep(&command, " \t")) != NULL;) {
Erik Andersene132f4b2000-02-09 04:16:43 +0000490 if (*tmpCmd != '\0') {
491 cmd[i] = tmpCmd;
492 tmpCmd++;
493 i++;
494 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000495 }
Erik Andersene132f4b2000-02-09 04:16:43 +0000496 cmd[i] = NULL;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000497 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000498
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000499 cmdpath = cmd[0];
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000500
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000501 /*
502 Interactive shells want to see a dash in argv[0]. This
503 typically is handled by login, argv will be setup this
504 way if a dash appears at the front of the command path
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000505 (like "-/bin/sh").
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000506 */
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000507
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000508 if (*cmdpath == '-') {
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000509
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000510 /* skip over the dash */
511 ++cmdpath;
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000512
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000513 /* find the last component in the command pathname */
514 s = get_last_path_component(cmdpath);
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000515
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000516 /* make a new argv[0] */
517 if ((cmd[0] = malloc(strlen(s)+2)) == NULL) {
518 message(LOG | CONSOLE, "malloc failed");
519 cmd[0] = cmdpath;
520 } else {
521 cmd[0][0] = '-';
522 strcpy(cmd[0]+1, s);
523 }
524 }
525
526 if (get_enter == TRUE) {
527 /*
528 * Save memory by not exec-ing anything large (like a shell)
529 * before the user wants it. This is critical if swap is not
530 * enabled and the system has low memory. Generally this will
531 * be run on the second virtual console, and the first will
532 * be allowed to start a shell or whatever an init script
533 * specifies.
534 */
535#ifdef DEBUG_INIT
536 message(LOG, "Waiting for enter to start '%s' (pid %d, console %s)\r\n",
537 cmd[0], getpid(), terminal);
538#endif
539 write(fileno(stdout), press_enter, sizeof(press_enter) - 1);
540 getc(stdin);
541 }
542
543#ifdef DEBUG_INIT
544 /* Log the process name and args */
545 message(LOG, "Starting pid %d, console %s: '%s'\r\n",
546 getpid(), terminal, command);
547#endif
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000548
Erik Andersen183da4a2000-04-04 18:36:37 +0000549#if defined BB_FEATURE_INIT_COREDUMPS
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000550 if (stat (CORE_ENABLE_FLAG_FILE, &sb) == 0) {
551 struct rlimit limit;
552 limit.rlim_cur = RLIM_INFINITY;
553 limit.rlim_max = RLIM_INFINITY;
554 setrlimit(RLIMIT_CORE, &limit);
Erik Andersen983b51b2000-04-04 18:14:25 +0000555 }
Erik Andersen183da4a2000-04-04 18:36:37 +0000556#endif
Erik Andersen983b51b2000-04-04 18:14:25 +0000557
Erik Andersene49d5ec2000-02-08 19:58:47 +0000558 /* Now run it. The new program will take over this PID,
559 * so nothing further in init.c should be run. */
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000560 execve(cmdpath, cmd, environment);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000561
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000562 /* We're still here? Some error happened. */
563 message(LOG | CONSOLE, "Bummer, could not run '%s': %s\n", cmdpath,
564 strerror(errno));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000565 exit(-1);
Erik Andersen05df2392000-01-13 04:43:48 +0000566 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000567 return pid;
Eric Andersen0460ff21999-10-25 23:32:44 +0000568}
569
Erik Andersene49d5ec2000-02-08 19:58:47 +0000570static int waitfor(char *command, char *terminal, int get_enter)
