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> |
Jeremie Koenig | f812eac | 2010-05-27 15:37:32 +0200 | [diff] [blame^] | 17 | #ifdef __linux__ |
Denis Vlasenko | 5981ba5 | 2009-03-19 02:35:44 +0000 | [diff] [blame] | 18 | #include <linux/vt.h> |
Jeremie Koenig | f812eac | 2010-05-27 15:37:32 +0200 | [diff] [blame^] | 19 | #endif |
Denys Vlasenko | 87fb720 | 2010-04-06 18:49:28 +0200 | [diff] [blame] | 20 | #if ENABLE_FEATURE_UTMP |
| 21 | # include <utmp.h> /* DEAD_PROCESS */ |
| 22 | #endif |
Eric Andersen | 2c1de61 | 2003-04-24 11:41:28 +0000 | [diff] [blame] | 23 | |
Jeremie Koenig | f812eac | 2010-05-27 15:37:32 +0200 | [diff] [blame^] | 24 | /* Used only for sanitizing purposes in set_sane_term() below. On systems where |
| 25 | * the baud rate is stored in a separate field, we can safely disable them. */ |
| 26 | #ifndef CBAUD |
| 27 | # define CBAUD 0 |
| 28 | # define CBAUDEX 0 |
| 29 | #endif |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 30 | |
Denis Vlasenko | 5cb54b5 | 2008-10-21 17:14:26 +0000 | [diff] [blame] | 31 | /* Was a CONFIG_xxx option. A lot of people were building |
| 32 | * not fully functional init by switching it on! */ |
| 33 | #define DEBUG_INIT 0 |
| 34 | |
Denis Vlasenko | 6c62246 | 2009-01-29 02:01:04 +0000 | [diff] [blame] | 35 | #define COMMAND_SIZE 256 |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 36 | #define CONSOLE_NAME_SIZE 32 |
Eric Andersen | bd22ed8 | 2000-07-08 18:55:24 +0000 | [diff] [blame] | 37 | |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 38 | /* Default sysinit script. */ |
Erik Andersen | 96e2abd | 2000-01-07 11:40:44 +0000 | [diff] [blame] | 39 | #ifndef INIT_SCRIPT |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 40 | #define INIT_SCRIPT "/etc/init.d/rcS" |
Erik Andersen | 96e2abd | 2000-01-07 11:40:44 +0000 | [diff] [blame] | 41 | #endif |
Erik Andersen | 9c88cac | 1999-12-30 09:25:17 +0000 | [diff] [blame] | 42 | |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 43 | /* Each type of actions can appear many times. They will be |
| 44 | * handled in order. RESTART is an exception, only 1st is used. |
| 45 | */ |
| 46 | /* Start these actions first and wait for completion */ |
Denis Vlasenko | ad4da98 | 2008-04-05 04:24:23 +0000 | [diff] [blame] | 47 | #define SYSINIT 0x01 |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 48 | /* Start these after SYSINIT and wait for completion */ |
| 49 | #define WAIT 0x02 |
| 50 | /* Start these after WAIT and *dont* wait for completion */ |
| 51 | #define ONCE 0x04 |
| 52 | /* |
| 53 | * NB: while SYSINIT/WAIT/ONCE are being processed, |
Denys Vlasenko | 6e54249 | 2009-11-15 03:07:19 +0100 | [diff] [blame] | 54 | * SIGHUP ("reread /etc/inittab") will be processed only after |
| 55 | * each group of actions. If new inittab adds, say, a SYSINIT action, |
| 56 | * it will not be run, since init is already "past SYSINIT stage". |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 57 | */ |
| 58 | /* Start these after ONCE are started, restart on exit */ |
| 59 | #define RESPAWN 0x08 |
| 60 | /* Like RESPAWN, but wait for <Enter> to be pressed on tty */ |
| 61 | #define ASKFIRST 0x10 |
| 62 | /* |
| 63 | * Start these on SIGINT, and wait for completion. |
| 64 | * Then go back to respawning RESPAWN and ASKFIRST actions. |
| 65 | * NB: kernel sends SIGINT to us if Ctrl-Alt-Del was pressed. |
| 66 | */ |
Denis Vlasenko | ad4da98 | 2008-04-05 04:24:23 +0000 | [diff] [blame] | 67 | #define CTRLALTDEL 0x20 |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 68 | /* |
| 69 | * Start these before killing all processes in preparation for |
| 70 | * running RESTART actions or doing low-level halt/reboot/poweroff |
| 71 | * (initiated by SIGUSR1/SIGTERM/SIGUSR2). |
| 72 | * Wait for completion before proceeding. |
| 73 | */ |
Denis Vlasenko | ad4da98 | 2008-04-05 04:24:23 +0000 | [diff] [blame] | 74 | #define SHUTDOWN 0x40 |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 75 | /* |
| 76 | * exec() on SIGQUIT. SHUTDOWN actions are started and waited for, |
| 77 | * then all processes are killed, then init exec's 1st RESTART action, |
| 78 | * replacing itself by it. If no RESTART action specified, |
| 79 | * SIGQUIT has no effect. |
| 80 | */ |
Denis Vlasenko | ad4da98 | 2008-04-05 04:24:23 +0000 | [diff] [blame] | 81 | #define RESTART 0x80 |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 82 | |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 83 | |
| 84 | /* A linked list of init_actions, to be read from inittab */ |
Eric Andersen | 0298be8 | 2002-03-05 15:12:19 +0000 | [diff] [blame] | 85 | struct init_action { |
Eric Andersen | 0298be8 | 2002-03-05 15:12:19 +0000 | [diff] [blame] | 86 | struct init_action *next; |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 87 | pid_t pid; |
Denis Vlasenko | a37e713 | 2008-02-19 02:57:07 +0000 | [diff] [blame] | 88 | uint8_t action_type; |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 89 | char terminal[CONSOLE_NAME_SIZE]; |
Denis Vlasenko | a37e713 | 2008-02-19 02:57:07 +0000 | [diff] [blame] | 90 | char command[COMMAND_SIZE]; |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 91 | }; |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 92 | |
Eric Andersen | 0298be8 | 2002-03-05 15:12:19 +0000 | [diff] [blame] | 93 | static struct init_action *init_action_list = NULL; |
Glenn L McGrath | baf55a8 | 2002-08-22 18:22:10 +0000 | [diff] [blame] | 94 | |
Denis Vlasenko | 4c97863 | 2007-02-03 03:31:13 +0000 | [diff] [blame] | 95 | static const char *log_console = VC_5; |
Rob Landley | bc68cd1 | 2006-03-10 19:22:06 +0000 | [diff] [blame] | 96 | |
| 97 | enum { |
Denis Vlasenko | ec27feb | 2007-02-17 15:52:02 +0000 | [diff] [blame] | 98 | L_LOG = 0x1, |
| 99 | L_CONSOLE = 0x2, |
Rob Landley | bc68cd1 | 2006-03-10 19:22:06 +0000 | [diff] [blame] | 100 | #ifndef RB_HALT_SYSTEM |
Bernhard Reutner-Fischer | cf1f2ac | 2006-06-02 10:43:17 +0000 | [diff] [blame] | 101 | RB_HALT_SYSTEM = 0xcdef0123, /* FIXME: this overflows enum */ |
Rob Landley | bc68cd1 | 2006-03-10 19:22:06 +0000 | [diff] [blame] | 102 | RB_ENABLE_CAD = 0x89abcdef, |
| 103 | RB_DISABLE_CAD = 0, |
| 104 | RB_POWER_OFF = 0x4321fedc, |
| 105 | RB_AUTOBOOT = 0x01234567, |
Eric Andersen | 0298be8 | 2002-03-05 15:12:19 +0000 | [diff] [blame] | 106 | #endif |
Rob Landley | bc68cd1 | 2006-03-10 19:22:06 +0000 | [diff] [blame] | 107 | }; |
Erik Andersen | 42094cd | 2000-03-20 21:34:52 +0000 | [diff] [blame] | 108 | |
Erik Andersen | 42094cd | 2000-03-20 21:34:52 +0000 | [diff] [blame] | 109 | /* Print a message to the specified device. |
Denis Vlasenko | 671ca33 | 2008-02-19 14:13:20 +0000 | [diff] [blame] | 110 | * "where" may be bitwise-or'd from L_LOG | L_CONSOLE |
| 111 | * NB: careful, we can be called after vfork! |
| 112 | */ |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 113 | #define dbg_message(...) do { if (DEBUG_INIT) message(__VA_ARGS__); } while (0) |
Denis Vlasenko | 671ca33 | 2008-02-19 14:13:20 +0000 | [diff] [blame] | 114 | static void message(int where, const char *fmt, ...) |
Glenn L McGrath | baf55a8 | 2002-08-22 18:22:10 +0000 | [diff] [blame] | 115 | __attribute__ ((format(printf, 2, 3))); |
Denis Vlasenko | 671ca33 | 2008-02-19 14:13:20 +0000 | [diff] [blame] | 116 | static void message(int where, const char *fmt, ...) |
Eric Andersen | 0460ff2 | 1999-10-25 23:32:44 +0000 | [diff] [blame] | 117 | { |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 118 | va_list arguments; |
Denis Vlasenko | b8d1a4c | 2008-09-20 16:28:59 +0000 | [diff] [blame] | 119 | unsigned l; |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 120 | char msg[128]; |
| 121 | |
Glenn L McGrath | b4a1baa | 2003-01-13 22:09:50 +0000 | [diff] [blame] | 122 | msg[0] = '\r'; |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 123 | va_start(arguments, fmt); |
Denis Vlasenko | 1bcdcd2 | 2008-12-09 21:23:31 +0000 | [diff] [blame] | 124 | l = 1 + vsnprintf(msg + 1, sizeof(msg) - 2, fmt, arguments); |
| 125 | if (l > sizeof(msg) - 1) |
| 126 | l = sizeof(msg) - 1; |
Denis Vlasenko | ec27feb | 2007-02-17 15:52:02 +0000 | [diff] [blame] | 127 | va_end(arguments); |
Glenn L McGrath | b4a1baa | 2003-01-13 22:09:50 +0000 | [diff] [blame] | 128 | |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 129 | #if ENABLE_FEATURE_INIT_SYSLOG |
