blob: 9e24817b7538941d7e93b8ab1086b9a86812ce36 [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
Denis Vlasenkob6adbf12007-05-26 19:00:18 +000012#include "libbb.h"
Bernhard Reutner-Fischerf4701962008-01-27 12:50:12 +000013#include <syslog.h>
Eric Andersenb186d981999-12-03 09:19:54 +000014#include <paths.h>
Eric Andersen85e5e722003-07-22 08:56:55 +000015#include <sys/reboot.h>
Eric Andersen2c1de612003-04-24 11:41:28 +000016
Eric Andersen0826b6b2002-07-03 23:50:16 +000017#define INIT_BUFFS_SIZE 256
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +000018#define CONSOLE_NAME_SIZE 32
19#define MAXENV 16 /* Number of env. vars */
Eric Andersenbd22ed82000-07-08 18:55:24 +000020
Erik Andersen983b51b2000-04-04 18:14:25 +000021/*
Eric Andersenc7bda1c2004-03-15 08:29:22 +000022 * When a file named CORE_ENABLE_FLAG_FILE exists, setrlimit is called
Erik Andersen183da4a2000-04-04 18:36:37 +000023 * before processes are spawned to set core file size as unlimited.
24 * This is for debugging only. Don't use this is production, unless
25 * you want core dumps lying about....
Erik Andersen983b51b2000-04-04 18:14:25 +000026 */
27#define CORE_ENABLE_FLAG_FILE "/.init_enable_core"
28#include <sys/resource.h>
Erik Andersen983b51b2000-04-04 18:14:25 +000029
Glenn L McGrathbaf55a82002-08-22 18:22:10 +000030#define INITTAB "/etc/inittab" /* inittab file location */
Erik Andersen96e2abd2000-01-07 11:40:44 +000031#ifndef INIT_SCRIPT
Glenn L McGrathbaf55a82002-08-22 18:22:10 +000032#define INIT_SCRIPT "/etc/init.d/rcS" /* Default sysinit script. */
Erik Andersen96e2abd2000-01-07 11:40:44 +000033#endif
Erik Andersen9c88cac1999-12-30 09:25:17 +000034
Erik Andersen7dc16072000-01-04 01:10:25 +000035/* Allowed init action types */
Eric Andersen0298be82002-03-05 15:12:19 +000036#define SYSINIT 0x001
37#define RESPAWN 0x002
38#define ASKFIRST 0x004
39#define WAIT 0x008
40#define ONCE 0x010
41#define CTRLALTDEL 0x020
42#define SHUTDOWN 0x040
43#define RESTART 0x080
Erik Andersen7dc16072000-01-04 01:10:25 +000044
Denis Vlasenko2afabe82007-12-10 07:06:04 +000045#define STR_SYSINIT "\x01"
46#define STR_RESPAWN "\x02"
47#define STR_ASKFIRST "\x04"
48#define STR_WAIT "\x08"
49#define STR_ONCE "\x10"
50#define STR_CTRLALTDEL "\x20"
51#define STR_SHUTDOWN "\x40"
52#define STR_RESTART "\x80"
Erik Andersen7dc16072000-01-04 01:10:25 +000053
Eric Andersen0298be82002-03-05 15:12:19 +000054/* Set up a linked list of init_actions, to be read from inittab */
55struct init_action {
Eric Andersen0298be82002-03-05 15:12:19 +000056 struct init_action *next;
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +000057 pid_t pid;
Denis Vlasenko2afabe82007-12-10 07:06:04 +000058 uint8_t action;
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +000059 char terminal[CONSOLE_NAME_SIZE];
Denis Vlasenko2afabe82007-12-10 07:06:04 +000060 char command[INIT_BUFFS_SIZE];
Erik Andersen7dc16072000-01-04 01:10:25 +000061};
Erik Andersen7dc16072000-01-04 01:10:25 +000062
Eric Andersen0298be82002-03-05 15:12:19 +000063/* Static variables */
64static struct init_action *init_action_list = NULL;
Glenn L McGrathbaf55a82002-08-22 18:22:10 +000065
Denis Vlasenko4c978632007-02-03 03:31:13 +000066static const char *log_console = VC_5;
Eric Andersen0298be82002-03-05 15:12:19 +000067static sig_atomic_t got_cont = 0;
Rob Landleybc68cd12006-03-10 19:22:06 +000068
69enum {
Denis Vlasenkoec27feb2007-02-17 15:52:02 +000070 L_LOG = 0x1,
71 L_CONSOLE = 0x2,
Glenn L McGrathbaf55a82002-08-22 18:22:10 +000072
Denis Vlasenko9b1381f2007-01-03 02:56:00 +000073#if ENABLE_FEATURE_EXTRA_QUIET
Rob Landleybc68cd12006-03-10 19:22:06 +000074 MAYBE_CONSOLE = 0x0,
Eric Andersen0298be82002-03-05 15:12:19 +000075#else
Denis Vlasenkoec27feb2007-02-17 15:52:02 +000076 MAYBE_CONSOLE = L_CONSOLE,
Eric Andersen0298be82002-03-05 15:12:19 +000077#endif
Glenn L McGrathbaf55a82002-08-22 18:22:10 +000078
Rob Landleybc68cd12006-03-10 19:22:06 +000079#ifndef RB_HALT_SYSTEM
Bernhard Reutner-Fischercf1f2ac2006-06-02 10:43:17 +000080 RB_HALT_SYSTEM = 0xcdef0123, /* FIXME: this overflows enum */
Rob Landleybc68cd12006-03-10 19:22:06 +000081 RB_ENABLE_CAD = 0x89abcdef,
82 RB_DISABLE_CAD = 0,
83 RB_POWER_OFF = 0x4321fedc,
84 RB_AUTOBOOT = 0x01234567,
Eric Andersen0298be82002-03-05 15:12:19 +000085#endif
Rob Landleybc68cd12006-03-10 19:22:06 +000086};
Erik Andersen42094cd2000-03-20 21:34:52 +000087
Denis Vlasenko6ca409e2007-08-12 20:58:27 +000088static const char *const environment[] = {
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +000089 "HOME=/",
Denis Vlasenkof5f75c52007-06-12 22:35:19 +000090 bb_PATH_root_path,
Glenn L McGrathdc4e75e2003-09-02 02:36:18 +000091 "SHELL=/bin/sh",
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +000092 "USER=root",
93 NULL
94};
95
Eric Andersen0298be82002-03-05 15:12:19 +000096/* Function prototypes */
97static void delete_init_action(struct init_action *a);
Denis Vlasenkod55268d2007-12-26 18:32:58 +000098static void halt_reboot_pwoff(int sig) ATTRIBUTE_NORETURN;
Eric Andersen0460ff21999-10-25 23:32:44 +000099
Denis Vlasenko21e20cb2008-01-04 15:10:47 +0000100static void waitfor(pid_t pid)
Denis Vlasenkofb0eba72008-01-02 19:55:04 +0000101{
Denis Vlasenko21e20cb2008-01-04 15:10:47 +0000102 /* waitfor(run(x)): protect against failed fork inside run() */
103 if (pid <= 0)
104 return;
105
106 /* Wait for any child (prevent zombies from exiting orphaned processes)
107 * but exit the loop only when specified one has exited. */
108 while (wait(NULL) != pid)
109 continue;
Denis Vlasenkofb0eba72008-01-02 19:55:04 +0000110}
111
Denis Vlasenkod55268d2007-12-26 18:32:58 +0000112static void loop_forever(void) ATTRIBUTE_NORETURN;
Eric Andersen74400cc2001-10-18 04:11:39 +0000113static void loop_forever(void)
Matt Kraai67a46402001-06-03 05:55:52 +0000114{
115 while (1)
Glenn L McGrathbaf55a82002-08-22 18:22:10 +0000116 sleep(1);
Matt Kraai67a46402001-06-03 05:55:52 +0000117}
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000118
Erik Andersen42094cd2000-03-20 21:34:52 +0000119/* Print a message to the specified device.