Erik Andersen0e3782f2000-01-07 02:54:55 +0000571{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000572 int status, wpid;
573 int pid = run(command, terminal, get_enter);
Erik Andersen0e3782f2000-01-07 02:54:55 +0000574
Erik Andersene49d5ec2000-02-08 19:58:47 +0000575 while (1) {
576 wpid = wait(&status);
Erik Andersene132f4b2000-02-09 04:16:43 +0000577 if (wpid > 0 && wpid != pid) {
578 continue;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000579 }
580 if (wpid == pid)
581 break;
Erik Andersen0e3782f2000-01-07 02:54:55 +0000582 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000583 return wpid;
Erik Andersen0e3782f2000-01-07 02:54:55 +0000584}
585
Eric Andersen219d6f51999-11-02 19:43:01 +0000586/* Make sure there is enough memory to do something useful. *
Erik Andersene132f4b2000-02-09 04:16:43 +0000587 * Calls "swapon -a" if needed so be sure /etc/fstab is present... */
Eric Andersen219d6f51999-11-02 19:43:01 +0000588static void check_memory()
589{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000590 struct stat statBuf;
Eric Andersen219d6f51999-11-02 19:43:01 +0000591
Erik Andersend07ee462000-02-21 21:26:32 +0000592 if (check_free_memory() > 1000)
Erik Andersene49d5ec2000-02-08 19:58:47 +0000593 return;
594
595 if (stat("/etc/fstab", &statBuf) == 0) {
Erik Andersen61677fe2000-04-13 01:18:56 +0000596 /* swapon -a requires /proc typically */
597 waitfor("mount proc /proc -t proc", console, FALSE);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000598 /* Try to turn on swap */
Erik Andersen61677fe2000-04-13 01:18:56 +0000599 waitfor("swapon -a", console, FALSE);
Erik Andersend07ee462000-02-21 21:26:32 +0000600 if (check_free_memory() < 1000)
Erik Andersene49d5ec2000-02-08 19:58:47 +0000601 goto goodnight;
602 } else
603 goto goodnight;
Eric Andersen219d6f51999-11-02 19:43:01 +0000604 return;
605
Erik Andersene49d5ec2000-02-08 19:58:47 +0000606 goodnight:
607 message(CONSOLE,
608 "Sorry, your computer does not have enough memory.\r\n");
Matt Kraai67a46402001-06-03 05:55:52 +0000609 loop_forever();
Eric Andersen219d6f51999-11-02 19:43:01 +0000610}
611
Erik Andersene132f4b2000-02-09 04:16:43 +0000612/* Run all commands to be run right before halt/reboot */
Eric Andersenc97ec342001-04-03 18:01:51 +0000613static void run_actions(initActionEnum action)
Erik Andersene132f4b2000-02-09 04:16:43 +0000614{
Eric Andersen0d4e51d2001-03-15 19:18:21 +0000615 initAction *a, *tmp;
Eric Andersena4edd0e2001-03-15 21:04:18 +0000616 for (a = initActionList; a; a = tmp) {
617 tmp = a->nextPtr;
Eric Andersenc97ec342001-04-03 18:01:51 +0000618 if (a->action == action) {
Erik Andersene132f4b2000-02-09 04:16:43 +0000619 waitfor(a->process, a->console, FALSE);
620 delete_initAction(a);
621 }
622 }
623}
624
625
Erik Andersen7dc16072000-01-04 01:10:25 +0000626#ifndef DEBUG_INIT
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000627static void shutdown_system(void)
Eric Andersencc8ed391999-10-05 16:24:54 +0000628{
Erik Andersene132f4b2000-02-09 04:16:43 +0000629
Erik Andersene49d5ec2000-02-08 19:58:47 +0000630 /* first disable our SIGHUP signal */
631 signal(SIGHUP, SIG_DFL);
Erik Andersen7dc16072000-01-04 01:10:25 +0000632
Erik Andersene49d5ec2000-02-08 19:58:47 +0000633 /* Allow Ctrl-Alt-Del to reboot system. */
Erik Andersen4f3f7572000-04-28 00:18:56 +0000634 init_reboot(RB_ENABLE_CAD);
Erik Andersene132f4b2000-02-09 04:16:43 +0000635
636 message(CONSOLE|LOG, "\r\nThe system is going down NOW !!\r\n");
Eric Andersencf8c9cf1999-11-05 00:31:46 +0000637 sync();
Erik Andersene49d5ec2000-02-08 19:58:47 +0000638
639 /* Send signals to every process _except_ pid 1 */
Erik Andersene132f4b2000-02-09 04:16:43 +0000640 message(CONSOLE|LOG, "Sending SIGTERM to all processes.\r\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000641 kill(-1, SIGTERM);
Erik Andersene132f4b2000-02-09 04:16:43 +0000642 sleep(1);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000643 sync();
644
