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 | * |
| 5 | * |
| 6 | * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>. |
| 7 | * Adjusted by so many folks, it's impossible to keep track. |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 17 | * General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with this program; if not, write to the Free Software |
| 21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 22 | * |
| 23 | */ |
| 24 | |
Erik Andersen | e132f4b | 2000-02-09 04:16:43 +0000 | [diff] [blame] | 25 | /* Turn this on to disable all the dangerous |
| 26 | rebooting stuff when debugging. |
| 27 | #define DEBUG_INIT |
| 28 | */ |
| 29 | |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 30 | #include "internal.h" |
Erik Andersen | 4f3f757 | 2000-04-28 00:18:56 +0000 | [diff] [blame] | 31 | #include <stdio.h> |
| 32 | #include <stdlib.h> |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 33 | #include <errno.h> |
Eric Andersen | b186d98 | 1999-12-03 09:19:54 +0000 | [diff] [blame] | 34 | #include <paths.h> |
Erik Andersen | 42094cd | 2000-03-20 21:34:52 +0000 | [diff] [blame] | 35 | #include <signal.h> |
| 36 | #include <stdarg.h> |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 37 | #include <string.h> |
Erik Andersen | 4f3f757 | 2000-04-28 00:18:56 +0000 | [diff] [blame] | 38 | #include <termios.h> |
| 39 | #include <unistd.h> |
Erik Andersen | 42094cd | 2000-03-20 21:34:52 +0000 | [diff] [blame] | 40 | #include <sys/fcntl.h> |
| 41 | #include <sys/ioctl.h> |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 42 | #include <sys/mount.h> |
Erik Andersen | 42094cd | 2000-03-20 21:34:52 +0000 | [diff] [blame] | 43 | #include <sys/types.h> |
Erik Andersen | 42094cd | 2000-03-20 21:34:52 +0000 | [diff] [blame] | 44 | #include <sys/wait.h> |
Erik Andersen | 4f3f757 | 2000-04-28 00:18:56 +0000 | [diff] [blame] | 45 | #ifdef BB_SYSLOGD |
| 46 | # include <sys/syslog.h> |
| 47 | #endif |
| 48 | |
Pavel Roskin | 9c5fcc3 | 2000-07-17 23:45:12 +0000 | [diff] [blame] | 49 | #define bb_need_full_version |
| 50 | #define BB_DECLARE_EXTERN |
| 51 | #include "messages.c" |
| 52 | |
Eric Andersen | bd22ed8 | 2000-07-08 18:55:24 +0000 | [diff] [blame] | 53 | /* From <linux/vt.h> */ |
| 54 | struct vt_stat { |
| 55 | unsigned short v_active; /* active vt */ |
| 56 | unsigned short v_signal; /* signal to send */ |
| 57 | unsigned short v_state; /* vt bitmask */ |
| 58 | }; |
| 59 | #define VT_GETSTATE 0x5603 /* get global vt state info */ |
| 60 | |
| 61 | /* From <linux/serial.h> */ |
| 62 | struct serial_struct { |
| 63 | int type; |
| 64 | int line; |
| 65 | int port; |
| 66 | int irq; |
| 67 | int flags; |
| 68 | int xmit_fifo_size; |
| 69 | int custom_divisor; |
| 70 | int baud_base; |
| 71 | unsigned short close_delay; |
| 72 | char reserved_char[2]; |
| 73 | int hub6; |
| 74 | unsigned short closing_wait; /* time to wait before closing */ |
| 75 | unsigned short closing_wait2; /* no longer used... */ |
| 76 | int reserved[4]; |
| 77 | }; |
| 78 | |
| 79 | |
Erik Andersen | 4f3f757 | 2000-04-28 00:18:56 +0000 | [diff] [blame] | 80 | |
| 81 | #ifndef RB_HALT_SYSTEM |
| 82 | #define RB_HALT_SYSTEM 0xcdef0123 |
| 83 | #define RB_ENABLE_CAD 0x89abcdef |
| 84 | #define RB_DISABLE_CAD 0 |
| 85 | #define RB_POWER_OFF 0x4321fedc |
| 86 | #define RB_AUTOBOOT 0x01234567 |
| 87 | #if defined(__GLIBC__) |
| 88 | #include <sys/reboot.h> |
| 89 | #define init_reboot(magic) reboot(magic) |
| 90 | #else |
| 91 | #define init_reboot(magic) reboot(0xfee1dead, 672274793, magic) |
| 92 | #endif |
| 93 | #endif |
| 94 | |
| 95 | #ifndef _PATH_STDPATH |
| 96 | #define _PATH_STDPATH "/usr/bin:/bin:/usr/sbin:/sbin" |
| 97 | #endif |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 98 | |
Erik Andersen | 983b51b | 2000-04-04 18:14:25 +0000 | [diff] [blame] | 99 | |
Erik Andersen | 183da4a | 2000-04-04 18:36:37 +0000 | [diff] [blame] | 100 | #if defined BB_FEATURE_INIT_COREDUMPS |
Erik Andersen | 983b51b | 2000-04-04 18:14:25 +0000 | [diff] [blame] | 101 | /* |
Erik Andersen | 183da4a | 2000-04-04 18:36:37 +0000 | [diff] [blame] | 102 | * When a file named CORE_ENABLE_FLAG_FILE exists, setrlimit is called |