| 130 | msg[l] = '\0'; |
| 131 | if (where & L_LOG) { |
| 132 | /* Log the message to syslogd */ |
Denys Vlasenko | 1a8de6f | 2009-12-14 03:16:28 +0100 | [diff] [blame] | 133 | openlog(applet_name, 0, LOG_DAEMON); |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 134 | /* don't print "\r" */ |
| 135 | syslog(LOG_INFO, "%s", msg + 1); |
| 136 | closelog(); |
| 137 | } |
| 138 | msg[l++] = '\n'; |
| 139 | msg[l] = '\0'; |
| 140 | #else |
| 141 | { |
| 142 | static int log_fd = -1; |
| 143 | |
Mike Frysinger | bb50fdf | 2007-12-25 04:30:14 +0000 | [diff] [blame] | 144 | msg[l++] = '\n'; |
| 145 | msg[l] = '\0'; |
| 146 | /* Take full control of the log tty, and never close it. |
| 147 | * It's mine, all mine! Muhahahaha! */ |
| 148 | if (log_fd < 0) { |
| 149 | if (!log_console) { |
Bernhard Reutner-Fischer | ad2fa65 | 2008-07-21 11:16:39 +0000 | [diff] [blame] | 150 | log_fd = STDERR_FILENO; |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 151 | } else { |
Mike Frysinger | bb50fdf | 2007-12-25 04:30:14 +0000 | [diff] [blame] | 152 | log_fd = device_open(log_console, O_WRONLY | O_NONBLOCK | O_NOCTTY); |
| 153 | if (log_fd < 0) { |
| 154 | bb_error_msg("can't log to %s", log_console); |
Denis Vlasenko | 671ca33 | 2008-02-19 14:13:20 +0000 | [diff] [blame] | 155 | where = L_CONSOLE; |
Mike Frysinger | bb50fdf | 2007-12-25 04:30:14 +0000 | [diff] [blame] | 156 | } else { |
| 157 | close_on_exec_on(log_fd); |
| 158 | } |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 159 | } |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 160 | } |
Denis Vlasenko | 671ca33 | 2008-02-19 14:13:20 +0000 | [diff] [blame] | 161 | if (where & L_LOG) { |
Mike Frysinger | bb50fdf | 2007-12-25 04:30:14 +0000 | [diff] [blame] | 162 | full_write(log_fd, msg, l); |
Bernhard Reutner-Fischer | ad2fa65 | 2008-07-21 11:16:39 +0000 | [diff] [blame] | 163 | if (log_fd == STDERR_FILENO) |
Mike Frysinger | bb50fdf | 2007-12-25 04:30:14 +0000 | [diff] [blame] | 164 | return; /* don't print dup messages */ |
| 165 | } |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 166 | } |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 167 | #endif |
Eric Andersen | 4c78147 | 1999-11-26 08:12:56 +0000 | [diff] [blame] | 168 | |
Denis Vlasenko | 671ca33 | 2008-02-19 14:13:20 +0000 | [diff] [blame] | 169 | if (where & L_CONSOLE) { |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 170 | /* Send console messages to console so people will see them. */ |
Bernhard Reutner-Fischer | 5e25ddb | 2008-05-19 09:48:17 +0000 | [diff] [blame] | 171 | full_write(STDERR_FILENO, msg, l); |
Eric Andersen | 3ae0c78 | 1999-11-04 01:13:21 +0000 | [diff] [blame] | 172 | } |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 173 | } |
| 174 | |
Eric Andersen | 74400cc | 2001-10-18 04:11:39 +0000 | [diff] [blame] | 175 | static void console_init(void) |
Eric Andersen | 0460ff2 | 1999-10-25 23:32:44 +0000 | [diff] [blame] | 176 | { |
Jeremie Koenig | f812eac | 2010-05-27 15:37:32 +0200 | [diff] [blame^] | 177 | #ifdef VT_OPENQRY |
Denis Vlasenko | 5981ba5 | 2009-03-19 02:35:44 +0000 | [diff] [blame] | 178 | int vtno; |
Jeremie Koenig | f812eac | 2010-05-27 15:37:32 +0200 | [diff] [blame^] | 179 | #endif |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 180 | char *s; |
Eric Andersen | 0460ff2 | 1999-10-25 23:32:44 +0000 | [diff] [blame] | 181 | |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 182 | s = getenv("CONSOLE"); |
Bernhard Reutner-Fischer | ad2fa65 | 2008-07-21 11:16:39 +0000 | [diff] [blame] | 183 | if (!s) |
| 184 | s = getenv("console"); |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 185 | if (s) { |
| 186 | int fd = open(s, O_RDWR | O_NONBLOCK | O_NOCTTY); |
| 187 | if (fd >= 0) { |
Bernhard Reutner-Fischer | ad2fa65 | 2008-07-21 11:16:39 +0000 | [diff] [blame] | 188 | dup2(fd, STDIN_FILENO); |
| 189 | dup2(fd, STDOUT_FILENO); |
| 190 | xmove_fd(fd, STDERR_FILENO); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 191 | } |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 192 | dbg_message(L_LOG, "console='%s'", s); |
Denis Vlasenko | d8540f7 | 2007-06-14 07:53:06 +0000 | [diff] [blame] | 193 | } else { |
Denis Vlasenko | fb274df | 2008-03-17 13:26:51 +0000 | [diff] [blame] | 194 | /* Make sure fd 0,1,2 are not closed |
| 195 | * (so that they won't be used by future opens) */ |
Denis Vlasenko | d48e81f | 2008-07-06 07:00:11 +0000 | [diff] [blame] | 196 | bb_sanitize_stdio(); |
Denis Vlasenko | a34b8a4 | 2008-11-29 23:14:37 +0000 | [diff] [blame] | 197 | // Users report problems |
| 198 | // /* Make sure init can't be blocked by writing to stderr */ |
| 199 | // fcntl(STDERR_FILENO, F_SETFL, fcntl(STDERR_FILENO, F_GETFL) | O_NONBLOCK); |
Eric Andersen | 07e5297 | 1999-11-07 07:38:08 +0000 | [diff] [blame] | 200 | } |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 201 | |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 202 | s = getenv("TERM"); |
Jeremie Koenig | f812eac | 2010-05-27 15:37:32 +0200 | [diff] [blame^] | 203 | #ifdef VT_OPENQRY |
Denis Vlasenko | 5981ba5 | 2009-03-19 02:35:44 +0000 | [diff] [blame] | 204 | if (ioctl(STDIN_FILENO, VT_OPENQRY, &vtno) != 0) { |
| 205 | /* Not a linux terminal, probably serial console. |
| 206 | * Force the TERM setting to vt102 |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 207 | * if TERM is set to linux (the default) */ |
| 208 | if (!s || strcmp(s, "linux") == 0) |
| 209 | putenv((char*)"TERM=vt102"); |
Mike Frysinger | bb50fdf | 2007-12-25 04:30:14 +0000 | [diff] [blame] | 210 | if (!ENABLE_FEATURE_INIT_SYSLOG) |
| 211 | log_console = NULL; |
Jeremie Koenig | f812eac | 2010-05-27 15:37:32 +0200 | [diff] [blame^] | 212 | } else |
| 213 | #endif |
| 214 | if (!s) |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 215 | putenv((char*)"TERM=linux"); |
Eric Andersen | 0460ff2 | 1999-10-25 23:32:44 +0000 | [diff] [blame] | 216 | } |
Glenn L McGrath | baf55a8 | 2002-08-22 18:22:10 +0000 | [diff] [blame] | 217 | |
Denis Vlasenko | 671ca33 | 2008-02-19 14:13:20 +0000 | [diff] [blame] | 218 | /* Set terminal settings to reasonable defaults. |
| 219 | * NB: careful, we can be called after vfork! */ |
Denis Vlasenko | 2afabe8 | 2007-12-10 07:06:04 +0000 | [diff] [blame] | 220 | static void set_sane_term(void) |
Eric Andersen | 7ef1a5b | 2001-03-20 17:39:08 +0000 | [diff] [blame] | 221 | { |
Denis Vlasenko | 2afabe8 | 2007-12-10 07:06:04 +0000 | [diff] [blame] | 222 | struct termios tty; |
Eric Andersen | 7ef1a5b | 2001-03-20 17:39:08 +0000 | [diff] [blame] | 223 | |
Denis Vlasenko | 2afabe8 | 2007-12-10 07:06:04 +0000 | [diff] [blame] | 224 | tcgetattr(STDIN_FILENO, &tty); |
| 225 | |
| 226 | /* set control chars */ |
| 227 | tty.c_cc[VINTR] = 3; /* C-c */ |
| 228 | tty.c_cc[VQUIT] = 28; /* C-\ */ |
| 229 | tty.c_cc[VERASE] = 127; /* C-? */ |
| 230 | tty.c_cc[VKILL] = 21; /* C-u */ |
| 231 | tty.c_cc[VEOF] = 4; /* C-d */ |
| 232 | tty.c_cc[VSTART] = 17; /* C-q */ |
| 233 | tty.c_cc[VSTOP] = 19; /* C-s */ |
| 234 | tty.c_cc[VSUSP] = 26; /* C-z */ |
| 235 | |
Jeremie Koenig | f812eac | 2010-05-27 15:37:32 +0200 | [diff] [blame^] | 236 | #ifdef __linux__ |
Bernhard Reutner-Fischer | ad2fa65 | 2008-07-21 11:16:39 +0000 | [diff] [blame] | 237 | /* use line discipline 0 */ |
Denis Vlasenko | 2afabe8 | 2007-12-10 07:06:04 +0000 | [diff] [blame] | 238 | tty.c_line = 0; |
Jeremie Koenig | f812eac | 2010-05-27 15:37:32 +0200 | [diff] [blame^] | 239 | #endif |
Denis Vlasenko | 2afabe8 | 2007-12-10 07:06:04 +0000 | [diff] [blame] | 240 | |
| 241 | /* Make it be sane */ |
| 242 | tty.c_cflag &= CBAUD | CBAUDEX | CSIZE | CSTOPB | PARENB | PARODD; |
| 243 | tty.c_cflag |= CREAD | HUPCL | CLOCAL; |
| 244 | |
| 245 | /* input modes */ |
| 246 | tty.c_iflag = ICRNL | IXON | IXOFF; |
| 247 | |
| 248 | /* output modes */ |
| 249 | tty.c_oflag = OPOST | ONLCR; |
| 250 | |
| 251 | /* local modes */ |
| 252 | tty.c_lflag = |
| 253 | ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN; |
| 254 | |
Denis Vlasenko | 202ac50 | 2008-11-05 13:20:58 +0000 | [diff] [blame] | 255 | tcsetattr_stdin_TCSANOW(&tty); |
Eric Andersen | 7ef1a5b | 2001-03-20 17:39:08 +0000 | [diff] [blame] | 256 | } |
| 257 | |
Denis Vlasenko | 671ca33 | 2008-02-19 14:13:20 +0000 | [diff] [blame] | 258 | /* Open the new terminal device. |
