Erik Andersen | ccc7488 | 2000-01-27 02:40:21 +0000 | [diff] [blame] | 1 | /* vi: set sw=4 ts=4: */ |
Eric Andersen | c499601 | 1999-10-20 22:08:37 +0000 | [diff] [blame] | 2 | /* |
| 3 | * Mini init implementation for busybox |
| 4 | * |
Eric Andersen | c499601 | 1999-10-20 22:08:37 +0000 | [diff] [blame] | 5 | * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>. |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 6 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> |
Eric Andersen | c499601 | 1999-10-20 22:08:37 +0000 | [diff] [blame] | 7 | * Adjusted by so many folks, it's impossible to keep track. |
| 8 | * |
Rob Landley | 2edf526 | 2006-01-22 02:41:51 +0000 | [diff] [blame] | 9 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
Eric Andersen | c499601 | 1999-10-20 22:08:37 +0000 | [diff] [blame] | 10 | */ |
| 11 | |
Denis Vlasenko | b6adbf1 | 2007-05-26 19:00:18 +0000 | [diff] [blame] | 12 | #include "libbb.h" |
Bernhard Reutner-Fischer | f470196 | 2008-01-27 12:50:12 +0000 | [diff] [blame] | 13 | #include <syslog.h> |
Eric Andersen | b186d98 | 1999-12-03 09:19:54 +0000 | [diff] [blame] | 14 | #include <paths.h> |
Eric Andersen | 85e5e72 | 2003-07-22 08:56:55 +0000 | [diff] [blame] | 15 | #include <sys/reboot.h> |
Denis Vlasenko | 6c62246 | 2009-01-29 02:01:04 +0000 | [diff] [blame] | 16 | #include <sys/resource.h> |
Denis Vlasenko | 5981ba5 | 2009-03-19 02:35:44 +0000 | [diff] [blame] | 17 | #include <linux/vt.h> |
Eric Andersen | 2c1de61 | 2003-04-24 11:41:28 +0000 | [diff] [blame] | 18 | |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 19 | |
Denis Vlasenko | 5cb54b5 | 2008-10-21 17:14:26 +0000 | [diff] [blame] | 20 | /* Was a CONFIG_xxx option. A lot of people were building |
| 21 | * not fully functional init by switching it on! */ |
| 22 | #define DEBUG_INIT 0 |
| 23 | |
Denis Vlasenko | 6c62246 | 2009-01-29 02:01:04 +0000 | [diff] [blame] | 24 | #define COMMAND_SIZE 256 |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 25 | #define CONSOLE_NAME_SIZE 32 |
Eric Andersen | bd22ed8 | 2000-07-08 18:55:24 +0000 | [diff] [blame] | 26 | |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 27 | /* Default sysinit script. */ |
Erik Andersen | 96e2abd | 2000-01-07 11:40:44 +0000 | [diff] [blame] | 28 | #ifndef INIT_SCRIPT |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 29 | #define INIT_SCRIPT "/etc/init.d/rcS" |
Erik Andersen | 96e2abd | 2000-01-07 11:40:44 +0000 | [diff] [blame] | 30 | #endif |
Erik Andersen | 9c88cac | 1999-12-30 09:25:17 +0000 | [diff] [blame] | 31 | |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 32 | /* Each type of actions can appear many times. They will be |
| 33 | * handled in order. RESTART is an exception, only 1st is used. |
| 34 | */ |
| 35 | /* Start these actions first and wait for completion */ |
Denis Vlasenko | ad4da98 | 2008-04-05 04:24:23 +0000 | [diff] [blame] | 36 | #define SYSINIT 0x01 |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 37 | /* Start these after SYSINIT and wait for completion */ |
| 38 | #define WAIT 0x02 |
| 39 | /* Start these after WAIT and *dont* wait for completion */ |
| 40 | #define ONCE 0x04 |
| 41 | /* |
| 42 | * NB: while SYSINIT/WAIT/ONCE are being processed, |
Denys Vlasenko | 6e54249 | 2009-11-15 03:07:19 +0100 | [diff] [blame] | 43 | * SIGHUP ("reread /etc/inittab") will be processed only after |
| 44 | * each group of actions. If new inittab adds, say, a SYSINIT action, |
| 45 | * it will not be run, since init is already "past SYSINIT stage". |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 46 | */ |
| 47 | /* Start these after ONCE are started, restart on exit */ |
| 48 | #define RESPAWN 0x08 |
| 49 | /* Like RESPAWN, but wait for <Enter> to be pressed on tty */ |
| 50 | #define ASKFIRST 0x10 |
| 51 | /* |
| 52 | * Start these on SIGINT, and wait for completion. |
| 53 | * Then go back to respawning RESPAWN and ASKFIRST actions. |
| 54 | * NB: kernel sends SIGINT to us if Ctrl-Alt-Del was pressed. |
| 55 | */ |
Denis Vlasenko | ad4da98 | 2008-04-05 04:24:23 +0000 | [diff] [blame] | 56 | #define CTRLALTDEL 0x20 |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 57 | /* |
| 58 | * Start these before killing all processes in preparation for |
| 59 | * running RESTART actions or doing low-level halt/reboot/poweroff |
| 60 | * (initiated by SIGUSR1/SIGTERM/SIGUSR2). |
| 61 | * Wait for completion before proceeding. |
| 62 | */ |
Denis Vlasenko | ad4da98 | 2008-04-05 04:24:23 +0000 | [diff] [blame] | 63 | #define SHUTDOWN 0x40 |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 64 | /* |
| 65 | * exec() on SIGQUIT. SHUTDOWN actions are started and waited for, |
| 66 | * then all processes are killed, then init exec's 1st RESTART action, |
| 67 | * replacing itself by it. If no RESTART action specified, |
| 68 | * SIGQUIT has no effect. |
| 69 | */ |
Denis Vlasenko | ad4da98 | 2008-04-05 04:24:23 +0000 | [diff] [blame] | 70 | #define RESTART 0x80 |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 71 | |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 72 | |
| 73 | /* A linked list of init_actions, to be read from inittab */ |
Eric Andersen | 0298be8 | 2002-03-05 15:12:19 +0000 | [diff] [blame] | 74 | struct init_action { |
Eric Andersen | 0298be8 | 2002-03-05 15:12:19 +0000 | [diff] [blame] | 75 | struct init_action *next; |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 76 | pid_t pid; |
Denis Vlasenko | a37e713 | 2008-02-19 02:57:07 +0000 | [diff] [blame] | 77 | uint8_t action_type; |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 78 | char terminal[CONSOLE_NAME_SIZE]; |
Denis Vlasenko | a37e713 | 2008-02-19 02:57:07 +0000 | [diff] [blame] | 79 | char command[COMMAND_SIZE]; |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 80 | }; |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 81 | |
Eric Andersen | 0298be8 | 2002-03-05 15:12:19 +0000 | [diff] [blame] | 82 | static struct init_action *init_action_list = NULL; |
Glenn L McGrath | baf55a8 | 2002-08-22 18:22:10 +0000 | [diff] [blame] | 83 | |
Denis Vlasenko | 4c97863 | 2007-02-03 03:31:13 +0000 | [diff] [blame] | 84 | static const char *log_console = VC_5; |
Rob Landley | bc68cd1 | 2006-03-10 19:22:06 +0000 | [diff] [blame] | 85 | |
| 86 | enum { |
Denis Vlasenko | ec27feb | 2007-02-17 15:52:02 +0000 | [diff] [blame] | 87 | L_LOG = 0x1, |
| 88 | L_CONSOLE = 0x2, |
Rob Landley | bc68cd1 | 2006-03-10 19:22:06 +0000 | [diff] [blame] | 89 | #ifndef RB_HALT_SYSTEM |
Bernhard Reutner-Fischer | cf1f2ac | 2006-06-02 10:43:17 +0000 | [diff] [blame] | 90 | RB_HALT_SYSTEM = 0xcdef0123, /* FIXME: this overflows enum */ |
Rob Landley | bc68cd1 | 2006-03-10 19:22:06 +0000 | [diff] [blame] | 91 | RB_ENABLE_CAD = 0x89abcdef, |
| 92 | RB_DISABLE_CAD = 0, |
| 93 | RB_POWER_OFF = 0x4321fedc, |
| 94 | RB_AUTOBOOT = 0x01234567, |
Eric Andersen | 0298be8 | 2002-03-05 15:12:19 +0000 | [diff] [blame] | 95 | #endif |
Rob Landley | bc68cd1 | 2006-03-10 19:22:06 +0000 | [diff] [blame] | 96 | }; |
Erik Andersen | 42094cd | 2000-03-20 21:34:52 +0000 | [diff] [blame] | 97 | |
Erik Andersen | 42094cd | 2000-03-20 21:34:52 +0000 | [diff] [blame] | 98 | /* Print a message to the specified device. |
Denis Vlasenko | 671ca33 | 2008-02-19 14:13:20 +0000 | [diff] [blame] | 99 | * "where" may be bitwise-or'd from L_LOG | L_CONSOLE |
| 100 | * NB: careful, we can be called after vfork! |
| 101 | */ |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 102 | #define dbg_message(...) do { if (DEBUG_INIT) message(__VA_ARGS__); } while (0) |
Denis Vlasenko | 671ca33 | 2008-02-19 14:13:20 +0000 | [diff] [blame] | 103 | static void message(int where, const char *fmt, ...) |
Glenn L McGrath | baf55a8 | 2002-08-22 18:22:10 +0000 | [diff] [blame] | 104 | __attribute__ ((format(printf, 2, 3))); |
Denis Vlasenko | 671ca33 | 2008-02-19 14:13:20 +0000 | [diff] [blame] | 105 | static void message(int where, const char *fmt, ...) |
Eric Andersen | 0460ff2 | 1999-10-25 23:32:44 +0000 | [diff] [blame] | 106 | { |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 107 | va_list arguments; |
Denis Vlasenko | b8d1a4c | 2008-09-20 16:28:59 +0000 | [diff] [blame] | 108 | unsigned l; |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 109 | char msg[128]; |
| 110 | |