Denis Vlasenkoec27feb2007-02-17 15:52:02 +0000120 * Device may be bitwise-or'd from L_LOG | L_CONSOLE */
Mike Frysingerbb50fdf2007-12-25 04:30:14 +0000121#define messageD(...) do { if (ENABLE_DEBUG_INIT) message(__VA_ARGS__); } while (0)
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +0000122static void message(int device, const char *fmt, ...)
Glenn L McGrathbaf55a82002-08-22 18:22:10 +0000123 __attribute__ ((format(printf, 2, 3)));
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +0000124static void message(int device, const char *fmt, ...)
Eric Andersen0460ff21999-10-25 23:32:44 +0000125{
Eric Andersen22237012003-01-23 07:08:26 +0000126 static int log_fd = -1;
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000127 va_list arguments;
128 int l;
129 char msg[128];
130
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +0000131 msg[0] = '\r';
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000132 va_start(arguments, fmt);
133 vsnprintf(msg + 1, sizeof(msg) - 2, fmt, arguments);
Denis Vlasenkoec27feb2007-02-17 15:52:02 +0000134 va_end(arguments);
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000135 msg[sizeof(msg) - 2] = '\0';
136 l = strlen(msg);
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +0000137
Mike Frysingerbb50fdf2007-12-25 04:30:14 +0000138 if (ENABLE_FEATURE_INIT_SYSLOG) {
139 /* Log the message to syslogd */
140 if (device & L_LOG) {
141 /* don't out "\r" */
142 openlog(applet_name, 0, LOG_DAEMON);
143 syslog(LOG_INFO, "init: %s", msg + 1);
144 closelog();
145 }
146 msg[l++] = '\n';
147 msg[l] = '\0';
148 } else {
149 msg[l++] = '\n';
150 msg[l] = '\0';
151 /* Take full control of the log tty, and never close it.
152 * It's mine, all mine! Muhahahaha! */
153 if (log_fd < 0) {
154 if (!log_console) {
155 log_fd = 2;
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000156 } else {
Mike Frysingerbb50fdf2007-12-25 04:30:14 +0000157 log_fd = device_open(log_console, O_WRONLY | O_NONBLOCK | O_NOCTTY);
158 if (log_fd < 0) {
159 bb_error_msg("can't log to %s", log_console);
160 device = L_CONSOLE;
161 } else {
162 close_on_exec_on(log_fd);
163 }
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000164 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000165 }
Mike Frysingerbb50fdf2007-12-25 04:30:14 +0000166 if (device & L_LOG) {
167 full_write(log_fd, msg, l);
168 if (log_fd == 2)
169 return; /* don't print dup messages */
170 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000171 }
Eric Andersen4c781471999-11-26 08:12:56 +0000172
Denis Vlasenkoec27feb2007-02-17 15:52:02 +0000173 if (device & L_CONSOLE) {
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000174 /* Send console messages to console so people will see them. */
175 full_write(2, msg, l);
Eric Andersen3ae0c781999-11-04 01:13:21 +0000176 }
Eric Andersencc8ed391999-10-05 16:24:54 +0000177}
178
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000179/* From <linux/serial.h> */
180struct serial_struct {
181 int type;
182 int line;
183 unsigned int port;
184 int irq;
185 int flags;
186 int xmit_fifo_size;
187 int custom_divisor;
188 int baud_base;
189 unsigned short close_delay;
190 char io_type;
191 char reserved_char[1];
192 int hub6;
193 unsigned short closing_wait; /* time to wait before closing */
194 unsigned short closing_wait2; /* no longer used... */
195 unsigned char *iomem_base;
196 unsigned short iomem_reg_shift;
197 unsigned int port_high;
198 unsigned long iomap_base; /* cookie passed into ioremap */
199 int reserved[1];
200 /* Paranoia (imagine 64bit kernel overwriting 32bit userspace stack) */
201 uint32_t bbox_reserved[16];
202};
Eric Andersen74400cc2001-10-18 04:11:39 +0000203static void console_init(void)
Eric Andersen0460ff21999-10-25 23:32:44 +0000204{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000205 struct serial_struct sr;
206 char *s;
Eric Andersen0460ff21999-10-25 23:32:44 +0000207
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000208 s = getenv("CONSOLE");
209 if (!s) s = getenv("console");
210 if (s) {
211 int fd = open(s, O_RDWR | O_NONBLOCK | O_NOCTTY);
212 if (fd >= 0) {
213 dup2(fd, 0);
214 dup2(fd, 1);
215 dup2(fd, 2);
216 while (fd > 2) close(fd--);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000217 }
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000218 messageD(L_LOG, "console='%s'", s);
Denis Vlasenkod8540f72007-06-14 07:53:06 +0000219 } else {
220 /* Make sure fd 0,1,2 are not closed */
221 bb_sanitize_stdio();
Eric Andersen07e52971999-11-07 07:38:08 +0000222 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000223
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000224 s = getenv("TERM");
225 if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
Denis Vlasenko2afabe82007-12-10 07:06:04 +0000226 /* Force the TERM setting to vt102 for serial console
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000227 * if TERM is set to linux (the default) */
228 if (!s || strcmp(s, "linux") == 0)
229 putenv((char*)"TERM=vt102");
Mike Frysingerbb50fdf2007-12-25 04:30:14 +0000230 if (!ENABLE_FEATURE_INIT_SYSLOG)
231 log_console = NULL;
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000232 } else if (!s)
233 putenv((char*)"TERM=linux");
Eric Andersen0460ff21999-10-25 23:32:44 +0000234}
Glenn L McGrathbaf55a82002-08-22 18:22:10 +0000235
Denis Vlasenko2afabe82007-12-10 07:06:04 +0000236/* Set terminal settings to reasonable defaults */
237static void set_sane_term(void)
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000238{
Denis Vlasenko2afabe82007-12-10 07:06:04 +0000239 struct termios tty;
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000240
Denis Vlasenko2afabe82007-12-10 07:06:04 +0000241 tcgetattr(STDIN_FILENO, &tty);
242
243 /* set control chars */
244 tty.c_cc[VINTR] = 3; /* C-c */
245 tty.c_cc[VQUIT] = 28; /* C-\ */
246 tty.c_cc[VERASE] = 127; /* C-? */
247 tty.c_cc[VKILL] = 21; /* C-u */
248 tty.c_cc[VEOF] = 4; /* C-d */
249 tty.c_cc[VSTART] = 17; /* C-q */
250 tty.c_cc[VSTOP] = 19; /* C-s */
251 tty.c_cc[VSUSP] = 26; /* C-z */
252
253 /* use line dicipline 0 */
254 tty.c_line = 0;
255
256 /* Make it be sane */
257 tty.c_cflag &= CBAUD | CBAUDEX | CSIZE | CSTOPB | PARENB | PARODD;
258 tty.c_cflag |= CREAD | HUPCL | CLOCAL;
259
260 /* input modes */
261 tty.c_iflag = ICRNL | IXON | IXOFF;
262
263 /* output modes */
264 tty.c_oflag = OPOST | ONLCR;
265
266 /* local modes */
267 tty.c_lflag =
268 ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN;
269
270 tcsetattr(STDIN_FILENO, TCSANOW, &tty);
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000271}
272