Erik Andersene132f4b2000-02-09 04:16:43 +0000645 message(CONSOLE|LOG, "Sending SIGKILL to all processes.\r\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000646 kill(-1, SIGKILL);
Erik Andersene132f4b2000-02-09 04:16:43 +0000647 sleep(1);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000648
Matt Kraai8fc364e2001-04-12 20:12:16 +0000649 /* run everything to be run at "shutdown" */
Eric Andersenc97ec342001-04-03 18:01:51 +0000650 run_actions(SHUTDOWN);
Erik Andersene132f4b2000-02-09 04:16:43 +0000651
Erik Andersene49d5ec2000-02-08 19:58:47 +0000652 sync();
Eric Andersenbd22ed82000-07-08 18:55:24 +0000653 if (kernelVersion > 0 && kernelVersion <= KERNEL_VERSION(2,2,11)) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000654 /* bdflush, kupdate not needed for kernels >2.2.11 */
655 bdflush(1, 0);
656 sync();
657 }
Eric Andersencc8ed391999-10-05 16:24:54 +0000658}
659
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000660static void halt_signal(int sig)
Eric Andersencc8ed391999-10-05 16:24:54 +0000661{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000662 shutdown_system();
Erik Andersene132f4b2000-02-09 04:16:43 +0000663 message(CONSOLE|LOG,
Erik Andersene49d5ec2000-02-08 19:58:47 +0000664 "The system is halted. Press %s or turn off power\r\n",
665 (secondConsole == NULL) /* serial console */
666 ? "Reset" : "CTRL-ALT-DEL");
667 sync();
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000668
Erik Andersene49d5ec2000-02-08 19:58:47 +0000669 /* allow time for last message to reach serial console */
Erik Andersene132f4b2000-02-09 04:16:43 +0000670 sleep(2);
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000671
Eric Andersenbd22ed82000-07-08 18:55:24 +0000672 if (sig == SIGUSR2 && kernelVersion >= KERNEL_VERSION(2,2,0))
Erik Andersen4f3f7572000-04-28 00:18:56 +0000673 init_reboot(RB_POWER_OFF);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000674 else
Erik Andersen4f3f7572000-04-28 00:18:56 +0000675 init_reboot(RB_HALT_SYSTEM);
Matt Kraai67a46402001-06-03 05:55:52 +0000676
677 loop_forever();
Eric Andersencc8ed391999-10-05 16:24:54 +0000678}
679
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000680static void reboot_signal(int sig)
Eric Andersencc8ed391999-10-05 16:24:54 +0000681{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000682 shutdown_system();
Erik Andersene132f4b2000-02-09 04:16:43 +0000683 message(CONSOLE|LOG, "Please stand by while rebooting the system.\r\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000684 sync();
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000685
Erik Andersene49d5ec2000-02-08 19:58:47 +0000686 /* allow time for last message to reach serial console */
687 sleep(2);
Erik Andersen3fe39dc2000-01-25 18:13:53 +0000688
Erik Andersen4f3f7572000-04-28 00:18:56 +0000689 init_reboot(RB_AUTOBOOT);
Matt Kraai67a46402001-06-03 05:55:52 +0000690
691 loop_forever();
Eric Andersencc8ed391999-10-05 16:24:54 +0000692}
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000693
Eric Andersenc97ec342001-04-03 18:01:51 +0000694static void ctrlaltdel_signal(int sig)
695{
696 run_actions(CTRLALTDEL);
697}
698
Erik Andersene49d5ec2000-02-08 19:58:47 +0000699#endif /* ! DEBUG_INIT */
Erik Andersende552872000-01-23 01:34:05 +0000700
Eric Andersen3e6ff902001-03-09 21:24:12 +0000701static void new_initAction(initActionEnum action, char *process, char *cons)
Erik Andersen7dc16072000-01-04 01:10:25 +0000702{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000703 initAction *newAction;
Eric Andersen1644db92001-09-05 20:18:15 +0000704#ifdef BB_FEATURE_INIT_NORMAL_ORDER
705 initAction *a;
706#endif
Erik Andersen9e737252000-01-06 01:16:13 +0000707
Erik Andersene49d5ec2000-02-08 19:58:47 +0000708 if (*cons == '\0')
709 cons = console;
Erik Andersen9e737252000-01-06 01:16:13 +0000710
Erik Andersene49d5ec2000-02-08 19:58:47 +0000711 /* If BusyBox detects that a serial console is in use,
712 * then entries not refering to the console or null devices will _not_ be run.