Glenn L McGrath | b4a1baa | 2003-01-13 22:09:50 +0000 | [diff] [blame] | 111 | msg[0] = '\r'; |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 112 | va_start(arguments, fmt); |
Denis Vlasenko | 1bcdcd2 | 2008-12-09 21:23:31 +0000 | [diff] [blame] | 113 | l = 1 + vsnprintf(msg + 1, sizeof(msg) - 2, fmt, arguments); |
| 114 | if (l > sizeof(msg) - 1) |
| 115 | l = sizeof(msg) - 1; |
Denis Vlasenko | ec27feb | 2007-02-17 15:52:02 +0000 | [diff] [blame] | 116 | va_end(arguments); |
Glenn L McGrath | b4a1baa | 2003-01-13 22:09:50 +0000 | [diff] [blame] | 117 | |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 118 | #if ENABLE_FEATURE_INIT_SYSLOG |
| 119 | msg[l] = '\0'; |
| 120 | if (where & L_LOG) { |
| 121 | /* Log the message to syslogd */ |
| 122 | openlog("init", 0, LOG_DAEMON); |
| 123 | /* don't print "\r" */ |
| 124 | syslog(LOG_INFO, "%s", msg + 1); |
| 125 | closelog(); |
| 126 | } |
| 127 | msg[l++] = '\n'; |
| 128 | msg[l] = '\0'; |
| 129 | #else |
| 130 | { |
| 131 | static int log_fd = -1; |
| 132 | |
Mike Frysinger | bb50fdf | 2007-12-25 04:30:14 +0000 | [diff] [blame] | 133 | msg[l++] = '\n'; |
| 134 | msg[l] = '\0'; |
| 135 | /* Take full control of the log tty, and never close it. |
| 136 | * It's mine, all mine! Muhahahaha! */ |
| 137 | if (log_fd < 0) { |
| 138 | if (!log_console) { |
Bernhard Reutner-Fischer | ad2fa65 | 2008-07-21 11:16:39 +0000 | [diff] [blame] | 139 | log_fd = STDERR_FILENO; |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 140 | } else { |
Mike Frysinger | bb50fdf | 2007-12-25 04:30:14 +0000 | [diff] [blame] | 141 | log_fd = device_open(log_console, O_WRONLY | O_NONBLOCK | O_NOCTTY); |
| 142 | if (log_fd < 0) { |
| 143 | bb_error_msg("can't log to %s", log_console); |
Denis Vlasenko | 671ca33 | 2008-02-19 14:13:20 +0000 | [diff] [blame] | 144 | where = L_CONSOLE; |
Mike Frysinger | bb50fdf | 2007-12-25 04:30:14 +0000 | [diff] [blame] | 145 | } else { |
| 146 | close_on_exec_on(log_fd); |
| 147 | } |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 148 | } |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 149 | } |
Denis Vlasenko | 671ca33 | 2008-02-19 14:13:20 +0000 | [diff] [blame] | 150 | if (where & L_LOG) { |
Mike Frysinger | bb50fdf | 2007-12-25 04:30:14 +0000 | [diff] [blame] | 151 | full_write(log_fd, msg, l); |
Bernhard Reutner-Fischer | ad2fa65 | 2008-07-21 11:16:39 +0000 | [diff] [blame] | 152 | if (log_fd == STDERR_FILENO) |
Mike Frysinger | bb50fdf | 2007-12-25 04:30:14 +0000 | [diff] [blame] | 153 | return; /* don't print dup messages */ |
| 154 | } |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 155 | } |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 156 | #endif |
Eric Andersen | 4c78147 | 1999-11-26 08:12:56 +0000 | [diff] [blame] | 157 | |
Denis Vlasenko | 671ca33 | 2008-02-19 14:13:20 +0000 | [diff] [blame] | 158 | if (where & L_CONSOLE) { |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 159 | /* Send console messages to console so people will see them. */ |
Bernhard Reutner-Fischer | 5e25ddb | 2008-05-19 09:48:17 +0000 | [diff] [blame] | 160 | full_write(STDERR_FILENO, msg, l); |
Eric Andersen | 3ae0c78 | 1999-11-04 01:13:21 +0000 | [diff] [blame] | 161 | } |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 162 | } |
| 163 | |
Eric Andersen | 74400cc | 2001-10-18 04:11:39 +0000 | [diff] [blame] | 164 | static void console_init(void) |
Eric Andersen | 0460ff2 | 1999-10-25 23:32:44 +0000 | [diff] [blame] | 165 | { |
Denis Vlasenko | 5981ba5 | 2009-03-19 02:35:44 +0000 | [diff] [blame] | 166 | int vtno; |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 167 | char *s; |
Eric Andersen | 0460ff2 | 1999-10-25 23:32:44 +0000 | [diff] [blame] | 168 | |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 169 | s = getenv("CONSOLE"); |
Bernhard Reutner-Fischer | ad2fa65 | 2008-07-21 11:16:39 +0000 | [diff] [blame] | 170 | if (!s) |
| 171 | s = getenv("console"); |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 172 | if (s) { |
| 173 | int fd = open(s, O_RDWR | O_NONBLOCK | O_NOCTTY); |
| 174 | if (fd >= 0) { |
Bernhard Reutner-Fischer | ad2fa65 | 2008-07-21 11:16:39 +0000 | [diff] [blame] | 175 | dup2(fd, STDIN_FILENO); |
| 176 | dup2(fd, STDOUT_FILENO); |
| 177 | xmove_fd(fd, STDERR_FILENO); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 178 | } |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 179 | dbg_message(L_LOG, "console='%s'", s); |
Denis Vlasenko | d8540f7 | 2007-06-14 07:53:06 +0000 | [diff] [blame] | 180 | } else { |
Denis Vlasenko | fb274df | 2008-03-17 13:26:51 +0000 | [diff] [blame] | 181 | /* Make sure fd 0,1,2 are not closed |
| 182 | * (so that they won't be used by future opens) */ |
Denis Vlasenko | d48e81f | 2008-07-06 07:00:11 +0000 | [diff] [blame] | 183 | bb_sanitize_stdio(); |
Denis Vlasenko | a34b8a4 | 2008-11-29 23:14:37 +0000 | [diff] [blame] | 184 | // Users report problems |
| 185 | // /* Make sure init can't be blocked by writing to stderr */ |
| 186 | // fcntl(STDERR_FILENO, F_SETFL, fcntl(STDERR_FILENO, F_GETFL) | O_NONBLOCK); |
Eric Andersen | 07e5297 | 1999-11-07 07:38:08 +0000 | [diff] [blame] | 187 | } |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 188 | |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 189 | s = getenv("TERM"); |
Denis Vlasenko | 5981ba5 | 2009-03-19 02:35:44 +0000 | [diff] [blame] | 190 | if (ioctl(STDIN_FILENO, VT_OPENQRY, &vtno) != 0) { |
| 191 | /* Not a linux terminal, probably serial console. |
| 192 | * Force the TERM setting to vt102 |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 193 | * if TERM is set to linux (the default) */ |
| 194 | if (!s || strcmp(s, "linux") == 0) |
| 195 | putenv((char*)"TERM=vt102"); |
Mike Frysinger | bb50fdf | 2007-12-25 04:30:14 +0000 | [diff] [blame] | 196 | if (!ENABLE_FEATURE_INIT_SYSLOG) |
| 197 | log_console = NULL; |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 198 | } else if (!s) |
| 199 | putenv((char*)"TERM=linux"); |
Eric Andersen | 0460ff2 | 1999-10-25 23:32:44 +0000 | [diff] [blame] | 200 | } |
Glenn L McGrath | baf55a8 | 2002-08-22 18:22:10 +0000 | [diff] [blame] | 201 | |
Denis Vlasenko | 671ca33 | 2008-02-19 14:13:20 +0000 | [diff] [blame] | 202 | /* Set terminal settings to reasonable defaults. |
| 203 | * NB: careful, we can be called after vfork! */ |
Denis Vlasenko | 2afabe8 | 2007-12-10 07:06:04 +0000 | [diff] [blame] | 204 | static void set_sane_term(void) |
Eric Andersen | 7ef1a5b | 2001-03-20 17:39:08 +0000 | [diff] [blame] | 205 | { |
Denis Vlasenko | 2afabe8 | 2007-12-10 07:06:04 +0000 | [diff] [blame] | 206 | struct termios tty; |
Eric Andersen | 7ef1a5b | 2001-03-20 17:39:08 +0000 | [diff] [blame] | 207 | |
Denis Vlasenko | 2afabe8 | 2007-12-10 07:06:04 +0000 | [diff] [blame] | 208 | tcgetattr(STDIN_FILENO, &tty); |
| 209 | |
| 210 | /* set control chars */ |
| 211 | 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 */ |
| 216 | tty.c_cc[VSTART] = 17; /* C-q */ |
| 217 | tty.c_cc[VSTOP] = 19; /* C-s */ |
| 218 | tty.c_cc[VSUSP] = 26; /* C-z */ |
| 219 | |
Bernhard Reutner-Fischer | ad2fa65 | 2008-07-21 11:16:39 +0000 | [diff] [blame] | 220 | /* use line discipline 0 */ |
Denis Vlasenko | 2afabe8 | 2007-12-10 07:06:04 +0000 | [diff] [blame] | 221 | tty.c_line = 0; |
| 222 | |
| 223 | /* Make it be sane */ |
| 224 | tty.c_cflag &= CBAUD | CBAUDEX | CSIZE | CSTOPB | PARENB | PARODD; |
| 225 | tty.c_cflag |= CREAD | HUPCL | CLOCAL; |
| 226 | |
| 227 | /* input modes */ |
| 228 | tty.c_iflag = ICRNL | IXON | IXOFF; |
| 229 | |
| 230 | /* output modes */ |
| 231 | tty.c_oflag = OPOST | ONLCR; |
| 232 | |
| 233 | /* local modes */ |
| 234 | tty.c_lflag = |
| 235 | ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN; |
| 236 | |
Denis Vlasenko | 202ac50 | 2008-11-05 13:20:58 +0000 | [diff] [blame] | 237 | tcsetattr_stdin_TCSANOW(&tty); |
Eric Andersen | 7ef1a5b | 2001-03-20 17:39:08 +0000 | [diff] [blame] | 238 | } |
| 239 | |
Denis Vlasenko | 671ca33 | 2008-02-19 14:13:20 +0000 | [diff] [blame] | 240 | /* Open the new terminal device. |
| 241 | * NB: careful, we can be called after vfork! */ |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 242 | static int open_stdio_to_tty(const char* tty_name) |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 243 | { |
| 244 | /* empty tty_name means "use init's tty", else... */ |
| 245 | if (tty_name[0]) { |