Bernhard Reutner-Fischer0da069d2006-05-29 12:54:16 +0000273/* Open the new terminal device */
Denis Vlasenkod55268d2007-12-26 18:32:58 +0000274static void open_stdio_to_tty(const char* tty_name, int exit_on_failure)
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000275{
276 /* empty tty_name means "use init's tty", else... */
277 if (tty_name[0]) {
Denis Vlasenkod55268d2007-12-26 18:32:58 +0000278 int fd;
279 close(0);
280 /* fd can be only < 0 or 0: */
281 fd = device_open(tty_name, O_RDWR);
282 if (fd) {
Denis Vlasenko966bb432007-02-27 19:20:33 +0000283 message(L_LOG | L_CONSOLE, "Can't open %s: %s",
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000284 tty_name, strerror(errno));
Denis Vlasenkod55268d2007-12-26 18:32:58 +0000285 if (exit_on_failure)
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000286 _exit(1);
Denis Vlasenkod55268d2007-12-26 18:32:58 +0000287 if (ENABLE_DEBUG_INIT)
Mike Frysingerbb50fdf2007-12-25 04:30:14 +0000288 _exit(2);
Denis Vlasenkod55268d2007-12-26 18:32:58 +0000289 halt_reboot_pwoff(SIGUSR1); /* halt the system */
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000290 }
Denis Vlasenkod55268d2007-12-26 18:32:58 +0000291 dup2(0, 1);
292 dup2(0, 2);
Bernhard Reutner-Fischer0da069d2006-05-29 12:54:16 +0000293 }
Denis Vlasenkod238a472007-03-05 19:22:04 +0000294 set_sane_term();
Bernhard Reutner-Fischer0da069d2006-05-29 12:54:16 +0000295}
296
Denis Vlasenko2afabe82007-12-10 07:06:04 +0000297/* Used only by run_actions */
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +0000298static pid_t run(const struct init_action *a)
Eric Andersen0298be82002-03-05 15:12:19 +0000299{
Bernhard Reutner-Fischer3ab30802006-05-30 12:10:29 +0000300 int i;
Mike Frysinger10427ab2005-07-06 05:00:48 +0000301 pid_t pid;
Denis Vlasenko06c0a712007-01-29 22:51:44 +0000302 char *s, *tmpCmd, *cmdpath;
303 char *cmd[INIT_BUFFS_SIZE];
Glenn L McGrathbaf55a82002-08-22 18:22:10 +0000304 char buf[INIT_BUFFS_SIZE + 6]; /* INIT_BUFFS_SIZE+strlen("exec ")+1 */
Eric Andersen0298be82002-03-05 15:12:19 +0000305 sigset_t nmask, omask;
Erik Andersenac6e71f2000-01-08 22:04:33 +0000306
Denis Vlasenko2afabe82007-12-10 07:06:04 +0000307 /* Block sigchild while forking (why?) */
Eric Andersen0298be82002-03-05 15:12:19 +0000308 sigemptyset(&nmask);
309 sigaddset(&nmask, SIGCHLD);
310 sigprocmask(SIG_BLOCK, &nmask, &omask);
Denis Vlasenko966bb432007-02-27 19:20:33 +0000311 pid = fork();
312 sigprocmask(SIG_SETMASK, &omask, NULL);
Eric Andersen0298be82002-03-05 15:12:19 +0000313
Denis Vlasenko2afabe82007-12-10 07:06:04 +0000314 if (pid < 0)
315 message(L_LOG | L_CONSOLE, "Can't fork");
Denis Vlasenko966bb432007-02-27 19:20:33 +0000316 if (pid)
317 return pid;
Eric Andersen0298be82002-03-05 15:12:19 +0000318
Denis Vlasenko2afabe82007-12-10 07:06:04 +0000319 /* Child */
320
Denis Vlasenko966bb432007-02-27 19:20:33 +0000321 /* Reset signal handlers that were set by the parent process */
322 signal(SIGUSR1, SIG_DFL);
323 signal(SIGUSR2, SIG_DFL);
324 signal(SIGINT, SIG_DFL);
325 signal(SIGTERM, SIG_DFL);
326 signal(SIGHUP, SIG_DFL);
327 signal(SIGQUIT, SIG_DFL);
328 signal(SIGCONT, SIG_DFL);
329 signal(SIGSTOP, SIG_DFL);
330 signal(SIGTSTP, SIG_DFL);
Eric Andersen2f6c04f1999-11-01 23:59:44 +0000331
Denis Vlasenko966bb432007-02-27 19:20:33 +0000332 /* Create a new session and make ourself the process
333 * group leader */
334 setsid();
Eric Andersen599e3ce2002-07-03 11:08:10 +0000335
Denis Vlasenko966bb432007-02-27 19:20:33 +0000336 /* Open the new terminal device */
Denis Vlasenko2afabe82007-12-10 07:06:04 +0000337 open_stdio_to_tty(a->terminal, 1 /* - exit if open fails*/);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000338
Denis Vlasenko2afabe82007-12-10 07:06:04 +0000339#ifdef BUT_RUN_ACTIONS_ALREADY_DOES_WAITING
Denis Vlasenko966bb432007-02-27 19:20:33 +0000340 /* If the init Action requires us to wait, then force the
341 * supplied terminal to be the controlling tty. */
Denis Vlasenko5adfa442007-12-25 16:08:53 +0000342 if (a->action & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) {
Denis Vlasenko966bb432007-02-27 19:20:33 +0000343 /* Now fork off another process to just hang around */
Denis Vlasenko6bef3d12007-11-06 03:05:54 +0000344 pid = fork();
Denis Vlasenkof6ccc622007-11-10 01:57:35 +0000345 if (pid < 0) {
Denis Vlasenko966bb432007-02-27 19:20:33 +0000346 message(L_LOG | L_CONSOLE, "Can't fork");
347 _exit(1);
348 }
349
350 if (pid > 0) {
Denis Vlasenko2afabe82007-12-10 07:06:04 +0000351 /* Parent - wait till the child is done */
Denis Vlasenko966bb432007-02-27 19:20:33 +0000352 signal(SIGINT, SIG_IGN);
353 signal(SIGTSTP, SIG_IGN);
354 signal(SIGQUIT, SIG_IGN);
355 signal(SIGCHLD, SIG_DFL);
356
Denis Vlasenko2afabe82007-12-10 07:06:04 +0000357 waitfor(pid);
Denis Vlasenko966bb432007-02-27 19:20:33 +0000358 /* See if stealing the controlling tty back is necessary */
359 if (tcgetpgrp(0) != getpid())
360 _exit(0);
361
362 /* Use a temporary process to steal the controlling tty. */
Denis Vlasenko6bef3d12007-11-06 03:05:54 +0000363 pid = fork();
364 if (pid < 0) {
Denis Vlasenko966bb432007-02-27 19:20:33 +0000365 message(L_LOG | L_CONSOLE, "Can't fork");
Eric Andersen0298be82002-03-05 15:12:19 +0000366 _exit(1);
367 }
Denis Vlasenko966bb432007-02-27 19:20:33 +0000368 if (pid == 0) {
369 setsid();
370 ioctl(0, TIOCSCTTY, 1);
Eric Andersen0298be82002-03-05 15:12:19 +0000371 _exit(0);
372 }
Denis Vlasenko2afabe82007-12-10 07:06:04 +0000373 waitfor(pid);
Denis Vlasenko966bb432007-02-27 19:20:33 +0000374 _exit(0);
Eric Andersen0298be82002-03-05 15:12:19 +0000375 }
376
Denis Vlasenko2afabe82007-12-10 07:06:04 +0000377 /* Child - fall though to actually execute things */
Denis Vlasenko966bb432007-02-27 19:20:33 +0000378 }
Denis Vlasenko5adfa442007-12-25 16:08:53 +0000379#endif
Denis Vlasenko966bb432007-02-27 19:20:33 +0000380
381 /* See if any special /bin/sh requiring characters are present */
382 if (strpbrk(a->command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
383 cmd[0] = (char*)DEFAULT_SHELL;
384 cmd[1] = (char*)"-c";
385 cmd[2] = strcat(strcpy(buf, "exec "), a->command);
386 cmd[3] = NULL;
387 } else {
388 /* Convert command (char*) into cmd (char**, one word per string) */
389 strcpy(buf, a->command);
390 s = buf;
391 for (tmpCmd = buf, i = 0; (tmpCmd = strsep(&s, " \t")) != NULL;) {
392 if (*tmpCmd != '\0') {
393 cmd[i] = tmpCmd;
394 i++;
395 }
396 }
397 cmd[i] = NULL;
398 }
399
400 cmdpath = cmd[0];
401
402 /*
403 * Interactive shells want to see a dash in argv[0]. This
404 * typically is handled by login, argv will be setup this
405 * way if a dash appears at the front of the command path
406 * (like "-/bin/sh").