| 103 | * before processes are spawned to set core file size as unlimited. |
| 104 | * This is for debugging only. Don't use this is production, unless |
| 105 | * you want core dumps lying about.... |
Erik Andersen | 983b51b | 2000-04-04 18:14:25 +0000 | [diff] [blame] | 106 | */ |
| 107 | #define CORE_ENABLE_FLAG_FILE "/.init_enable_core" |
| 108 | #include <sys/resource.h> |
| 109 | #include <sys/time.h> |
Erik Andersen | 183da4a | 2000-04-04 18:36:37 +0000 | [diff] [blame] | 110 | #endif |
Erik Andersen | 983b51b | 2000-04-04 18:14:25 +0000 | [diff] [blame] | 111 | |
Erik Andersen | 4d1d011 | 1999-12-17 18:44:15 +0000 | [diff] [blame] | 112 | #define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c)) |
Erik Andersen | 4d1d011 | 1999-12-17 18:44:15 +0000 | [diff] [blame] | 113 | |
Erik Andersen | 4f3f757 | 2000-04-28 00:18:56 +0000 | [diff] [blame] | 114 | #if defined(__GLIBC__) |
| 115 | #include <sys/kdaemon.h> |
| 116 | #else |
Eric Andersen | a15cd0b | 2000-06-19 18:14:20 +0000 | [diff] [blame] | 117 | static _syscall2(int, bdflush, int, func, int, data); |
Erik Andersen | 4f3f757 | 2000-04-28 00:18:56 +0000 | [diff] [blame] | 118 | #endif /* __GLIBC__ */ |
| 119 | |
Eric Andersen | 0ecb54a | 1999-12-05 23:24:55 +0000 | [diff] [blame] | 120 | |
Erik Andersen | 42094cd | 2000-03-20 21:34:52 +0000 | [diff] [blame] | 121 | #define VT_PRIMARY "/dev/tty1" /* Primary virtual console */ |
| 122 | #define VT_SECONDARY "/dev/tty2" /* Virtual console */ |
| 123 | #define VT_LOG "/dev/tty3" /* Virtual console */ |
| 124 | #define SERIAL_CON0 "/dev/ttyS0" /* Primary serial console */ |
| 125 | #define SERIAL_CON1 "/dev/ttyS1" /* Serial console */ |
| 126 | #define SHELL "/bin/sh" /* Default shell */ |
| 127 | #define INITTAB "/etc/inittab" /* inittab file location */ |
Erik Andersen | 96e2abd | 2000-01-07 11:40:44 +0000 | [diff] [blame] | 128 | #ifndef INIT_SCRIPT |
Erik Andersen | 42094cd | 2000-03-20 21:34:52 +0000 | [diff] [blame] | 129 | #define INIT_SCRIPT "/etc/init.d/rcS" /* Default sysinit script. */ |
Erik Andersen | 96e2abd | 2000-01-07 11:40:44 +0000 | [diff] [blame] | 130 | #endif |
Erik Andersen | 9c88cac | 1999-12-30 09:25:17 +0000 | [diff] [blame] | 131 | |
Erik Andersen | 42094cd | 2000-03-20 21:34:52 +0000 | [diff] [blame] | 132 | #define LOG 0x1 |
| 133 | #define CONSOLE 0x2 |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 134 | |
| 135 | /* Allowed init action types */ |
| 136 | typedef enum { |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 137 | SYSINIT = 1, |
| 138 | RESPAWN, |
| 139 | ASKFIRST, |
| 140 | WAIT, |
Erik Andersen | e132f4b | 2000-02-09 04:16:43 +0000 | [diff] [blame] | 141 | ONCE, |
| 142 | CTRLALTDEL |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 143 | } initActionEnum; |
| 144 | |
Erik Andersen | 42094cd | 2000-03-20 21:34:52 +0000 | [diff] [blame] | 145 | /* A mapping between "inittab" action name strings and action type codes. */ |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 146 | typedef struct initActionType { |
| 147 | const char *name; |
| 148 | initActionEnum action; |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 149 | } initActionType; |
| 150 | |
| 151 | static const struct initActionType actions[] = { |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 152 | {"sysinit", SYSINIT}, |
| 153 | {"respawn", RESPAWN}, |
| 154 | {"askfirst", ASKFIRST}, |
| 155 | {"wait", WAIT}, |
| 156 | {"once", ONCE}, |
Erik Andersen | e132f4b | 2000-02-09 04:16:43 +0000 | [diff] [blame] | 157 | {"ctrlaltdel", CTRLALTDEL}, |
Pavel Roskin | 9027bcf | 2000-07-14 15:44:25 +0000 | [diff] [blame] | 158 | {0, 0} |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 159 | }; |
| 160 | |
Erik Andersen | 42094cd | 2000-03-20 21:34:52 +0000 | [diff] [blame] | 161 | /* Set up a linked list of initActions, to be read from inittab */ |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 162 | typedef struct initActionTag initAction; |
| 163 | struct initActionTag { |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 164 | pid_t pid; |
| 165 | char process[256]; |
| 166 | char console[256]; |
| 167 | initAction *nextPtr; |