Denis Vlasenko | d55268d | 2007-12-26 18:32:58 +0000 | [diff] [blame] | 246 | int fd; |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 247 | |
Bernhard Reutner-Fischer | ad2fa65 | 2008-07-21 11:16:39 +0000 | [diff] [blame] | 248 | close(STDIN_FILENO); |
Denis Vlasenko | d55268d | 2007-12-26 18:32:58 +0000 | [diff] [blame] | 249 | /* fd can be only < 0 or 0: */ |
| 250 | fd = device_open(tty_name, O_RDWR); |
| 251 | if (fd) { |
Bernhard Reutner-Fischer | a53de7f | 2008-07-21 13:46:54 +0000 | [diff] [blame] | 252 | message(L_LOG | L_CONSOLE, "can't open %s: %s", |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 253 | tty_name, strerror(errno)); |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 254 | return 0; /* failure */ |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 255 | } |
Bernhard Reutner-Fischer | ad2fa65 | 2008-07-21 11:16:39 +0000 | [diff] [blame] | 256 | dup2(STDIN_FILENO, STDOUT_FILENO); |
| 257 | dup2(STDIN_FILENO, STDERR_FILENO); |
Bernhard Reutner-Fischer | 0da069d | 2006-05-29 12:54:16 +0000 | [diff] [blame] | 258 | } |
Denis Vlasenko | d238a47 | 2007-03-05 19:22:04 +0000 | [diff] [blame] | 259 | set_sane_term(); |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 260 | return 1; /* success */ |
Bernhard Reutner-Fischer | 0da069d | 2006-05-29 12:54:16 +0000 | [diff] [blame] | 261 | } |
| 262 | |
Denys Vlasenko | bcc6ec9 | 2009-12-14 03:03:29 +0100 | [diff] [blame^] | 263 | static void reset_sighandlers_and_unblock_sigs(void) |
| 264 | { |
| 265 | bb_signals(0 |
| 266 | + (1 << SIGUSR1) |
| 267 | + (1 << SIGUSR2) |
| 268 | + (1 << SIGTERM) |
| 269 | + (1 << SIGQUIT) |
| 270 | + (1 << SIGINT) |
| 271 | + (1 << SIGHUP) |
| 272 | + (1 << SIGTSTP) |
| 273 | , SIG_DFL); |
| 274 | sigprocmask_allsigs(SIG_UNBLOCK); |
| 275 | } |
| 276 | |
Denis Vlasenko | 671ca33 | 2008-02-19 14:13:20 +0000 | [diff] [blame] | 277 | /* Wrapper around exec: |
| 278 | * Takes string (max COMMAND_SIZE chars). |
| 279 | * If chars like '>' detected, execs '[-]/bin/sh -c "exec ......."'. |
| 280 | * Otherwise splits words on whitespace, deals with leading dash, |
| 281 | * and uses plain exec(). |
| 282 | * NB: careful, we can be called after vfork! |
Denis Vlasenko | a37e713 | 2008-02-19 02:57:07 +0000 | [diff] [blame] | 283 | */ |
| 284 | static void init_exec(const char *command) |
| 285 | { |
| 286 | char *cmd[COMMAND_SIZE / 2]; |
| 287 | char buf[COMMAND_SIZE + 6]; /* COMMAND_SIZE+strlen("exec ")+1 */ |
Denis Vlasenko | 671ca33 | 2008-02-19 14:13:20 +0000 | [diff] [blame] | 288 | int dash = (command[0] == '-' /* maybe? && command[1] == '/' */); |
Denis Vlasenko | a37e713 | 2008-02-19 02:57:07 +0000 | [diff] [blame] | 289 | |
| 290 | /* See if any special /bin/sh requiring characters are present */ |
| 291 | if (strpbrk(command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) { |
| 292 | strcpy(buf, "exec "); |
| 293 | strcpy(buf + 5, command + dash); /* excluding "-" */ |
Denis Vlasenko | 671ca33 | 2008-02-19 14:13:20 +0000 | [diff] [blame] | 294 | /* NB: LIBBB_DEFAULT_LOGIN_SHELL define has leading dash */ |
Denis Vlasenko | a37e713 | 2008-02-19 02:57:07 +0000 | [diff] [blame] | 295 | cmd[0] = (char*)(LIBBB_DEFAULT_LOGIN_SHELL + !dash); |
| 296 | cmd[1] = (char*)"-c"; |
| 297 | cmd[2] = buf; |
| 298 | cmd[3] = NULL; |
| 299 | } else { |
| 300 | /* Convert command (char*) into cmd (char**, one word per string) */ |
| 301 | char *word, *next; |
| 302 | int i = 0; |
| 303 | next = strcpy(buf, command); /* including "-" */ |
| 304 | while ((word = strsep(&next, " \t")) != NULL) { |
| 305 | if (*word != '\0') { /* not two spaces/tabs together? */ |
| 306 | cmd[i] = word; |
| 307 | i++; |
| 308 | } |
| 309 | } |
| 310 | cmd[i] = NULL; |
| 311 | } |
| 312 | /* If we saw leading "-", it is interactive shell. |
| 313 | * Try harder to give it a controlling tty. |
| 314 | * And skip "-" in actual exec call. */ |
| 315 | if (dash) { |
| 316 | /* _Attempt_ to make stdin a controlling tty. */ |
| 317 | if (ENABLE_FEATURE_INIT_SCTTY) |
| 318 | ioctl(STDIN_FILENO, TIOCSCTTY, 0 /*only try, don't steal*/); |
| 319 | } |
| 320 | BB_EXECVP(cmd[0] + dash, cmd); |
Denys Vlasenko | 6331cf0 | 2009-11-13 09:08:27 +0100 | [diff] [blame] | 321 | message(L_LOG | L_CONSOLE, "can't run '%s': %s", cmd[0], strerror(errno)); |
Denis Vlasenko | a37e713 | 2008-02-19 02:57:07 +0000 | [diff] [blame] | 322 | /* returns if execvp fails */ |
| 323 | } |
| 324 | |
Denis Vlasenko | 2afabe8 | 2007-12-10 07:06:04 +0000 | [diff] [blame] | 325 | /* Used only by run_actions */ |
Glenn L McGrath | b4a1baa | 2003-01-13 22:09:50 +0000 | [diff] [blame] | 326 | static pid_t run(const struct init_action *a) |
Eric Andersen | 0298be8 | 2002-03-05 15:12:19 +0000 | [diff] [blame] | 327 | { |
Mike Frysinger | 10427ab | 2005-07-06 05:00:48 +0000 | [diff] [blame] | 328 | pid_t pid; |
Erik Andersen | ac6e71f | 2000-01-08 22:04:33 +0000 | [diff] [blame] | 329 | |
Denis Vlasenko | 4774179 | 2009-03-10 16:01:57 +0000 | [diff] [blame] | 330 | /* Careful: don't be affected by a signal in vforked child */ |
| 331 | sigprocmask_allsigs(SIG_BLOCK); |
Denis Vlasenko | ad4da98 | 2008-04-05 04:24:23 +0000 | [diff] [blame] | 332 | if (BB_MMU && (a->action_type & ASKFIRST)) |
| 333 | pid = fork(); |
| 334 | else |
| 335 | pid = vfork(); |
Denis Vlasenko | 2afabe8 | 2007-12-10 07:06:04 +0000 | [diff] [blame] | 336 | if (pid < 0) |
Bernhard Reutner-Fischer | a53de7f | 2008-07-21 13:46:54 +0000 | [diff] [blame] | 337 | message(L_LOG | L_CONSOLE, "can't fork"); |
Denis Vlasenko | 4774179 | 2009-03-10 16:01:57 +0000 | [diff] [blame] | 338 | if (pid) { |
| 339 | sigprocmask_allsigs(SIG_UNBLOCK); |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 340 | return pid; /* Parent or error */ |
Denis Vlasenko | 4774179 | 2009-03-10 16:01:57 +0000 | [diff] [blame] | 341 | } |
Eric Andersen | 0298be8 | 2002-03-05 15:12:19 +0000 | [diff] [blame] | 342 | |
Denis Vlasenko | 2afabe8 | 2007-12-10 07:06:04 +0000 | [diff] [blame] | 343 | /* Child */ |
| 344 | |
Denis Vlasenko | 966bb43 | 2007-02-27 19:20:33 +0000 | [diff] [blame] | 345 | /* Reset signal handlers that were set by the parent process */ |
Denys Vlasenko | bcc6ec9 | 2009-12-14 03:03:29 +0100 | [diff] [blame^] | 346 | reset_sighandlers_and_unblock_sigs(); |
Eric Andersen | 2f6c04f | 1999-11-01 23:59:44 +0000 | [diff] [blame] | 347 | |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 348 | /* Create a new session and make ourself the process group leader */ |
Denis Vlasenko | 966bb43 | 2007-02-27 19:20:33 +0000 | [diff] [blame] | 349 | setsid(); |
Eric Andersen | 599e3ce | 2002-07-03 11:08:10 +0000 | [diff] [blame] | 350 | |
Denis Vlasenko | 966bb43 | 2007-02-27 19:20:33 +0000 | [diff] [blame] | 351 | /* Open the new terminal device */ |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 352 | if (!open_stdio_to_tty(a->terminal)) |
| 353 | _exit(EXIT_FAILURE); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 354 | |
Denis Vlasenko | ad4da98 | 2008-04-05 04:24:23 +0000 | [diff] [blame] | 355 | /* NB: on NOMMU we can't wait for input in child, so |
| 356 | * "askfirst" will work the same as "respawn". */ |
Denis Vlasenko | 671ca33 | 2008-02-19 14:13:20 +0000 | [diff] [blame] | 357 | if (BB_MMU && (a->action_type & ASKFIRST)) { |
Denis Vlasenko | 6ca409e | 2007-08-12 20:58:27 +0000 | [diff] [blame] | 358 | static const char press_enter[] ALIGN1 = |
Denis Vlasenko | 966bb43 | 2007-02-27 19:20:33 +0000 | [diff] [blame] | 359 | #ifdef CUSTOMIZED_BANNER |
| 360 | #include CUSTOMIZED_BANNER |
Eric Andersen | 1f50e84 | 2004-08-16 09:29:42 +0000 | [diff] [blame] | 361 | #endif |
Denis Vlasenko | 966bb43 | 2007-02-27 19:20:33 +0000 | [diff] [blame] | 362 | "\nPlease press Enter to activate this console. "; |
| 363 | char c; |
| 364 | /* |
| 365 | * Save memory by not exec-ing anything large (like a shell) |
| 366 | * before the user wants it. This is critical if swap is not |
| 367 | * enabled and the system has low memory. Generally this will |
| 368 | * be run on the second virtual console, and the first will |
| 369 | * be allowed to start a shell or whatever an init script |
| 370 | * specifies. |
| 371 | */ |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 372 | dbg_message(L_LOG, "waiting for enter to start '%s'" |