407 */
408 if (*cmdpath == '-') {
409 /* skip over the dash */
410 ++cmdpath;
411
Denis Vlasenko2afabe82007-12-10 07:06:04 +0000412#ifdef WHY_WE_DO_THIS_SHELL_MUST_HANDLE_THIS_ITSELF
Denis Vlasenko5adfa442007-12-25 16:08:53 +0000413 /* find the last component in the command pathname */
414 s = bb_get_last_path_component_nostrip(cmdpath);
415 /* make a new argv[0] */
416 cmd[0] = malloc(strlen(s) + 2);
417 if (cmd[0] == NULL) {
418 message(L_LOG | L_CONSOLE, bb_msg_memory_exhausted);
419 cmd[0] = cmdpath;
420 } else {
421 cmd[0][0] = '-';
422 strcpy(cmd[0] + 1, s);
Mike Frysingerbb50fdf2007-12-25 04:30:14 +0000423 }
Denis Vlasenko5adfa442007-12-25 16:08:53 +0000424#endif
Denis Vlasenko2afabe82007-12-10 07:06:04 +0000425
Denis Vlasenkod55268d2007-12-26 18:32:58 +0000426 /* _Attempt_ to make stdin a controlling tty. */
Mike Frysingerbb50fdf2007-12-25 04:30:14 +0000427 if (ENABLE_FEATURE_INIT_SCTTY)
428 ioctl(0, TIOCSCTTY, 0 /*only try, don't steal*/);
Denis Vlasenko966bb432007-02-27 19:20:33 +0000429 }
Eric Andersen7ef1a5b2001-03-20 17:39:08 +0000430
Denis Vlasenko966bb432007-02-27 19:20:33 +0000431 if (a->action & ASKFIRST) {
Denis Vlasenko6ca409e2007-08-12 20:58:27 +0000432 static const char press_enter[] ALIGN1 =
Denis Vlasenko966bb432007-02-27 19:20:33 +0000433#ifdef CUSTOMIZED_BANNER
434#include CUSTOMIZED_BANNER
Eric Andersen1f50e842004-08-16 09:29:42 +0000435#endif
Denis Vlasenko966bb432007-02-27 19:20:33 +0000436 "\nPlease press Enter to activate this console. ";
437 char c;
438 /*
439 * Save memory by not exec-ing anything large (like a shell)
440 * before the user wants it. This is critical if swap is not
441 * enabled and the system has low memory. Generally this will
442 * be run on the second virtual console, and the first will
443 * be allowed to start a shell or whatever an init script
444 * specifies.
445 */
446 messageD(L_LOG, "waiting for enter to start '%s'"
447 "(pid %d, tty '%s')\n",
448 cmdpath, getpid(), a->terminal);
449 full_write(1, press_enter, sizeof(press_enter) - 1);
Denis Vlasenko2afabe82007-12-10 07:06:04 +0000450 while (safe_read(0, &c, 1) == 1 && c != '\n')
451 continue;
Denis Vlasenko966bb432007-02-27 19:20:33 +0000452 }
Denis Vlasenko2afabe82007-12-10 07:06:04 +0000453
Denis Vlasenko966bb432007-02-27 19:20:33 +0000454 /* Log the process name and args */
455 message(L_LOG, "starting pid %d, tty '%s': '%s'",
456 getpid(), a->terminal, cmdpath);
Eric Andersen7e3bf6e2000-09-14 22:01:31 +0000457
Mike Frysingerbb50fdf2007-12-25 04:30:14 +0000458 if (ENABLE_FEATURE_INIT_COREDUMPS) {
Denis Vlasenko966bb432007-02-27 19:20:33 +0000459 struct stat sb;
460 if (stat(CORE_ENABLE_FLAG_FILE, &sb) == 0) {
461 struct rlimit limit;
Glenn L McGrathbaf55a82002-08-22 18:22:10 +0000462
Denis Vlasenko966bb432007-02-27 19:20:33 +0000463 limit.rlim_cur = RLIM_INFINITY;
464 limit.rlim_max = RLIM_INFINITY;
465 setrlimit(RLIMIT_CORE, &limit);
Erik Andersen983b51b2000-04-04 18:14:25 +0000466 }
Erik Andersen05df2392000-01-13 04:43:48 +0000467 }
Mike Frysingerbb50fdf2007-12-25 04:30:14 +0000468
Denis Vlasenko966bb432007-02-27 19:20:33 +0000469 /* Now run it. The new program will take over this PID,
470 * so nothing further in init.c should be run. */
471 BB_EXECVP(cmdpath, cmd);
472
473 /* We're still here? Some error happened. */
474 message(L_LOG | L_CONSOLE, "Cannot run '%s': %s",
475 cmdpath, strerror(errno));
476 _exit(-1);
Eric Andersen0460ff21999-10-25 23:32:44 +0000477}
478
Eric Andersen0298be82002-03-05 15:12:19 +0000479/* Run all commands of a particular type */
480static void run_actions(int action)
Eric Andersen219d6f51999-11-02 19:43:01 +0000481{
Eric Andersen0298be82002-03-05 15:12:19 +0000482 struct init_action *a, *tmp;
Eric Andersen219d6f51999-11-02 19:43:01 +0000483
Eric Andersen0298be82002-03-05 15:12:19 +0000484 for (a = init_action_list; a; a = tmp) {
485 tmp = a->next;
Eric Andersenc97ec342001-04-03 18:01:51 +0000486 if (a->action == action) {
Denis Vlasenkod7e2e122007-12-10 08:40:29 +0000487 // Pointless: run() will error out if open of device fails.
488 ///* a->terminal of "" means "init's console" */
489 //if (a->terminal[0] && access(a->terminal, R_OK | W_OK)) {
490 // //message(L_LOG | L_CONSOLE, "Device %s cannot be opened in RW mode", a->terminal /*, strerror(errno)*/);
491 // delete_init_action(a);
492 //} else
493 if (a->action & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) {
Denis Vlasenko2afabe82007-12-10 07:06:04 +0000494 waitfor(run(a));
Eric Andersen0298be82002-03-05 15:12:19 +0000495 delete_init_action(a);
496 } else if (a->action & ONCE) {
497 run(a);
498 delete_init_action(a);
Glenn L McGrathbaf55a82002-08-22 18:22:10 +0000499 } else if (a->action & (RESPAWN | ASKFIRST)) {
Eric Andersen0298be82002-03-05 15:12:19 +0000500 /* Only run stuff with pid==0. If they have
501 * a pid, that means it is still running */
502 if (a->pid == 0) {
503 a->pid = run(a);
504 }
505 }
Erik Andersene132f4b2000-02-09 04:16:43 +0000506 }
507 }
508}
509
Eric Andersen2c1de612003-04-24 11:41:28 +0000510static void init_reboot(unsigned long magic)
511{
512 pid_t pid;
513 /* We have to fork here, since the kernel calls do_exit(0) in
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000514 * linux/kernel/sys.c, which can cause the machine to panic when
Eric Andersen2c1de612003-04-24 11:41:28 +0000515 * the init process is killed.... */
Denis Vlasenko9b1381f2007-01-03 02:56:00 +0000516 pid = vfork();
517 if (pid == 0) { /* child */
Eric Andersen2c1de612003-04-24 11:41:28 +0000518 reboot(magic);
Eric Andersen2c1de612003-04-24 11:41:28 +0000519 _exit(0);
520 }
Denis Vlasenkofb0eba72008-01-02 19:55:04 +0000521 waitfor(pid);
Eric Andersen2c1de612003-04-24 11:41:28 +0000522}
523
Denis Vlasenkod55268d2007-12-26 18:32:58 +0000524static void kill_all_processes(void)
Eric Andersencc8ed391999-10-05 16:24:54 +0000525{
Eric Andersen813d88c2001-10-28 22:49:48 +0000526 sigset_t block_signals;
Erik Andersene132f4b2000-02-09 04:16:43 +0000527
Eric Andersena9cc8962002-09-16 06:49:06 +0000528 /* run everything to be run at "shutdown". This is done _prior_
529 * to killing everything, in case people wish to use scripts to
530 * shut things down gracefully... */
531 run_actions(SHUTDOWN);
532
Eric Andersen72f9a422001-10-28 05:12:20 +0000533 /* first disable all our signals */
Denis Vlasenkod55268d2007-12-26 18:32:58 +0000534 sigfillset(&block_signals);
535 /*sigemptyset(&block_signals);
Eric Andersen72f9a422001-10-28 05:12:20 +0000536 sigaddset(&block_signals, SIGHUP);