| 259 | * NB: careful, we can be called after vfork! */ |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 260 | static int open_stdio_to_tty(const char* tty_name) |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 261 | { |
| 262 | /* empty tty_name means "use init's tty", else... */ |
| 263 | if (tty_name[0]) { |
Denis Vlasenko | d55268d | 2007-12-26 18:32:58 +0000 | [diff] [blame] | 264 | int fd; |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 265 | |
Bernhard Reutner-Fischer | ad2fa65 | 2008-07-21 11:16:39 +0000 | [diff] [blame] | 266 | close(STDIN_FILENO); |
Denis Vlasenko | d55268d | 2007-12-26 18:32:58 +0000 | [diff] [blame] | 267 | /* fd can be only < 0 or 0: */ |
| 268 | fd = device_open(tty_name, O_RDWR); |
| 269 | if (fd) { |
Bernhard Reutner-Fischer | a53de7f | 2008-07-21 13:46:54 +0000 | [diff] [blame] | 270 | message(L_LOG | L_CONSOLE, "can't open %s: %s", |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 271 | tty_name, strerror(errno)); |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 272 | return 0; /* failure */ |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 273 | } |
Bernhard Reutner-Fischer | ad2fa65 | 2008-07-21 11:16:39 +0000 | [diff] [blame] | 274 | dup2(STDIN_FILENO, STDOUT_FILENO); |
| 275 | dup2(STDIN_FILENO, STDERR_FILENO); |
Bernhard Reutner-Fischer | 0da069d | 2006-05-29 12:54:16 +0000 | [diff] [blame] | 276 | } |
Denis Vlasenko | d238a47 | 2007-03-05 19:22:04 +0000 | [diff] [blame] | 277 | set_sane_term(); |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 278 | return 1; /* success */ |
Bernhard Reutner-Fischer | 0da069d | 2006-05-29 12:54:16 +0000 | [diff] [blame] | 279 | } |
| 280 | |
Denys Vlasenko | bcc6ec9 | 2009-12-14 03:03:29 +0100 | [diff] [blame] | 281 | static void reset_sighandlers_and_unblock_sigs(void) |
| 282 | { |
| 283 | bb_signals(0 |
| 284 | + (1 << SIGUSR1) |
| 285 | + (1 << SIGUSR2) |
| 286 | + (1 << SIGTERM) |
| 287 | + (1 << SIGQUIT) |
| 288 | + (1 << SIGINT) |
| 289 | + (1 << SIGHUP) |
| 290 | + (1 << SIGTSTP) |
Denys Vlasenko | 18f8912 | 2009-12-14 03:08:30 +0100 | [diff] [blame] | 291 | + (1 << SIGSTOP) |
Denys Vlasenko | bcc6ec9 | 2009-12-14 03:03:29 +0100 | [diff] [blame] | 292 | , SIG_DFL); |
| 293 | sigprocmask_allsigs(SIG_UNBLOCK); |
| 294 | } |
| 295 | |
Denis Vlasenko | 671ca33 | 2008-02-19 14:13:20 +0000 | [diff] [blame] | 296 | /* Wrapper around exec: |
| 297 | * Takes string (max COMMAND_SIZE chars). |
| 298 | * If chars like '>' detected, execs '[-]/bin/sh -c "exec ......."'. |
| 299 | * Otherwise splits words on whitespace, deals with leading dash, |
| 300 | * and uses plain exec(). |
| 301 | * NB: careful, we can be called after vfork! |
Denis Vlasenko | a37e713 | 2008-02-19 02:57:07 +0000 | [diff] [blame] | 302 | */ |
| 303 | static void init_exec(const char *command) |
| 304 | { |
| 305 | char *cmd[COMMAND_SIZE / 2]; |
| 306 | char buf[COMMAND_SIZE + 6]; /* COMMAND_SIZE+strlen("exec ")+1 */ |
Denis Vlasenko | 671ca33 | 2008-02-19 14:13:20 +0000 | [diff] [blame] | 307 | int dash = (command[0] == '-' /* maybe? && command[1] == '/' */); |
Denis Vlasenko | a37e713 | 2008-02-19 02:57:07 +0000 | [diff] [blame] | 308 | |
| 309 | /* See if any special /bin/sh requiring characters are present */ |
| 310 | if (strpbrk(command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) { |
| 311 | strcpy(buf, "exec "); |
| 312 | strcpy(buf + 5, command + dash); /* excluding "-" */ |
Denis Vlasenko | 671ca33 | 2008-02-19 14:13:20 +0000 | [diff] [blame] | 313 | /* NB: LIBBB_DEFAULT_LOGIN_SHELL define has leading dash */ |
Denis Vlasenko | a37e713 | 2008-02-19 02:57:07 +0000 | [diff] [blame] | 314 | cmd[0] = (char*)(LIBBB_DEFAULT_LOGIN_SHELL + !dash); |
| 315 | cmd[1] = (char*)"-c"; |
| 316 | cmd[2] = buf; |
| 317 | cmd[3] = NULL; |
| 318 | } else { |
| 319 | /* Convert command (char*) into cmd (char**, one word per string) */ |
| 320 | char *word, *next; |
| 321 | int i = 0; |
| 322 | next = strcpy(buf, command); /* including "-" */ |
| 323 | while ((word = strsep(&next, " \t")) != NULL) { |
| 324 | if (*word != '\0') { /* not two spaces/tabs together? */ |
| 325 | cmd[i] = word; |
| 326 | i++; |
| 327 | } |
| 328 | } |
| 329 | cmd[i] = NULL; |
| 330 | } |
| 331 | /* If we saw leading "-", it is interactive shell. |
| 332 | * Try harder to give it a controlling tty. |
| 333 | * And skip "-" in actual exec call. */ |
| 334 | if (dash) { |
| 335 | /* _Attempt_ to make stdin a controlling tty. */ |
| 336 | if (ENABLE_FEATURE_INIT_SCTTY) |
| 337 | ioctl(STDIN_FILENO, TIOCSCTTY, 0 /*only try, don't steal*/); |
| 338 | } |
| 339 | BB_EXECVP(cmd[0] + dash, cmd); |
Denys Vlasenko | 6331cf0 | 2009-11-13 09:08:27 +0100 | [diff] [blame] | 340 | 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] | 341 | /* returns if execvp fails */ |
| 342 | } |
| 343 | |
Denis Vlasenko | 2afabe8 | 2007-12-10 07:06:04 +0000 | [diff] [blame] | 344 | /* Used only by run_actions */ |
Glenn L McGrath | b4a1baa | 2003-01-13 22:09:50 +0000 | [diff] [blame] | 345 | static pid_t run(const struct init_action *a) |
Eric Andersen | 0298be8 | 2002-03-05 15:12:19 +0000 | [diff] [blame] | 346 | { |
Mike Frysinger | 10427ab | 2005-07-06 05:00:48 +0000 | [diff] [blame] | 347 | pid_t pid; |
Erik Andersen | ac6e71f | 2000-01-08 22:04:33 +0000 | [diff] [blame] | 348 | |
Denis Vlasenko | 4774179 | 2009-03-10 16:01:57 +0000 | [diff] [blame] | 349 | /* Careful: don't be affected by a signal in vforked child */ |
| 350 | sigprocmask_allsigs(SIG_BLOCK); |
Denis Vlasenko | ad4da98 | 2008-04-05 04:24:23 +0000 | [diff] [blame] | 351 | if (BB_MMU && (a->action_type & ASKFIRST)) |
| 352 | pid = fork(); |
| 353 | else |
| 354 | pid = vfork(); |
Denis Vlasenko | 2afabe8 | 2007-12-10 07:06:04 +0000 | [diff] [blame] | 355 | if (pid < 0) |
Bernhard Reutner-Fischer | a53de7f | 2008-07-21 13:46:54 +0000 | [diff] [blame] | 356 | message(L_LOG | L_CONSOLE, "can't fork"); |
Denis Vlasenko | 4774179 | 2009-03-10 16:01:57 +0000 | [diff] [blame] | 357 | if (pid) { |
| 358 | sigprocmask_allsigs(SIG_UNBLOCK); |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 359 | return pid; /* Parent or error */ |
Denis Vlasenko | 4774179 | 2009-03-10 16:01:57 +0000 | [diff] [blame] | 360 | } |
Eric Andersen | 0298be8 | 2002-03-05 15:12:19 +0000 | [diff] [blame] | 361 | |
Denis Vlasenko | 2afabe8 | 2007-12-10 07:06:04 +0000 | [diff] [blame] | 362 | /* Child */ |
| 363 | |
Denis Vlasenko | 966bb43 | 2007-02-27 19:20:33 +0000 | [diff] [blame] | 364 | /* Reset signal handlers that were set by the parent process */ |
Denys Vlasenko | bcc6ec9 | 2009-12-14 03:03:29 +0100 | [diff] [blame] | 365 | reset_sighandlers_and_unblock_sigs(); |
Eric Andersen | 2f6c04f | 1999-11-01 23:59:44 +0000 | [diff] [blame] | 366 | |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 367 | /* Create a new session and make ourself the process group leader */ |
Denis Vlasenko | 966bb43 | 2007-02-27 19:20:33 +0000 | [diff] [blame] | 368 | setsid(); |
Eric Andersen | 599e3ce | 2002-07-03 11:08:10 +0000 | [diff] [blame] | 369 | |
Denis Vlasenko | 966bb43 | 2007-02-27 19:20:33 +0000 | [diff] [blame] | 370 | /* Open the new terminal device */ |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 371 | if (!open_stdio_to_tty(a->terminal)) |
| 372 | _exit(EXIT_FAILURE); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 373 | |
Denis Vlasenko | ad4da98 | 2008-04-05 04:24:23 +0000 | [diff] [blame] | 374 | /* NB: on NOMMU we can't wait for input in child, so |
| 375 | * "askfirst" will work the same as "respawn". */ |
Denis Vlasenko | 671ca33 | 2008-02-19 14:13:20 +0000 | [diff] [blame] | 376 | if (BB_MMU && (a->action_type & ASKFIRST)) { |
Denis Vlasenko | 6ca409e | 2007-08-12 20:58:27 +0000 | [diff] [blame] | 377 | static const char press_enter[] ALIGN1 = |
Denis Vlasenko | 966bb43 | 2007-02-27 19:20:33 +0000 | [diff] [blame] | 378 | #ifdef CUSTOMIZED_BANNER |
| 379 | #include CUSTOMIZED_BANNER |
Eric Andersen | 1f50e84 | 2004-08-16 09:29:42 +0000 | [diff] [blame] | 380 | #endif |
Denis Vlasenko | 966bb43 | 2007-02-27 19:20:33 +0000 | [diff] [blame] | 381 | "\nPlease press Enter to activate this console. "; |
| 382 | char c; |
| 383 | /* |
| 384 | * Save memory by not exec-ing anything large (like a shell) |
| 385 | * before the user wants it. This is critical if swap is not |
| 386 | * enabled and the system has low memory. Generally this will |