Denis Vlasenko | 966bb43 | 2007-02-27 19:20:33 +0000 | [diff] [blame] | 373 | "(pid %d, tty '%s')\n", |
Denis Vlasenko | a37e713 | 2008-02-19 02:57:07 +0000 | [diff] [blame] | 374 | a->command, getpid(), a->terminal); |
Bernhard Reutner-Fischer | 5e25ddb | 2008-05-19 09:48:17 +0000 | [diff] [blame] | 375 | full_write(STDOUT_FILENO, press_enter, sizeof(press_enter) - 1); |
| 376 | while (safe_read(STDIN_FILENO, &c, 1) == 1 && c != '\n') |
Denis Vlasenko | 2afabe8 | 2007-12-10 07:06:04 +0000 | [diff] [blame] | 377 | continue; |
Denis Vlasenko | 966bb43 | 2007-02-27 19:20:33 +0000 | [diff] [blame] | 378 | } |
Denis Vlasenko | 2afabe8 | 2007-12-10 07:06:04 +0000 | [diff] [blame] | 379 | |
Denis Vlasenko | 6c62246 | 2009-01-29 02:01:04 +0000 | [diff] [blame] | 380 | /* |
| 381 | * When a file named /.init_enable_core exists, setrlimit is called |
| 382 | * before processes are spawned to set core file size as unlimited. |
| 383 | * This is for debugging only. Don't use this is production, unless |
| 384 | * you want core dumps lying about.... |
| 385 | */ |
Mike Frysinger | bb50fdf | 2007-12-25 04:30:14 +0000 | [diff] [blame] | 386 | if (ENABLE_FEATURE_INIT_COREDUMPS) { |
Denis Vlasenko | 6c62246 | 2009-01-29 02:01:04 +0000 | [diff] [blame] | 387 | if (access("/.init_enable_core", F_OK) == 0) { |
Denis Vlasenko | 966bb43 | 2007-02-27 19:20:33 +0000 | [diff] [blame] | 388 | struct rlimit limit; |
Denis Vlasenko | 966bb43 | 2007-02-27 19:20:33 +0000 | [diff] [blame] | 389 | limit.rlim_cur = RLIM_INFINITY; |
| 390 | limit.rlim_max = RLIM_INFINITY; |
| 391 | setrlimit(RLIMIT_CORE, &limit); |
Erik Andersen | 983b51b | 2000-04-04 18:14:25 +0000 | [diff] [blame] | 392 | } |
Erik Andersen | 05df239 | 2000-01-13 04:43:48 +0000 | [diff] [blame] | 393 | } |
Mike Frysinger | bb50fdf | 2007-12-25 04:30:14 +0000 | [diff] [blame] | 394 | |
Denis Vlasenko | a37e713 | 2008-02-19 02:57:07 +0000 | [diff] [blame] | 395 | /* Log the process name and args */ |
| 396 | message(L_LOG, "starting pid %d, tty '%s': '%s'", |
| 397 | getpid(), a->terminal, a->command); |
| 398 | |
Denis Vlasenko | 966bb43 | 2007-02-27 19:20:33 +0000 | [diff] [blame] | 399 | /* Now run it. The new program will take over this PID, |
| 400 | * so nothing further in init.c should be run. */ |
Denis Vlasenko | a37e713 | 2008-02-19 02:57:07 +0000 | [diff] [blame] | 401 | init_exec(a->command); |
Denis Vlasenko | 966bb43 | 2007-02-27 19:20:33 +0000 | [diff] [blame] | 402 | /* We're still here? Some error happened. */ |
Denis Vlasenko | 966bb43 | 2007-02-27 19:20:33 +0000 | [diff] [blame] | 403 | _exit(-1); |
Eric Andersen | 0460ff2 | 1999-10-25 23:32:44 +0000 | [diff] [blame] | 404 | } |
| 405 | |
Denis Vlasenko | 9ec0ecb | 2009-01-31 19:26:12 +0000 | [diff] [blame] | 406 | static struct init_action *mark_terminated(pid_t pid) |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 407 | { |
| 408 | struct init_action *a; |
| 409 | |
Denis Vlasenko | 9ec0ecb | 2009-01-31 19:26:12 +0000 | [diff] [blame] | 410 | if (pid > 0) { |
| 411 | for (a = init_action_list; a; a = a->next) { |
| 412 | if (a->pid == pid) { |
| 413 | a->pid = 0; |
| 414 | return a; |
| 415 | } |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 416 | } |
| 417 | } |
| 418 | return NULL; |
| 419 | } |
| 420 | |
Denis Vlasenko | cab28aa | 2009-01-31 01:02:07 +0000 | [diff] [blame] | 421 | static void waitfor(pid_t pid) |
| 422 | { |
| 423 | /* waitfor(run(x)): protect against failed fork inside run() */ |
| 424 | if (pid <= 0) |
| 425 | return; |
| 426 | |
| 427 | /* Wait for any child (prevent zombies from exiting orphaned processes) |
| 428 | * but exit the loop only when specified one has exited. */ |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 429 | while (1) { |
| 430 | pid_t wpid = wait(NULL); |
| 431 | mark_terminated(wpid); |
| 432 | /* Unsafe. SIGTSTP handler might have wait'ed it already */ |
| 433 | /*if (wpid == pid) break;*/ |
Denis Vlasenko | 9ec0ecb | 2009-01-31 19:26:12 +0000 | [diff] [blame] | 434 | /* More reliable: */ |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 435 | if (kill(pid, 0)) |
| 436 | break; |
| 437 | } |
Denis Vlasenko | cab28aa | 2009-01-31 01:02:07 +0000 | [diff] [blame] | 438 | } |
| 439 | |
Eric Andersen | 0298be8 | 2002-03-05 15:12:19 +0000 | [diff] [blame] | 440 | /* Run all commands of a particular type */ |
Denis Vlasenko | a37e713 | 2008-02-19 02:57:07 +0000 | [diff] [blame] | 441 | static void run_actions(int action_type) |
Eric Andersen | 219d6f5 | 1999-11-02 19:43:01 +0000 | [diff] [blame] | 442 | { |
Denis Vlasenko | a37e713 | 2008-02-19 02:57:07 +0000 | [diff] [blame] | 443 | struct init_action *a; |
Glenn L McGrath | baf55a8 | 2002-08-22 18:22:10 +0000 | [diff] [blame] | 444 | |
Denis Vlasenko | a37e713 | 2008-02-19 02:57:07 +0000 | [diff] [blame] | 445 | for (a = init_action_list; a; a = a->next) { |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 446 | if (!(a->action_type & action_type)) |
| 447 | continue; |
Eric Andersen | 5222d31 | 2002-07-03 05:15:23 +0000 | [diff] [blame] | 448 | |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 449 | if (a->action_type & (SYSINIT | WAIT | ONCE | CTRLALTDEL | SHUTDOWN)) { |
| 450 | pid_t pid = run(a); |
| 451 | if (a->action_type & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN)) |
| 452 | waitfor(pid); |
| 453 | } |
| 454 | if (a->action_type & (RESPAWN | ASKFIRST)) { |
| 455 | /* Only run stuff with pid == 0. If pid != 0, |
| 456 | * it is already running |
| 457 | */ |
| 458 | if (a->pid == 0) |
| 459 | a->pid = run(a); |
Eric Andersen | 730f826 | 2001-12-17 23:13:08 +0000 | [diff] [blame] | 460 | } |
| 461 | } |
| 462 | } |
| 463 | |
Denis Vlasenko | a37e713 | 2008-02-19 02:57:07 +0000 | [diff] [blame] | 464 | static void new_init_action(uint8_t action_type, const char *command, const char *cons) |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 465 | { |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 466 | struct init_action *a, **nextp; |
Erik Andersen | 9e73725 | 2000-01-06 01:16:13 +0000 | [diff] [blame] | 467 | |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 468 | /* Scenario: |
| 469 | * old inittab: |
| 470 | * ::shutdown:umount -a -r |
| 471 | * ::shutdown:swapoff -a |
| 472 | * new inittab: |
| 473 | * ::shutdown:swapoff -a |
| 474 | * ::shutdown:umount -a -r |
| 475 | * On reload, we must ensure entries end up in correct order. |
| 476 | * To achieve that, if we find a matching entry, we move it |
| 477 | * to the end. |
| 478 | */ |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 479 | nextp = &init_action_list; |
| 480 | while ((a = *nextp) != NULL) { |
| 481 | /* Don't enter action if it's already in the list, |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 482 | * This prevents losing running RESPAWNs. |
| 483 | */ |
Denis Vlasenko | ec27feb | 2007-02-17 15:52:02 +0000 | [diff] [blame] | 484 | if ((strcmp(a->command, command) == 0) |
Denis Vlasenko | b74a2db | 2008-07-21 21:34:51 +0000 | [diff] [blame] | 485 | && (strcmp(a->terminal, cons) == 0) |
| 486 | ) { |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 487 | /* Remove from list */ |
| 488 | *nextp = a->next; |
| 489 | /* Find the end of the list */ |
| 490 | while (*nextp != NULL) |
| 491 | nextp = &(*nextp)->next; |
| 492 | a->next = NULL; |
| 493 | break; |
Eric Andersen | 6fd0e31 | 2003-07-22 09:48:56 +0000 | [diff] [blame] | 494 | } |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 495 | nextp = &a->next; |
Eric Andersen | 6fd0e31 | 2003-07-22 09:48:56 +0000 | [diff] [blame] | 496 | } |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 497 | |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 498 | if (!a) |
| 499 | a = xzalloc(sizeof(*a)); |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 500 | /* Append to the end of the list */ |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 501 | *nextp = a; |
Denis Vlasenko | a37e713 | 2008-02-19 02:57:07 +0000 | [diff] [blame] | 502 | a->action_type = action_type; |
| 503 | safe_strncpy(a->command, command, sizeof(a->command)); |
| 504 | safe_strncpy(a->terminal, cons, sizeof(a->terminal)); |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 505 | dbg_message(L_LOG | L_CONSOLE, "command='%s' action=%d tty='%s'\n", |