| 168 | initActionEnum action; |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 169 | }; |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 170 | initAction *initActionList = NULL; |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 171 | |
| 172 | |
Erik Andersen | ac6e71f | 2000-01-08 22:04:33 +0000 | [diff] [blame] | 173 | static char *secondConsole = VT_SECONDARY; |
Erik Andersen | 42094cd | 2000-03-20 21:34:52 +0000 | [diff] [blame] | 174 | static char *log = VT_LOG; |
| 175 | static int kernelVersion = 0; |
| 176 | static char termType[32] = "TERM=linux"; |
| 177 | static char console[32] = _PATH_CONSOLE; |
| 178 | |
Erik Andersen | e132f4b | 2000-02-09 04:16:43 +0000 | [diff] [blame] | 179 | static void delete_initAction(initAction * action); |
Eric Andersen | 0460ff2 | 1999-10-25 23:32:44 +0000 | [diff] [blame] | 180 | |
| 181 | |
Erik Andersen | 42094cd | 2000-03-20 21:34:52 +0000 | [diff] [blame] | 182 | /* Print a message to the specified device. |
| 183 | * Device may be bitwise-or'd from LOG | CONSOLE */ |
| 184 | static void message(int device, char *fmt, ...) |
Erik Andersen | 93d6513 | 2000-04-06 08:06:36 +0000 | [diff] [blame] | 185 | __attribute__ ((format (printf, 2, 3))); |
| 186 | static void message(int device, char *fmt, ...) |
Eric Andersen | 0460ff2 | 1999-10-25 23:32:44 +0000 | [diff] [blame] | 187 | { |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 188 | va_list arguments; |
| 189 | int fd; |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 190 | |
Eric Andersen | 4c78147 | 1999-11-26 08:12:56 +0000 | [diff] [blame] | 191 | #ifdef BB_SYSLOGD |
| 192 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 193 | /* Log the message to syslogd */ |
| 194 | if (device & LOG) { |
| 195 | char msg[1024]; |
Eric Andersen | 4c78147 | 1999-11-26 08:12:56 +0000 | [diff] [blame] | 196 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 197 | va_start(arguments, fmt); |
| 198 | vsnprintf(msg, sizeof(msg), fmt, arguments); |
| 199 | va_end(arguments); |
Erik Andersen | e132f4b | 2000-02-09 04:16:43 +0000 | [diff] [blame] | 200 | openlog("init", 0, LOG_USER); |
| 201 | syslog(LOG_USER|LOG_INFO, msg); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 202 | closelog(); |
Eric Andersen | 3ae0c78 | 1999-11-04 01:13:21 +0000 | [diff] [blame] | 203 | } |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 204 | #else |
| 205 | static int log_fd = -1; |
| 206 | |
| 207 | /* Take full control of the log tty, and never close it. |
| 208 | * It's mine, all mine! Muhahahaha! */ |
| 209 | if (log_fd < 0) { |
| 210 | if (log == NULL) { |
| 211 | /* don't even try to log, because there is no such console */ |
| 212 | log_fd = -2; |
| 213 | /* log to main console instead */ |
| 214 | device = CONSOLE; |
Erik Andersen | e132f4b | 2000-02-09 04:16:43 +0000 | [diff] [blame] | 215 | } else if ((log_fd = device_open(log, O_RDWR|O_NDELAY)) < 0) { |
| 216 | log_fd = -2; |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 217 | fprintf(stderr, "Bummer, can't write to log on %s!\r\n", log); |
| 218 | fflush(stderr); |
Erik Andersen | e132f4b | 2000-02-09 04:16:43 +0000 | [diff] [blame] | 219 | log = NULL; |
| 220 | device = CONSOLE; |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 221 | } |
| 222 | } |
| 223 | if ((device & LOG) && (log_fd >= 0)) { |
| 224 | va_start(arguments, fmt); |
| 225 | vdprintf(log_fd, fmt, arguments); |
| 226 | va_end(arguments); |
| 227 | } |
Eric Andersen | 4c78147 | 1999-11-26 08:12:56 +0000 | [diff] [blame] | 228 | #endif |
| 229 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 230 | if (device & CONSOLE) { |
| 231 | /* Always send console messages to /dev/console so people will see them. */ |
| 232 | if ( |
| 233 | (fd = |
| 234 | device_open(_PATH_CONSOLE, |
| 235 | O_WRONLY | O_NOCTTY | O_NDELAY)) >= 0) { |
| 236 | va_start(arguments, fmt); |
| 237 | vdprintf(fd, fmt, arguments); |
| 238 | va_end(arguments); |
| 239 | close(fd); |
| 240 | } else { |
| 241 | fprintf(stderr, "Bummer, can't print: "); |
| 242 | va_start(arguments, fmt); |
| 243 | vfprintf(stderr, fmt, arguments); |
| 244 | fflush(stderr); |
| 245 | va_end(arguments); |
| 246 | } |
Eric Andersen | 3ae0c78 | 1999-11-04 01:13:21 +0000 | [diff] [blame] | 247 | } |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 248 | } |