Mike Frysingera77b4f32005-04-16 08:21:34 +0000537 sigaddset(&block_signals, SIGQUIT);
Eric Andersen72f9a422001-10-28 05:12:20 +0000538 sigaddset(&block_signals, SIGCHLD);
539 sigaddset(&block_signals, SIGUSR1);
540 sigaddset(&block_signals, SIGUSR2);
541 sigaddset(&block_signals, SIGINT);
542 sigaddset(&block_signals, SIGTERM);
Eric Andersened8a9be2001-11-30 19:10:58 +0000543 sigaddset(&block_signals, SIGCONT);
544 sigaddset(&block_signals, SIGSTOP);
Denis Vlasenkod55268d2007-12-26 18:32:58 +0000545 sigaddset(&block_signals, SIGTSTP);*/
Eric Andersen72f9a422001-10-28 05:12:20 +0000546 sigprocmask(SIG_BLOCK, &block_signals, NULL);
Erik Andersen7dc16072000-01-04 01:10:25 +0000547
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000548 message(L_CONSOLE | L_LOG, "The system is going down NOW!");
549
Erik Andersene49d5ec2000-02-08 19:58:47 +0000550 /* Allow Ctrl-Alt-Del to reboot system. */
Erik Andersen4f3f7572000-04-28 00:18:56 +0000551 init_reboot(RB_ENABLE_CAD);
Erik Andersene132f4b2000-02-09 04:16:43 +0000552
Erik Andersene49d5ec2000-02-08 19:58:47 +0000553 /* Send signals to every process _except_ pid 1 */
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000554 message(L_CONSOLE | L_LOG, "Sending SIG%s to all processes", "TERM");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000555 kill(-1, SIGTERM);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000556 sync();
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000557 sleep(1);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000558
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000559 message(L_CONSOLE | L_LOG, "Sending SIG%s to all processes", "KILL");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000560 kill(-1, SIGKILL);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000561 sync();
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000562 sleep(1);
Eric Andersencc8ed391999-10-05 16:24:54 +0000563}
564
Denis Vlasenkod55268d2007-12-26 18:32:58 +0000565static void halt_reboot_pwoff(int sig)
Denis Vlasenko2afabe82007-12-10 07:06:04 +0000566{
567 const char *m;
568 int rb;
569
Denis Vlasenkod55268d2007-12-26 18:32:58 +0000570 kill_all_processes();
Denis Vlasenko2afabe82007-12-10 07:06:04 +0000571
572 m = "halt";
573 rb = RB_HALT_SYSTEM;
574 if (sig == SIGTERM) {
575 m = "reboot";
576 rb = RB_AUTOBOOT;
577 } else if (sig == SIGUSR2) {
578 m = "poweroff";
579 rb = RB_POWER_OFF;
580 }
581 message(L_CONSOLE | L_LOG, "Requesting system %s", m);
582 /* allow time for last message to reach serial console */
583 sleep(2);
584 init_reboot(rb);
585 loop_forever();
586}
587
Denis Vlasenkod55268d2007-12-26 18:32:58 +0000588/* Handler for HUP and QUIT - exec "restart" action,
589 * else (no such action defined) do nothing */
590static void exec_restart_action(int sig ATTRIBUTE_UNUSED)
Eric Andersen730f8262001-12-17 23:13:08 +0000591{
Eric Andersen0298be82002-03-05 15:12:19 +0000592 struct init_action *a, *tmp;
Eric Andersen5222d312002-07-03 05:15:23 +0000593 sigset_t unblock_signals;
Glenn L McGrathbaf55a82002-08-22 18:22:10 +0000594
Eric Andersen0298be82002-03-05 15:12:19 +0000595 for (a = init_action_list; a; a = tmp) {
596 tmp = a->next;
597 if (a->action & RESTART) {
Denis Vlasenkod55268d2007-12-26 18:32:58 +0000598 kill_all_processes();
Eric Andersen5222d312002-07-03 05:15:23 +0000599
Denis Vlasenkod55268d2007-12-26 18:32:58 +0000600 /* unblock all signals (blocked in kill_all_processes()) */
601 sigfillset(&unblock_signals);
602 /*sigemptyset(&unblock_signals);
Eric Andersen5222d312002-07-03 05:15:23 +0000603 sigaddset(&unblock_signals, SIGHUP);
Mike Frysingera77b4f32005-04-16 08:21:34 +0000604 sigaddset(&unblock_signals, SIGQUIT);
Eric Andersen5222d312002-07-03 05:15:23 +0000605 sigaddset(&unblock_signals, SIGCHLD);
606 sigaddset(&unblock_signals, SIGUSR1);
607 sigaddset(&unblock_signals, SIGUSR2);
608 sigaddset(&unblock_signals, SIGINT);
609 sigaddset(&unblock_signals, SIGTERM);
610 sigaddset(&unblock_signals, SIGCONT);
611 sigaddset(&unblock_signals, SIGSTOP);
Denis Vlasenkod55268d2007-12-26 18:32:58 +0000612 sigaddset(&unblock_signals, SIGTSTP);*/
Eric Andersen5222d312002-07-03 05:15:23 +0000613 sigprocmask(SIG_UNBLOCK, &unblock_signals, NULL);
614
Eric Andersen3c8064f2003-07-05 08:29:01 +0000615 /* Open the new terminal device */
Denis Vlasenkod55268d2007-12-26 18:32:58 +0000616 open_stdio_to_tty(a->terminal, 0 /* - halt if open fails */);
Eric Andersen3c8064f2003-07-05 08:29:01 +0000617
Denis Vlasenkoec27feb2007-02-17 15:52:02 +0000618 messageD(L_CONSOLE | L_LOG, "Trying to re-exec %s", a->command);
Denis Vlasenko4921b542007-02-03 02:17:41 +0000619 BB_EXECLP(a->command, a->command, NULL);
Glenn L McGrathbaf55a82002-08-22 18:22:10 +0000620
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000621 message(L_CONSOLE | L_LOG, "Cannot run '%s': %s",
622 a->command, strerror(errno));
Eric Andersen730f8262001-12-17 23:13:08 +0000623 sleep(2);
624 init_reboot(RB_HALT_SYSTEM);
625 loop_forever();
626 }
627 }
628}
629
"Vladimir N. Oleynik"1f04c9d2006-02-01 14:47:52 +0000630static void ctrlaltdel_signal(int sig ATTRIBUTE_UNUSED)
Eric Andersenc97ec342001-04-03 18:01:51 +0000631{
632 run_actions(CTRLALTDEL);
633}
634
Eric Andersen0298be82002-03-05 15:12:19 +0000635/* The SIGSTOP & SIGTSTP handler */
"Vladimir N. Oleynik"1f04c9d2006-02-01 14:47:52 +0000636static void stop_handler(int sig ATTRIBUTE_UNUSED)
Eric Andersened8a9be2001-11-30 19:10:58 +0000637{
Eric Andersen0298be82002-03-05 15:12:19 +0000638 int saved_errno = errno;
Eric Andersened8a9be2001-11-30 19:10:58 +0000639
640 got_cont = 0;
Glenn L McGrathbaf55a82002-08-22 18:22:10 +0000641 while (!got_cont)
642 pause();
Denis Vlasenko2afabe82007-12-10 07:06:04 +0000643
Eric Andersened8a9be2001-11-30 19:10:58 +0000644 errno = saved_errno;
645}
646
Glenn L McGrathbaf55a82002-08-22 18:22:10 +0000647/* The SIGCONT handler */
"Vladimir N. Oleynik"1f04c9d2006-02-01 14:47:52 +0000648static void cont_handler(int sig ATTRIBUTE_UNUSED)
Eric Andersened8a9be2001-11-30 19:10:58 +0000649{
650 got_cont = 1;
651}
652
Denis Vlasenko2afabe82007-12-10 07:06:04 +0000653static void new_init_action(uint8_t action, const char *command, const char *cons)
Erik Andersen7dc16072000-01-04 01:10:25 +0000654{
Eric Andersen22718092004-10-08 08:17:39 +0000655 struct init_action *new_action, *a, *last;
Erik Andersen9e737252000-01-06 01:16:13 +0000656
"Vladimir N. Oleynik"6c35c7c2005-10-12 15:34:25 +0000657 if (strcmp(cons, bb_dev_null) == 0 && (action & ASKFIRST))