713 * The exception to this rule is the null device.
714 */
715 if (secondConsole == NULL && strcmp(cons, console)
716 && strcmp(cons, "/dev/null"))
717 return;
Eric Andersen1644db92001-09-05 20:18:15 +0000718 if (strcmp(cons, "/dev/null") == 0 && action == ASKFIRST)
719 return;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000720
721 newAction = calloc((size_t) (1), sizeof(initAction));
722 if (!newAction) {
723 message(LOG | CONSOLE, "Memory allocation failure\n");
Matt Kraai67a46402001-06-03 05:55:52 +0000724 loop_forever();
Erik Andersene49d5ec2000-02-08 19:58:47 +0000725 }
Eric Andersen1644db92001-09-05 20:18:15 +0000726#ifdef BB_FEATURE_INIT_NORMAL_ORDER
727 for (a = initActionList; a && a->nextPtr; a = a->nextPtr) ;
728 if (a) {
729 a->nextPtr = newAction;
730 } else {
731 initActionList = newAction;
732 }
733#else
Erik Andersene49d5ec2000-02-08 19:58:47 +0000734 newAction->nextPtr = initActionList;
735 initActionList = newAction;
Eric Andersen1644db92001-09-05 20:18:15 +0000736#endif
Erik Andersene49d5ec2000-02-08 19:58:47 +0000737 strncpy(newAction->process, process, 255);
738 newAction->action = action;
739 strncpy(newAction->console, cons, 255);
740 newAction->pid = 0;
Erik Andersen31638212000-01-15 22:28:50 +0000741// message(LOG|CONSOLE, "process='%s' action='%d' console='%s'\n",
Erik Andersene49d5ec2000-02-08 19:58:47 +0000742// newAction->process, newAction->action, newAction->console);
Erik Andersen7dc16072000-01-04 01:10:25 +0000743}
744
Erik Andersene132f4b2000-02-09 04:16:43 +0000745static void delete_initAction(initAction * action)
Erik Andersen7dc16072000-01-04 01:10:25 +0000746{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000747 initAction *a, *b = NULL;
748
749 for (a = initActionList; a; b = a, a = a->nextPtr) {
750 if (a == action) {
751 if (b == NULL) {
752 initActionList = a->nextPtr;
753 } else {
754 b->nextPtr = a->nextPtr;
755 }
756 free(a);
757 break;
758 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000759 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000760}
761
Erik Andersen9e737252000-01-06 01:16:13 +0000762/* NOTE that if BB_FEATURE_USE_INITTAB is NOT defined,
763 * then parse_inittab() simply adds in some default
Eric Andersen77d92682001-05-23 20:32:09 +0000764 * actions(i.e., runs INIT_SCRIPT and then starts a pair
Erik Andersen812d4662000-01-07 18:30:40 +0000765 * of "askfirst" shells). If BB_FEATURE_USE_INITTAB
766 * _is_ defined, but /etc/inittab is missing, this
767 * results in the same set of default behaviors.