| 387 | * be run on the second virtual console, and the first will |
| 388 | * be allowed to start a shell or whatever an init script |
| 389 | * specifies. |
| 390 | */ |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 391 | dbg_message(L_LOG, "waiting for enter to start '%s'" |
Denis Vlasenko | 966bb43 | 2007-02-27 19:20:33 +0000 | [diff] [blame] | 392 | "(pid %d, tty '%s')\n", |
Denis Vlasenko | a37e713 | 2008-02-19 02:57:07 +0000 | [diff] [blame] | 393 | a->command, getpid(), a->terminal); |
Bernhard Reutner-Fischer | 5e25ddb | 2008-05-19 09:48:17 +0000 | [diff] [blame] | 394 | full_write(STDOUT_FILENO, press_enter, sizeof(press_enter) - 1); |
| 395 | while (safe_read(STDIN_FILENO, &c, 1) == 1 && c != '\n') |
Denis Vlasenko | 2afabe8 | 2007-12-10 07:06:04 +0000 | [diff] [blame] | 396 | continue; |
Denis Vlasenko | 966bb43 | 2007-02-27 19:20:33 +0000 | [diff] [blame] | 397 | } |
Denis Vlasenko | 2afabe8 | 2007-12-10 07:06:04 +0000 | [diff] [blame] | 398 | |
Denis Vlasenko | 6c62246 | 2009-01-29 02:01:04 +0000 | [diff] [blame] | 399 | /* |
| 400 | * When a file named /.init_enable_core exists, setrlimit is called |
| 401 | * before processes are spawned to set core file size as unlimited. |
| 402 | * This is for debugging only. Don't use this is production, unless |
| 403 | * you want core dumps lying about.... |
| 404 | */ |
Mike Frysinger | bb50fdf | 2007-12-25 04:30:14 +0000 | [diff] [blame] | 405 | if (ENABLE_FEATURE_INIT_COREDUMPS) { |
Denis Vlasenko | 6c62246 | 2009-01-29 02:01:04 +0000 | [diff] [blame] | 406 | if (access("/.init_enable_core", F_OK) == 0) { |
Denis Vlasenko | 966bb43 | 2007-02-27 19:20:33 +0000 | [diff] [blame] | 407 | struct rlimit limit; |
Denis Vlasenko | 966bb43 | 2007-02-27 19:20:33 +0000 | [diff] [blame] | 408 | limit.rlim_cur = RLIM_INFINITY; |
| 409 | limit.rlim_max = RLIM_INFINITY; |
| 410 | setrlimit(RLIMIT_CORE, &limit); |
Erik Andersen | 983b51b | 2000-04-04 18:14:25 +0000 | [diff] [blame] | 411 | } |
Erik Andersen | 05df239 | 2000-01-13 04:43:48 +0000 | [diff] [blame] | 412 | } |
Mike Frysinger | bb50fdf | 2007-12-25 04:30:14 +0000 | [diff] [blame] | 413 | |
Denis Vlasenko | a37e713 | 2008-02-19 02:57:07 +0000 | [diff] [blame] | 414 | /* Log the process name and args */ |
| 415 | message(L_LOG, "starting pid %d, tty '%s': '%s'", |
| 416 | getpid(), a->terminal, a->command); |
| 417 | |
Denis Vlasenko | 966bb43 | 2007-02-27 19:20:33 +0000 | [diff] [blame] | 418 | /* Now run it. The new program will take over this PID, |
| 419 | * so nothing further in init.c should be run. */ |
Denis Vlasenko | a37e713 | 2008-02-19 02:57:07 +0000 | [diff] [blame] | 420 | init_exec(a->command); |
Denis Vlasenko | 966bb43 | 2007-02-27 19:20:33 +0000 | [diff] [blame] | 421 | /* We're still here? Some error happened. */ |
Denis Vlasenko | 966bb43 | 2007-02-27 19:20:33 +0000 | [diff] [blame] | 422 | _exit(-1); |
Eric Andersen | 0460ff2 | 1999-10-25 23:32:44 +0000 | [diff] [blame] | 423 | } |
| 424 | |
Denis Vlasenko | 9ec0ecb | 2009-01-31 19:26:12 +0000 | [diff] [blame] | 425 | static struct init_action *mark_terminated(pid_t pid) |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 426 | { |
| 427 | struct init_action *a; |
| 428 | |
Denis Vlasenko | 9ec0ecb | 2009-01-31 19:26:12 +0000 | [diff] [blame] | 429 | if (pid > 0) { |
| 430 | for (a = init_action_list; a; a = a->next) { |
| 431 | if (a->pid == pid) { |
| 432 | a->pid = 0; |
| 433 | return a; |
| 434 | } |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 435 | } |
Denys Vlasenko | 87fb720 | 2010-04-06 18:49:28 +0200 | [diff] [blame] | 436 | update_utmp(pid, DEAD_PROCESS, /*tty_name:*/ NULL, /*username:*/ NULL, /*hostname:*/ NULL); |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 437 | } |
| 438 | return NULL; |
| 439 | } |
| 440 | |
Denis Vlasenko | cab28aa | 2009-01-31 01:02:07 +0000 | [diff] [blame] | 441 | static void waitfor(pid_t pid) |
| 442 | { |
| 443 | /* waitfor(run(x)): protect against failed fork inside run() */ |
| 444 | if (pid <= 0) |
| 445 | return; |
| 446 | |
| 447 | /* Wait for any child (prevent zombies from exiting orphaned processes) |
| 448 | * but exit the loop only when specified one has exited. */ |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 449 | while (1) { |
| 450 | pid_t wpid = wait(NULL); |
| 451 | mark_terminated(wpid); |
| 452 | /* Unsafe. SIGTSTP handler might have wait'ed it already */ |
| 453 | /*if (wpid == pid) break;*/ |
Denis Vlasenko | 9ec0ecb | 2009-01-31 19:26:12 +0000 | [diff] [blame] | 454 | /* More reliable: */ |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 455 | if (kill(pid, 0)) |
| 456 | break; |
| 457 | } |
Denis Vlasenko | cab28aa | 2009-01-31 01:02:07 +0000 | [diff] [blame] | 458 | } |
| 459 | |
Eric Andersen | 0298be8 | 2002-03-05 15:12:19 +0000 | [diff] [blame] | 460 | /* Run all commands of a particular type */ |
Denis Vlasenko | a37e713 | 2008-02-19 02:57:07 +0000 | [diff] [blame] | 461 | static void run_actions(int action_type) |
Eric Andersen | 219d6f5 | 1999-11-02 19:43:01 +0000 | [diff] [blame] | 462 | { |
Denis Vlasenko | a37e713 | 2008-02-19 02:57:07 +0000 | [diff] [blame] | 463 | struct init_action *a; |
Glenn L McGrath | baf55a8 | 2002-08-22 18:22:10 +0000 | [diff] [blame] | 464 | |
Denis Vlasenko | a37e713 | 2008-02-19 02:57:07 +0000 | [diff] [blame] | 465 | for (a = init_action_list; a; a = a->next) { |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 466 | if (!(a->action_type & action_type)) |
| 467 | continue; |
Eric Andersen | 5222d31 | 2002-07-03 05:15:23 +0000 | [diff] [blame] | 468 | |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 469 | if (a->action_type & (SYSINIT | WAIT | ONCE | CTRLALTDEL | SHUTDOWN)) { |
| 470 | pid_t pid = run(a); |
| 471 | if (a->action_type & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN)) |
| 472 | waitfor(pid); |
| 473 | } |
| 474 | if (a->action_type & (RESPAWN | ASKFIRST)) { |
| 475 | /* Only run stuff with pid == 0. If pid != 0, |
| 476 | * it is already running |
| 477 | */ |
| 478 | if (a->pid == 0) |
| 479 | a->pid = run(a); |
Eric Andersen | 730f826 | 2001-12-17 23:13:08 +0000 | [diff] [blame] | 480 | } |
| 481 | } |
| 482 | } |
| 483 | |
Denis Vlasenko | a37e713 | 2008-02-19 02:57:07 +0000 | [diff] [blame] | 484 | 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] | 485 | { |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 486 | struct init_action *a, **nextp; |
Erik Andersen | 9e73725 | 2000-01-06 01:16:13 +0000 | [diff] [blame] | 487 | |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 488 | /* Scenario: |
| 489 | * old inittab: |
| 490 | * ::shutdown:umount -a -r |
| 491 | * ::shutdown:swapoff -a |
| 492 | * new inittab: |
| 493 | * ::shutdown:swapoff -a |
| 494 | * ::shutdown:umount -a -r |
| 495 | * On reload, we must ensure entries end up in correct order. |
| 496 | * To achieve that, if we find a matching entry, we move it |
| 497 | * to the end. |
| 498 | */ |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 499 | nextp = &init_action_list; |
| 500 | while ((a = *nextp) != NULL) { |
| 501 | /* Don't enter action if it's already in the list, |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 502 | * This prevents losing running RESPAWNs. |
| 503 | */ |
Denys Vlasenko | 1a8de6f | 2009-12-14 03:16:28 +0100 | [diff] [blame] | 504 | if (strcmp(a->command, command) == 0 |
| 505 | && strcmp(a->terminal, cons) == 0 |
Denis Vlasenko | b74a2db | 2008-07-21 21:34:51 +0000 | [diff] [blame] | 506 | ) { |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 507 | /* Remove from list */ |
| 508 | *nextp = a->next; |
| 509 | /* Find the end of the list */ |
| 510 | while (*nextp != NULL) |
| 511 | nextp = &(*nextp)->next; |
| 512 | a->next = NULL; |
| 513 | break; |
Eric Andersen | 6fd0e31 | 2003-07-22 09:48:56 +0000 | [diff] [blame] | 514 | } |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 515 | nextp = &a->next; |
Eric Andersen | 6fd0e31 | 2003-07-22 09:48:56 +0000 | [diff] [blame] | 516 | } |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 517 | |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 518 | if (!a) |
| 519 | a = xzalloc(sizeof(*a)); |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 520 | /* Append to the end of the list */ |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 521 | *nextp = a; |