| 249 | |
Eric Andersen | 0460ff2 | 1999-10-25 23:32:44 +0000 | [diff] [blame] | 250 | /* Set terminal settings to reasonable defaults */ |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 251 | void set_term(int fd) |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 252 | { |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 253 | struct termios tty; |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 254 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 255 | tcgetattr(fd, &tty); |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 256 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 257 | /* set control chars */ |
Eric Andersen | 3849f9b | 2000-07-10 19:56:47 +0000 | [diff] [blame] | 258 | tty.c_cc[VINTR] = 3; /* C-c */ |
| 259 | tty.c_cc[VQUIT] = 28; /* C-\ */ |
| 260 | tty.c_cc[VERASE] = 127; /* C-? */ |
| 261 | tty.c_cc[VKILL] = 21; /* C-u */ |
| 262 | tty.c_cc[VEOF] = 4; /* C-d */ |
| 263 | tty.c_cc[VSTART] = 17; /* C-q */ |
| 264 | tty.c_cc[VSTOP] = 19; /* C-s */ |
| 265 | tty.c_cc[VSUSP] = 26; /* C-z */ |
Eric Andersen | 02bc25b | 2000-07-06 21:29:32 +0000 | [diff] [blame] | 266 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 267 | /* use line dicipline 0 */ |
| 268 | tty.c_line = 0; |
Eric Andersen | 7f1acfd | 1999-10-29 23:09:13 +0000 | [diff] [blame] | 269 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 270 | /* Make it be sane */ |
Erik Andersen | 6c41c44 | 2000-03-19 05:13:49 +0000 | [diff] [blame] | 271 | tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD; |
| 272 | tty.c_cflag |= HUPCL|CLOCAL; |
Eric Andersen | 08b1034 | 1999-11-19 02:38:58 +0000 | [diff] [blame] | 273 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 274 | /* input modes */ |
| 275 | tty.c_iflag = ICRNL | IXON | IXOFF; |
Eric Andersen | 08b1034 | 1999-11-19 02:38:58 +0000 | [diff] [blame] | 276 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 277 | /* output modes */ |
| 278 | tty.c_oflag = OPOST | ONLCR; |
Eric Andersen | 7f1acfd | 1999-10-29 23:09:13 +0000 | [diff] [blame] | 279 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 280 | /* local modes */ |
| 281 | tty.c_lflag = |
| 282 | ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN; |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 283 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 284 | tcsetattr(fd, TCSANOW, &tty); |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 285 | } |
| 286 | |
Eric Andersen | 219d6f5 | 1999-11-02 19:43:01 +0000 | [diff] [blame] | 287 | /* How much memory does this machine have? */ |
Erik Andersen | d07ee46 | 2000-02-21 21:26:32 +0000 | [diff] [blame] | 288 | static int check_free_memory() |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 289 | { |
Erik Andersen | d07ee46 | 2000-02-21 21:26:32 +0000 | [diff] [blame] | 290 | struct sysinfo info; |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 291 | |
Eric Andersen | 10dc9d4 | 2000-06-26 10:45:52 +0000 | [diff] [blame] | 292 | /* Pre initialize mem_unit in case this kernel is something prior to |
| 293 | * the linux 2.4 kernel (which will actually fill in mem_unit... */ |
Erik Andersen | d07ee46 | 2000-02-21 21:26:32 +0000 | [diff] [blame] | 294 | sysinfo(&info); |
| 295 | if (sysinfo(&info) != 0) { |
Eric Andersen | 10dc9d4 | 2000-06-26 10:45:52 +0000 | [diff] [blame] | 296 | printf("Error checking free memory: %s\n", strerror(errno)); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 297 | return -1; |
Eric Andersen | abc7d59 | 1999-10-19 00:27:50 +0000 | [diff] [blame] | 298 | } |
Eric Andersen | cbb61c7 | 2000-09-10 16:13:41 +0000 | [diff] [blame] | 299 | /* Kernels prior to 2.4.x will return info.mem_unit==0, so cope... */ |
Eric Andersen | 10dc9d4 | 2000-06-26 10:45:52 +0000 | [diff] [blame] | 300 | if (info.mem_unit==0) { |
Eric Andersen | cbb61c7 | 2000-09-10 16:13:41 +0000 | [diff] [blame] | 301 | info.mem_unit=1; |
Eric Andersen | 10dc9d4 | 2000-06-26 10:45:52 +0000 | [diff] [blame] | 302 | } |
Eric Andersen | cbb61c7 | 2000-09-10 16:13:41 +0000 | [diff] [blame] | 303 | info.mem_unit*=1024; |
| 304 | |
| 305 | /* Note: These values can in theory overflow a 32 bit unsigned long (i.e. |