Erik Andersen9e737252000-01-06 01:16:13 +0000768 * */
Eric Andersen3e6ff902001-03-09 21:24:12 +0000769static void parse_inittab(void)
Erik Andersen7dc16072000-01-04 01:10:25 +0000770{
Erik Andersen9e737252000-01-06 01:16:13 +0000771#ifdef BB_FEATURE_USE_INITTAB
Erik Andersene49d5ec2000-02-08 19:58:47 +0000772 FILE *file;
773 char buf[256], lineAsRead[256], tmpConsole[256];
Eric Andersenb5966362000-05-31 20:04:38 +0000774 char *id, *runlev, *action, *process, *eol;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000775 const struct initActionType *a = actions;
776 int foundIt;
Erik Andersen7dc16072000-01-04 01:10:25 +0000777
778
Erik Andersene49d5ec2000-02-08 19:58:47 +0000779 file = fopen(INITTAB, "r");
780 if (file == NULL) {
781 /* No inittab file -- set up some default behavior */
Erik Andersen9e737252000-01-06 01:16:13 +0000782#endif
Eric Andersenc97ec342001-04-03 18:01:51 +0000783 /* Reboot on Ctrl-Alt-Del */
784 new_initAction(CTRLALTDEL, "/sbin/reboot", console);
Eric Andersen1644db92001-09-05 20:18:15 +0000785#ifdef BB_FEATURE_INIT_NORMAL_ORDER
786 /* Umount all filesystems on halt/reboot */
787 new_initAction(SHUTDOWN, "/bin/umount -a -r", console);
788 /* Swapoff on halt/reboot */
789 new_initAction(SHUTDOWN, "/sbin/swapoff -a", console);
790#else
Erik Andersene132f4b2000-02-09 04:16:43 +0000791 /* Swapoff on halt/reboot */
Eric Andersenc97ec342001-04-03 18:01:51 +0000792 new_initAction(SHUTDOWN, "/sbin/swapoff -a", console);
Erik Andersene132f4b2000-02-09 04:16:43 +0000793 /* Umount all filesystems on halt/reboot */
Eric Andersenc97ec342001-04-03 18:01:51 +0000794 new_initAction(SHUTDOWN, "/bin/umount -a -r", console);
Eric Andersen1644db92001-09-05 20:18:15 +0000795#endif
Erik Andersene49d5ec2000-02-08 19:58:47 +0000796 /* Askfirst shell on tty1 */
Matt Kraai7bd773c2001-06-12 20:55:02 +0000797 new_initAction(ASKFIRST, LOGIN_SHELL, console);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000798 /* Askfirst shell on tty2 */
799 if (secondConsole != NULL)
Matt Kraai7bd773c2001-06-12 20:55:02 +0000800 new_initAction(ASKFIRST, LOGIN_SHELL, secondConsole);
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000801 /* Askfirst shell on tty3 */
802 if (thirdConsole != NULL)
Matt Kraai7bd773c2001-06-12 20:55:02 +0000803 new_initAction(ASKFIRST, LOGIN_SHELL, thirdConsole);
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000804 /* Askfirst shell on tty4 */
805 if (fourthConsole != NULL)
Matt Kraai7bd773c2001-06-12 20:55:02 +0000806 new_initAction(ASKFIRST, LOGIN_SHELL, fourthConsole);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000807 /* sysinit */
808 new_initAction(SYSINIT, INIT_SCRIPT, console);
Erik Andersen7dc16072000-01-04 01:10:25 +0000809
Erik Andersene49d5ec2000-02-08 19:58:47 +0000810 return;
Erik Andersen9e737252000-01-06 01:16:13 +0000811#ifdef BB_FEATURE_USE_INITTAB
Erik Andersen9e737252000-01-06 01:16:13 +0000812 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000813
Erik Andersene49d5ec2000-02-08 19:58:47 +0000814 while (fgets(buf, 255, file) != NULL) {
815 foundIt = FALSE;
Eric Andersenb5966362000-05-31 20:04:38 +0000816 /* Skip leading spaces */
817 for (id = buf; *id == ' ' || *id == '\t'; id++);
818
819 /* Skip the line if it's a comment */
820 if (*id == '#' || *id == '\n')
Erik Andersene49d5ec2000-02-08 19:58:47 +0000821 continue;
Erik Andersen7dc16072000-01-04 01:10:25 +0000822
Erik Andersene49d5ec2000-02-08 19:58:47 +0000823 /* Trim the trailing \n */