Denis Vlasenko | a37e713 | 2008-02-19 02:57:07 +0000 | [diff] [blame] | 522 | a->action_type = action_type; |
| 523 | safe_strncpy(a->command, command, sizeof(a->command)); |
| 524 | safe_strncpy(a->terminal, cons, sizeof(a->terminal)); |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 525 | 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] | 526 | a->command, a->action_type, a->terminal); |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 527 | } |
| 528 | |
Eric Andersen | bdfd0d7 | 2001-10-24 05:00:29 +0000 | [diff] [blame] | 529 | /* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined, |
Erik Andersen | 9e73725 | 2000-01-06 01:16:13 +0000 | [diff] [blame] | 530 | * then parse_inittab() simply adds in some default |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 531 | * actions(i.e., runs INIT_SCRIPT and then starts a pair |
| 532 | * of "askfirst" shells). If CONFIG_FEATURE_USE_INITTAB |
| 533 | * _is_ defined, but /etc/inittab is missing, this |
Erik Andersen | 812d466 | 2000-01-07 18:30:40 +0000 | [diff] [blame] | 534 | * results in the same set of default behaviors. |
Glenn L McGrath | baf55a8 | 2002-08-22 18:22:10 +0000 | [diff] [blame] | 535 | */ |
Eric Andersen | 3e6ff90 | 2001-03-09 21:24:12 +0000 | [diff] [blame] | 536 | static void parse_inittab(void) |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 537 | { |
Denis Vlasenko | 6c62246 | 2009-01-29 02:01:04 +0000 | [diff] [blame] | 538 | #if ENABLE_FEATURE_USE_INITTAB |
Bernhard Reutner-Fischer | 54d50a0 | 2008-07-17 14:00:42 +0000 | [diff] [blame] | 539 | char *token[4]; |
Denis Vlasenko | 6c62246 | 2009-01-29 02:01:04 +0000 | [diff] [blame] | 540 | parser_t *parser = config_open2("/etc/inittab", fopen_for_read); |
Bernhard Reutner-Fischer | 54d50a0 | 2008-07-17 14:00:42 +0000 | [diff] [blame] | 541 | |
Denis Vlasenko | 6c62246 | 2009-01-29 02:01:04 +0000 | [diff] [blame] | 542 | if (parser == NULL) |
| 543 | #endif |
| 544 | { |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 545 | /* No inittab file - set up some default behavior */ |
Bernhard Reutner-Fischer | 54d50a0 | 2008-07-17 14:00:42 +0000 | [diff] [blame] | 546 | /* Reboot on Ctrl-Alt-Del */ |
| 547 | new_init_action(CTRLALTDEL, "reboot", ""); |
| 548 | /* Umount all filesystems on halt/reboot */ |
| 549 | new_init_action(SHUTDOWN, "umount -a -r", ""); |
| 550 | /* Swapoff on halt/reboot */ |
| 551 | if (ENABLE_SWAPONOFF) |
| 552 | new_init_action(SHUTDOWN, "swapoff -a", ""); |
| 553 | /* Prepare to restart init when a QUIT is received */ |
| 554 | new_init_action(RESTART, "init", ""); |
| 555 | /* Askfirst shell on tty1-4 */ |
| 556 | new_init_action(ASKFIRST, bb_default_login_shell, ""); |
Denis Vlasenko | a474b68 | 2008-07-17 17:58:44 +0000 | [diff] [blame] | 557 | //TODO: VC_1 instead of ""? "" is console -> ctty problems -> angry users |
Bernhard Reutner-Fischer | 54d50a0 | 2008-07-17 14:00:42 +0000 | [diff] [blame] | 558 | new_init_action(ASKFIRST, bb_default_login_shell, VC_2); |
| 559 | new_init_action(ASKFIRST, bb_default_login_shell, VC_3); |
| 560 | new_init_action(ASKFIRST, bb_default_login_shell, VC_4); |
| 561 | /* sysinit */ |
| 562 | new_init_action(SYSINIT, INIT_SCRIPT, ""); |
Bernhard Reutner-Fischer | 54d50a0 | 2008-07-17 14:00:42 +0000 | [diff] [blame] | 563 | return; |
| 564 | } |
Denis Vlasenko | 6c62246 | 2009-01-29 02:01:04 +0000 | [diff] [blame] | 565 | |
| 566 | #if ENABLE_FEATURE_USE_INITTAB |
Bernhard Reutner-Fischer | 54d50a0 | 2008-07-17 14:00:42 +0000 | [diff] [blame] | 567 | /* optional_tty:ignored_runlevel:action:command |
Denis Vlasenko | a474b68 | 2008-07-17 17:58:44 +0000 | [diff] [blame] | 568 | * Delims are not to be collapsed and need exactly 4 tokens |
Bernhard Reutner-Fischer | 54d50a0 | 2008-07-17 14:00:42 +0000 | [diff] [blame] | 569 | */ |
Denis Vlasenko | 084266e | 2008-07-26 23:08:31 +0000 | [diff] [blame] | 570 | while (config_read(parser, token, 4, 0, "#:", |
| 571 | PARSE_NORMAL & ~(PARSE_TRIM | PARSE_COLLAPSE))) { |
Denis Vlasenko | 6c62246 | 2009-01-29 02:01:04 +0000 | [diff] [blame] | 572 | /* order must correspond to SYSINIT..RESTART constants */ |
| 573 | static const char actions[] ALIGN1 = |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 574 | "sysinit\0""wait\0""once\0""respawn\0""askfirst\0" |
Denis Vlasenko | 6c62246 | 2009-01-29 02:01:04 +0000 | [diff] [blame] | 575 | "ctrlaltdel\0""shutdown\0""restart\0"; |
Denis Vlasenko | a474b68 | 2008-07-17 17:58:44 +0000 | [diff] [blame] | 576 | int action; |
Bernhard Reutner-Fischer | 54d50a0 | 2008-07-17 14:00:42 +0000 | [diff] [blame] | 577 | char *tty = token[0]; |
Bernhard Reutner-Fischer | 54d50a0 | 2008-07-17 14:00:42 +0000 | [diff] [blame] | 578 | |
Denis Vlasenko | a474b68 | 2008-07-17 17:58:44 +0000 | [diff] [blame] | 579 | if (!token[3]) /* less than 4 tokens */ |
Bernhard Reutner-Fischer | 54d50a0 | 2008-07-17 14:00:42 +0000 | [diff] [blame] | 580 | goto bad_entry; |
Denis Vlasenko | a474b68 | 2008-07-17 17:58:44 +0000 | [diff] [blame] | 581 | action = index_in_strings(actions, token[2]); |
| 582 | if (action < 0 || !token[3][0]) /* token[3]: command */ |
| 583 | goto bad_entry; |
| 584 | /* turn .*TTY -> /dev/TTY */ |
| 585 | if (tty[0]) { |
Denys Vlasenko | f8d8aa1 | 2010-04-06 18:50:05 +0200 | [diff] [blame] | 586 | tty = concat_path_file("/dev/", skip_dev_pfx(tty)); |
Denis Vlasenko | a474b68 | 2008-07-17 17:58:44 +0000 | [diff] [blame] | 587 | } |
| 588 | new_init_action(1 << action, token[3], tty); |
| 589 | if (tty[0]) |
Bernhard Reutner-Fischer | 54d50a0 | 2008-07-17 14:00:42 +0000 | [diff] [blame] | 590 | free(tty); |
| 591 | continue; |
| 592 | bad_entry: |
Bernhard Reutner-Fischer | ad2fa65 | 2008-07-21 11:16:39 +0000 | [diff] [blame] | 593 | message(L_LOG | L_CONSOLE, "Bad inittab entry at line %d", |
| 594 | parser->lineno); |
Bernhard Reutner-Fischer | 54d50a0 | 2008-07-17 14:00:42 +0000 | [diff] [blame] | 595 | } |
| 596 | config_close(parser); |
Denis Vlasenko | 6c62246 | 2009-01-29 02:01:04 +0000 | [diff] [blame] | 597 | #endif |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 598 | } |
| 599 | |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 600 | static void pause_and_low_level_reboot(unsigned magic) NORETURN; |
| 601 | static void pause_and_low_level_reboot(unsigned magic) |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 602 | { |
| 603 | pid_t pid; |
| 604 | |
| 605 | /* Allow time for last message to reach serial console, etc */ |
| 606 | sleep(1); |
| 607 | |
| 608 | /* We have to fork here, since the kernel calls do_exit(EXIT_SUCCESS) |
| 609 | * in linux/kernel/sys.c, which can cause the machine to panic when |
| 610 | * the init process exits... */ |
| 611 | pid = vfork(); |
| 612 | if (pid == 0) { /* child */ |
| 613 | reboot(magic); |
| 614 | _exit(EXIT_SUCCESS); |
| 615 | } |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 616 | while (1) |
| 617 | sleep(1); |
| 618 | } |
| 619 | |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 620 | static void run_shutdown_and_kill_processes(void) |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 621 | { |
| 622 | /* Run everything to be run at "shutdown". This is done _prior_ |
| 623 | * to killing everything, in case people wish to use scripts to |
| 624 | * shut things down gracefully... */ |
| 625 | run_actions(SHUTDOWN); |
| 626 | |
| 627 | message(L_CONSOLE | L_LOG, "The system is going down NOW!"); |
| 628 | |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 629 | /* Send signals to every process _except_ pid 1 */ |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 630 | kill(-1, SIGTERM); |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 631 | message(L_CONSOLE | L_LOG, "Sent SIG%s to all processes", "TERM"); |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 632 | sync(); |
| 633 | sleep(1); |
| 634 | |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 635 | kill(-1, SIGKILL); |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 636 | message(L_CONSOLE, "Sent SIG%s to all processes", "KILL"); |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 637 | sync(); |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 638 | /*sleep(1); - callers take care about making a pause */ |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 639 | } |
| 640 | |
| 641 | /* Signal handling by init: |