| 306 | * mem >= Gib), but who puts more then 4GiB ram+swap on an embedded |
| 307 | * system? */ |
| 308 | info.totalram/=info.mem_unit; |
| 309 | info.totalswap/=info.mem_unit; |
Eric Andersen | 10dc9d4 | 2000-06-26 10:45:52 +0000 | [diff] [blame] | 310 | return(info.totalram+info.totalswap); |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 311 | } |
| 312 | |
Eric Andersen | 8a8fbb8 | 1999-10-26 00:18:56 +0000 | [diff] [blame] | 313 | static void console_init() |
Eric Andersen | 0460ff2 | 1999-10-25 23:32:44 +0000 | [diff] [blame] | 314 | { |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 315 | int fd; |
| 316 | int tried_devcons = 0; |
| 317 | int tried_vtprimary = 0; |
Erik Andersen | 029011b | 2000-03-04 21:19:32 +0000 | [diff] [blame] | 318 | struct vt_stat vt; |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 319 | struct serial_struct sr; |
| 320 | char *s; |
Eric Andersen | 0460ff2 | 1999-10-25 23:32:44 +0000 | [diff] [blame] | 321 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 322 | if ((s = getenv("TERM")) != NULL) { |
| 323 | snprintf(termType, sizeof(termType) - 1, "TERM=%s", s); |
| 324 | } |
Erik Andersen | ac6e71f | 2000-01-08 22:04:33 +0000 | [diff] [blame] | 325 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 326 | if ((s = getenv("CONSOLE")) != NULL) { |
| 327 | snprintf(console, sizeof(console) - 1, "%s", s); |
| 328 | } |
Eric Andersen | fbb39c8 | 1999-11-08 17:00:52 +0000 | [diff] [blame] | 329 | #if #cpu(sparc) |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 330 | /* sparc kernel supports console=tty[ab] parameter which is also |
| 331 | * passed to init, so catch it here */ |
| 332 | else if ((s = getenv("console")) != NULL) { |
| 333 | /* remap tty[ab] to /dev/ttyS[01] */ |
| 334 | if (strcmp(s, "ttya") == 0) |
| 335 | snprintf(console, sizeof(console) - 1, "%s", SERIAL_CON0); |
| 336 | else if (strcmp(s, "ttyb") == 0) |
| 337 | snprintf(console, sizeof(console) - 1, "%s", SERIAL_CON1); |
| 338 | } |
Eric Andersen | 219d6f5 | 1999-11-02 19:43:01 +0000 | [diff] [blame] | 339 | #endif |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 340 | else { |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 341 | /* 2.2 kernels: identify the real console backend and try to use it */ |
| 342 | if (ioctl(0, TIOCGSERIAL, &sr) == 0) { |
| 343 | /* this is a serial console */ |
| 344 | snprintf(console, sizeof(console) - 1, "/dev/ttyS%d", sr.line); |
| 345 | } else if (ioctl(0, VT_GETSTATE, &vt) == 0) { |
| 346 | /* this is linux virtual tty */ |
| 347 | snprintf(console, sizeof(console) - 1, "/dev/tty%d", |
| 348 | vt.v_active); |
| 349 | } else { |
| 350 | snprintf(console, sizeof(console) - 1, "%s", _PATH_CONSOLE); |
| 351 | tried_devcons++; |
| 352 | } |
Eric Andersen | 07e5297 | 1999-11-07 07:38:08 +0000 | [diff] [blame] | 353 | } |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 354 | |
| 355 | while ((fd = open(console, O_RDONLY | O_NONBLOCK)) < 0) { |
| 356 | /* Can't open selected console -- try /dev/console */ |
| 357 | if (!tried_devcons) { |
| 358 | tried_devcons++; |
| 359 | snprintf(console, sizeof(console) - 1, "%s", _PATH_CONSOLE); |
| 360 | continue; |
| 361 | } |
| 362 | /* Can't open selected console -- try vt1 */ |
| 363 | if (!tried_vtprimary) { |
| 364 | tried_vtprimary++; |
| 365 | snprintf(console, sizeof(console) - 1, "%s", VT_PRIMARY); |
| 366 | continue; |
| 367 | } |
| 368 | break; |
| 369 | } |
| 370 | if (fd < 0) { |
| 371 | /* Perhaps we should panic here? */ |
| 372 | snprintf(console, sizeof(console) - 1, "/dev/null"); |
Eric Andersen | 07e5297 | 1999-11-07 07:38:08 +0000 | [diff] [blame] | 373 | } else { |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 374 | /* check for serial console and disable logging to tty3 & running a |
| 375 | * shell to tty2 */ |
| 376 | if (ioctl(0, TIOCGSERIAL, &sr) == 0) { |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 377 | log = NULL; |
| 378 | secondConsole = NULL; |
Erik Andersen | fa4718e | 2000-02-21 19:25:12 +0000 | [diff] [blame] | 379 | /* Force the TERM setting to vt102 for serial console -- |
| 380 | * iff TERM is set to linux (the default) */ |
