blob: 698563228ad54a2a5490078bfa37b8984e749f91 [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 *
Eric Andersenc4996011999-10-20 22:08:37 +00005 * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
Eric Andersenc7bda1c2004-03-15 08:29:22 +00006 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
Eric Andersenc4996011999-10-20 22:08:37 +00007 * Adjusted by so many folks, it's impossible to keep track.
8 *
Rob Landley2edf5262006-01-22 02:41:51 +00009 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
Eric Andersenc4996011999-10-20 22:08:37 +000010 */
11
Bernhard Reutner-Fischercf1f2ac2006-06-02 10:43:17 +000012#include "busybox.h"
Eric Andersenb186d981999-12-03 09:19:54 +000013#include <paths.h>
Erik Andersen42094cd2000-03-20 21:34:52 +000014#include <signal.h>
Erik Andersen42094cd2000-03-20 21:34:52 +000015#include <sys/ioctl.h>
Erik Andersen42094cd2000-03-20 21:34:52 +000016#include <sys/wait.h>
Eric Andersen85e5e722003-07-22 08:56:55 +000017#include <sys/reboot.h>
Eric Andersenb01ed652003-06-27 17:08:15 +000018
Denis Vlasenko9b1381f2007-01-03 02:56:00 +000019#if ENABLE_SYSLOGD
Erik Andersen4f3f7572000-04-28 00:18:56 +000020# include <sys/syslog.h>
21#endif
Eric Andersen2c1de612003-04-24 11:41:28 +000022
Eric Andersen0826b6b2002-07-03 23:50:16 +000023#define INIT_BUFFS_SIZE 256
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +000024#define CONSOLE_NAME_SIZE 32
25#define MAXENV 16 /* Number of env. vars */
Eric Andersenbd22ed82000-07-08 18:55:24 +000026
Eric Andersen41492d62001-02-23 00:05:56 +000027#ifndef _PATH_STDPATH
Erik Andersen4f3f7572000-04-28 00:18:56 +000028#define _PATH_STDPATH "/usr/bin:/bin:/usr/sbin:/sbin"
Eric Andersen41492d62001-02-23 00:05:56 +000029#endif
Eric Andersencc8ed391999-10-05 16:24:54 +000030
Denis Vlasenko9b1381f2007-01-03 02:56:00 +000031#if ENABLE_FEATURE_INIT_COREDUMPS
Erik Andersen983b51b2000-04-04 18:14:25 +000032/*
Eric Andersenc7bda1c2004-03-15 08:29:22 +000033 * When a file named CORE_ENABLE_FLAG_FILE exists, setrlimit is called
Erik Andersen183da4a2000-04-04 18:36:37 +000034 * before processes are spawned to set core file size as unlimited.
35 * This is for debugging only. Don't use this is production, unless
36 * you want core dumps lying about....
Erik Andersen983b51b2000-04-04 18:14:25 +000037 */
38#define CORE_ENABLE_FLAG_FILE "/.init_enable_core"
39#include <sys/resource.h>
Erik Andersen183da4a2000-04-04 18:36:37 +000040#endif
Erik Andersen983b51b2000-04-04 18:14:25 +000041
Glenn L McGrathbaf55a82002-08-22 18:22:10 +000042#define INITTAB "/etc/inittab" /* inittab file location */
Erik Andersen96e2abd2000-01-07 11:40:44 +000043#ifndef INIT_SCRIPT
Glenn L McGrathbaf55a82002-08-22 18:22:10 +000044#define INIT_SCRIPT "/etc/init.d/rcS" /* Default sysinit script. */
Erik Andersen96e2abd2000-01-07 11:40:44 +000045#endif
Erik Andersen9c88cac1999-12-30 09:25:17 +000046
Erik Andersen7dc16072000-01-04 01:10:25 +000047/* Allowed init action types */
Eric Andersen0298be82002-03-05 15:12:19 +000048#define SYSINIT 0x001
49#define RESPAWN 0x002
50#define ASKFIRST 0x004
51#define WAIT 0x008
52#define ONCE 0x010
53#define CTRLALTDEL 0x020
54#define SHUTDOWN 0x040
55#define RESTART 0x080
Erik Andersen7dc16072000-01-04 01:10:25 +000056
Erik Andersen42094cd2000-03-20 21:34:52 +000057/* A mapping between "inittab" action name strings and action type codes. */
Eric Andersen0298be82002-03-05 15:12:19 +000058struct init_action_type {
Erik Andersene49d5ec2000-02-08 19:58:47 +000059 const char *name;
Eric Andersen0298be82002-03-05 15:12:19 +000060 int action;
61};
Erik Andersen7dc16072000-01-04 01:10:25 +000062
Eric Andersen0298be82002-03-05 15:12:19 +000063static const struct init_action_type actions[] = {
Erik Andersene49d5ec2000-02-08 19:58:47 +000064 {"sysinit", SYSINIT},
65 {"respawn", RESPAWN},
66 {"askfirst", ASKFIRST},
67 {"wait", WAIT},
68 {"once", ONCE},
Erik Andersene132f4b2000-02-09 04:16:43 +000069 {"ctrlaltdel", CTRLALTDEL},
Eric Andersenc97ec342001-04-03 18:01:51 +000070 {"shutdown", SHUTDOWN},
Eric Andersen730f8262001-12-17 23:13:08 +000071 {"restart", RESTART},
Pavel Roskin9027bcf2000-07-14 15:44:25 +000072 {0, 0}
Erik Andersen7dc16072000-01-04 01:10:25 +000073};
74
Eric Andersen0298be82002-03-05 15:12:19 +000075/* Set up a linked list of init_actions, to be read from inittab */
76struct init_action {
Eric Andersen0298be82002-03-05 15:12:19 +000077 struct init_action *next;
78 int action;
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +000079 pid_t pid;
80 char command[INIT_BUFFS_SIZE];
81 char terminal[CONSOLE_NAME_SIZE];
Erik Andersen7dc16072000-01-04 01:10:25 +000082};
Erik Andersen7dc16072000-01-04 01:10:25 +000083
Eric Andersen0298be82002-03-05 15:12:19 +000084/* Static variables */
85static struct init_action *init_action_list = NULL;
Glenn L McGrathbaf55a82002-08-22 18:22:10 +000086
Denis Vlasenko9b1381f2007-01-03 02:56:00 +000087#if !ENABLE_SYSLOGD
Denis Vlasenko4c978632007-02-03 03:31:13 +000088static const char *log_console = VC_5;
Eric Andersene7078062002-07-29 08:00:16 +000089#endif
Bernhard Reutner-Fischercf1f2ac2006-06-02 10:43:17 +000090#if !ENABLE_DEBUG_INIT
Eric Andersen0298be82002-03-05 15:12:19 +000091static sig_atomic_t got_cont = 0;
Bernhard Reutner-Fischercf1f2ac2006-06-02 10:43:17 +000092#endif
Rob Landleybc68cd12006-03-10 19:22:06 +000093
94enum {
Denis Vlasenkoec27feb2007-02-17 15:52:02 +000095 L_LOG = 0x1,
96 L_CONSOLE = 0x2,
Glenn L McGrathbaf55a82002-08-22 18:22:10 +000097
Denis Vlasenko9b1381f2007-01-03 02:56:00 +000098#if ENABLE_FEATURE_EXTRA_QUIET
Rob Landleybc68cd12006-03-10 19:22:06 +000099 MAYBE_CONSOLE = 0x0,
Eric Andersen0298be82002-03-05 15:12:19 +0000100#else
Denis Vlasenkoec27feb2007-02-17 15:52:02 +0000101 MAYBE_CONSOLE = L_CONSOLE,
Eric Andersen0298be82002-03-05 15:12:19 +0000102#endif
Glenn L McGrathbaf55a82002-08-22 18:22:10 +0000103
Rob Landleybc68cd12006-03-10 19:22:06 +0000104#ifndef RB_HALT_SYSTEM
Bernhard Reutner-Fischercf1f2ac2006-06-02 10:43:17 +0000105 RB_HALT_SYSTEM = 0xcdef0123, /* FIXME: this overflows enum */
Rob Landleybc68cd12006-03-10 19:22:06 +0000106 RB_ENABLE_CAD = 0x89abcdef,
107 RB_DISABLE_CAD = 0,
108 RB_POWER_OFF = 0x4321fedc,
109 RB_AUTOBOOT = 0x01234567,
Eric Andersen0298be82002-03-05 15:12:19 +0000110#endif
Rob Landleybc68cd12006-03-10 19:22:06 +0000111};
Erik Andersen42094cd2000-03-20 21:34:52 +0000112
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +0000113static const char * const environment[] = {
114 "HOME=/",
115 "PATH=" _PATH_STDPATH,
Glenn L McGrathdc4e75e2003-09-02 02:36:18 +0000116 "SHELL=/bin/sh",
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +0000117 "USER=root",
118 NULL
119};
120
Eric Andersen0298be82002-03-05 15:12:19 +0000121/* Function prototypes */
122static void delete_init_action(struct init_action *a);
Bernhard Reutner-Fischer3ab30802006-05-30 12:10:29 +0000123static int waitfor(const struct init_action *a, pid_t pid);
Bernhard Reutner-Fischercf1f2ac2006-06-02 10:43:17 +0000124#if !ENABLE_DEBUG_INIT
Paul Foxd112f8f2006-06-01 13:17:49 +0000125static void shutdown_signal(int sig);
Bernhard Reutner-Fischercf1f2ac2006-06-02 10:43:17 +0000126#endif
Eric Andersen0460ff21999-10-25 23:32:44 +0000127
Denis Vlasenko9b1381f2007-01-03 02:56:00 +0000128#if !ENABLE_DEBUG_INIT
Eric Andersen74400cc2001-10-18 04:11:39 +0000129static void loop_forever(void)
Matt Kraai67a46402001-06-03 05:55:52 +0000130{
131 while (1)
Glenn L McGrathbaf55a82002-08-22 18:22:10 +0000132 sleep(1);
Matt Kraai67a46402001-06-03 05:55:52 +0000133}
Denis Vlasenko9b1381f2007-01-03 02:56:00 +0000134#endif
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000135
Erik Andersen42094cd2000-03-20 21:34:52 +0000136/* Print a message to the specified device.