Denis Vlasenko | a37e713 | 2008-02-19 02:57:07 +0000 | [diff] [blame] | 506 | a->command, a->action_type, a->terminal); |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 507 | } |
| 508 | |
Eric Andersen | bdfd0d7 | 2001-10-24 05:00:29 +0000 | [diff] [blame] | 509 | /* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined, |
Erik Andersen | 9e73725 | 2000-01-06 01:16:13 +0000 | [diff] [blame] | 510 | * then parse_inittab() simply adds in some default |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 511 | * actions(i.e., runs INIT_SCRIPT and then starts a pair |
| 512 | * of "askfirst" shells). If CONFIG_FEATURE_USE_INITTAB |
| 513 | * _is_ defined, but /etc/inittab is missing, this |
Erik Andersen | 812d466 | 2000-01-07 18:30:40 +0000 | [diff] [blame] | 514 | * results in the same set of default behaviors. |
Glenn L McGrath | baf55a8 | 2002-08-22 18:22:10 +0000 | [diff] [blame] | 515 | */ |
Eric Andersen | 3e6ff90 | 2001-03-09 21:24:12 +0000 | [diff] [blame] | 516 | static void parse_inittab(void) |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 517 | { |
Denis Vlasenko | 6c62246 | 2009-01-29 02:01:04 +0000 | [diff] [blame] | 518 | #if ENABLE_FEATURE_USE_INITTAB |
Bernhard Reutner-Fischer | 54d50a0 | 2008-07-17 14:00:42 +0000 | [diff] [blame] | 519 | char *token[4]; |
Denis Vlasenko | 6c62246 | 2009-01-29 02:01:04 +0000 | [diff] [blame] | 520 | parser_t *parser = config_open2("/etc/inittab", fopen_for_read); |
Bernhard Reutner-Fischer | 54d50a0 | 2008-07-17 14:00:42 +0000 | [diff] [blame] | 521 | |
Denis Vlasenko | 6c62246 | 2009-01-29 02:01:04 +0000 | [diff] [blame] | 522 | if (parser == NULL) |
| 523 | #endif |
| 524 | { |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 525 | /* No inittab file - set up some default behavior */ |
Bernhard Reutner-Fischer | 54d50a0 | 2008-07-17 14:00:42 +0000 | [diff] [blame] | 526 | /* Reboot on Ctrl-Alt-Del */ |
| 527 | new_init_action(CTRLALTDEL, "reboot", ""); |
| 528 | /* Umount all filesystems on halt/reboot */ |
| 529 | new_init_action(SHUTDOWN, "umount -a -r", ""); |
| 530 | /* Swapoff on halt/reboot */ |
| 531 | if (ENABLE_SWAPONOFF) |
| 532 | new_init_action(SHUTDOWN, "swapoff -a", ""); |
| 533 | /* Prepare to restart init when a QUIT is received */ |
| 534 | new_init_action(RESTART, "init", ""); |
| 535 | /* Askfirst shell on tty1-4 */ |
| 536 | new_init_action(ASKFIRST, bb_default_login_shell, ""); |
Denis Vlasenko | a474b68 | 2008-07-17 17:58:44 +0000 | [diff] [blame] | 537 | //TODO: VC_1 instead of ""? "" is console -> ctty problems -> angry users |
Bernhard Reutner-Fischer | 54d50a0 | 2008-07-17 14:00:42 +0000 | [diff] [blame] | 538 | new_init_action(ASKFIRST, bb_default_login_shell, VC_2); |
| 539 | new_init_action(ASKFIRST, bb_default_login_shell, VC_3); |
| 540 | new_init_action(ASKFIRST, bb_default_login_shell, VC_4); |
| 541 | /* sysinit */ |
| 542 | new_init_action(SYSINIT, INIT_SCRIPT, ""); |
Bernhard Reutner-Fischer | 54d50a0 | 2008-07-17 14:00:42 +0000 | [diff] [blame] | 543 | return; |
| 544 | } |
Denis Vlasenko | 6c62246 | 2009-01-29 02:01:04 +0000 | [diff] [blame] | 545 | |
| 546 | #if ENABLE_FEATURE_USE_INITTAB |
Bernhard Reutner-Fischer | 54d50a0 | 2008-07-17 14:00:42 +0000 | [diff] [blame] | 547 | /* optional_tty:ignored_runlevel:action:command |
Denis Vlasenko | a474b68 | 2008-07-17 17:58:44 +0000 | [diff] [blame] | 548 | * Delims are not to be collapsed and need exactly 4 tokens |
Bernhard Reutner-Fischer | 54d50a0 | 2008-07-17 14:00:42 +0000 | [diff] [blame] | 549 | */ |
Denis Vlasenko | 084266e | 2008-07-26 23:08:31 +0000 | [diff] [blame] | 550 | while (config_read(parser, token, 4, 0, "#:", |
| 551 | PARSE_NORMAL & ~(PARSE_TRIM | PARSE_COLLAPSE))) { |
Denis Vlasenko | 6c62246 | 2009-01-29 02:01:04 +0000 | [diff] [blame] | 552 | /* order must correspond to SYSINIT..RESTART constants */ |
| 553 | static const char actions[] ALIGN1 = |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 554 | "sysinit\0""wait\0""once\0""respawn\0""askfirst\0" |
Denis Vlasenko | 6c62246 | 2009-01-29 02:01:04 +0000 | [diff] [blame] | 555 | "ctrlaltdel\0""shutdown\0""restart\0"; |
Denis Vlasenko | a474b68 | 2008-07-17 17:58:44 +0000 | [diff] [blame] | 556 | int action; |
Bernhard Reutner-Fischer | 54d50a0 | 2008-07-17 14:00:42 +0000 | [diff] [blame] | 557 | char *tty = token[0]; |
Bernhard Reutner-Fischer | 54d50a0 | 2008-07-17 14:00:42 +0000 | [diff] [blame] | 558 | |
Denis Vlasenko | a474b68 | 2008-07-17 17:58:44 +0000 | [diff] [blame] | 559 | if (!token[3]) /* less than 4 tokens */ |
Bernhard Reutner-Fischer | 54d50a0 | 2008-07-17 14:00:42 +0000 | [diff] [blame] | 560 | goto bad_entry; |
Denis Vlasenko | a474b68 | 2008-07-17 17:58:44 +0000 | [diff] [blame] | 561 | action = index_in_strings(actions, token[2]); |
| 562 | if (action < 0 || !token[3][0]) /* token[3]: command */ |
| 563 | goto bad_entry; |
| 564 | /* turn .*TTY -> /dev/TTY */ |
| 565 | if (tty[0]) { |
| 566 | if (strncmp(tty, "/dev/", 5) == 0) |
Bernhard Reutner-Fischer | 54d50a0 | 2008-07-17 14:00:42 +0000 | [diff] [blame] | 567 | tty += 5; |
| 568 | tty = concat_path_file("/dev/", tty); |
Denis Vlasenko | a474b68 | 2008-07-17 17:58:44 +0000 | [diff] [blame] | 569 | } |
| 570 | new_init_action(1 << action, token[3], tty); |
| 571 | if (tty[0]) |
Bernhard Reutner-Fischer | 54d50a0 | 2008-07-17 14:00:42 +0000 | [diff] [blame] | 572 | free(tty); |
| 573 | continue; |
| 574 | bad_entry: |
Bernhard Reutner-Fischer | ad2fa65 | 2008-07-21 11:16:39 +0000 | [diff] [blame] | 575 | message(L_LOG | L_CONSOLE, "Bad inittab entry at line %d", |
| 576 | parser->lineno); |
Bernhard Reutner-Fischer | 54d50a0 | 2008-07-17 14:00:42 +0000 | [diff] [blame] | 577 | } |
| 578 | config_close(parser); |
Denis Vlasenko | 6c62246 | 2009-01-29 02:01:04 +0000 | [diff] [blame] | 579 | #endif |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 580 | } |
| 581 | |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 582 | static void pause_and_low_level_reboot(unsigned magic) NORETURN; |
| 583 | static void pause_and_low_level_reboot(unsigned magic) |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 584 | { |
| 585 | pid_t pid; |
| 586 | |
| 587 | /* Allow time for last message to reach serial console, etc */ |
| 588 | sleep(1); |
| 589 | |
| 590 | /* We have to fork here, since the kernel calls do_exit(EXIT_SUCCESS) |
| 591 | * in linux/kernel/sys.c, which can cause the machine to panic when |
| 592 | * the init process exits... */ |
| 593 | pid = vfork(); |
| 594 | if (pid == 0) { /* child */ |
| 595 | reboot(magic); |
| 596 | _exit(EXIT_SUCCESS); |
| 597 | } |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 598 | while (1) |
| 599 | sleep(1); |
| 600 | } |
| 601 | |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 602 | static void run_shutdown_and_kill_processes(void) |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 603 | { |
| 604 | /* Run everything to be run at "shutdown". This is done _prior_ |
| 605 | * to killing everything, in case people wish to use scripts to |
| 606 | * shut things down gracefully... */ |
| 607 | run_actions(SHUTDOWN); |
| 608 | |
| 609 | message(L_CONSOLE | L_LOG, "The system is going down NOW!"); |
| 610 | |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 611 | /* Send signals to every process _except_ pid 1 */ |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 612 | kill(-1, SIGTERM); |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 613 | message(L_CONSOLE | L_LOG, "Sent SIG%s to all processes", "TERM"); |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 614 | sync(); |
| 615 | sleep(1); |
| 616 | |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 617 | kill(-1, SIGKILL); |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 618 | message(L_CONSOLE, "Sent SIG%s to all processes", "KILL"); |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 619 | sync(); |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 620 | /*sleep(1); - callers take care about making a pause */ |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 621 | } |
| 622 | |
| 623 | /* Signal handling by init: |
| 624 | * |
| 625 | * For process with PID==1, on entry kernel sets all signals to SIG_DFL |
| 626 | * and unmasks all signals. However, for process with PID==1, |
| 627 | * default action (SIG_DFL) on any signal is to ignore it, |