| 381 | if (strcmp( termType, "TERM=linux" ) == 0) |
| 382 | snprintf(termType, sizeof(termType) - 1, "TERM=vt102"); |
Erik Andersen | e132f4b | 2000-02-09 04:16:43 +0000 | [diff] [blame] | 383 | message(LOG | CONSOLE, |
| 384 | "serial console detected. Disabling virtual terminals.\r\n"); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 385 | } |
| 386 | close(fd); |
Eric Andersen | 07e5297 | 1999-11-07 07:38:08 +0000 | [diff] [blame] | 387 | } |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 388 | message(LOG, "console=%s\n", console); |
Eric Andersen | 0460ff2 | 1999-10-25 23:32:44 +0000 | [diff] [blame] | 389 | } |
| 390 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 391 | static pid_t run(char *command, char *terminal, int get_enter) |
Eric Andersen | 0460ff2 | 1999-10-25 23:32:44 +0000 | [diff] [blame] | 392 | { |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 393 | int i, fd; |
| 394 | pid_t pid; |
| 395 | char *tmpCmd; |
| 396 | char *cmd[255]; |
Erik Andersen | e132f4b | 2000-02-09 04:16:43 +0000 | [diff] [blame] | 397 | char buf[255]; |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 398 | static const char press_enter[] = |
| 399 | |
| 400 | "\nPlease press Enter to activate this console. "; |
| 401 | char *environment[] = { |
| 402 | "HOME=/", |
| 403 | "PATH=/usr/bin:/bin:/usr/sbin:/sbin", |
| 404 | "SHELL=/bin/sh", |
| 405 | termType, |
| 406 | "USER=root", |
Eric Andersen | 3639c5d | 2000-09-05 17:57:52 +0000 | [diff] [blame] | 407 | "ENV=/etc/profile", |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 408 | 0 |
| 409 | }; |
Erik Andersen | ac6e71f | 2000-01-08 22:04:33 +0000 | [diff] [blame] | 410 | |
Eric Andersen | 0460ff2 | 1999-10-25 23:32:44 +0000 | [diff] [blame] | 411 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 412 | if ((pid = fork()) == 0) { |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 413 | /* Clean up */ |
Eric Andersen | fb6a508 | 2000-09-13 16:15:29 +0000 | [diff] [blame^] | 414 | ioctl(0, TIOCNOTTY, 0); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 415 | close(0); |
| 416 | close(1); |
| 417 | close(2); |
| 418 | setsid(); |
Eric Andersen | 0460ff2 | 1999-10-25 23:32:44 +0000 | [diff] [blame] | 419 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 420 | /* Reset signal handlers set for parent process */ |
| 421 | signal(SIGUSR1, SIG_DFL); |
| 422 | signal(SIGUSR2, SIG_DFL); |
| 423 | signal(SIGINT, SIG_DFL); |
| 424 | signal(SIGTERM, SIG_DFL); |
| 425 | signal(SIGHUP, SIG_DFL); |
Eric Andersen | 2f6c04f | 1999-11-01 23:59:44 +0000 | [diff] [blame] | 426 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 427 | if ((fd = device_open(terminal, O_RDWR)) < 0) { |
| 428 | message(LOG | CONSOLE, "Bummer, can't open %s\r\n", terminal); |
| 429 | exit(1); |
| 430 | } |
| 431 | dup2(fd, 0); |
| 432 | dup2(fd, 1); |
| 433 | dup2(fd, 2); |
Eric Andersen | fb6a508 | 2000-09-13 16:15:29 +0000 | [diff] [blame^] | 434 | ioctl(0, TIOCSCTTY, 1); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 435 | tcsetpgrp(0, getpgrp()); |
| 436 | set_term(0); |
| 437 | |
| 438 | if (get_enter == TRUE) { |
| 439 | /* |
| 440 | * Save memory by not exec-ing anything large (like a shell) |
| 441 | * before the user wants it. This is critical if swap is not |
| 442 | * enabled and the system has low memory. Generally this will |
| 443 | * be run on the second virtual console, and the first will |
| 444 | * be allowed to start a shell or whatever an init script |
| 445 | * specifies. |
| 446 | */ |
| 447 | char c; |
Erik Andersen | e132f4b | 2000-02-09 04:16:43 +0000 | [diff] [blame] | 448 | #ifdef DEBUG_INIT |
Erik Andersen | 2ac2fae | 2000-03-07 23:32:17 +0000 | [diff] [blame] | 449 | pid_t shell_pgid = getpid(); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 450 | message(LOG, "Waiting for enter to start '%s' (pid %d, console %s)\r\n", |
| 451 | command, shell_pgid, terminal); |
Erik Andersen | e132f4b | 2000-02-09 04:16:43 +0000 | [diff] [blame] | 452 | #endif |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 453 | write(fileno(stdout), press_enter, sizeof(press_enter) - 1); |
| 454 | read(fileno(stdin), &c, 1); |
| 455 | } |
| 456 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 457 | #ifdef DEBUG_INIT |