Denis Vlasenkoec27feb2007-02-17 15:52:02 +0000137 * Device may be bitwise-or'd from L_LOG | L_CONSOLE */
Bernhard Reutner-Fischer35e1a072006-05-29 13:08:35 +0000138#if ENABLE_DEBUG_INIT
139#define messageD message
140#else
Denis Vlasenkobf0a2012006-12-26 10:42:51 +0000141#define messageD(...) do {} while (0)
Eric Andersenfedce062001-11-17 07:27:14 +0000142#endif
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +0000143static void message(int device, const char *fmt, ...)
Glenn L McGrathbaf55a82002-08-22 18:22:10 +0000144 __attribute__ ((format(printf, 2, 3)));
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +0000145static void message(int device, const char *fmt, ...)
Eric Andersen0460ff21999-10-25 23:32:44 +0000146{
Denis Vlasenko9b1381f2007-01-03 02:56:00 +0000147#if !ENABLE_SYSLOGD
Eric Andersen22237012003-01-23 07:08:26 +0000148 static int log_fd = -1;
149#endif
Eric Andersen4c781471999-11-26 08:12:56 +0000150
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000151 va_list arguments;
152 int l;
153 char msg[128];
154
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +0000155 msg[0] = '\r';
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000156 va_start(arguments, fmt);
157 vsnprintf(msg + 1, sizeof(msg) - 2, fmt, arguments);
Denis Vlasenkoec27feb2007-02-17 15:52:02 +0000158 va_end(arguments);
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000159 msg[sizeof(msg) - 2] = '\0';
160 l = strlen(msg);
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +0000161
Denis Vlasenko9b1381f2007-01-03 02:56:00 +0000162#if ENABLE_SYSLOGD
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +0000163 /* Log the message to syslogd */
Denis Vlasenkoec27feb2007-02-17 15:52:02 +0000164 if (device & L_LOG) {
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000165 /* don't out "\r" */
Denis Vlasenko8f8f2682006-10-03 21:00:43 +0000166 openlog(applet_name, 0, LOG_DAEMON);
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000167 syslog(LOG_INFO, "init: %s", msg + 1);
Eric Andersen36adca82004-06-22 10:07:17 +0000168 closelog();
Eric Andersen3ae0c781999-11-04 01:13:21 +0000169 }
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +0000170 msg[l++] = '\n';
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000171 msg[l] = '\0';
Erik Andersene49d5ec2000-02-08 19:58:47 +0000172#else
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +0000173 msg[l++] = '\n';
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000174 msg[l] = '\0';
Erik Andersene49d5ec2000-02-08 19:58:47 +0000175 /* Take full control of the log tty, and never close it.
176 * It's mine, all mine! Muhahahaha! */
177 if (log_fd < 0) {
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000178 if (!log_console) {
179 log_fd = 2;
Eric Andersen6a979902002-09-30 20:08:53 +0000180 } else {
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000181 log_fd = device_open(log_console, O_WRONLY | O_NONBLOCK | O_NOCTTY);
182 if (log_fd < 0) {
183 bb_error_msg("can't log to %s", log_console);
184 device = L_CONSOLE;
185 } else {
186 fcntl(log_fd, F_SETFD, FD_CLOEXEC);
187 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000188 }
189 }
Denis Vlasenkoec27feb2007-02-17 15:52:02 +0000190 if (device & L_LOG) {
Rob Landley53437472006-07-16 08:14:35 +0000191 full_write(log_fd, msg, l);
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000192 if (log_fd == 2)
193 return; /* don't print dup messages */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000194 }
Eric Andersen4c781471999-11-26 08:12:56 +0000195#endif
196
Denis Vlasenkoec27feb2007-02-17 15:52:02 +0000197 if (device & L_CONSOLE) {
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000198 /* Send console messages to console so people will see them. */
199 full_write(2, msg, l);
Eric Andersen3ae0c781999-11-04 01:13:21 +0000200 }
Eric Andersencc8ed391999-10-05 16:24:54 +0000201}
202
Eric Andersen0460ff21999-10-25 23:32:44 +0000203/* Set terminal settings to reasonable defaults */
Denis Vlasenkod238a472007-03-05 19:22:04 +0000204static void set_sane_term(void)
Eric Andersencc8ed391999-10-05 16:24:54 +0000205{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000206 struct termios tty;
Eric Andersencc8ed391999-10-05 16:24:54 +0000207
Bernhard Reutner-Fischer49e60b92006-05-29 12:57:52 +0000208 tcgetattr(STDIN_FILENO, &tty);
Eric Andersencc8ed391999-10-05 16:24:54 +0000209
Erik Andersene49d5ec2000-02-08 19:58:47 +0000210 /* set control chars */
Glenn L McGrathbaf55a82002-08-22 18:22:10 +0000211 tty.c_cc[VINTR] = 3; /* C-c */
212 tty.c_cc[VQUIT] = 28; /* C-\ */
213 tty.c_cc[VERASE] = 127; /* C-? */
214 tty.c_cc[VKILL] = 21; /* C-u */
215 tty.c_cc[VEOF] = 4; /* C-d */
Eric Andersen3849f9b2000-07-10 19:56:47 +0000216 tty.c_cc[VSTART] = 17; /* C-q */
Glenn L McGrathbaf55a82002-08-22 18:22:10 +0000217 tty.c_cc[VSTOP] = 19; /* C-s */
218 tty.c_cc[VSUSP] = 26; /* C-z */
Eric Andersen02bc25b2000-07-06 21:29:32 +0000219
Erik Andersene49d5ec2000-02-08 19:58:47 +0000220 /* use line dicipline 0 */
221 tty.c_line = 0;
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000222
Erik Andersene49d5ec2000-02-08 19:58:47 +0000223 /* Make it be sane */
Glenn L McGrathbaf55a82002-08-22 18:22:10 +0000224 tty.c_cflag &= CBAUD | CBAUDEX | CSIZE | CSTOPB | PARENB | PARODD;
225 tty.c_cflag |= CREAD | HUPCL | CLOCAL;
Eric Andersend8862922001-04-23 15:14:11 +0000226
Erik Andersene49d5ec2000-02-08 19:58:47 +0000227 /* input modes */
228 tty.c_iflag = ICRNL | IXON | IXOFF;
Eric Andersen08b10341999-11-19 02:38:58 +0000229
Erik Andersene49d5ec2000-02-08 19:58:47 +0000230 /* output modes */
231 tty.c_oflag = OPOST | ONLCR;
Eric Andersen7f1acfd1999-10-29 23:09:13 +0000232
Erik Andersene49d5ec2000-02-08 19:58:47 +0000233 /* local modes */
234 tty.c_lflag =
235 ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN;
Eric Andersencc8ed391999-10-05 16:24:54 +0000236
Bernhard Reutner-Fischer49e60b92006-05-29 12:57:52 +0000237 tcsetattr(STDIN_FILENO, TCSANOW, &tty);
Eric Andersencc8ed391999-10-05 16:24:54 +0000238}
239
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000240/* From <linux/serial.h> */
241struct serial_struct {
242 int type;
243 int line;
244 unsigned int port;
245 int irq;
246 int flags;
247 int xmit_fifo_size;
248 int custom_divisor;
249 int baud_base;
250 unsigned short close_delay;
251 char io_type;
252 char reserved_char[1];
253 int hub6;
254 unsigned short closing_wait; /* time to wait before closing */
255 unsigned short closing_wait2; /* no longer used... */
256 unsigned char *iomem_base;
257 unsigned short iomem_reg_shift;
258 unsigned int port_high;
259 unsigned long iomap_base; /* cookie passed into ioremap */
260 int reserved[1];
261 /* Paranoia (imagine 64bit kernel overwriting 32bit userspace stack) */
262 uint32_t bbox_reserved[16];
263};
Eric Andersen74400cc2001-10-18 04:11:39 +0000264static void console_init(void)
Eric Andersen0460ff21999-10-25 23:32:44 +0000265{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000266 struct serial_struct sr;
267 char *s;
Eric Andersen0460ff21999-10-25 23:32:44 +0000268
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000269 s = getenv("CONSOLE");
270 if (!s) s = getenv("console");
271 if (s) {
272 int fd = open(s, O_RDWR | O_NONBLOCK | O_NOCTTY);
273 if (fd >= 0) {
274 dup2(fd, 0);
275 dup2(fd, 1);
276 dup2(fd, 2);
277 while (fd > 2) close(fd--);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000278 }