| 628 | * even for special signals SIGKILL and SIGCONT. |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 629 | * Also, any signal can be caught or blocked. |
Denis Vlasenko | fc2a4fc | 2009-01-31 01:07:05 +0000 | [diff] [blame] | 630 | * (but SIGSTOP is still handled specially, at least in 2.6.20) |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 631 | * |
| 632 | * We install two kinds of handlers, "immediate" and "delayed". |
| 633 | * |
| 634 | * Immediate handlers execute at any time, even while, say, sysinit |
| 635 | * is running. |
| 636 | * |
| 637 | * Delayed handlers just set a flag variable. The variable is checked |
| 638 | * in the main loop and acted upon. |
| 639 | * |
| 640 | * halt/poweroff/reboot and restart have immediate handlers. |
| 641 | * They only traverse linked list of struct action's, never modify it, |
| 642 | * this should be safe to do even in signal handler. Also they |
| 643 | * never return. |
| 644 | * |
| 645 | * SIGSTOP and SIGTSTP have immediate handlers. They just wait |
| 646 | * for SIGCONT to happen. |
| 647 | * |
| 648 | * SIGHUP has a delayed handler, because modifying linked list |
| 649 | * of struct action's from a signal handler while it is manipulated |
| 650 | * by the program may be disastrous. |
| 651 | * |
| 652 | * Ctrl-Alt-Del has a delayed handler. Not a must, but allowing |
| 653 | * it to happen even somewhere inside "sysinit" would be a bit awkward. |
| 654 | * |
| 655 | * There is a tiny probability that SIGHUP and Ctrl-Alt-Del will collide |
Denis Vlasenko | 93b3820 | 2009-02-14 20:58:13 +0000 | [diff] [blame] | 656 | * and only one will be remembered and acted upon. |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 657 | */ |
| 658 | |
Denys Vlasenko | bcc6ec9 | 2009-12-14 03:03:29 +0100 | [diff] [blame^] | 659 | /* The SIGUSR[12]/SIGTERM handler */ |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 660 | static void halt_reboot_pwoff(int sig) NORETURN; |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 661 | static void halt_reboot_pwoff(int sig) |
| 662 | { |
| 663 | const char *m; |
| 664 | unsigned rb; |
| 665 | |
Denys Vlasenko | bcc6ec9 | 2009-12-14 03:03:29 +0100 | [diff] [blame^] | 666 | /* We may call run() and it unmasks signals, |
| 667 | * including the one masked inside this signal handler. |
| 668 | * Testcase which would start multiple reboot scripts: |
| 669 | * while true; do reboot; done |
| 670 | * Preventing it: |
| 671 | */ |
| 672 | reset_sighandlers_and_unblock_sigs(); |
| 673 | |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 674 | run_shutdown_and_kill_processes(); |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 675 | |
| 676 | m = "halt"; |
| 677 | rb = RB_HALT_SYSTEM; |
| 678 | if (sig == SIGTERM) { |
| 679 | m = "reboot"; |
| 680 | rb = RB_AUTOBOOT; |
| 681 | } else if (sig == SIGUSR2) { |
| 682 | m = "poweroff"; |
| 683 | rb = RB_POWER_OFF; |
| 684 | } |
| 685 | message(L_CONSOLE, "Requesting system %s", m); |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 686 | pause_and_low_level_reboot(rb); |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 687 | /* not reached */ |
| 688 | } |
| 689 | |
Denys Vlasenko | bcc6ec9 | 2009-12-14 03:03:29 +0100 | [diff] [blame^] | 690 | /* Handler for QUIT - exec "restart" action, |
| 691 | * else (no such action defined) do nothing */ |
| 692 | static void restart_handler(int sig UNUSED_PARAM) |
| 693 | { |
| 694 | struct init_action *a; |
| 695 | |
| 696 | for (a = init_action_list; a; a = a->next) { |
| 697 | if (!(a->action_type & RESTART)) |
| 698 | continue; |
| 699 | |
| 700 | /* Starting from here, we won't return. |
| 701 | * Thus don't need to worry about preserving errno |
| 702 | * and such. |
| 703 | */ |
| 704 | |
| 705 | reset_sighandlers_and_unblock_sigs(); |
| 706 | |
| 707 | run_shutdown_and_kill_processes(); |
| 708 | |
| 709 | /* Allow Ctrl-Alt-Del to reboot the system. |
| 710 | * This is how kernel sets it up for init, we follow suit. |
| 711 | */ |
| 712 | reboot(RB_ENABLE_CAD); /* misnomer */ |
| 713 | |
| 714 | if (open_stdio_to_tty(a->terminal)) { |
| 715 | dbg_message(L_CONSOLE, "Trying to re-exec %s", a->command); |
| 716 | /* Theoretically should be safe. |
| 717 | * But in practice, kernel bugs may leave |
| 718 | * unkillable processes, and wait() may block forever. |
| 719 | * Oh well. Hoping "new" init won't be too surprised |
| 720 | * by having children it didn't create. |
| 721 | */ |
| 722 | //while (wait(NULL) > 0) |
| 723 | // continue; |
| 724 | init_exec(a->command); |
| 725 | } |
| 726 | /* Open or exec failed */ |
| 727 | pause_and_low_level_reboot(RB_HALT_SYSTEM); |
| 728 | /* not reached */ |
| 729 | } |
| 730 | } |
| 731 | |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 732 | /* The SIGSTOP/SIGTSTP handler |
| 733 | * NB: inside it, all signals except SIGCONT are masked |
| 734 | * via appropriate setup in sigaction(). |
| 735 | */ |
| 736 | static void stop_handler(int sig UNUSED_PARAM) |
| 737 | { |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 738 | smallint saved_bb_got_signal; |
Denis Vlasenko | 9ec0ecb | 2009-01-31 19:26:12 +0000 | [diff] [blame] | 739 | int saved_errno; |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 740 | |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 741 | saved_bb_got_signal = bb_got_signal; |
Denis Vlasenko | 9ec0ecb | 2009-01-31 19:26:12 +0000 | [diff] [blame] | 742 | saved_errno = errno; |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 743 | signal(SIGCONT, record_signo); |
| 744 | |
| 745 | while (1) { |
| 746 | pid_t wpid; |
| 747 | |
| 748 | if (bb_got_signal == SIGCONT) |
| 749 | break; |
| 750 | /* NB: this can accidentally wait() for a process |
| 751 | * which we waitfor() elsewhere! waitfor() must have |
| 752 | * code which is resilient against this. |
| 753 | */ |
| 754 | wpid = wait_any_nohang(NULL); |
Denis Vlasenko | 9ec0ecb | 2009-01-31 19:26:12 +0000 | [diff] [blame] | 755 | mark_terminated(wpid); |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 756 | sleep(1); |
| 757 | } |
| 758 | |
| 759 | signal(SIGCONT, SIG_DFL); |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 760 | errno = saved_errno; |
Denis Vlasenko | 9ec0ecb | 2009-01-31 19:26:12 +0000 | [diff] [blame] | 761 | bb_got_signal = saved_bb_got_signal; |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 762 | } |
| 763 | |
Denis Vlasenko | ad4da98 | 2008-04-05 04:24:23 +0000 | [diff] [blame] | 764 | #if ENABLE_FEATURE_USE_INITTAB |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 765 | static void reload_inittab(void) |
Eric Andersen | 6fd0e31 | 2003-07-22 09:48:56 +0000 | [diff] [blame] | 766 | { |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 767 | struct init_action *a, **nextp; |
Eric Andersen | 82baf63 | 2004-10-08 08:21:54 +0000 | [diff] [blame] | 768 | |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 769 | message(L_LOG, "reloading /etc/inittab"); |
Eric Andersen | 82baf63 | 2004-10-08 08:21:54 +0000 | [diff] [blame] | 770 | |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 771 | /* Disable old entries */ |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 772 | for (a = init_action_list; a; a = a->next) |
Denys Vlasenko | 6e54249 | 2009-11-15 03:07:19 +0100 | [diff] [blame] | 773 | a->action_type = 0; |
Eric Andersen | 82baf63 | 2004-10-08 08:21:54 +0000 | [diff] [blame] | 774 | |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 775 | /* Append new entries, or modify existing entries |
Denys Vlasenko | 6e54249 | 2009-11-15 03:07:19 +0100 | [diff] [blame] | 776 | * (incl. setting a->action_type) if cmd and device name |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 777 | * match new ones. End result: only entries with |
Denys Vlasenko | 6e54249 | 2009-11-15 03:07:19 +0100 | [diff] [blame] | 778 | * a->action_type == 0 are stale. |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 779 | */ |
Eric Andersen | 82baf63 | 2004-10-08 08:21:54 +0000 | [diff] [blame] | 780 | parse_inittab(); |
| 781 | |
Denis Vlasenko | 93b3820 | 2009-02-14 20:58:13 +0000 | [diff] [blame] | 782 | #if ENABLE_FEATURE_KILL_REMOVED |
| 783 | /* Kill stale entries */ |
| 784 | /* Be nice and send SIGTERM first */ |
| 785 | for (a = init_action_list; a; a = a->next) |
Denys Vlasenko | 6e54249 | 2009-11-15 03:07:19 +0100 | [diff] [blame] | 786 | if (a->action_type == 0 && a->pid != 0) |