| 642 | * |
| 643 | * For process with PID==1, on entry kernel sets all signals to SIG_DFL |
| 644 | * and unmasks all signals. However, for process with PID==1, |
| 645 | * default action (SIG_DFL) on any signal is to ignore it, |
| 646 | * even for special signals SIGKILL and SIGCONT. |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 647 | * Also, any signal can be caught or blocked. |
Denis Vlasenko | fc2a4fc | 2009-01-31 01:07:05 +0000 | [diff] [blame] | 648 | * (but SIGSTOP is still handled specially, at least in 2.6.20) |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 649 | * |
| 650 | * We install two kinds of handlers, "immediate" and "delayed". |
| 651 | * |
| 652 | * Immediate handlers execute at any time, even while, say, sysinit |
| 653 | * is running. |
| 654 | * |
| 655 | * Delayed handlers just set a flag variable. The variable is checked |
| 656 | * in the main loop and acted upon. |
| 657 | * |
| 658 | * halt/poweroff/reboot and restart have immediate handlers. |
| 659 | * They only traverse linked list of struct action's, never modify it, |
| 660 | * this should be safe to do even in signal handler. Also they |
| 661 | * never return. |
| 662 | * |
| 663 | * SIGSTOP and SIGTSTP have immediate handlers. They just wait |
| 664 | * for SIGCONT to happen. |
| 665 | * |
| 666 | * SIGHUP has a delayed handler, because modifying linked list |
| 667 | * of struct action's from a signal handler while it is manipulated |
| 668 | * by the program may be disastrous. |
| 669 | * |
| 670 | * Ctrl-Alt-Del has a delayed handler. Not a must, but allowing |
| 671 | * it to happen even somewhere inside "sysinit" would be a bit awkward. |
| 672 | * |
| 673 | * 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] | 674 | * and only one will be remembered and acted upon. |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 675 | */ |
| 676 | |
Denys Vlasenko | bcc6ec9 | 2009-12-14 03:03:29 +0100 | [diff] [blame] | 677 | /* The SIGUSR[12]/SIGTERM handler */ |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 678 | static void halt_reboot_pwoff(int sig) NORETURN; |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 679 | static void halt_reboot_pwoff(int sig) |
| 680 | { |
| 681 | const char *m; |
| 682 | unsigned rb; |
| 683 | |
Denys Vlasenko | bcc6ec9 | 2009-12-14 03:03:29 +0100 | [diff] [blame] | 684 | /* We may call run() and it unmasks signals, |
| 685 | * including the one masked inside this signal handler. |
| 686 | * Testcase which would start multiple reboot scripts: |
| 687 | * while true; do reboot; done |
| 688 | * Preventing it: |
| 689 | */ |
| 690 | reset_sighandlers_and_unblock_sigs(); |
| 691 | |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 692 | run_shutdown_and_kill_processes(); |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 693 | |
| 694 | m = "halt"; |
| 695 | rb = RB_HALT_SYSTEM; |
| 696 | if (sig == SIGTERM) { |
| 697 | m = "reboot"; |
| 698 | rb = RB_AUTOBOOT; |
| 699 | } else if (sig == SIGUSR2) { |
| 700 | m = "poweroff"; |
| 701 | rb = RB_POWER_OFF; |
| 702 | } |
| 703 | message(L_CONSOLE, "Requesting system %s", m); |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 704 | pause_and_low_level_reboot(rb); |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 705 | /* not reached */ |
| 706 | } |
| 707 | |
Denys Vlasenko | bcc6ec9 | 2009-12-14 03:03:29 +0100 | [diff] [blame] | 708 | /* Handler for QUIT - exec "restart" action, |
| 709 | * else (no such action defined) do nothing */ |
| 710 | static void restart_handler(int sig UNUSED_PARAM) |
| 711 | { |
| 712 | struct init_action *a; |
| 713 | |
| 714 | for (a = init_action_list; a; a = a->next) { |
| 715 | if (!(a->action_type & RESTART)) |
| 716 | continue; |
| 717 | |
| 718 | /* Starting from here, we won't return. |
| 719 | * Thus don't need to worry about preserving errno |
| 720 | * and such. |
| 721 | */ |
| 722 | |
| 723 | reset_sighandlers_and_unblock_sigs(); |
| 724 | |
| 725 | run_shutdown_and_kill_processes(); |
| 726 | |
| 727 | /* Allow Ctrl-Alt-Del to reboot the system. |
| 728 | * This is how kernel sets it up for init, we follow suit. |
| 729 | */ |
| 730 | reboot(RB_ENABLE_CAD); /* misnomer */ |
| 731 | |
| 732 | if (open_stdio_to_tty(a->terminal)) { |
| 733 | dbg_message(L_CONSOLE, "Trying to re-exec %s", a->command); |
| 734 | /* Theoretically should be safe. |
| 735 | * But in practice, kernel bugs may leave |
| 736 | * unkillable processes, and wait() may block forever. |
| 737 | * Oh well. Hoping "new" init won't be too surprised |
| 738 | * by having children it didn't create. |
| 739 | */ |
| 740 | //while (wait(NULL) > 0) |
| 741 | // continue; |
| 742 | init_exec(a->command); |
| 743 | } |
| 744 | /* Open or exec failed */ |
| 745 | pause_and_low_level_reboot(RB_HALT_SYSTEM); |
| 746 | /* not reached */ |
| 747 | } |
| 748 | } |
| 749 | |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 750 | /* The SIGSTOP/SIGTSTP handler |
| 751 | * NB: inside it, all signals except SIGCONT are masked |
| 752 | * via appropriate setup in sigaction(). |
| 753 | */ |
| 754 | static void stop_handler(int sig UNUSED_PARAM) |
| 755 | { |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 756 | smallint saved_bb_got_signal; |
Denis Vlasenko | 9ec0ecb | 2009-01-31 19:26:12 +0000 | [diff] [blame] | 757 | int saved_errno; |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 758 | |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 759 | saved_bb_got_signal = bb_got_signal; |
Denis Vlasenko | 9ec0ecb | 2009-01-31 19:26:12 +0000 | [diff] [blame] | 760 | saved_errno = errno; |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 761 | signal(SIGCONT, record_signo); |
| 762 | |
| 763 | while (1) { |
| 764 | pid_t wpid; |
| 765 | |
| 766 | if (bb_got_signal == SIGCONT) |
| 767 | break; |
| 768 | /* NB: this can accidentally wait() for a process |
| 769 | * which we waitfor() elsewhere! waitfor() must have |
| 770 | * code which is resilient against this. |
| 771 | */ |
| 772 | wpid = wait_any_nohang(NULL); |
Denis Vlasenko | 9ec0ecb | 2009-01-31 19:26:12 +0000 | [diff] [blame] | 773 | mark_terminated(wpid); |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 774 | sleep(1); |
| 775 | } |
| 776 | |
| 777 | signal(SIGCONT, SIG_DFL); |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 778 | errno = saved_errno; |
Denis Vlasenko | 9ec0ecb | 2009-01-31 19:26:12 +0000 | [diff] [blame] | 779 | bb_got_signal = saved_bb_got_signal; |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 780 | } |
| 781 | |
Denis Vlasenko | ad4da98 | 2008-04-05 04:24:23 +0000 | [diff] [blame] | 782 | #if ENABLE_FEATURE_USE_INITTAB |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 783 | static void reload_inittab(void) |
Eric Andersen | 6fd0e31 | 2003-07-22 09:48:56 +0000 | [diff] [blame] | 784 | { |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 785 | struct init_action *a, **nextp; |
Eric Andersen | 82baf63 | 2004-10-08 08:21:54 +0000 | [diff] [blame] | 786 | |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 787 | message(L_LOG, "reloading /etc/inittab"); |
Eric Andersen | 82baf63 | 2004-10-08 08:21:54 +0000 | [diff] [blame] | 788 | |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 789 | /* Disable old entries */ |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 790 | for (a = init_action_list; a; a = a->next) |
Denys Vlasenko | 6e54249 | 2009-11-15 03:07:19 +0100 | [diff] [blame] | 791 | a->action_type = 0; |
Eric Andersen | 82baf63 | 2004-10-08 08:21:54 +0000 | [diff] [blame] | 792 | |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 793 | /* Append new entries, or modify existing entries |
Denys Vlasenko | 6e54249 | 2009-11-15 03:07:19 +0100 | [diff] [blame] | 794 | * (incl. setting a->action_type) if cmd and device name |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 795 | * match new ones. End result: only entries with |
Denys Vlasenko | 6e54249 | 2009-11-15 03:07:19 +0100 | [diff] [blame] | 796 | * a->action_type == 0 are stale. |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 797 | */ |
Eric Andersen | 82baf63 | 2004-10-08 08:21:54 +0000 | [diff] [blame] | 798 | parse_inittab(); |
| 799 | |
Denis Vlasenko | 93b3820 | 2009-02-14 20:58:13 +0000 | [diff] [blame] | 800 | #if ENABLE_FEATURE_KILL_REMOVED |
| 801 | /* Kill stale entries */ |