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000279 messageD(L_LOG, "console='%s'", s);
Eric Andersen07e52971999-11-07 07:38:08 +0000280 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000281
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000282 s = getenv("TERM");
283 if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
284 /* Force the TERM setting to vt102 for serial console --
285 * if TERM is set to linux (the default) */
286 if (!s || strcmp(s, "linux") == 0)
287 putenv((char*)"TERM=vt102");
Denis Vlasenko9b1381f2007-01-03 02:56:00 +0000288#if !ENABLE_SYSLOGD
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000289 log_console = NULL;
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +0000290#endif
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000291 } else if (!s)
292 putenv((char*)"TERM=linux");
Eric Andersen0460ff21999-10-25 23:32:44 +0000293}
Glenn L McGrathbaf55a82002-08-22 18:22:10 +0000294
Denis Vlasenko06c0a712007-01-29 22:51:44 +0000295static void fixup_argv(int argc, char **argv, const char *new_argv0)
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000296{
297 int len;
Glenn L McGrathbaf55a82002-08-22 18:22:10 +0000298
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000299 /* Fix up argv[0] to be certain we claim to be init */
300 len = strlen(argv[0]);
Denis Vlasenko06c0a712007-01-29 22:51:44 +0000301 strncpy(argv[0], new_argv0, len);
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000302
303 /* Wipe argv[1]-argv[N] so they don't clutter the ps listing */
304 len = 1;
305 while (argc > len) {
306 memset(argv[len], 0, strlen(argv[len]));
307 len++;
308 }
309}
310
Bernhard Reutner-Fischer0da069d2006-05-29 12:54:16 +0000311/* Open the new terminal device */
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000312static void open_stdio_to_tty(const char* tty_name, int fail)
313{
314 /* empty tty_name means "use init's tty", else... */
315 if (tty_name[0]) {
Denis Vlasenkod238a472007-03-05 19:22:04 +0000316 int fd = device_open(tty_name, O_RDWR);
317 if (fd < 0) {
Denis Vlasenko966bb432007-02-27 19:20:33 +0000318 message(L_LOG | L_CONSOLE, "Can't open %s: %s",
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000319 tty_name, strerror(errno));
320 if (fail)
321 _exit(1);
Bernhard Reutner-Fischercf1f2ac2006-06-02 10:43:17 +0000322#if !ENABLE_DEBUG_INIT
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000323 shutdown_signal(SIGUSR1);
Bernhard Reutner-Fischercf1f2ac2006-06-02 10:43:17 +0000324#else
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000325 _exit(2);
Bernhard Reutner-Fischercf1f2ac2006-06-02 10:43:17 +0000326#endif
Denis Vlasenkod238a472007-03-05 19:22:04 +0000327 } else {
328 dup2(fd, 0);
329 dup2(fd, 1);
330 dup2(fd, 2);
331 if (fd > 2) close(fd);
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000332 }
Bernhard Reutner-Fischer0da069d2006-05-29 12:54:16 +0000333 }
Denis Vlasenkod238a472007-03-05 19:22:04 +0000334 set_sane_term();
Bernhard Reutner-Fischer0da069d2006-05-29 12:54:16 +0000335}
336
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +0000337static pid_t run(const struct init_action *a)
Eric Andersen0298be82002-03-05 15:12:19 +0000338{
Bernhard Reutner-Fischer3ab30802006-05-30 12:10:29 +0000339 int i;
Mike Frysinger10427ab2005-07-06 05:00:48 +0000340 pid_t pid;
Denis Vlasenko06c0a712007-01-29 22:51:44 +0000341 char *s, *tmpCmd, *cmdpath;
342 char *cmd[INIT_BUFFS_SIZE];
Glenn L McGrathbaf55a82002-08-22 18:22:10 +0000343 char buf[INIT_BUFFS_SIZE + 6]; /* INIT_BUFFS_SIZE+strlen("exec ")+1 */
Eric Andersen0298be82002-03-05 15:12:19 +0000344 sigset_t nmask, omask;
Erik Andersenac6e71f2000-01-08 22:04:33 +0000345
Eric Andersen0298be82002-03-05 15:12:19 +0000346 /* Block sigchild while forking. */
347 sigemptyset(&nmask);
348 sigaddset(&nmask, SIGCHLD);
349 sigprocmask(SIG_BLOCK, &nmask, &omask);
Denis Vlasenko966bb432007-02-27 19:20:33 +0000350 pid = fork();
351 sigprocmask(SIG_SETMASK, &omask, NULL);
Eric Andersen0298be82002-03-05 15:12:19 +0000352
Denis Vlasenko966bb432007-02-27 19:20:33 +0000353 if (pid)
354 return pid;
Eric Andersen0298be82002-03-05 15:12:19 +0000355
Denis Vlasenko966bb432007-02-27 19:20:33 +0000356 /* Reset signal handlers that were set by the parent process */
357 signal(SIGUSR1, SIG_DFL);
358 signal(SIGUSR2, SIG_DFL);
359 signal(SIGINT, SIG_DFL);
360 signal(SIGTERM, SIG_DFL);
361 signal(SIGHUP, SIG_DFL);
362 signal(SIGQUIT, SIG_DFL);
363 signal(SIGCONT, SIG_DFL);
364 signal(SIGSTOP, SIG_DFL);
365 signal(SIGTSTP, SIG_DFL);
Eric Andersen2f6c04f1999-11-01 23:59:44 +0000366
Denis Vlasenko966bb432007-02-27 19:20:33 +0000367 /* Create a new session and make ourself the process
368 * group leader */
369 setsid();
Eric Andersen599e3ce2002-07-03 11:08:10 +0000370
Denis Vlasenko966bb432007-02-27 19:20:33 +0000371 /* Open the new terminal device */
372 open_stdio_to_tty(a->terminal, 1);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000373
Denis Vlasenko966bb432007-02-27 19:20:33 +0000374 /* If the init Action requires us to wait, then force the
375 * supplied terminal to be the controlling tty. */
376 if (a->action & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) {
Eric Andersen0298be82002-03-05 15:12:19 +0000377
Denis Vlasenko966bb432007-02-27 19:20:33 +0000378 /* Now fork off another process to just hang around */
379 if ((pid = fork()) < 0) {
380 message(L_LOG | L_CONSOLE, "Can't fork");
381 _exit(1);
382 }
383
384 if (pid > 0) {
385
386 /* We are the parent -- wait till the child is done */
387 signal(SIGINT, SIG_IGN);
388 signal(SIGTSTP, SIG_IGN);
389 signal(SIGQUIT, SIG_IGN);
390 signal(SIGCHLD, SIG_DFL);
391
392 waitfor(NULL, pid);
393 /* See if stealing the controlling tty back is necessary */
394 if (tcgetpgrp(0) != getpid())
395 _exit(0);
396
397 /* Use a temporary process to steal the controlling tty. */
Eric Andersen0298be82002-03-05 15:12:19 +0000398 if ((pid = fork()) < 0) {
Denis Vlasenko966bb432007-02-27 19:20:33 +0000399 message(L_LOG | L_CONSOLE, "Can't fork");
Eric Andersen0298be82002-03-05 15:12:19 +0000400 _exit(1);
401 }
Denis Vlasenko966bb432007-02-27 19:20:33 +0000402 if (pid == 0) {
403 setsid();
404 ioctl(0, TIOCSCTTY, 1);
Eric Andersen0298be82002-03-05 15:12:19 +0000405 _exit(0);
406 }
Denis Vlasenko966bb432007-02-27 19:20:33 +0000407 waitfor(NULL, pid);
408 _exit(0);
Eric Andersen0298be82002-03-05 15:12:19 +0000409 }
410
Denis Vlasenko966bb432007-02-27 19:20:33 +0000411 /* Now fall though to actually execute things */
412 }
413
414 /* See if any special /bin/sh requiring characters are present */
415 if (strpbrk(a->command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
416 cmd[0] = (char*)DEFAULT_SHELL;
417 cmd[1] = (char*)"-c";
418 cmd[2] = strcat(strcpy(buf, "exec "), a->command);
419 cmd[3] = NULL;
420 } else {
421 /* Convert command (char*) into cmd (char**, one word per string) */
422 strcpy(buf, a->command);
423 s = buf;
424 for (tmpCmd = buf, i = 0; (tmpCmd = strsep(&s, " \t")) != NULL;) {
425 if (*tmpCmd != '\0') {
426 cmd[i] = tmpCmd;
427 i++;
428 }
429 }
430 cmd[i] = NULL;
431 }
432
433 cmdpath = cmd[0];
434
435 /*
436 * Interactive shells want to see a dash in argv[0]. This
437 * typically is handled by login, argv will be setup this
438 * way if a dash appears at the front of the command path
439 * (like "-/bin/sh").