Eric Andersen1644db92001-09-05 20:18:15 +0000658 return;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000659
Eric Andersen0298be82002-03-05 15:12:19 +0000660 /* Append to the end of the list */
Eric Andersen22718092004-10-08 08:17:39 +0000661 for (a = last = init_action_list; a; a = a->next) {
Eric Andersen82baf632004-10-08 08:21:54 +0000662 /* don't enter action if it's already in the list,
663 * but do overwrite existing actions */
Denis Vlasenkoec27feb2007-02-17 15:52:02 +0000664 if ((strcmp(a->command, command) == 0)
665 && (strcmp(a->terminal, cons) == 0)
666 ) {
Eric Andersen82baf632004-10-08 08:21:54 +0000667 a->action = action;
Eric Andersen6fd0e312003-07-22 09:48:56 +0000668 return;
669 }
Eric Andersen22718092004-10-08 08:17:39 +0000670 last = a;
Eric Andersen6fd0e312003-07-22 09:48:56 +0000671 }
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000672
673 new_action = xzalloc(sizeof(struct init_action));
Eric Andersen22718092004-10-08 08:17:39 +0000674 if (last) {
675 last->next = new_action;
Eric Andersen1644db92001-09-05 20:18:15 +0000676 } else {
Eric Andersen0298be82002-03-05 15:12:19 +0000677 init_action_list = new_action;
Eric Andersen1644db92001-09-05 20:18:15 +0000678 }
Eric Andersen0826b6b2002-07-03 23:50:16 +0000679 strcpy(new_action->command, command);
Eric Andersen0298be82002-03-05 15:12:19 +0000680 new_action->action = action;
Eric Andersen0826b6b2002-07-03 23:50:16 +0000681 strcpy(new_action->terminal, cons);
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000682 messageD(L_LOG | L_CONSOLE, "command='%s' action=%d tty='%s'\n",
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +0000683 new_action->command, new_action->action, new_action->terminal);
Erik Andersen7dc16072000-01-04 01:10:25 +0000684}
685
Glenn L McGrathbaf55a82002-08-22 18:22:10 +0000686static void delete_init_action(struct init_action *action)
Erik Andersen7dc16072000-01-04 01:10:25 +0000687{
Eric Andersen0298be82002-03-05 15:12:19 +0000688 struct init_action *a, *b = NULL;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000689
Eric Andersen0298be82002-03-05 15:12:19 +0000690 for (a = init_action_list; a; b = a, a = a->next) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000691 if (a == action) {
692 if (b == NULL) {
Eric Andersen0298be82002-03-05 15:12:19 +0000693 init_action_list = a->next;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000694 } else {
Eric Andersen0298be82002-03-05 15:12:19 +0000695 b->next = a->next;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000696 }
697 free(a);
698 break;
699 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000700 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000701}
702
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000703/* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined,
Erik Andersen9e737252000-01-06 01:16:13 +0000704 * then parse_inittab() simply adds in some default
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000705 * actions(i.e., runs INIT_SCRIPT and then starts a pair
706 * of "askfirst" shells). If CONFIG_FEATURE_USE_INITTAB
707 * _is_ defined, but /etc/inittab is missing, this
Erik Andersen812d4662000-01-07 18:30:40 +0000708 * results in the same set of default behaviors.
Glenn L McGrathbaf55a82002-08-22 18:22:10 +0000709 */
Eric Andersen3e6ff902001-03-09 21:24:12 +0000710static void parse_inittab(void)
Erik Andersen7dc16072000-01-04 01:10:25 +0000711{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000712 FILE *file;
Denis Vlasenkoec5631b2007-12-25 01:08:58 +0000713 char buf[INIT_BUFFS_SIZE];
Erik Andersen7dc16072000-01-04 01:10:25 +0000714
Mike Frysingerbb50fdf2007-12-25 04:30:14 +0000715 if (ENABLE_FEATURE_USE_INITTAB)
716 file = fopen(INITTAB, "r");
717 else
718 file = NULL;
719
720 /* No inittab file -- set up some default behavior */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000721 if (file == NULL) {
Eric Andersenc97ec342001-04-03 18:01:51 +0000722 /* Reboot on Ctrl-Alt-Del */
Denis Vlasenko2f0c0d02007-01-21 00:41:04 +0000723 new_init_action(CTRLALTDEL, "reboot", "");
Eric Andersen1644db92001-09-05 20:18:15 +0000724 /* Umount all filesystems on halt/reboot */
Denis Vlasenko2f0c0d02007-01-21 00:41:04 +0000725 new_init_action(SHUTDOWN, "umount -a -r", "");
Eric Andersen1644db92001-09-05 20:18:15 +0000726 /* Swapoff on halt/reboot */
Denis Vlasenko2afabe82007-12-10 07:06:04 +0000727 if (ENABLE_SWAPONOFF)
728 new_init_action(SHUTDOWN, "swapoff -a", "");
Eric Andersen730f8262001-12-17 23:13:08 +0000729 /* Prepare to restart init when a HUP is received */
Denis Vlasenko2f0c0d02007-01-21 00:41:04 +0000730 new_init_action(RESTART, "init", "");
Eric Andersen3bc2b202002-07-29 06:39:58 +0000731 /* Askfirst shell on tty1-4 */
Glenn L McGrathdc4e75e2003-09-02 02:36:18 +0000732 new_init_action(ASKFIRST, bb_default_login_shell, "");
733 new_init_action(ASKFIRST, bb_default_login_shell, VC_2);
734 new_init_action(ASKFIRST, bb_default_login_shell, VC_3);
735 new_init_action(ASKFIRST, bb_default_login_shell, VC_4);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000736 /* sysinit */
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +0000737 new_init_action(SYSINIT, INIT_SCRIPT, "");
Erik Andersen7dc16072000-01-04 01:10:25 +0000738
Erik Andersene49d5ec2000-02-08 19:58:47 +0000739 return;
Erik Andersen9e737252000-01-06 01:16:13 +0000740 }
Erik Andersen7dc16072000-01-04 01:10:25 +0000741
Eric Andersen0826b6b2002-07-03 23:50:16 +0000742 while (fgets(buf, INIT_BUFFS_SIZE, file) != NULL) {
Denis Vlasenkoec5631b2007-12-25 01:08:58 +0000743 static const char actions[] =
744 STR_SYSINIT "sysinit\0"
745 STR_RESPAWN "respawn\0"
746 STR_ASKFIRST "askfirst\0"
747 STR_WAIT "wait\0"
748 STR_ONCE "once\0"
749 STR_CTRLALTDEL "ctrlaltdel\0"
750 STR_SHUTDOWN "shutdown\0"
751 STR_RESTART "restart\0"
752 ;
753 char tmpConsole[CONSOLE_NAME_SIZE];
754 char *id, *runlev, *action, *command;
Denis Vlasenko2afabe82007-12-10 07:06:04 +0000755 const char *a;
756
Eric Andersenb5966362000-05-31 20:04:38 +0000757 /* Skip leading spaces */
Denis Vlasenkoec5631b2007-12-25 01:08:58 +0000758 id = skip_whitespace(buf);
Denis Vlasenkoec5631b2007-12-25 01:08:58 +0000759 /* Trim the trailing '\n' */
760 *strchrnul(id, '\n') = '\0';
Denis Vlasenkoc882f342008-01-29 09:56:21 +0000761 /* Skip the line if it is a comment */
762 if (*id == '#' || *id == '\0')
763 continue;
Erik Andersen7dc16072000-01-04 01:10:25 +0000764
Denis Vlasenkoec5631b2007-12-25 01:08:58 +0000765 /* Line is: "id:runlevel_ignored:action:command" */
Eric Andersenb5966362000-05-31 20:04:38 +0000766 runlev = strchr(id, ':');