Denis Vlasenko | 93b3820 | 2009-02-14 20:58:13 +0000 | [diff] [blame] | 787 | kill(a->pid, SIGTERM); |
| 788 | if (CONFIG_FEATURE_KILL_DELAY) { |
| 789 | /* NB: parent will wait in NOMMU case */ |
| 790 | if ((BB_MMU ? fork() : vfork()) == 0) { /* child */ |
| 791 | sleep(CONFIG_FEATURE_KILL_DELAY); |
| 792 | for (a = init_action_list; a; a = a->next) |
Denys Vlasenko | 6e54249 | 2009-11-15 03:07:19 +0100 | [diff] [blame] | 793 | if (a->action_type == 0 && a->pid != 0) |
Denis Vlasenko | 93b3820 | 2009-02-14 20:58:13 +0000 | [diff] [blame] | 794 | kill(a->pid, SIGKILL); |
| 795 | _exit(EXIT_SUCCESS); |
Denis Vlasenko | d55268d | 2007-12-26 18:32:58 +0000 | [diff] [blame] | 796 | } |
Denis Vlasenko | ec5631b | 2007-12-25 01:08:58 +0000 | [diff] [blame] | 797 | } |
Denis Vlasenko | 93b3820 | 2009-02-14 20:58:13 +0000 | [diff] [blame] | 798 | #endif |
Denis Vlasenko | ec5631b | 2007-12-25 01:08:58 +0000 | [diff] [blame] | 799 | |
Denys Vlasenko | 6e54249 | 2009-11-15 03:07:19 +0100 | [diff] [blame] | 800 | /* Remove stale entries and SYSINIT entries. |
| 801 | * We never rerun SYSINIT entries anyway, |
| 802 | * removing them too saves a few bytes */ |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 803 | nextp = &init_action_list; |
| 804 | while ((a = *nextp) != NULL) { |
Denys Vlasenko | 6e54249 | 2009-11-15 03:07:19 +0100 | [diff] [blame] | 805 | if ((a->action_type & ~SYSINIT) == 0) { |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 806 | *nextp = a->next; |
| 807 | free(a); |
| 808 | } else { |
| 809 | nextp = &a->next; |
| 810 | } |
Eric Andersen | 82baf63 | 2004-10-08 08:21:54 +0000 | [diff] [blame] | 811 | } |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 812 | |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 813 | /* Not needed: */ |
| 814 | /* run_actions(RESPAWN | ASKFIRST); */ |
| 815 | /* - we return to main loop, which does this automagically */ |
Eric Andersen | 6fd0e31 | 2003-07-22 09:48:56 +0000 | [diff] [blame] | 816 | } |
Denis Vlasenko | ad4da98 | 2008-04-05 04:24:23 +0000 | [diff] [blame] | 817 | #endif |
Eric Andersen | 82baf63 | 2004-10-08 08:21:54 +0000 | [diff] [blame] | 818 | |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 819 | static int check_delayed_sigs(void) |
| 820 | { |
| 821 | int sigs_seen = 0; |
| 822 | |
| 823 | while (1) { |
| 824 | smallint sig = bb_got_signal; |
| 825 | |
| 826 | if (!sig) |
| 827 | return sigs_seen; |
| 828 | bb_got_signal = 0; |
| 829 | sigs_seen = 1; |
| 830 | #if ENABLE_FEATURE_USE_INITTAB |
| 831 | if (sig == SIGHUP) |
| 832 | reload_inittab(); |
| 833 | #endif |
| 834 | if (sig == SIGINT) |
| 835 | run_actions(CTRLALTDEL); |
| 836 | } |
| 837 | } |
| 838 | |
Denis Vlasenko | 9b49a5e | 2007-10-11 10:05:36 +0000 | [diff] [blame] | 839 | int init_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
Denis Vlasenko | a60f84e | 2008-07-05 09:18:54 +0000 | [diff] [blame] | 840 | int init_main(int argc UNUSED_PARAM, char **argv) |
Eric Andersen | 0460ff2 | 1999-10-25 23:32:44 +0000 | [diff] [blame] | 841 | { |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 842 | die_sleep = 30 * 24*60*60; /* if xmalloc would ever die... */ |
Denis Vlasenko | 9b1381f | 2007-01-03 02:56:00 +0000 | [diff] [blame] | 843 | |
Denis Vlasenko | 1d42665 | 2008-03-17 09:09:09 +0000 | [diff] [blame] | 844 | if (argv[1] && !strcmp(argv[1], "-q")) { |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 845 | return kill(1, SIGHUP); |
Eric Andersen | 730f826 | 2001-12-17 23:13:08 +0000 | [diff] [blame] | 846 | } |
Mike Frysinger | bb50fdf | 2007-12-25 04:30:14 +0000 | [diff] [blame] | 847 | |
Denis Vlasenko | 5cb54b5 | 2008-10-21 17:14:26 +0000 | [diff] [blame] | 848 | if (!DEBUG_INIT) { |
Mike Frysinger | bb50fdf | 2007-12-25 04:30:14 +0000 | [diff] [blame] | 849 | /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */ |
| 850 | if (getpid() != 1 |
| 851 | && (!ENABLE_FEATURE_INITRD || !strstr(applet_name, "linuxrc")) |
| 852 | ) { |
| 853 | bb_show_usage(); |
| 854 | } |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 855 | /* Turn off rebooting via CTL-ALT-DEL - we get a |
Mike Frysinger | bb50fdf | 2007-12-25 04:30:14 +0000 | [diff] [blame] | 856 | * SIGINT on CAD so we can shut things down gracefully... */ |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 857 | reboot(RB_DISABLE_CAD); /* misnomer */ |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 858 | } |
Denis Vlasenko | d8540f7 | 2007-06-14 07:53:06 +0000 | [diff] [blame] | 859 | |
Eric Andersen | 599e3ce | 2002-07-03 11:08:10 +0000 | [diff] [blame] | 860 | /* Figure out where the default console should be */ |
| 861 | console_init(); |
Denis Vlasenko | d238a47 | 2007-03-05 19:22:04 +0000 | [diff] [blame] | 862 | set_sane_term(); |
Bernhard Reutner-Fischer | 54d50a0 | 2008-07-17 14:00:42 +0000 | [diff] [blame] | 863 | xchdir("/"); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 864 | setsid(); |
Denis Vlasenko | b8d1a4c | 2008-09-20 16:28:59 +0000 | [diff] [blame] | 865 | |
| 866 | /* Make sure environs is set to something sane */ |
| 867 | putenv((char *) "HOME=/"); |
| 868 | putenv((char *) bb_PATH_root_path); |
| 869 | putenv((char *) "SHELL=/bin/sh"); |
| 870 | putenv((char *) "USER=root"); /* needed? why? */ |
Rob Landley | cba1b96 | 2006-07-09 17:28:17 +0000 | [diff] [blame] | 871 | |
Bernhard Reutner-Fischer | 54d50a0 | 2008-07-17 14:00:42 +0000 | [diff] [blame] | 872 | if (argv[1]) |
Denis Vlasenko | b8d1a4c | 2008-09-20 16:28:59 +0000 | [diff] [blame] | 873 | xsetenv("RUNLEVEL", argv[1]); |
Rob Landley | cba1b96 | 2006-07-09 17:28:17 +0000 | [diff] [blame] | 874 | |
Denys Vlasenko | 6be918d | 2009-12-14 01:32:11 +0100 | [diff] [blame] | 875 | #if ENABLE_FEATURE_EXTRA_QUIET |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 876 | /* Hello world */ |
Denys Vlasenko | 6be918d | 2009-12-14 01:32:11 +0100 | [diff] [blame] | 877 | message(L_CONSOLE | L_LOG, "init started: %s", bb_banner); |
| 878 | #endif |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 879 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 880 | /* Make sure there is enough memory to do something useful. */ |
Rob Landley | c3386a4 | 2005-08-30 18:50:37 +0000 | [diff] [blame] | 881 | if (ENABLE_SWAPONOFF) { |
| 882 | struct sysinfo info; |
| 883 | |
Denis Vlasenko | 6c62246 | 2009-01-29 02:01:04 +0000 | [diff] [blame] | 884 | if (sysinfo(&info) == 0 |
Denys Vlasenko | 90a9904 | 2009-09-06 02:36:23 +0200 | [diff] [blame] | 885 | && (info.mem_unit ? info.mem_unit : 1) * (long long)info.totalram < 1024*1024 |
Denis Vlasenko | 6c62246 | 2009-01-29 02:01:04 +0000 | [diff] [blame] | 886 | ) { |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 887 | message(L_CONSOLE, "Low memory, forcing swapon"); |
Rob Landley | c3386a4 | 2005-08-30 18:50:37 +0000 | [diff] [blame] | 888 | /* swapon -a requires /proc typically */ |
Denis Vlasenko | 2f0c0d0 | 2007-01-21 00:41:04 +0000 | [diff] [blame] | 889 | new_init_action(SYSINIT, "mount -t proc proc /proc", ""); |
Rob Landley | c3386a4 | 2005-08-30 18:50:37 +0000 | [diff] [blame] | 890 | /* Try to turn on swap */ |
Denis Vlasenko | 2f0c0d0 | 2007-01-21 00:41:04 +0000 | [diff] [blame] | 891 | new_init_action(SYSINIT, "swapon -a", ""); |
Rob Landley | c3386a4 | 2005-08-30 18:50:37 +0000 | [diff] [blame] | 892 | run_actions(SYSINIT); /* wait and removing */ |
| 893 | } |
| 894 | } |
Erik Andersen | 9e73725 | 2000-01-06 01:16:13 +0000 | [diff] [blame] | 895 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 896 | /* Check if we are supposed to be in single user mode */ |
Denis Vlasenko | 1d42665 | 2008-03-17 09:09:09 +0000 | [diff] [blame] | 897 | if (argv[1] |
Denis Vlasenko | bf66fbc | 2006-12-21 13:23:14 +0000 | [diff] [blame] | 898 | && (!strcmp(argv[1], "single") || !strcmp(argv[1], "-s") || LONE_CHAR(argv[1], '1')) |
| 899 | ) { |
Bernhard Reutner-Fischer | 54d50a0 | 2008-07-17 14:00:42 +0000 | [diff] [blame] | 900 | /* ??? shouldn't we set RUNLEVEL="b" here? */ |
Glenn L McGrath | b4a1baa | 2003-01-13 22:09:50 +0000 | [diff] [blame] | 901 | /* Start a shell on console */ |
Glenn L McGrath | dc4e75e | 2003-09-02 02:36:18 +0000 | [diff] [blame] | 902 | new_init_action(RESPAWN, bb_default_login_shell, ""); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 903 | } else { |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 904 | /* Not in single user mode - see what inittab says */ |