440 */
441 if (*cmdpath == '-') {
442 /* skip over the dash */
443 ++cmdpath;
444
445 /* find the last component in the command pathname */
446 s = bb_get_last_path_component(cmdpath);
447
448 /* make a new argv[0] */
449 if ((cmd[0] = malloc(strlen(s) + 2)) == NULL) {
450 message(L_LOG | L_CONSOLE, bb_msg_memory_exhausted);
451 cmd[0] = cmdpath;
Erik Andersene132f4b2000-02-09 04:16:43 +0000452 } else {
Denis Vlasenko966bb432007-02-27 19:20:33 +0000453 cmd[0][0] = '-';
454 strcpy(cmd[0] + 1, s);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000455 }
Denis Vlasenko9b1381f2007-01-03 02:56:00 +0000456#if ENABLE_FEATURE_INIT_SCTTY
Denis Vlasenko966bb432007-02-27 19:20:33 +0000457 /* Establish this process as session leader and
458 * (attempt) to make the tty (if any) a controlling tty.
459 */
460 setsid();
461 ioctl(0, TIOCSCTTY, 0 /*don't steal it*/);
Paul Fox41a72ec2005-08-01 16:43:13 +0000462#endif
Denis Vlasenko966bb432007-02-27 19:20:33 +0000463 }
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000464
Eric Andersen1f50e842004-08-16 09:29:42 +0000465#if !defined(__UCLIBC__) || defined(__ARCH_HAS_MMU__)
Denis Vlasenko966bb432007-02-27 19:20:33 +0000466 if (a->action & ASKFIRST) {
467 static const char press_enter[] =
468#ifdef CUSTOMIZED_BANNER
469#include CUSTOMIZED_BANNER
Eric Andersen1f50e842004-08-16 09:29:42 +0000470#endif
Denis Vlasenko966bb432007-02-27 19:20:33 +0000471 "\nPlease press Enter to activate this console. ";
472 char c;
473 /*
474 * Save memory by not exec-ing anything large (like a shell)
475 * before the user wants it. This is critical if swap is not
476 * enabled and the system has low memory. Generally this will
477 * be run on the second virtual console, and the first will
478 * be allowed to start a shell or whatever an init script
479 * specifies.
480 */
481 messageD(L_LOG, "waiting for enter to start '%s'"
482 "(pid %d, tty '%s')\n",
483 cmdpath, getpid(), a->terminal);
484 full_write(1, press_enter, sizeof(press_enter) - 1);
485 while (read(0, &c, 1) == 1 && c != '\n')
486 ;
487 }
488#endif
489 /* Log the process name and args */
490 message(L_LOG, "starting pid %d, tty '%s': '%s'",
491 getpid(), a->terminal, cmdpath);
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000492
Denis Vlasenko9b1381f2007-01-03 02:56:00 +0000493#if ENABLE_FEATURE_INIT_COREDUMPS
Denis Vlasenko966bb432007-02-27 19:20:33 +0000494 {
495 struct stat sb;
496 if (stat(CORE_ENABLE_FLAG_FILE, &sb) == 0) {
497 struct rlimit limit;
Glenn L McGrathbaf55a82002-08-22 18:22:10 +0000498
Denis Vlasenko966bb432007-02-27 19:20:33 +0000499 limit.rlim_cur = RLIM_INFINITY;
500 limit.rlim_max = RLIM_INFINITY;
501 setrlimit(RLIMIT_CORE, &limit);
Erik Andersen983b51b2000-04-04 18:14:25 +0000502 }
Erik Andersen05df2392000-01-13 04:43:48 +0000503 }
Denis Vlasenko966bb432007-02-27 19:20:33 +0000504#endif
505 /* Now run it. The new program will take over this PID,
506 * so nothing further in init.c should be run. */
507 BB_EXECVP(cmdpath, cmd);
508
509 /* We're still here? Some error happened. */
510 message(L_LOG | L_CONSOLE, "Cannot run '%s': %s",
511 cmdpath, strerror(errno));
512 _exit(-1);
Eric Andersen0460ff21999-10-25 23:32:44 +0000513}
514
Bernhard Reutner-Fischer3ab30802006-05-30 12:10:29 +0000515static int waitfor(const struct init_action *a, pid_t pid)
Erik Andersen0e3782f2000-01-07 02:54:55 +0000516{
Bernhard Reutner-Fischer3ab30802006-05-30 12:10:29 +0000517 int runpid;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000518 int status, wpid;
Erik Andersen0e3782f2000-01-07 02:54:55 +0000519
Bernhard Reutner-Fischer3ab30802006-05-30 12:10:29 +0000520 runpid = (NULL == a)? pid : run(a);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000521 while (1) {
Bernhard Reutner-Fischerd818dcc2007-02-16 17:17:07 +0000522 wpid = waitpid(runpid, &status, 0);
Bernhard Reutner-Fischer3ab30802006-05-30 12:10:29 +0000523 if (wpid == runpid)
Erik Andersene49d5ec2000-02-08 19:58:47 +0000524 break;
Glenn L McGrathe6ba16f2003-09-26 10:45:55 +0000525 if (wpid == -1 && errno == ECHILD) {
526 /* we missed its termination */
527 break;
528 }
529 /* FIXME other errors should maybe trigger an error, but allow
530 * the program to continue */
Erik Andersen0e3782f2000-01-07 02:54:55 +0000531 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000532 return wpid;
Erik Andersen0e3782f2000-01-07 02:54:55 +0000533}
534
Eric Andersen0298be82002-03-05 15:12:19 +0000535/* Run all commands of a particular type */
536static void run_actions(int action)
Eric Andersen219d6f51999-11-02 19:43:01 +0000537{
Eric Andersen0298be82002-03-05 15:12:19 +0000538 struct init_action *a, *tmp;
Eric Andersen219d6f51999-11-02 19:43:01 +0000539
Eric Andersen0298be82002-03-05 15:12:19 +0000540 for (a = init_action_list; a; a = tmp) {
541 tmp = a->next;
Eric Andersenc97ec342001-04-03 18:01:51 +0000542 if (a->action == action) {
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000543 /* a->terminal of "" means "init's console" */
544 if (a->terminal[0] && access(a->terminal, R_OK | W_OK)) {
Rob Landley2dd42792006-03-22 17:39:13 +0000545 delete_init_action(a);
546 } else if (a->action & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) {
Bernhard Reutner-Fischer3ab30802006-05-30 12:10:29 +0000547 waitfor(a, 0);
Eric Andersen0298be82002-03-05 15:12:19 +0000548 delete_init_action(a);
549 } else if (a->action & ONCE) {
550 run(a);
551 delete_init_action(a);
Glenn L McGrathbaf55a82002-08-22 18:22:10 +0000552 } else if (a->action & (RESPAWN | ASKFIRST)) {
Eric Andersen0298be82002-03-05 15:12:19 +0000553 /* Only run stuff with pid==0. If they have
554 * a pid, that means it is still running */
555 if (a->pid == 0) {
556 a->pid = run(a);
557 }
558 }
Erik Andersene132f4b2000-02-09 04:16:43 +0000559 }
560 }
561}
562
Bernhard Reutner-Fischer35e1a072006-05-29 13:08:35 +0000563#if !ENABLE_DEBUG_INIT
Eric Andersen2c1de612003-04-24 11:41:28 +0000564static void init_reboot(unsigned long magic)
565{
566 pid_t pid;
567 /* We have to fork here, since the kernel calls do_exit(0) in
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000568 * linux/kernel/sys.c, which can cause the machine to panic when
Eric Andersen2c1de612003-04-24 11:41:28 +0000569 * the init process is killed.... */
Denis Vlasenko9b1381f2007-01-03 02:56:00 +0000570 pid = vfork();
571 if (pid == 0) { /* child */
Eric Andersen2c1de612003-04-24 11:41:28 +0000572 reboot(magic);
Eric Andersen2c1de612003-04-24 11:41:28 +0000573 _exit(0);
574 }
Denis Vlasenko9b1381f2007-01-03 02:56:00 +0000575 waitpid(pid, NULL, 0);
Eric Andersen2c1de612003-04-24 11:41:28 +0000576}
577
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000578static void shutdown_system(void)
Eric Andersencc8ed391999-10-05 16:24:54 +0000579{
Eric Andersen813d88c2001-10-28 22:49:48 +0000580 sigset_t block_signals;