Eric Andersenb5966362000-05-31 20:04:38 +0000824 eol = strrchr(id, '\n');
825 if (eol != NULL)
826 *eol = '\0';
Erik Andersen7dc16072000-01-04 01:10:25 +0000827
Erik Andersene49d5ec2000-02-08 19:58:47 +0000828 /* Keep a copy around for posterity's sake (and error msgs) */
829 strcpy(lineAsRead, buf);
830
Eric Andersenb5966362000-05-31 20:04:38 +0000831 /* Separate the ID field from the runlevels */
832 runlev = strchr(id, ':');
833 if (runlev == NULL || *(runlev + 1) == '\0') {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000834 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
835 continue;
836 } else {
Eric Andersenb5966362000-05-31 20:04:38 +0000837 *runlev = '\0';
838 ++runlev;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000839 }
840
Eric Andersenb5966362000-05-31 20:04:38 +0000841 /* Separate the runlevels from the action */
842 action = strchr(runlev, ':');
843 if (action == NULL || *(action + 1) == '\0') {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000844 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
845 continue;
846 } else {
Eric Andersenb5966362000-05-31 20:04:38 +0000847 *action = '\0';
848 ++action;
849 }
850
851 /* Separate the action from the process */
852 process = strchr(action, ':');
853 if (process == NULL || *(process + 1) == '\0') {
854 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
855 continue;
856 } else {
857 *process = '\0';
858 ++process;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000859 }
860
861 /* Ok, now process it */
862 a = actions;
863 while (a->name != 0) {
Eric Andersenb5966362000-05-31 20:04:38 +0000864 if (strcmp(a->name, action) == 0) {
865 if (*id != '\0') {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000866 strcpy(tmpConsole, "/dev/");
Eric Andersenb5966362000-05-31 20:04:38 +0000867 strncat(tmpConsole, id, 200);
Eric Andersenb5966362000-05-31 20:04:38 +0000868 id = tmpConsole;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000869 }
Eric Andersenb5966362000-05-31 20:04:38 +0000870 new_initAction(a->action, process, id);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000871 foundIt = TRUE;
872 }
873 a++;
874 }
875 if (foundIt == TRUE)
876 continue;
877 else {
878 /* Choke on an unknown action */
879 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
880 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000881 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000882 return;
Erik Andersen42094cd2000-03-20 21:34:52 +0000883#endif /* BB_FEATURE_USE_INITTAB */
Erik Andersen7dc16072000-01-04 01:10:25 +0000884}
885
Erik Andersene132f4b2000-02-09 04:16:43 +0000886
887
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000888extern int init_main(int argc, char **argv)
Eric Andersen0460ff21999-10-25 23:32:44 +0000889{
Eric Andersen0d4e51d2001-03-15 19:18:21 +0000890 initAction *a, *tmp;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000891 pid_t wpid;
892 int status;
Eric Andersen0460ff21999-10-25 23:32:44 +0000893
Eric Andersend73dc5b1999-11-10 23:13:02 +0000894#ifndef DEBUG_INIT
Erik Andersena51ecdd2000-02-24 18:09:58 +0000895 /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
896 if (getpid() != 1
897#ifdef BB_FEATURE_LINUXRC
Matt Kraaie58771e2000-07-12 15:38:49 +0000898 && strstr(applet_name, "linuxrc") == NULL
Erik Andersena51ecdd2000-02-24 18:09:58 +0000899#endif
900 )
901 {
Eric Andersen67991cf2001-02-14 21:23:06 +0000902 show_usage();