Eric Andersen | 8a8fbb8 | 1999-10-26 00:18:56 +0000 | [diff] [blame] | 905 | |
Eric Andersen | bdfd0d7 | 2001-10-24 05:00:29 +0000 | [diff] [blame] | 906 | /* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined, |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 907 | * then parse_inittab() simply adds in some default |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 908 | * actions(i.e., INIT_SCRIPT and a pair |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 909 | * of "askfirst" shells */ |
| 910 | parse_inittab(); |
Eric Andersen | d00c262 | 1999-12-07 08:37:31 +0000 | [diff] [blame] | 911 | } |
Erik Andersen | 983b51b | 2000-04-04 18:14:25 +0000 | [diff] [blame] | 912 | |
Denis Vlasenko | 9b1381f | 2007-01-03 02:56:00 +0000 | [diff] [blame] | 913 | #if ENABLE_SELINUX |
Rob Landley | b3ede5a | 2006-03-27 23:09:12 +0000 | [diff] [blame] | 914 | if (getenv("SELINUX_INIT") == NULL) { |
| 915 | int enforce = 0; |
| 916 | |
Denis Vlasenko | d8540f7 | 2007-06-14 07:53:06 +0000 | [diff] [blame] | 917 | putenv((char*)"SELINUX_INIT=YES"); |
Rob Landley | b3ede5a | 2006-03-27 23:09:12 +0000 | [diff] [blame] | 918 | if (selinux_init_load_policy(&enforce) == 0) { |
Denis Vlasenko | 4921b54 | 2007-02-03 02:17:41 +0000 | [diff] [blame] | 919 | BB_EXECVP(argv[0], argv); |
Rob Landley | b3ede5a | 2006-03-27 23:09:12 +0000 | [diff] [blame] | 920 | } else if (enforce > 0) { |
| 921 | /* SELinux in enforcing mode but load_policy failed */ |
Denys Vlasenko | 6331cf0 | 2009-11-13 09:08:27 +0100 | [diff] [blame] | 922 | message(L_CONSOLE, "can't load SELinux Policy. " |
Denis Vlasenko | b716754 | 2007-02-27 19:20:00 +0000 | [diff] [blame] | 923 | "Machine is in enforcing mode. Halting now."); |
Bernhard Reutner-Fischer | 636a1f8 | 2008-05-19 09:29:47 +0000 | [diff] [blame] | 924 | exit(EXIT_FAILURE); |
Rob Landley | b3ede5a | 2006-03-27 23:09:12 +0000 | [diff] [blame] | 925 | } |
| 926 | } |
Denis Vlasenko | 6c62246 | 2009-01-29 02:01:04 +0000 | [diff] [blame] | 927 | #endif |
Rob Landley | b3ede5a | 2006-03-27 23:09:12 +0000 | [diff] [blame] | 928 | |
Denis Vlasenko | 2afabe8 | 2007-12-10 07:06:04 +0000 | [diff] [blame] | 929 | /* Make the command line just say "init" - thats all, nothing else */ |
| 930 | strncpy(argv[0], "init", strlen(argv[0])); |
| 931 | /* Wipe argv[1]-argv[N] so they don't clutter the ps listing */ |
| 932 | while (*++argv) |
| 933 | memset(*argv, 0, strlen(*argv)); |
Eric Andersen | 219d6f5 | 1999-11-02 19:43:01 +0000 | [diff] [blame] | 934 | |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 935 | /* Set up signal handlers */ |
| 936 | if (!DEBUG_INIT) { |
| 937 | struct sigaction sa; |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 938 | |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 939 | bb_signals(0 |
| 940 | + (1 << SIGUSR1) /* halt */ |
| 941 | + (1 << SIGTERM) /* reboot */ |
| 942 | + (1 << SIGUSR2) /* poweroff */ |
| 943 | , halt_reboot_pwoff); |
| 944 | signal(SIGQUIT, restart_handler); /* re-exec another init */ |
| 945 | |
| 946 | /* Stop handler must allow only SIGCONT inside itself */ |
| 947 | memset(&sa, 0, sizeof(sa)); |
| 948 | sigfillset(&sa.sa_mask); |
| 949 | sigdelset(&sa.sa_mask, SIGCONT); |
| 950 | sa.sa_handler = stop_handler; |
| 951 | /* NB: sa_flags doesn't have SA_RESTART. |
| 952 | * It must be able to interrupt wait(). |
| 953 | */ |
| 954 | sigaction_set(SIGTSTP, &sa); /* pause */ |
| 955 | /* Does not work as intended, at least in 2.6.20. |
| 956 | * SIGSTOP is simply ignored by init: |
| 957 | */ |
| 958 | sigaction_set(SIGSTOP, &sa); /* pause */ |
| 959 | |
| 960 | /* SIGINT (Ctrl-Alt-Del) must interrupt wait(), |
| 961 | * setting handler without SA_RESTART flag. |
| 962 | */ |
| 963 | bb_signals_recursive_norestart((1 << SIGINT), record_signo); |
| 964 | } |
| 965 | |
Denys Vlasenko | 6e54249 | 2009-11-15 03:07:19 +0100 | [diff] [blame] | 966 | /* Set up "reread /etc/inittab" handler. |
| 967 | * Handler is set up without SA_RESTART, it will interrupt syscalls. |
| 968 | */ |
| 969 | if (!DEBUG_INIT && ENABLE_FEATURE_USE_INITTAB) |
| 970 | bb_signals_recursive_norestart((1 << SIGHUP), record_signo); |
| 971 | |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 972 | /* Now run everything that needs to be run */ |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 973 | /* First run the sysinit command */ |
Eric Andersen | 1644db9 | 2001-09-05 20:18:15 +0000 | [diff] [blame] | 974 | run_actions(SYSINIT); |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 975 | check_delayed_sigs(); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 976 | /* Next run anything that wants to block */ |
Eric Andersen | 1644db9 | 2001-09-05 20:18:15 +0000 | [diff] [blame] | 977 | run_actions(WAIT); |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 978 | check_delayed_sigs(); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 979 | /* Next run anything to be run only once */ |
Eric Andersen | 0298be8 | 2002-03-05 15:12:19 +0000 | [diff] [blame] | 980 | run_actions(ONCE); |
| 981 | |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 982 | /* Now run the looping stuff for the rest of forever. |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 983 | */ |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 984 | while (1) { |
Denis Vlasenko | 4774179 | 2009-03-10 16:01:57 +0000 | [diff] [blame] | 985 | int maybe_WNOHANG; |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 986 | |
Denis Vlasenko | 4774179 | 2009-03-10 16:01:57 +0000 | [diff] [blame] | 987 | maybe_WNOHANG = check_delayed_sigs(); |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 988 | |
| 989 | /* (Re)run the respawn/askfirst stuff */ |
Denis Vlasenko | ad4da98 | 2008-04-05 04:24:23 +0000 | [diff] [blame] | 990 | run_actions(RESPAWN | ASKFIRST); |
Denis Vlasenko | 4774179 | 2009-03-10 16:01:57 +0000 | [diff] [blame] | 991 | maybe_WNOHANG |= check_delayed_sigs(); |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 992 | |
| 993 | /* Don't consume all CPU time - sleep a bit */ |
Eric Andersen | 0298be8 | 2002-03-05 15:12:19 +0000 | [diff] [blame] | 994 | sleep(1); |
Denis Vlasenko | 4774179 | 2009-03-10 16:01:57 +0000 | [diff] [blame] | 995 | maybe_WNOHANG |= check_delayed_sigs(); |
Eric Andersen | 0298be8 | 2002-03-05 15:12:19 +0000 | [diff] [blame] | 996 | |
Denis Vlasenko | 4774179 | 2009-03-10 16:01:57 +0000 | [diff] [blame] | 997 | /* Wait for any child process(es) to exit. |
Denys Vlasenko | 3ed181b | 2009-07-19 14:29:18 +0200 | [diff] [blame] | 998 | * |
| 999 | * If check_delayed_sigs above reported that a signal |
| 1000 | * was caught, wait will be nonblocking. This ensures |
| 1001 | * that if SIGHUP has reloaded inittab, respawn and askfirst |
| 1002 | * actions will not be delayed until next child death. |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 1003 | */ |
Denis Vlasenko | 4774179 | 2009-03-10 16:01:57 +0000 | [diff] [blame] | 1004 | if (maybe_WNOHANG) |
| 1005 | maybe_WNOHANG = WNOHANG; |
| 1006 | while (1) { |
| 1007 | pid_t wpid; |
| 1008 | struct init_action *a; |
| 1009 | |
Denys Vlasenko | 3ed181b | 2009-07-19 14:29:18 +0200 | [diff] [blame] | 1010 | /* If signals happen _in_ the wait, they interrupt it, |
| 1011 | * bb_signals_recursive_norestart set them up that way |
| 1012 | */ |
Denis Vlasenko | 4774179 | 2009-03-10 16:01:57 +0000 | [diff] [blame] | 1013 | wpid = waitpid(-1, NULL, maybe_WNOHANG); |
| 1014 | if (wpid <= 0) |
| 1015 | break; |
| 1016 | |
| 1017 | a = mark_terminated(wpid); |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 1018 | if (a) { |
| 1019 | message(L_LOG, "process '%s' (pid %d) exited. " |
| 1020 | "Scheduling for restart.", |
| 1021 | a->command, wpid); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 1022 | } |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 1023 | /* See if anyone else is waiting to be reaped */ |
Denis Vlasenko | 4774179 | 2009-03-10 16:01:57 +0000 | [diff] [blame] | 1024 | maybe_WNOHANG = WNOHANG; |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 1025 | } |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 1026 | } /* while (1) */ |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 1027 | } |