Erik Andersene132f4b2000-02-09 04:16:43 +0000581
Eric Andersena9cc8962002-09-16 06:49:06 +0000582 /* run everything to be run at "shutdown". This is done _prior_
583 * to killing everything, in case people wish to use scripts to
584 * shut things down gracefully... */
585 run_actions(SHUTDOWN);
586
Eric Andersen72f9a422001-10-28 05:12:20 +0000587 /* first disable all our signals */
588 sigemptyset(&block_signals);
589 sigaddset(&block_signals, SIGHUP);
Mike Frysingera77b4f32005-04-16 08:21:34 +0000590 sigaddset(&block_signals, SIGQUIT);
Eric Andersen72f9a422001-10-28 05:12:20 +0000591 sigaddset(&block_signals, SIGCHLD);
592 sigaddset(&block_signals, SIGUSR1);
593 sigaddset(&block_signals, SIGUSR2);
594 sigaddset(&block_signals, SIGINT);
595 sigaddset(&block_signals, SIGTERM);
Eric Andersened8a9be2001-11-30 19:10:58 +0000596 sigaddset(&block_signals, SIGCONT);
597 sigaddset(&block_signals, SIGSTOP);
598 sigaddset(&block_signals, SIGTSTP);
Eric Andersen72f9a422001-10-28 05:12:20 +0000599 sigprocmask(SIG_BLOCK, &block_signals, NULL);
Erik Andersen7dc16072000-01-04 01:10:25 +0000600
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000601 message(L_CONSOLE | L_LOG, "The system is going down NOW!");
602
Erik Andersene49d5ec2000-02-08 19:58:47 +0000603 /* Allow Ctrl-Alt-Del to reboot system. */
Erik Andersen4f3f7572000-04-28 00:18:56 +0000604 init_reboot(RB_ENABLE_CAD);
Erik Andersene132f4b2000-02-09 04:16:43 +0000605
Erik Andersene49d5ec2000-02-08 19:58:47 +0000606 /* Send signals to every process _except_ pid 1 */
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000607 message(L_CONSOLE | L_LOG, "Sending SIG%s to all processes", "TERM");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000608 kill(-1, SIGTERM);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000609 sync();
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000610 sleep(1);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000611
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000612 message(L_CONSOLE | L_LOG, "Sending SIG%s to all processes", "KILL");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000613 kill(-1, SIGKILL);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000614 sync();
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000615 sleep(1);
Eric Andersencc8ed391999-10-05 16:24:54 +0000616}
617
"Vladimir N. Oleynik"1f04c9d2006-02-01 14:47:52 +0000618static void exec_signal(int sig ATTRIBUTE_UNUSED)
Eric Andersen730f8262001-12-17 23:13:08 +0000619{
Eric Andersen0298be82002-03-05 15:12:19 +0000620 struct init_action *a, *tmp;
Eric Andersen5222d312002-07-03 05:15:23 +0000621 sigset_t unblock_signals;
Glenn L McGrathbaf55a82002-08-22 18:22:10 +0000622
Eric Andersen0298be82002-03-05 15:12:19 +0000623 for (a = init_action_list; a; a = tmp) {
624 tmp = a->next;
625 if (a->action & RESTART) {
Eric Andersen730f8262001-12-17 23:13:08 +0000626 shutdown_system();
Eric Andersen5222d312002-07-03 05:15:23 +0000627
628 /* unblock all signals, blocked in shutdown_system() */
629 sigemptyset(&unblock_signals);
630 sigaddset(&unblock_signals, SIGHUP);
Mike Frysingera77b4f32005-04-16 08:21:34 +0000631 sigaddset(&unblock_signals, SIGQUIT);
Eric Andersen5222d312002-07-03 05:15:23 +0000632 sigaddset(&unblock_signals, SIGCHLD);
633 sigaddset(&unblock_signals, SIGUSR1);
634 sigaddset(&unblock_signals, SIGUSR2);
635 sigaddset(&unblock_signals, SIGINT);
636 sigaddset(&unblock_signals, SIGTERM);
637 sigaddset(&unblock_signals, SIGCONT);
638 sigaddset(&unblock_signals, SIGSTOP);
639 sigaddset(&unblock_signals, SIGTSTP);
640 sigprocmask(SIG_UNBLOCK, &unblock_signals, NULL);
641
Eric Andersen3c8064f2003-07-05 08:29:01 +0000642 /* Open the new terminal device */
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000643 open_stdio_to_tty(a->terminal, 0);
Eric Andersen3c8064f2003-07-05 08:29:01 +0000644
Denis Vlasenkoec27feb2007-02-17 15:52:02 +0000645 messageD(L_CONSOLE | L_LOG, "Trying to re-exec %s", a->command);
Denis Vlasenko4921b542007-02-03 02:17:41 +0000646 BB_EXECLP(a->command, a->command, NULL);
Glenn L McGrathbaf55a82002-08-22 18:22:10 +0000647
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000648 message(L_CONSOLE | L_LOG, "Cannot run '%s': %s",
649 a->command, strerror(errno));
Eric Andersen730f8262001-12-17 23:13:08 +0000650 sleep(2);
651 init_reboot(RB_HALT_SYSTEM);
652 loop_forever();
653 }
654 }
655}
656
Paul Foxd112f8f2006-06-01 13:17:49 +0000657static void shutdown_signal(int sig)
Eric Andersencc8ed391999-10-05 16:24:54 +0000658{
Denis Vlasenkoe968fcd2007-02-03 02:42:47 +0000659 const char *m;
Paul Foxd112f8f2006-06-01 13:17:49 +0000660 int rb;
661
Erik Andersene49d5ec2000-02-08 19:58:47 +0000662 shutdown_system();
Paul Foxd112f8f2006-06-01 13:17:49 +0000663
Denis Vlasenkoe968fcd2007-02-03 02:42:47 +0000664 m = "halt";
665 rb = RB_HALT_SYSTEM;
Paul Foxd112f8f2006-06-01 13:17:49 +0000666 if (sig == SIGTERM) {
667 m = "reboot";
668 rb = RB_AUTOBOOT;
669 } else if (sig == SIGUSR2) {
670 m = "poweroff";
671 rb = RB_POWER_OFF;
Paul Foxd112f8f2006-06-01 13:17:49 +0000672 }
Denis Vlasenkoec27feb2007-02-17 15:52:02 +0000673 message(L_CONSOLE | L_LOG, "Requesting system %s", m);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000674 /* allow time for last message to reach serial console */
Erik Andersene132f4b2000-02-09 04:16:43 +0000675 sleep(2);
Paul Foxd112f8f2006-06-01 13:17:49 +0000676 init_reboot(rb);
Matt Kraai67a46402001-06-03 05:55:52 +0000677 loop_forever();
Eric Andersencc8ed391999-10-05 16:24:54 +0000678}
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000679
"Vladimir N. Oleynik"1f04c9d2006-02-01 14:47:52 +0000680static void ctrlaltdel_signal(int sig ATTRIBUTE_UNUSED)
Eric Andersenc97ec342001-04-03 18:01:51 +0000681{
682 run_actions(CTRLALTDEL);
683}
684
Eric Andersen0298be82002-03-05 15:12:19 +0000685/* The SIGSTOP & SIGTSTP handler */
"Vladimir N. Oleynik"1f04c9d2006-02-01 14:47:52 +0000686static void stop_handler(int sig ATTRIBUTE_UNUSED)
Eric Andersened8a9be2001-11-30 19:10:58 +0000687{
Eric Andersen0298be82002-03-05 15:12:19 +0000688 int saved_errno = errno;
Eric Andersened8a9be2001-11-30 19:10:58 +0000689
690 got_cont = 0;
Glenn L McGrathbaf55a82002-08-22 18:22:10 +0000691 while (!got_cont)
692 pause();
Eric Andersened8a9be2001-11-30 19:10:58 +0000693 got_cont = 0;
694 errno = saved_errno;
695}
696
Glenn L McGrathbaf55a82002-08-22 18:22:10 +0000697/* The SIGCONT handler */
"Vladimir N. Oleynik"1f04c9d2006-02-01 14:47:52 +0000698static void cont_handler(int sig ATTRIBUTE_UNUSED)
Eric Andersened8a9be2001-11-30 19:10:58 +0000699{
700 got_cont = 1;
701}
702
Denis Vlasenkoe968fcd2007-02-03 02:42:47 +0000703#endif /* !ENABLE_DEBUG_INIT */
Erik Andersende552872000-01-23 01:34:05 +0000704