Erik Andersene49d5ec2000-02-08 19:58:47 +0000903 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000904 /* Set up sig handlers -- be sure to
905 * clear all of these in run() */
906 signal(SIGUSR1, halt_signal);
Eric Andersen4c95a282000-07-07 19:30:28 +0000907 signal(SIGUSR2, halt_signal);
Eric Andersenc97ec342001-04-03 18:01:51 +0000908 signal(SIGINT, ctrlaltdel_signal);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000909 signal(SIGTERM, reboot_signal);
Eric Andersen0460ff21999-10-25 23:32:44 +0000910
Erik Andersene49d5ec2000-02-08 19:58:47 +0000911 /* Turn off rebooting via CTL-ALT-DEL -- we get a
912 * SIGINT on CAD so we can shut things down gracefully... */
Erik Andersen4f3f7572000-04-28 00:18:56 +0000913 init_reboot(RB_DISABLE_CAD);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000914#endif
Erik Andersen05df2392000-01-13 04:43:48 +0000915
Erik Andersen298854f2000-03-23 01:09:18 +0000916 /* Figure out what kernel this is running */
917 kernelVersion = get_kernel_revision();
918
Erik Andersene49d5ec2000-02-08 19:58:47 +0000919 /* Figure out where the default console should be */
920 console_init();
Eric Andersen0460ff21999-10-25 23:32:44 +0000921
Erik Andersene49d5ec2000-02-08 19:58:47 +0000922 /* Close whatever files are open, and reset the console. */
923 close(0);
924 close(1);
925 close(2);
926 set_term(0);
Erik Andersen983b51b2000-04-04 18:14:25 +0000927 chdir("/");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000928 setsid();
Eric Andersencc8ed391999-10-05 16:24:54 +0000929
Erik Andersene49d5ec2000-02-08 19:58:47 +0000930 /* Make sure PATH is set to something sane */
Eric Andersen452fd332001-03-04 06:47:33 +0000931 putenv("PATH="_PATH_STDPATH);
Eric Andersencc8ed391999-10-05 16:24:54 +0000932
Erik Andersene49d5ec2000-02-08 19:58:47 +0000933 /* Hello world */
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000934#ifndef DEBUG_INIT
Erik Andersenea6b67d2000-03-07 07:47:10 +0000935 message(
936#if ! defined BB_FEATURE_EXTRA_QUIET
937 CONSOLE|
938#endif
939 LOG,
Pavel Roskin9c5fcc32000-07-17 23:45:12 +0000940 "init started: %s\r\n", full_version);
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000941#else
Erik Andersenea6b67d2000-03-07 07:47:10 +0000942 message(
943#if ! defined BB_FEATURE_EXTRA_QUIET
944 CONSOLE|
945#endif
946 LOG,
Pavel Roskin9c5fcc32000-07-17 23:45:12 +0000947 "init(%d) started: %s\r\n", getpid(), full_version);
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000948#endif
Eric Andersencc8ed391999-10-05 16:24:54 +0000949
Eric Andersencc8ed391999-10-05 16:24:54 +0000950
Erik Andersene49d5ec2000-02-08 19:58:47 +0000951 /* Make sure there is enough memory to do something useful. */
952 check_memory();
Erik Andersen9e737252000-01-06 01:16:13 +0000953
Erik Andersene49d5ec2000-02-08 19:58:47 +0000954 /* Check if we are supposed to be in single user mode */
955 if (argc > 1 && (!strcmp(argv[1], "single") ||
956 !strcmp(argv[1], "-s") || !strcmp(argv[1], "1"))) {
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000957 /* Ask first then start a shell on tty2-4 */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000958 if (secondConsole != NULL)
Matt Kraai7bd773c2001-06-12 20:55:02 +0000959 new_initAction(ASKFIRST, LOGIN_SHELL, secondConsole);
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000960 if (thirdConsole != NULL)
Matt Kraai7bd773c2001-06-12 20:55:02 +0000961 new_initAction(ASKFIRST, LOGIN_SHELL, thirdConsole);
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000962 if (fourthConsole != NULL)