| 802 | /* Be nice and send SIGTERM first */ |
| 803 | for (a = init_action_list; a; a = a->next) |
Denys Vlasenko | 6e54249 | 2009-11-15 03:07:19 +0100 | [diff] [blame] | 804 | if (a->action_type == 0 && a->pid != 0) |
Denis Vlasenko | 93b3820 | 2009-02-14 20:58:13 +0000 | [diff] [blame] | 805 | kill(a->pid, SIGTERM); |
| 806 | if (CONFIG_FEATURE_KILL_DELAY) { |
| 807 | /* NB: parent will wait in NOMMU case */ |
| 808 | if ((BB_MMU ? fork() : vfork()) == 0) { /* child */ |
| 809 | sleep(CONFIG_FEATURE_KILL_DELAY); |
| 810 | for (a = init_action_list; a; a = a->next) |
Denys Vlasenko | 6e54249 | 2009-11-15 03:07:19 +0100 | [diff] [blame] | 811 | if (a->action_type == 0 && a->pid != 0) |
Denis Vlasenko | 93b3820 | 2009-02-14 20:58:13 +0000 | [diff] [blame] | 812 | kill(a->pid, SIGKILL); |
| 813 | _exit(EXIT_SUCCESS); |
Denis Vlasenko | d55268d | 2007-12-26 18:32:58 +0000 | [diff] [blame] | 814 | } |
Denis Vlasenko | ec5631b | 2007-12-25 01:08:58 +0000 | [diff] [blame] | 815 | } |
Denis Vlasenko | 93b3820 | 2009-02-14 20:58:13 +0000 | [diff] [blame] | 816 | #endif |
Denis Vlasenko | ec5631b | 2007-12-25 01:08:58 +0000 | [diff] [blame] | 817 | |
Denys Vlasenko | 6e54249 | 2009-11-15 03:07:19 +0100 | [diff] [blame] | 818 | /* Remove stale entries and SYSINIT entries. |
| 819 | * We never rerun SYSINIT entries anyway, |
| 820 | * removing them too saves a few bytes */ |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 821 | nextp = &init_action_list; |
| 822 | while ((a = *nextp) != NULL) { |
Denys Vlasenko | 6e54249 | 2009-11-15 03:07:19 +0100 | [diff] [blame] | 823 | if ((a->action_type & ~SYSINIT) == 0) { |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 824 | *nextp = a->next; |
| 825 | free(a); |
| 826 | } else { |
| 827 | nextp = &a->next; |
| 828 | } |
Eric Andersen | 82baf63 | 2004-10-08 08:21:54 +0000 | [diff] [blame] | 829 | } |
Denis Vlasenko | 4ae8a05 | 2009-01-31 18:55:54 +0000 | [diff] [blame] | 830 | |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 831 | /* Not needed: */ |
| 832 | /* run_actions(RESPAWN | ASKFIRST); */ |
| 833 | /* - we return to main loop, which does this automagically */ |
Eric Andersen | 6fd0e31 | 2003-07-22 09:48:56 +0000 | [diff] [blame] | 834 | } |
Denis Vlasenko | ad4da98 | 2008-04-05 04:24:23 +0000 | [diff] [blame] | 835 | #endif |
Eric Andersen | 82baf63 | 2004-10-08 08:21:54 +0000 | [diff] [blame] | 836 | |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 837 | static int check_delayed_sigs(void) |
| 838 | { |
| 839 | int sigs_seen = 0; |
| 840 | |
| 841 | while (1) { |
| 842 | smallint sig = bb_got_signal; |
| 843 | |
| 844 | if (!sig) |
| 845 | return sigs_seen; |
| 846 | bb_got_signal = 0; |
| 847 | sigs_seen = 1; |
| 848 | #if ENABLE_FEATURE_USE_INITTAB |
| 849 | if (sig == SIGHUP) |
| 850 | reload_inittab(); |
| 851 | #endif |
| 852 | if (sig == SIGINT) |
| 853 | run_actions(CTRLALTDEL); |
| 854 | } |
| 855 | } |
| 856 | |
Denis Vlasenko | 9b49a5e | 2007-10-11 10:05:36 +0000 | [diff] [blame] | 857 | int init_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
Denis Vlasenko | a60f84e | 2008-07-05 09:18:54 +0000 | [diff] [blame] | 858 | int init_main(int argc UNUSED_PARAM, char **argv) |
Eric Andersen | 0460ff2 | 1999-10-25 23:32:44 +0000 | [diff] [blame] | 859 | { |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 860 | die_sleep = 30 * 24*60*60; /* if xmalloc would ever die... */ |
Denis Vlasenko | 9b1381f | 2007-01-03 02:56:00 +0000 | [diff] [blame] | 861 | |
Denys Vlasenko | 1a8de6f | 2009-12-14 03:16:28 +0100 | [diff] [blame] | 862 | if (argv[1] && strcmp(argv[1], "-q") == 0) { |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 863 | return kill(1, SIGHUP); |
Eric Andersen | 730f826 | 2001-12-17 23:13:08 +0000 | [diff] [blame] | 864 | } |
Mike Frysinger | bb50fdf | 2007-12-25 04:30:14 +0000 | [diff] [blame] | 865 | |
Denis Vlasenko | 5cb54b5 | 2008-10-21 17:14:26 +0000 | [diff] [blame] | 866 | if (!DEBUG_INIT) { |
Mike Frysinger | bb50fdf | 2007-12-25 04:30:14 +0000 | [diff] [blame] | 867 | /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */ |
| 868 | if (getpid() != 1 |
| 869 | && (!ENABLE_FEATURE_INITRD || !strstr(applet_name, "linuxrc")) |
| 870 | ) { |
| 871 | bb_show_usage(); |
| 872 | } |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 873 | /* Turn off rebooting via CTL-ALT-DEL - we get a |
Mike Frysinger | bb50fdf | 2007-12-25 04:30:14 +0000 | [diff] [blame] | 874 | * SIGINT on CAD so we can shut things down gracefully... */ |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 875 | reboot(RB_DISABLE_CAD); /* misnomer */ |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 876 | } |
Denis Vlasenko | d8540f7 | 2007-06-14 07:53:06 +0000 | [diff] [blame] | 877 | |
Eric Andersen | 599e3ce | 2002-07-03 11:08:10 +0000 | [diff] [blame] | 878 | /* Figure out where the default console should be */ |
| 879 | console_init(); |
Denis Vlasenko | d238a47 | 2007-03-05 19:22:04 +0000 | [diff] [blame] | 880 | set_sane_term(); |
Bernhard Reutner-Fischer | 54d50a0 | 2008-07-17 14:00:42 +0000 | [diff] [blame] | 881 | xchdir("/"); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 882 | setsid(); |
Denis Vlasenko | b8d1a4c | 2008-09-20 16:28:59 +0000 | [diff] [blame] | 883 | |
| 884 | /* Make sure environs is set to something sane */ |
| 885 | putenv((char *) "HOME=/"); |
| 886 | putenv((char *) bb_PATH_root_path); |
| 887 | putenv((char *) "SHELL=/bin/sh"); |
| 888 | putenv((char *) "USER=root"); /* needed? why? */ |
Rob Landley | cba1b96 | 2006-07-09 17:28:17 +0000 | [diff] [blame] | 889 | |
Bernhard Reutner-Fischer | 54d50a0 | 2008-07-17 14:00:42 +0000 | [diff] [blame] | 890 | if (argv[1]) |
Denis Vlasenko | b8d1a4c | 2008-09-20 16:28:59 +0000 | [diff] [blame] | 891 | xsetenv("RUNLEVEL", argv[1]); |
Rob Landley | cba1b96 | 2006-07-09 17:28:17 +0000 | [diff] [blame] | 892 | |
Denys Vlasenko | d7171c1 | 2009-12-15 00:34:59 +0100 | [diff] [blame] | 893 | #if !ENABLE_FEATURE_EXTRA_QUIET |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 894 | /* Hello world */ |
Denys Vlasenko | 6be918d | 2009-12-14 01:32:11 +0100 | [diff] [blame] | 895 | message(L_CONSOLE | L_LOG, "init started: %s", bb_banner); |
| 896 | #endif |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 897 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 898 | /* Make sure there is enough memory to do something useful. */ |
Rob Landley | c3386a4 | 2005-08-30 18:50:37 +0000 | [diff] [blame] | 899 | if (ENABLE_SWAPONOFF) { |
| 900 | struct sysinfo info; |
| 901 | |
Denis Vlasenko | 6c62246 | 2009-01-29 02:01:04 +0000 | [diff] [blame] | 902 | if (sysinfo(&info) == 0 |
Denys Vlasenko | 90a9904 | 2009-09-06 02:36:23 +0200 | [diff] [blame] | 903 | && (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] | 904 | ) { |
Denis Vlasenko | 7a2ca5e | 2007-02-21 00:15:20 +0000 | [diff] [blame] | 905 | message(L_CONSOLE, "Low memory, forcing swapon"); |
Rob Landley | c3386a4 | 2005-08-30 18:50:37 +0000 | [diff] [blame] | 906 | /* swapon -a requires /proc typically */ |
Denis Vlasenko | 2f0c0d0 | 2007-01-21 00:41:04 +0000 | [diff] [blame] | 907 | new_init_action(SYSINIT, "mount -t proc proc /proc", ""); |
Rob Landley | c3386a4 | 2005-08-30 18:50:37 +0000 | [diff] [blame] | 908 | /* Try to turn on swap */ |
Denis Vlasenko | 2f0c0d0 | 2007-01-21 00:41:04 +0000 | [diff] [blame] | 909 | new_init_action(SYSINIT, "swapon -a", ""); |
Rob Landley | c3386a4 | 2005-08-30 18:50:37 +0000 | [diff] [blame] | 910 | run_actions(SYSINIT); /* wait and removing */ |
| 911 | } |
| 912 | } |
Erik Andersen | 9e73725 | 2000-01-06 01:16:13 +0000 | [diff] [blame] | 913 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 914 | /* Check if we are supposed to be in single user mode */ |
Denis Vlasenko | 1d42665 | 2008-03-17 09:09:09 +0000 | [diff] [blame] | 915 | if (argv[1] |
Denys Vlasenko | 1a8de6f | 2009-12-14 03:16:28 +0100 | [diff] [blame] | 916 | && (strcmp(argv[1], "single") == 0 || strcmp(argv[1], "-s") == 0 || LONE_CHAR(argv[1], '1')) |
Denis Vlasenko | bf66fbc | 2006-12-21 13:23:14 +0000 | [diff] [blame] | 917 | ) { |
Bernhard Reutner-Fischer | 54d50a0 | 2008-07-17 14:00:42 +0000 | [diff] [blame] | 918 | /* ??? shouldn't we set RUNLEVEL="b" here? */ |
Glenn L McGrath | b4a1baa | 2003-01-13 22:09:50 +0000 | [diff] [blame] | 919 | /* Start a shell on console */ |