Erik Andersen | e132f4b | 2000-02-09 04:16:43 +0000 | [diff] [blame] | 458 | /* Log the process name and args */ |
| 459 | message(LOG, "Starting pid %d, console %s: '%s'\r\n", |
| 460 | shell_pgid, terminal, command); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 461 | #endif |
Erik Andersen | e132f4b | 2000-02-09 04:16:43 +0000 | [diff] [blame] | 462 | |
| 463 | /* See if any special /bin/sh requiring characters are present */ |
| 464 | if (strpbrk(command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) { |
| 465 | cmd[0] = SHELL; |
| 466 | cmd[1] = "-c"; |
| 467 | strcpy(buf, "exec "); |
| 468 | strncat(buf, command, sizeof(buf) - strlen(buf) - 1); |
| 469 | cmd[2] = buf; |
| 470 | cmd[3] = NULL; |
| 471 | } else { |
| 472 | /* Convert command (char*) into cmd (char**, one word per string) */ |
| 473 | for (tmpCmd = command, i = 0; |
| 474 | (tmpCmd = strsep(&command, " \t")) != NULL;) { |
| 475 | if (*tmpCmd != '\0') { |
| 476 | cmd[i] = tmpCmd; |
| 477 | tmpCmd++; |
| 478 | i++; |
| 479 | } |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 480 | } |
Erik Andersen | e132f4b | 2000-02-09 04:16:43 +0000 | [diff] [blame] | 481 | cmd[i] = NULL; |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 482 | } |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 483 | |
Erik Andersen | 183da4a | 2000-04-04 18:36:37 +0000 | [diff] [blame] | 484 | #if defined BB_FEATURE_INIT_COREDUMPS |
Erik Andersen | 983b51b | 2000-04-04 18:14:25 +0000 | [diff] [blame] | 485 | { |
| 486 | struct stat sb; |
| 487 | if (stat (CORE_ENABLE_FLAG_FILE, &sb) == 0) { |
| 488 | struct rlimit limit; |
| 489 | limit.rlim_cur = RLIM_INFINITY; |
| 490 | limit.rlim_max = RLIM_INFINITY; |
| 491 | setrlimit(RLIMIT_CORE, &limit); |
| 492 | } |
| 493 | } |
Erik Andersen | 183da4a | 2000-04-04 18:36:37 +0000 | [diff] [blame] | 494 | #endif |
Erik Andersen | 983b51b | 2000-04-04 18:14:25 +0000 | [diff] [blame] | 495 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 496 | /* Now run it. The new program will take over this PID, |
| 497 | * so nothing further in init.c should be run. */ |
| 498 | execve(cmd[0], cmd, environment); |
| 499 | |
| 500 | /* We're still here? Some error happened. */ |
| 501 | message(LOG | CONSOLE, "Bummer, could not run '%s': %s\n", cmd[0], |
| 502 | strerror(errno)); |
| 503 | exit(-1); |
Erik Andersen | 05df239 | 2000-01-13 04:43:48 +0000 | [diff] [blame] | 504 | } |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 505 | return pid; |
Eric Andersen | 0460ff2 | 1999-10-25 23:32:44 +0000 | [diff] [blame] | 506 | } |
| 507 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 508 | static int waitfor(char *command, char *terminal, int get_enter) |
Erik Andersen | 0e3782f | 2000-01-07 02:54:55 +0000 | [diff] [blame] | 509 | { |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 510 | int status, wpid; |
| 511 | int pid = run(command, terminal, get_enter); |
Erik Andersen | 0e3782f | 2000-01-07 02:54:55 +0000 | [diff] [blame] | 512 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 513 | while (1) { |
| 514 | wpid = wait(&status); |
Erik Andersen | e132f4b | 2000-02-09 04:16:43 +0000 | [diff] [blame] | 515 | if (wpid > 0 && wpid != pid) { |
| 516 | continue; |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 517 | } |
| 518 | if (wpid == pid) |
| 519 | break; |
Erik Andersen | 0e3782f | 2000-01-07 02:54:55 +0000 | [diff] [blame] | 520 | } |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 521 | return wpid; |
Erik Andersen | 0e3782f | 2000-01-07 02:54:55 +0000 | [diff] [blame] | 522 | } |
| 523 | |
Eric Andersen | 219d6f5 | 1999-11-02 19:43:01 +0000 | [diff] [blame] | 524 | /* Make sure there is enough memory to do something useful. * |
Erik Andersen | e132f4b | 2000-02-09 04:16:43 +0000 | [diff] [blame] | 525 | * Calls "swapon -a" if needed so be sure /etc/fstab is present... */ |
Eric Andersen | 219d6f5 | 1999-11-02 19:43:01 +0000 | [diff] [blame] | 526 | static void check_memory() |
| 527 | { |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 528 | struct stat statBuf; |
Eric Andersen | 219d6f5 | 1999-11-02 19:43:01 +0000 | [diff] [blame] | 529 | |