Denis Vlasenkoec5631b2007-12-25 01:08:58 +0000767 if (runlev == NULL /*|| runlev[1] == '\0' - not needed */)
768 goto bad_entry;
769 action = strchr(runlev + 1, ':');
770 if (action == NULL /*|| action[1] == '\0' - not needed */)
771 goto bad_entry;
772 command = strchr(action + 1, ':');
773 if (command == NULL || command[1] == '\0')
774 goto bad_entry;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000775
Denis Vlasenkoec5631b2007-12-25 01:08:58 +0000776 *command = '\0'; /* action => ":action\0" now */
Denis Vlasenko2afabe82007-12-10 07:06:04 +0000777 for (a = actions; a[0]; a += strlen(a) + 1) {
Denis Vlasenkoec5631b2007-12-25 01:08:58 +0000778 if (strcmp(a + 1, action + 1) == 0) {
779 *runlev = '\0';
Eric Andersenb5966362000-05-31 20:04:38 +0000780 if (*id != '\0') {
Denis Vlasenko51742f42007-04-12 00:32:05 +0000781 if (strncmp(id, "/dev/", 5) == 0)
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +0000782 id += 5;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000783 strcpy(tmpConsole, "/dev/");
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +0000784 safe_strncpy(tmpConsole + 5, id,
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000785 sizeof(tmpConsole) - 5);
Eric Andersenb5966362000-05-31 20:04:38 +0000786 id = tmpConsole;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000787 }
Denis Vlasenkoec5631b2007-12-25 01:08:58 +0000788 new_init_action((uint8_t)a[0], command + 1, id);
789 goto next_line;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000790 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000791 }
Denis Vlasenkoec5631b2007-12-25 01:08:58 +0000792 *command = ':';
793 /* Choke on an unknown action */
794 bad_entry:
795 message(L_LOG | L_CONSOLE, "Bad inittab entry: %s", id);
796 next_line: ;
Erik Andersen7dc16072000-01-04 01:10:25 +0000797 }
Eric Andersend8636ca2002-05-15 22:19:09 +0000798 fclose(file);
Erik Andersen7dc16072000-01-04 01:10:25 +0000799}
800
"Vladimir N. Oleynik"1f04c9d2006-02-01 14:47:52 +0000801static void reload_signal(int sig ATTRIBUTE_UNUSED)
Eric Andersen6fd0e312003-07-22 09:48:56 +0000802{
Eric Andersen82baf632004-10-08 08:21:54 +0000803 struct init_action *a, *tmp;
804
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000805 message(L_LOG, "reloading /etc/inittab");
Eric Andersen82baf632004-10-08 08:21:54 +0000806
807 /* disable old entrys */
Denis Vlasenkoec5631b2007-12-25 01:08:58 +0000808 for (a = init_action_list; a; a = a->next) {
Eric Andersen82baf632004-10-08 08:21:54 +0000809 a->action = ONCE;
810 }
811
812 parse_inittab();
813
Mike Frysingerbb50fdf2007-12-25 04:30:14 +0000814 if (ENABLE_FEATURE_KILL_REMOVED) {
Denis Vlasenkod55268d2007-12-26 18:32:58 +0000815 /* Be nice and send SIGTERM first */
Mike Frysingerbb50fdf2007-12-25 04:30:14 +0000816 for (a = init_action_list; a; a = a->next) {
817 pid_t pid = a->pid;
818 if ((a->action & ONCE) && pid != 0) {
Mike Frysingerbb50fdf2007-12-25 04:30:14 +0000819 kill(pid, SIGTERM);
Denis Vlasenkoec5631b2007-12-25 01:08:58 +0000820 }
Denis Vlasenkoec5631b2007-12-25 01:08:58 +0000821 }
Denis Vlasenkod55268d2007-12-26 18:32:58 +0000822#if CONFIG_FEATURE_KILL_DELAY
823 if (fork() == 0) { /* child */
824 sleep(CONFIG_FEATURE_KILL_DELAY);
825 for (a = init_action_list; a; a = a->next) {
826 pid_t pid = a->pid;
827 if ((a->action & ONCE) && pid != 0) {
828 kill(pid, SIGKILL);
829 }
830 }
831 _exit(0);
832 }
833#endif
Denis Vlasenkoec5631b2007-12-25 01:08:58 +0000834 }
Denis Vlasenkoec5631b2007-12-25 01:08:58 +0000835
Eric Andersen82baf632004-10-08 08:21:54 +0000836 /* remove unused entrys */
837 for (a = init_action_list; a; a = tmp) {
838 tmp = a->next;
Denis Vlasenko219d14d2007-03-24 15:40:16 +0000839 if ((a->action & (ONCE | SYSINIT | WAIT)) && a->pid == 0) {
Eric Andersen82baf632004-10-08 08:21:54 +0000840 delete_init_action(a);
841 }
842 }
Eric Andersen6fd0e312003-07-22 09:48:56 +0000843 run_actions(RESPAWN);
Eric Andersen6fd0e312003-07-22 09:48:56 +0000844}
Eric Andersen82baf632004-10-08 08:21:54 +0000845
Denis Vlasenko9b49a5e2007-10-11 10:05:36 +0000846int init_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
Rob Landleydfba7412006-03-06 20:47:33 +0000847int init_main(int argc, char **argv)
Eric Andersen0460ff21999-10-25 23:32:44 +0000848{
Eric Andersen0298be82002-03-05 15:12:19 +0000849 struct init_action *a;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000850 pid_t wpid;
Eric Andersen0460ff21999-10-25 23:32:44 +0000851
Denis Vlasenko9b1381f2007-01-03 02:56:00 +0000852 die_sleep = 30 * 24*60*60; /* if xmalloc will ever die... */
853
Eric Andersen730f8262001-12-17 23:13:08 +0000854 if (argc > 1 && !strcmp(argv[1], "-q")) {
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000855 return kill(1, SIGHUP);
Eric Andersen730f8262001-12-17 23:13:08 +0000856 }
Mike Frysingerbb50fdf2007-12-25 04:30:14 +0000857
858 if (!ENABLE_DEBUG_INIT) {
859 /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
860 if (getpid() != 1
861 && (!ENABLE_FEATURE_INITRD || !strstr(applet_name, "linuxrc"))
862 ) {
863 bb_show_usage();
864 }
865 /* Set up sig handlers -- be sure to
866 * clear all of these in run() */
Denis Vlasenkod55268d2007-12-26 18:32:58 +0000867 signal(SIGHUP, exec_restart_action);
868 signal(SIGQUIT, exec_restart_action);
869 signal(SIGUSR1, halt_reboot_pwoff); /* halt */
870 signal(SIGUSR2, halt_reboot_pwoff); /* poweroff */
871 signal(SIGTERM, halt_reboot_pwoff); /* reboot */
Mike Frysingerbb50fdf2007-12-25 04:30:14 +0000872 signal(SIGINT, ctrlaltdel_signal);
Mike Frysingerbb50fdf2007-12-25 04:30:14 +0000873 signal(SIGCONT, cont_handler);
874 signal(SIGSTOP, stop_handler);
875 signal(SIGTSTP, stop_handler);
876
877 /* Turn off rebooting via CTL-ALT-DEL -- we get a
878 * SIGINT on CAD so we can shut things down gracefully... */
879 init_reboot(RB_DISABLE_CAD);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000880 }
Denis Vlasenkod8540f72007-06-14 07:53:06 +0000881
Eric Andersen599e3ce2002-07-03 11:08:10 +0000882 /* Figure out where the default console should be */
883 console_init();
Denis Vlasenkod238a472007-03-05 19:22:04 +0000884 set_sane_term();
Erik Andersen983b51b2000-04-04 18:14:25 +0000885 chdir("/");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000886 setsid();
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +0000887 {
Denis Vlasenko6ca409e2007-08-12 20:58:27 +0000888 const char *const *e;
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +0000889 /* Make sure environs is set to something sane */