Glenn L McGrath | dc4e75e | 2003-09-02 02:36:18 +0000 | [diff] [blame] | 920 | new_init_action(RESPAWN, bb_default_login_shell, ""); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 921 | } else { |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 922 | /* Not in single user mode - see what inittab says */ |
Eric Andersen | 8a8fbb8 | 1999-10-26 00:18:56 +0000 | [diff] [blame] | 923 | |
Eric Andersen | bdfd0d7 | 2001-10-24 05:00:29 +0000 | [diff] [blame] | 924 | /* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined, |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 925 | * then parse_inittab() simply adds in some default |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 926 | * actions(i.e., INIT_SCRIPT and a pair |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 927 | * of "askfirst" shells */ |
| 928 | parse_inittab(); |
Eric Andersen | d00c262 | 1999-12-07 08:37:31 +0000 | [diff] [blame] | 929 | } |
Erik Andersen | 983b51b | 2000-04-04 18:14:25 +0000 | [diff] [blame] | 930 | |
Denis Vlasenko | 9b1381f | 2007-01-03 02:56:00 +0000 | [diff] [blame] | 931 | #if ENABLE_SELINUX |
Rob Landley | b3ede5a | 2006-03-27 23:09:12 +0000 | [diff] [blame] | 932 | if (getenv("SELINUX_INIT") == NULL) { |
| 933 | int enforce = 0; |
| 934 | |
Denis Vlasenko | d8540f7 | 2007-06-14 07:53:06 +0000 | [diff] [blame] | 935 | putenv((char*)"SELINUX_INIT=YES"); |
Rob Landley | b3ede5a | 2006-03-27 23:09:12 +0000 | [diff] [blame] | 936 | if (selinux_init_load_policy(&enforce) == 0) { |
Denis Vlasenko | 4921b54 | 2007-02-03 02:17:41 +0000 | [diff] [blame] | 937 | BB_EXECVP(argv[0], argv); |
Rob Landley | b3ede5a | 2006-03-27 23:09:12 +0000 | [diff] [blame] | 938 | } else if (enforce > 0) { |
| 939 | /* SELinux in enforcing mode but load_policy failed */ |
Denys Vlasenko | 6331cf0 | 2009-11-13 09:08:27 +0100 | [diff] [blame] | 940 | message(L_CONSOLE, "can't load SELinux Policy. " |
Denis Vlasenko | b716754 | 2007-02-27 19:20:00 +0000 | [diff] [blame] | 941 | "Machine is in enforcing mode. Halting now."); |
Bernhard Reutner-Fischer | 636a1f8 | 2008-05-19 09:29:47 +0000 | [diff] [blame] | 942 | exit(EXIT_FAILURE); |
Rob Landley | b3ede5a | 2006-03-27 23:09:12 +0000 | [diff] [blame] | 943 | } |
| 944 | } |
Denis Vlasenko | 6c62246 | 2009-01-29 02:01:04 +0000 | [diff] [blame] | 945 | #endif |
Rob Landley | b3ede5a | 2006-03-27 23:09:12 +0000 | [diff] [blame] | 946 | |
Denis Vlasenko | 2afabe8 | 2007-12-10 07:06:04 +0000 | [diff] [blame] | 947 | /* 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 Andersen | 219d6f5 | 1999-11-02 19:43:01 +0000 | [diff] [blame] | 952 | |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 953 | /* Set up signal handlers */ |
| 954 | if (!DEBUG_INIT) { |
| 955 | struct sigaction sa; |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 956 | |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 957 | bb_signals(0 |
| 958 | + (1 << SIGUSR1) /* halt */ |
| 959 | + (1 << SIGTERM) /* reboot */ |
| 960 | + (1 << SIGUSR2) /* poweroff */ |
| 961 | , halt_reboot_pwoff); |
| 962 | signal(SIGQUIT, restart_handler); /* re-exec another init */ |
| 963 | |
| 964 | /* Stop handler must allow only SIGCONT inside itself */ |
| 965 | memset(&sa, 0, sizeof(sa)); |
| 966 | sigfillset(&sa.sa_mask); |
| 967 | sigdelset(&sa.sa_mask, SIGCONT); |
| 968 | sa.sa_handler = stop_handler; |
| 969 | /* NB: sa_flags doesn't have SA_RESTART. |
| 970 | * It must be able to interrupt wait(). |
| 971 | */ |
| 972 | sigaction_set(SIGTSTP, &sa); /* pause */ |
| 973 | /* Does not work as intended, at least in 2.6.20. |
| 974 | * SIGSTOP is simply ignored by init: |
| 975 | */ |
| 976 | sigaction_set(SIGSTOP, &sa); /* pause */ |
| 977 | |
| 978 | /* SIGINT (Ctrl-Alt-Del) must interrupt wait(), |
| 979 | * setting handler without SA_RESTART flag. |
| 980 | */ |
| 981 | bb_signals_recursive_norestart((1 << SIGINT), record_signo); |
| 982 | } |
| 983 | |
Denys Vlasenko | 6e54249 | 2009-11-15 03:07:19 +0100 | [diff] [blame] | 984 | /* Set up "reread /etc/inittab" handler. |
| 985 | * Handler is set up without SA_RESTART, it will interrupt syscalls. |
| 986 | */ |
| 987 | if (!DEBUG_INIT && ENABLE_FEATURE_USE_INITTAB) |
| 988 | bb_signals_recursive_norestart((1 << SIGHUP), record_signo); |
| 989 | |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 990 | /* Now run everything that needs to be run */ |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 991 | /* First run the sysinit command */ |
Eric Andersen | 1644db9 | 2001-09-05 20:18:15 +0000 | [diff] [blame] | 992 | run_actions(SYSINIT); |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 993 | check_delayed_sigs(); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 994 | /* Next run anything that wants to block */ |
Eric Andersen | 1644db9 | 2001-09-05 20:18:15 +0000 | [diff] [blame] | 995 | run_actions(WAIT); |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 996 | check_delayed_sigs(); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 997 | /* Next run anything to be run only once */ |
Eric Andersen | 0298be8 | 2002-03-05 15:12:19 +0000 | [diff] [blame] | 998 | run_actions(ONCE); |
| 999 | |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 1000 | /* Now run the looping stuff for the rest of forever. |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 1001 | */ |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 1002 | while (1) { |
Denis Vlasenko | 4774179 | 2009-03-10 16:01:57 +0000 | [diff] [blame] | 1003 | int maybe_WNOHANG; |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 1004 | |
Denis Vlasenko | 4774179 | 2009-03-10 16:01:57 +0000 | [diff] [blame] | 1005 | maybe_WNOHANG = check_delayed_sigs(); |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 1006 | |
| 1007 | /* (Re)run the respawn/askfirst stuff */ |
Denis Vlasenko | ad4da98 | 2008-04-05 04:24:23 +0000 | [diff] [blame] | 1008 | run_actions(RESPAWN | ASKFIRST); |
Denis Vlasenko | 4774179 | 2009-03-10 16:01:57 +0000 | [diff] [blame] | 1009 | maybe_WNOHANG |= check_delayed_sigs(); |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 1010 | |
| 1011 | /* Don't consume all CPU time - sleep a bit */ |
Eric Andersen | 0298be8 | 2002-03-05 15:12:19 +0000 | [diff] [blame] | 1012 | sleep(1); |
Denis Vlasenko | 4774179 | 2009-03-10 16:01:57 +0000 | [diff] [blame] | 1013 | maybe_WNOHANG |= check_delayed_sigs(); |
Eric Andersen | 0298be8 | 2002-03-05 15:12:19 +0000 | [diff] [blame] | 1014 | |
Denis Vlasenko | 4774179 | 2009-03-10 16:01:57 +0000 | [diff] [blame] | 1015 | /* Wait for any child process(es) to exit. |
Denys Vlasenko | 3ed181b | 2009-07-19 14:29:18 +0200 | [diff] [blame] | 1016 | * |
| 1017 | * If check_delayed_sigs above reported that a signal |
| 1018 | * was caught, wait will be nonblocking. This ensures |
| 1019 | * that if SIGHUP has reloaded inittab, respawn and askfirst |
| 1020 | * actions will not be delayed until next child death. |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 1021 | */ |
Denis Vlasenko | 4774179 | 2009-03-10 16:01:57 +0000 | [diff] [blame] | 1022 | if (maybe_WNOHANG) |
| 1023 | maybe_WNOHANG = WNOHANG; |
| 1024 | while (1) { |
| 1025 | pid_t wpid; |
| 1026 | struct init_action *a; |
| 1027 | |
Denys Vlasenko | 3ed181b | 2009-07-19 14:29:18 +0200 | [diff] [blame] | 1028 | /* If signals happen _in_ the wait, they interrupt it, |
| 1029 | * bb_signals_recursive_norestart set them up that way |
| 1030 | */ |
Denis Vlasenko | 4774179 | 2009-03-10 16:01:57 +0000 | [diff] [blame] | 1031 | wpid = waitpid(-1, NULL, maybe_WNOHANG); |
| 1032 | if (wpid <= 0) |
| 1033 | break; |
| 1034 | |
| 1035 | a = mark_terminated(wpid); |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 1036 | if (a) { |
| 1037 | message(L_LOG, "process '%s' (pid %d) exited. " |
| 1038 | "Scheduling for restart.", |
| 1039 | a->command, wpid); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 1040 | } |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 1041 | /* See if anyone else is waiting to be reaped */ |
Denis Vlasenko | 4774179 | 2009-03-10 16:01:57 +0000 | [diff] [blame] | 1042 | maybe_WNOHANG = WNOHANG; |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 1043 | } |
Denis Vlasenko | 72c99af | 2009-01-31 01:03:45 +0000 | [diff] [blame] | 1044 | } /* while (1) */ |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 1045 | } |