Glenn L McGrathdc4e75e2003-09-02 02:36:18 +0000705static void new_init_action(int action, const char *command, const char *cons)
Erik Andersen7dc16072000-01-04 01:10:25 +0000706{
Eric Andersen22718092004-10-08 08:17:39 +0000707 struct init_action *new_action, *a, *last;
Erik Andersen9e737252000-01-06 01:16:13 +0000708
"Vladimir N. Oleynik"6c35c7c2005-10-12 15:34:25 +0000709 if (strcmp(cons, bb_dev_null) == 0 && (action & ASKFIRST))
Eric Andersen1644db92001-09-05 20:18:15 +0000710 return;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000711
Eric Andersen0298be82002-03-05 15:12:19 +0000712 /* Append to the end of the list */
Eric Andersen22718092004-10-08 08:17:39 +0000713 for (a = last = init_action_list; a; a = a->next) {
Eric Andersen82baf632004-10-08 08:21:54 +0000714 /* don't enter action if it's already in the list,
715 * but do overwrite existing actions */
Denis Vlasenkoec27feb2007-02-17 15:52:02 +0000716 if ((strcmp(a->command, command) == 0)
717 && (strcmp(a->terminal, cons) == 0)
718 ) {
Eric Andersen82baf632004-10-08 08:21:54 +0000719 a->action = action;
Eric Andersen6fd0e312003-07-22 09:48:56 +0000720 return;
721 }
Eric Andersen22718092004-10-08 08:17:39 +0000722 last = a;
Eric Andersen6fd0e312003-07-22 09:48:56 +0000723 }
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000724
725 new_action = xzalloc(sizeof(struct init_action));
Eric Andersen22718092004-10-08 08:17:39 +0000726 if (last) {
727 last->next = new_action;
Eric Andersen1644db92001-09-05 20:18:15 +0000728 } else {
Eric Andersen0298be82002-03-05 15:12:19 +0000729 init_action_list = new_action;
Eric Andersen1644db92001-09-05 20:18:15 +0000730 }
Eric Andersen0826b6b2002-07-03 23:50:16 +0000731 strcpy(new_action->command, command);
Eric Andersen0298be82002-03-05 15:12:19 +0000732 new_action->action = action;
Eric Andersen0826b6b2002-07-03 23:50:16 +0000733 strcpy(new_action->terminal, cons);
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000734 messageD(L_LOG | L_CONSOLE, "command='%s' action=%d tty='%s'\n",
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +0000735 new_action->command, new_action->action, new_action->terminal);
Erik Andersen7dc16072000-01-04 01:10:25 +0000736}
737
Glenn L McGrathbaf55a82002-08-22 18:22:10 +0000738static void delete_init_action(struct init_action *action)
Erik Andersen7dc16072000-01-04 01:10:25 +0000739{
Eric Andersen0298be82002-03-05 15:12:19 +0000740 struct init_action *a, *b = NULL;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000741
Eric Andersen0298be82002-03-05 15:12:19 +0000742 for (a = init_action_list; a; b = a, a = a->next) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000743 if (a == action) {
744 if (b == NULL) {
Eric Andersen0298be82002-03-05 15:12:19 +0000745 init_action_list = a->next;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000746 } else {
Eric Andersen0298be82002-03-05 15:12:19 +0000747 b->next = a->next;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000748 }
749 free(a);
750 break;
751 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000752 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000753}
754
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000755/* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined,
Erik Andersen9e737252000-01-06 01:16:13 +0000756 * then parse_inittab() simply adds in some default
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000757 * actions(i.e., runs INIT_SCRIPT and then starts a pair
758 * of "askfirst" shells). If CONFIG_FEATURE_USE_INITTAB
759 * _is_ defined, but /etc/inittab is missing, this
Erik Andersen812d4662000-01-07 18:30:40 +0000760 * results in the same set of default behaviors.
Glenn L McGrathbaf55a82002-08-22 18:22:10 +0000761 */
Eric Andersen3e6ff902001-03-09 21:24:12 +0000762static void parse_inittab(void)
Erik Andersen7dc16072000-01-04 01:10:25 +0000763{
Denis Vlasenko9b1381f2007-01-03 02:56:00 +0000764#if ENABLE_FEATURE_USE_INITTAB
Erik Andersene49d5ec2000-02-08 19:58:47 +0000765 FILE *file;
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +0000766 char buf[INIT_BUFFS_SIZE], lineAsRead[INIT_BUFFS_SIZE];
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000767 char tmpConsole[CONSOLE_NAME_SIZE];
Eric Andersen0298be82002-03-05 15:12:19 +0000768 char *id, *runlev, *action, *command, *eol;
769 const struct init_action_type *a = actions;
Erik Andersen7dc16072000-01-04 01:10:25 +0000770
Erik Andersene49d5ec2000-02-08 19:58:47 +0000771 file = fopen(INITTAB, "r");
772 if (file == NULL) {
773 /* No inittab file -- set up some default behavior */
Erik Andersen9e737252000-01-06 01:16:13 +0000774#endif
Eric Andersenc97ec342001-04-03 18:01:51 +0000775 /* Reboot on Ctrl-Alt-Del */
Denis Vlasenko2f0c0d02007-01-21 00:41:04 +0000776 new_init_action(CTRLALTDEL, "reboot", "");
Eric Andersen1644db92001-09-05 20:18:15 +0000777 /* Umount all filesystems on halt/reboot */
Denis Vlasenko2f0c0d02007-01-21 00:41:04 +0000778 new_init_action(SHUTDOWN, "umount -a -r", "");
Eric Andersen1644db92001-09-05 20:18:15 +0000779 /* Swapoff on halt/reboot */
Bernhard Reutner-Fischerd818dcc2007-02-16 17:17:07 +0000780 if (ENABLE_SWAPONOFF) new_init_action(SHUTDOWN, "swapoff -a", "");
Eric Andersen730f8262001-12-17 23:13:08 +0000781 /* Prepare to restart init when a HUP is received */
Denis Vlasenko2f0c0d02007-01-21 00:41:04 +0000782 new_init_action(RESTART, "init", "");
Eric Andersen3bc2b202002-07-29 06:39:58 +0000783 /* Askfirst shell on tty1-4 */
Glenn L McGrathdc4e75e2003-09-02 02:36:18 +0000784 new_init_action(ASKFIRST, bb_default_login_shell, "");
785 new_init_action(ASKFIRST, bb_default_login_shell, VC_2);
786 new_init_action(ASKFIRST, bb_default_login_shell, VC_3);
787 new_init_action(ASKFIRST, bb_default_login_shell, VC_4);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000788 /* sysinit */
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +0000789 new_init_action(SYSINIT, INIT_SCRIPT, "");
Erik Andersen7dc16072000-01-04 01:10:25 +0000790
Erik Andersene49d5ec2000-02-08 19:58:47 +0000791 return;
Denis Vlasenko9b1381f2007-01-03 02:56:00 +0000792#if ENABLE_FEATURE_USE_INITTAB
Erik Andersen9e737252000-01-06 01:16:13 +0000793 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000794
Eric Andersen0826b6b2002-07-03 23:50:16 +0000795 while (fgets(buf, INIT_BUFFS_SIZE, file) != NULL) {
Eric Andersenb5966362000-05-31 20:04:38 +0000796 /* Skip leading spaces */
797 for (id = buf; *id == ' ' || *id == '\t'; id++);
798
799 /* Skip the line if it's a comment */
800 if (*id == '#' || *id == '\n')
Erik Andersene49d5ec2000-02-08 19:58:47 +0000801 continue;
Erik Andersen7dc16072000-01-04 01:10:25 +0000802
Erik Andersene49d5ec2000-02-08 19:58:47 +0000803 /* Trim the trailing \n */
Bernhard Reutner-Fischerd818dcc2007-02-16 17:17:07 +0000804 //XXX: chomp() ?