Matt Kraai7bd773c2001-06-12 20:55:02 +0000963 new_initAction(ASKFIRST, LOGIN_SHELL, fourthConsole);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000964 /* Start a shell on tty1 */
Matt Kraai7bd773c2001-06-12 20:55:02 +0000965 new_initAction(RESPAWN, LOGIN_SHELL, console);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000966 } else {
967 /* Not in single user mode -- see what inittab says */
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000968
Erik Andersene49d5ec2000-02-08 19:58:47 +0000969 /* NOTE that if BB_FEATURE_USE_INITTAB is NOT defined,
970 * then parse_inittab() simply adds in some default
Eric Andersen77d92682001-05-23 20:32:09 +0000971 * actions(i.e., runs INIT_SCRIPT and then starts a pair
Erik Andersene49d5ec2000-02-08 19:58:47 +0000972 * of "askfirst" shells */
973 parse_inittab();
Eric Andersend00c2621999-12-07 08:37:31 +0000974 }
Erik Andersen983b51b2000-04-04 18:14:25 +0000975
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000976 /* Make the command line just say "init" -- thats all, nothing else */
977 fixup_argv(argc, argv, "init");
Eric Andersen219d6f51999-11-02 19:43:01 +0000978
Erik Andersene49d5ec2000-02-08 19:58:47 +0000979 /* Now run everything that needs to be run */
980
981 /* First run the sysinit command */
Eric Andersen1644db92001-09-05 20:18:15 +0000982 run_actions(SYSINIT);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000983 /* Next run anything that wants to block */
Eric Andersen1644db92001-09-05 20:18:15 +0000984 run_actions(WAIT);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000985 /* Next run anything to be run only once */
Eric Andersena4edd0e2001-03-15 21:04:18 +0000986 for (a = initActionList; a; a = tmp) {
987 tmp = a->nextPtr;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000988 if (a->action == ONCE) {
989 run(a->process, a->console, FALSE);
990 /* Now remove the "once" entry from the list */
991 delete_initAction(a);
992 }
993 }
994 /* If there is nothing else to do, stop */
995 if (initActionList == NULL) {
996 message(LOG | CONSOLE,
997 "No more tasks for init -- sleeping forever.\n");
Matt Kraai67a46402001-06-03 05:55:52 +0000998 loop_forever();
Erik Andersene49d5ec2000-02-08 19:58:47 +0000999 }
1000
1001 /* Now run the looping stuff for the rest of forever */
1002 while (1) {
1003 for (a = initActionList; a; a = a->nextPtr) {
1004 /* Only run stuff with pid==0. If they have
1005 * a pid, that means they are still running */
1006 if (a->pid == 0) {
1007 switch (a->action) {
1008 case RESPAWN:
1009 /* run the respawn stuff */
1010 a->pid = run(a->process, a->console, FALSE);
1011 break;
1012 case ASKFIRST:
1013 /* run the askfirst stuff */
1014 a->pid = run(a->process, a->console, TRUE);
1015 break;
1016 /* silence the compiler's incessant whining */
1017 default:
1018 break;
1019 }
1020 }
1021 }
1022 /* Wait for a child process to exit */
1023 wpid = wait(&status);
1024 if (wpid > 0) {
1025 /* Find out who died and clean up their corpse */
1026 for (a = initActionList; a; a = a->nextPtr) {
1027 if (a->pid == wpid) {
1028 a->pid = 0;
1029 message(LOG,
1030 "Process '%s' (pid %d) exited. Scheduling it for restart.\n",
1031 a->process, wpid);
1032 }
1033 }
1034 }
1035 sleep(1);
1036 }
Eric Andersencc8ed391999-10-05 16:24:54 +00001037}
Erik Andersen029011b2000-03-04 21:19:32 +00001038
1039/*
1040Local Variables:
1041c-file-style: "linux"
1042c-basic-offset: 4
1043tab-width: 4
1044End:
1045*/