Denis Vlasenkobf0a2012006-12-26 10:42:51 +0000890 for (e = environment; *e; e++)
Manuel Novoa III cad53642003-03-19 09:13:01 +0000891 putenv((char *) *e);
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +0000892 }
Rob Landleycba1b962006-07-09 17:28:17 +0000893
894 if (argc > 1) setenv("RUNLEVEL", argv[1], 1);
895
Erik Andersene49d5ec2000-02-08 19:58:47 +0000896 /* Hello world */
Denis Vlasenkoca525b42007-06-13 12:27:17 +0000897 message(MAYBE_CONSOLE | L_LOG, "init started: %s", bb_banner);
Eric Andersencc8ed391999-10-05 16:24:54 +0000898
Erik Andersene49d5ec2000-02-08 19:58:47 +0000899 /* Make sure there is enough memory to do something useful. */
Rob Landleyc3386a42005-08-30 18:50:37 +0000900 if (ENABLE_SWAPONOFF) {
901 struct sysinfo info;
902
903 if (!sysinfo(&info) &&
Denis Vlasenkodca0b702006-10-27 09:05:02 +0000904 (info.mem_unit ? : 1) * (long long)info.totalram < 1024*1024)
Rob Landleyc3386a42005-08-30 18:50:37 +0000905 {
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000906 message(L_CONSOLE, "Low memory, forcing swapon");
Rob Landleyc3386a42005-08-30 18:50:37 +0000907 /* swapon -a requires /proc typically */
Denis Vlasenko2f0c0d02007-01-21 00:41:04 +0000908 new_init_action(SYSINIT, "mount -t proc proc /proc", "");
Rob Landleyc3386a42005-08-30 18:50:37 +0000909 /* Try to turn on swap */
Denis Vlasenko2f0c0d02007-01-21 00:41:04 +0000910 new_init_action(SYSINIT, "swapon -a", "");
Rob Landleyc3386a42005-08-30 18:50:37 +0000911 run_actions(SYSINIT); /* wait and removing */
912 }
913 }
Erik Andersen9e737252000-01-06 01:16:13 +0000914
Erik Andersene49d5ec2000-02-08 19:58:47 +0000915 /* Check if we are supposed to be in single user mode */
Denis Vlasenkobf66fbc2006-12-21 13:23:14 +0000916 if (argc > 1
917 && (!strcmp(argv[1], "single") || !strcmp(argv[1], "-s") || LONE_CHAR(argv[1], '1'))
918 ) {
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +0000919 /* Start a shell on console */
Glenn L McGrathdc4e75e2003-09-02 02:36:18 +0000920 new_init_action(RESPAWN, bb_default_login_shell, "");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000921 } else {
922 /* Not in single user mode -- see what inittab says */
Eric Andersen8a8fbb81999-10-26 00:18:56 +0000923
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000924 /* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined,
Erik Andersene49d5ec2000-02-08 19:58:47 +0000925 * then parse_inittab() simply adds in some default
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000926 * actions(i.e., runs INIT_SCRIPT and then starts a pair
Erik Andersene49d5ec2000-02-08 19:58:47 +0000927 * of "askfirst" shells */
928 parse_inittab();
Eric Andersend00c2621999-12-07 08:37:31 +0000929 }
Erik Andersen983b51b2000-04-04 18:14:25 +0000930
Denis Vlasenko9b1381f2007-01-03 02:56:00 +0000931#if ENABLE_SELINUX
Rob Landleyb3ede5a2006-03-27 23:09:12 +0000932 if (getenv("SELINUX_INIT") == NULL) {
933 int enforce = 0;
934
Denis Vlasenkod8540f72007-06-14 07:53:06 +0000935 putenv((char*)"SELINUX_INIT=YES");
Rob Landleyb3ede5a2006-03-27 23:09:12 +0000936 if (selinux_init_load_policy(&enforce) == 0) {
Denis Vlasenko4921b542007-02-03 02:17:41 +0000937 BB_EXECVP(argv[0], argv);
Rob Landleyb3ede5a2006-03-27 23:09:12 +0000938 } else if (enforce > 0) {
939 /* SELinux in enforcing mode but load_policy failed */
Denis Vlasenkob7167542007-02-27 19:20:00 +0000940 message(L_CONSOLE, "Cannot load SELinux Policy. "
941 "Machine is in enforcing mode. Halting now.");
Rob Landleyb3ede5a2006-03-27 23:09:12 +0000942 exit(1);
943 }
944 }
945#endif /* CONFIG_SELINUX */
946
Denis Vlasenko2afabe82007-12-10 07:06:04 +0000947 /* Make the command line just say "init" - thats all, nothing else */
948 strncpy(argv[0], "init", strlen(argv[0]));
949 /* Wipe argv[1]-argv[N] so they don't clutter the ps listing */
950 while (*++argv)
951 memset(*argv, 0, strlen(*argv));
Eric Andersen219d6f51999-11-02 19:43:01 +0000952
Erik Andersene49d5ec2000-02-08 19:58:47 +0000953 /* Now run everything that needs to be run */
954
955 /* First run the sysinit command */
Eric Andersen1644db92001-09-05 20:18:15 +0000956 run_actions(SYSINIT);
Eric Andersen0298be82002-03-05 15:12:19 +0000957
Erik Andersene49d5ec2000-02-08 19:58:47 +0000958 /* Next run anything that wants to block */
Eric Andersen1644db92001-09-05 20:18:15 +0000959 run_actions(WAIT);
Eric Andersen0298be82002-03-05 15:12:19 +0000960
Erik Andersene49d5ec2000-02-08 19:58:47 +0000961 /* Next run anything to be run only once */
Eric Andersen0298be82002-03-05 15:12:19 +0000962 run_actions(ONCE);
963
Eric Andersen6fd0e312003-07-22 09:48:56 +0000964 /* Redefine SIGHUP to reread /etc/inittab */
Mike Frysingerbb50fdf2007-12-25 04:30:14 +0000965 if (ENABLE_FEATURE_USE_INITTAB)
966 signal(SIGHUP, reload_signal);
967 else
968 signal(SIGHUP, SIG_IGN);
Eric Andersen82baf632004-10-08 08:21:54 +0000969
Erik Andersene49d5ec2000-02-08 19:58:47 +0000970 /* Now run the looping stuff for the rest of forever */
971 while (1) {
Eric Andersen0298be82002-03-05 15:12:19 +0000972 /* run the respawn stuff */
973 run_actions(RESPAWN);
974
975 /* run the askfirst stuff */
976 run_actions(ASKFIRST);
977
978 /* Don't consume all CPU time -- sleep a bit */
979 sleep(1);
980
Denis Vlasenkofb0eba72008-01-02 19:55:04 +0000981 /* Wait for any child process to exit */
Bernhard Reutner-Fischerc58dbf22006-05-30 12:16:54 +0000982 wpid = wait(NULL);
Eric Andersen87812dc2004-04-12 19:21:54 +0000983 while (wpid > 0) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000984 /* Find out who died and clean up their corpse */
Eric Andersen0298be82002-03-05 15:12:19 +0000985 for (a = init_action_list; a; a = a->next) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000986 if (a->pid == wpid) {
Eric Andersen0298be82002-03-05 15:12:19 +0000987 /* Set the pid to 0 so that the process gets
988 * restarted by run_actions() */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000989 a->pid = 0;
Denis Vlasenko7a2ca5e2007-02-21 00:15:20 +0000990 message(L_LOG, "process '%s' (pid %d) exited. "
Glenn L McGrathb4a1baa2003-01-13 22:09:50 +0000991 "Scheduling it for restart.",
992 a->command, wpid);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000993 }
994 }
Eric Andersencf1fee02002-12-17 09:48:16 +0000995 /* see if anyone else is waiting to be reaped */
Denis Vlasenkofb0eba72008-01-02 19:55:04 +0000996 wpid = wait_any_nohang(NULL);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000997 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000998 }
Eric Andersencc8ed391999-10-05 16:24:54 +0000999}