Eric Andersenb5966362000-05-31 20:04:38 +0000805 eol = strrchr(id, '\n');
806 if (eol != NULL)
807 *eol = '\0';
Erik Andersen7dc16072000-01-04 01:10:25 +0000808
Erik Andersene49d5ec2000-02-08 19:58:47 +0000809 /* Keep a copy around for posterity's sake (and error msgs) */
810 strcpy(lineAsRead, buf);
811
Eric Andersenb5966362000-05-31 20:04:38 +0000812 /* Separate the ID field from the runlevels */
813 runlev = strchr(id, ':');
814 if (runlev == NULL || *(runlev + 1) == '\0') {
Denis Vlasenkoec27feb2007-02-17 15:52:02 +0000815 message(L_LOG | L_CONSOLE, "Bad inittab entry: %s", lineAsRead);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000816 continue;
817 } else {
Eric Andersenb5966362000-05-31 20:04:38 +0000818 *runlev = '\0';
819 ++runlev;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000820 }
821
Eric Andersenb5966362000-05-31 20:04:38 +0000822 /* Separate the runlevels from the action */
823 action = strchr(runlev, ':');
824 if (action == NULL || *(action + 1) == '\0') {
Denis Vlasenkoec27feb2007-02-17 15:52:02 +0000825 message(L_LOG | L_CONSOLE, "Bad inittab entry: %s", lineAsRead);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000826 continue;
827 } else {
Eric Andersenb5966362000-05-31 20:04:38 +0000828 *action = '\0';
829 ++action;
830 }
831
Eric Andersen0298be82002-03-05 15:12:19 +0000832 /* Separate the action from the command */
833 command = strchr(action, ':');
834 if (command == NULL || *(command + 1) == '\0') {
Denis Vlasenkoec27feb2007-02-17 15:52:02 +0000835 message(L_LOG | L_CONSOLE, "Bad inittab entry: %s", lineAsRead);
Eric Andersenb5966362000-05-31 20:04:38 +0000836 continue;
837 } else {
Eric Andersen0298be82002-03-05 15:12:19 +0000838 *command = '\0';
839 ++command;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000840 }
841
842 /* Ok, now process it */
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +0000843 for (a = actions; a->name != 0; a++) {
Eric Andersenb5966362000-05-31 20:04:38 +0000844 if (strcmp(a->name, action) == 0) {
845 if (*id != '\0') {
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +0000846 if(strncmp(id, "/dev/", 5) == 0)
847 id += 5;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000848 strcpy(tmpConsole, "/dev/");
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +0000849 safe_strncpy(tmpConsole + 5, id,
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000850 sizeof(tmpConsole) - 5);
Eric Andersenb5966362000-05-31 20:04:38 +0000851 id = tmpConsole;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000852 }
Eric Andersen0298be82002-03-05 15:12:19 +0000853 new_init_action(a->action, command, id);
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +0000854 break;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000855 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000856 }
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +0000857 if (a->name == 0) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000858 /* Choke on an unknown action */
Denis Vlasenkoec27feb2007-02-17 15:52:02 +0000859 message(L_LOG | L_CONSOLE, "Bad inittab entry: %s", lineAsRead);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000860 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000861 }
Eric Andersend8636ca2002-05-15 22:19:09 +0000862 fclose(file);
Denis Vlasenko9b1381f2007-01-03 02:56:00 +0000863#endif /* FEATURE_USE_INITTAB */
Erik Andersen7dc16072000-01-04 01:10:25 +0000864}
865
Denis Vlasenko9b1381f2007-01-03 02:56:00 +0000866#if ENABLE_FEATURE_USE_INITTAB
"Vladimir N. Oleynik"1f04c9d2006-02-01 14:47:52 +0000867static void reload_signal(int sig ATTRIBUTE_UNUSED)
Eric Andersen6fd0e312003-07-22 09:48:56 +0000868{
Eric Andersen82baf632004-10-08 08:21:54 +0000869 struct init_action *a, *tmp;
870
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000871 message(L_LOG, "reloading /etc/inittab");
Eric Andersen82baf632004-10-08 08:21:54 +0000872
873 /* disable old entrys */
874 for (a = init_action_list; a; a = a->next ) {
875 a->action = ONCE;
876 }
877
878 parse_inittab();
879
880 /* remove unused entrys */
881 for (a = init_action_list; a; a = tmp) {
882 tmp = a->next;
883 if (a->action & (ONCE | SYSINIT | WAIT ) &&
884 a->pid == 0 ) {
885 delete_init_action(a);
886 }
887 }
Eric Andersen6fd0e312003-07-22 09:48:56 +0000888 run_actions(RESPAWN);
Eric Andersen6fd0e312003-07-22 09:48:56 +0000889}
Denis Vlasenko9b1381f2007-01-03 02:56:00 +0000890#endif /* FEATURE_USE_INITTAB */
Eric Andersen82baf632004-10-08 08:21:54 +0000891
Denis Vlasenko06af2162007-02-03 17:28:39 +0000892int init_main(int argc, char **argv);
Rob Landleydfba7412006-03-06 20:47:33 +0000893int init_main(int argc, char **argv)
Eric Andersen0460ff21999-10-25 23:32:44 +0000894{
Eric Andersen0298be82002-03-05 15:12:19 +0000895 struct init_action *a;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000896 pid_t wpid;
Eric Andersen0460ff21999-10-25 23:32:44 +0000897
Denis Vlasenko9b1381f2007-01-03 02:56:00 +0000898 die_sleep = 30 * 24*60*60; /* if xmalloc will ever die... */
899
Eric Andersen730f8262001-12-17 23:13:08 +0000900 if (argc > 1 && !strcmp(argv[1], "-q")) {
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000901 return kill(1, SIGHUP);
Eric Andersen730f8262001-12-17 23:13:08 +0000902 }
Bernhard Reutner-Fischer35e1a072006-05-29 13:08:35 +0000903#if !ENABLE_DEBUG_INIT
Erik Andersena51ecdd2000-02-24 18:09:58 +0000904 /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000905 if (getpid() != 1
906 && (!ENABLE_FEATURE_INITRD || !strstr(applet_name, "linuxrc"))
907 ) {
Manuel Novoa III cad53642003-03-19 09:13:01 +0000908 bb_show_usage();
Erik Andersene49d5ec2000-02-08 19:58:47 +0000909 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000910 /* Set up sig handlers -- be sure to
911 * clear all of these in run() */
Glenn L McGrathbaf55a82002-08-22 18:22:10 +0000912 signal(SIGHUP, exec_signal);
Mike Frysingera77b4f32005-04-16 08:21:34 +0000913 signal(SIGQUIT, exec_signal);
Paul Foxd112f8f2006-06-01 13:17:49 +0000914 signal(SIGUSR1, shutdown_signal);
915 signal(SIGUSR2, shutdown_signal);
Glenn L McGrathbaf55a82002-08-22 18:22:10 +0000916 signal(SIGINT, ctrlaltdel_signal);
Paul Foxd112f8f2006-06-01 13:17:49 +0000917 signal(SIGTERM, shutdown_signal);
Eric Andersened8a9be2001-11-30 19:10:58 +0000918 signal(SIGCONT, cont_handler);
919 signal(SIGSTOP, stop_handler);
920 signal(SIGTSTP, stop_handler);
Eric Andersen0460ff21999-10-25 23:32:44 +0000921
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000922 /* Turn off rebooting via CTL-ALT-DEL -- we get a
Erik Andersene49d5ec2000-02-08 19:58:47 +0000923 * SIGINT on CAD so we can shut things down gracefully... */
Erik Andersen4f3f7572000-04-28 00:18:56 +0000924 init_reboot(RB_DISABLE_CAD);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000925#endif
Erik Andersen05df2392000-01-13 04:43:48 +0000926
Eric Andersen599e3ce2002-07-03 11:08:10 +0000927 /* Figure out where the default console should be */
928 console_init();
Denis Vlasenkod238a472007-03-05 19:22:04 +0000929 set_sane_term();
Erik Andersen983b51b2000-04-04 18:14:25 +0000930 chdir("/");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000931 setsid();
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +0000932 {
933 const char * const *e;
934 /* Make sure environs is set to something sane */
Denis Vlasenkobf0a2012006-12-26 10:42:51 +0000935 for (e = environment; *e; e++)
Manuel Novoa III cad53642003-03-19 09:13:01 +0000936 putenv((char *) *e);
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +0000937 }
Rob Landleycba1b962006-07-09 17:28:17 +0000938
939 if (argc > 1) setenv("RUNLEVEL", argv[1], 1);
940
Erik Andersene49d5ec2000-02-08 19:58:47 +0000941 /* Hello world */
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000942 message(MAYBE_CONSOLE | L_LOG, "init started: %s", bb_msg_full_version);
Eric Andersencc8ed391999-10-05 16:24:54 +0000943
Erik Andersene49d5ec2000-02-08 19:58:47 +0000944 /* Make sure there is enough memory to do something useful. */
Rob Landleyc3386a42005-08-30 18:50:37 +0000945 if (ENABLE_SWAPONOFF) {
946 struct sysinfo info;
947
948 if (!sysinfo(&info) &&
Denis Vlasenkodca0b702006-10-27 09:05:02 +0000949 (info.mem_unit ? : 1) * (long long)info.totalram < 1024*1024)
Rob Landleyc3386a42005-08-30 18:50:37 +0000950 {
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000951 message(L_CONSOLE, "Low memory, forcing swapon");
Rob Landleyc3386a42005-08-30 18:50:37 +0000952 /* swapon -a requires /proc typically */
Denis Vlasenko2f0c0d02007-01-21 00:41:04 +0000953 new_init_action(SYSINIT, "mount -t proc proc /proc", "");
Rob Landleyc3386a42005-08-30 18:50:37 +0000954 /* Try to turn on swap */
Denis Vlasenko2f0c0d02007-01-21 00:41:04 +0000955 new_init_action(SYSINIT, "swapon -a", "");
Rob Landleyc3386a42005-08-30 18:50:37 +0000956 run_actions(SYSINIT); /* wait and removing */
957 }
958 }
Erik Andersen9e737252000-01-06 01:16:13 +0000959
Erik Andersene49d5ec2000-02-08 19:58:47 +0000960 /* Check if we are supposed to be in single user mode */
Denis Vlasenkobf66fbc2006-12-21 13:23:14 +0000961 if (argc > 1
962 && (!strcmp(argv[1], "single") || !strcmp(argv[1], "-s") || LONE_CHAR(argv[1], '1'))
963 ) {
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +0000964 /* Start a shell on console */
Glenn L McGrathdc4e75e2003-09-02 02:36:18 +0000965 new_init_action(RESPAWN, bb_default_login_shell, "");
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
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000969 /* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined,
Erik Andersene49d5ec2000-02-08 19:58:47 +0000970 * then parse_inittab() simply adds in some default
Eric Andersenc7bda1c2004-03-15 08:29:22 +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
Denis Vlasenko9b1381f2007-01-03 02:56:00 +0000976#if ENABLE_SELINUX
Rob Landleyb3ede5a2006-03-27 23:09:12 +0000977 if (getenv("SELINUX_INIT") == NULL) {
978 int enforce = 0;
979
980 putenv("SELINUX_INIT=YES");
981 if (selinux_init_load_policy(&enforce) == 0) {
Denis Vlasenko4921b542007-02-03 02:17:41 +0000982 BB_EXECVP(argv[0], argv);
Rob Landleyb3ede5a2006-03-27 23:09:12 +0000983 } else if (enforce > 0) {
984 /* SELinux in enforcing mode but load_policy failed */
985 /* At this point, we probably can't open /dev/console, so log() won't work */
Denis Vlasenkob7167542007-02-27 19:20:00 +0000986 message(L_CONSOLE, "Cannot load SELinux Policy. "
987 "Machine is in enforcing mode. Halting now.");
Rob Landleyb3ede5a2006-03-27 23:09:12 +0000988 exit(1);
989 }
990 }
991#endif /* CONFIG_SELINUX */
992
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000993 /* Make the command line just say "init" -- thats all, nothing else */
994 fixup_argv(argc, argv, "init");
Eric Andersen219d6f51999-11-02 19:43:01 +0000995
Erik Andersene49d5ec2000-02-08 19:58:47 +0000996 /* Now run everything that needs to be run */
997
998 /* First run the sysinit command */
Eric Andersen1644db92001-09-05 20:18:15 +0000999 run_actions(SYSINIT);
Eric Andersen0298be82002-03-05 15:12:19 +00001000
Erik Andersene49d5ec2000-02-08 19:58:47 +00001001 /* Next run anything that wants to block */
Eric Andersen1644db92001-09-05 20:18:15 +00001002 run_actions(WAIT);
Eric Andersen0298be82002-03-05 15:12:19 +00001003
Erik Andersene49d5ec2000-02-08 19:58:47 +00001004 /* Next run anything to be run only once */
Eric Andersen0298be82002-03-05 15:12:19 +00001005 run_actions(ONCE);
1006
Denis Vlasenko9b1381f2007-01-03 02:56:00 +00001007#if ENABLE_FEATURE_USE_INITTAB
Eric Andersen6fd0e312003-07-22 09:48:56 +00001008 /* Redefine SIGHUP to reread /etc/inittab */
1009 signal(SIGHUP, reload_signal);
Eric Andersen82baf632004-10-08 08:21:54 +00001010#else
1011 signal(SIGHUP, SIG_IGN);
Denis Vlasenko9b1381f2007-01-03 02:56:00 +00001012#endif /* FEATURE_USE_INITTAB */
Eric Andersen82baf632004-10-08 08:21:54 +00001013
Erik Andersene49d5ec2000-02-08 19:58:47 +00001014 /* Now run the looping stuff for the rest of forever */
1015 while (1) {
Eric Andersen0298be82002-03-05 15:12:19 +00001016 /* run the respawn stuff */
1017 run_actions(RESPAWN);
1018
1019 /* run the askfirst stuff */
1020 run_actions(ASKFIRST);
1021
1022 /* Don't consume all CPU time -- sleep a bit */
1023 sleep(1);
1024
Erik Andersene49d5ec2000-02-08 19:58:47 +00001025 /* Wait for a child process to exit */
Bernhard Reutner-Fischerc58dbf22006-05-30 12:16:54 +00001026 wpid = wait(NULL);
Eric Andersen87812dc2004-04-12 19:21:54 +00001027 while (wpid > 0) {
Erik Andersene49d5ec2000-02-08 19:58:47 +00001028 /* Find out who died and clean up their corpse */
Eric Andersen0298be82002-03-05 15:12:19 +00001029 for (a = init_action_list; a; a = a->next) {
Erik Andersene49d5ec2000-02-08 19:58:47 +00001030 if (a->pid == wpid) {
Eric Andersen0298be82002-03-05 15:12:19 +00001031 /* Set the pid to 0 so that the process gets
1032 * restarted by run_actions() */
Erik Andersene49d5ec2000-02-08 19:58:47 +00001033 a->pid = 0;
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +00001034 message(L_LOG, "process '%s' (pid %d) exited. "
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +00001035 "Scheduling it for restart.",
1036 a->command, wpid);
Erik Andersene49d5ec2000-02-08 19:58:47 +00001037 }
1038 }
Eric Andersencf1fee02002-12-17 09:48:16 +00001039 /* see if anyone else is waiting to be reaped */
Denis Vlasenkoce979602006-09-27 23:31:08 +00001040 wpid = waitpid(-1, NULL, WNOHANG);
Erik Andersene49d5ec2000-02-08 19:58:47 +00001041 }
Erik Andersene49d5ec2000-02-08 19:58:47 +00001042 }
Eric Andersencc8ed391999-10-05 16:24:54 +00001043}