Erik Andersen | d07ee46 | 2000-02-21 21:26:32 +0000 | [diff] [blame] | 530 | if (check_free_memory() > 1000) |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 531 | return; |
| 532 | |
| 533 | if (stat("/etc/fstab", &statBuf) == 0) { |
Erik Andersen | 61677fe | 2000-04-13 01:18:56 +0000 | [diff] [blame] | 534 | /* swapon -a requires /proc typically */ |
| 535 | waitfor("mount proc /proc -t proc", console, FALSE); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 536 | /* Try to turn on swap */ |
Erik Andersen | 61677fe | 2000-04-13 01:18:56 +0000 | [diff] [blame] | 537 | waitfor("swapon -a", console, FALSE); |
Erik Andersen | d07ee46 | 2000-02-21 21:26:32 +0000 | [diff] [blame] | 538 | if (check_free_memory() < 1000) |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 539 | goto goodnight; |
| 540 | } else |
| 541 | goto goodnight; |
Eric Andersen | 219d6f5 | 1999-11-02 19:43:01 +0000 | [diff] [blame] | 542 | return; |
| 543 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 544 | goodnight: |
| 545 | message(CONSOLE, |
| 546 | "Sorry, your computer does not have enough memory.\r\n"); |
| 547 | while (1) |
| 548 | sleep(1); |
Eric Andersen | 219d6f5 | 1999-11-02 19:43:01 +0000 | [diff] [blame] | 549 | } |
| 550 | |
Erik Andersen | e132f4b | 2000-02-09 04:16:43 +0000 | [diff] [blame] | 551 | /* Run all commands to be run right before halt/reboot */ |
| 552 | static void run_lastAction(void) |
| 553 | { |
| 554 | initAction *a; |
| 555 | for (a = initActionList; a; a = a->nextPtr) { |
| 556 | if (a->action == CTRLALTDEL) { |
| 557 | waitfor(a->process, a->console, FALSE); |
| 558 | delete_initAction(a); |
| 559 | } |
| 560 | } |
| 561 | } |
| 562 | |
| 563 | |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 564 | #ifndef DEBUG_INIT |
Eric Andersen | 8a8fbb8 | 1999-10-26 00:18:56 +0000 | [diff] [blame] | 565 | static void shutdown_system(void) |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 566 | { |
Erik Andersen | e132f4b | 2000-02-09 04:16:43 +0000 | [diff] [blame] | 567 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 568 | /* first disable our SIGHUP signal */ |
| 569 | signal(SIGHUP, SIG_DFL); |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 570 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 571 | /* Allow Ctrl-Alt-Del to reboot system. */ |
Erik Andersen | 4f3f757 | 2000-04-28 00:18:56 +0000 | [diff] [blame] | 572 | init_reboot(RB_ENABLE_CAD); |
Erik Andersen | e132f4b | 2000-02-09 04:16:43 +0000 | [diff] [blame] | 573 | |
| 574 | message(CONSOLE|LOG, "\r\nThe system is going down NOW !!\r\n"); |
Eric Andersen | cf8c9cf | 1999-11-05 00:31:46 +0000 | [diff] [blame] | 575 | sync(); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 576 | |
| 577 | /* Send signals to every process _except_ pid 1 */ |
Erik Andersen | e132f4b | 2000-02-09 04:16:43 +0000 | [diff] [blame] | 578 | message(CONSOLE|LOG, "Sending SIGTERM to all processes.\r\n"); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 579 | kill(-1, SIGTERM); |
Erik Andersen | e132f4b | 2000-02-09 04:16:43 +0000 | [diff] [blame] | 580 | sleep(1); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 581 | sync(); |
| 582 | |
Erik Andersen | e132f4b | 2000-02-09 04:16:43 +0000 | [diff] [blame] | 583 | message(CONSOLE|LOG, "Sending SIGKILL to all processes.\r\n"); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 584 | kill(-1, SIGKILL); |
Erik Andersen | e132f4b | 2000-02-09 04:16:43 +0000 | [diff] [blame] | 585 | sleep(1); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 586 | |
Erik Andersen | e132f4b | 2000-02-09 04:16:43 +0000 | [diff] [blame] | 587 | /* run everything to be run at "ctrlaltdel" */ |
| 588 | run_lastAction(); |
| 589 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 590 | sync(); |
Eric Andersen | bd22ed8 | 2000-07-08 18:55:24 +0000 | [diff] [blame] | 591 | if (kernelVersion > 0 && kernelVersion <= KERNEL_VERSION(2,2,11)) { |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 592 | /* bdflush, kupdate not needed for kernels >2.2.11 */ |
| 593 | bdflush(1, 0); |
| 594 | sync(); |
| 595 | } |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 596 | } |
| 597 | |
Eric Andersen | 8a8fbb8 | 1999-10-26 00:18:56 +0000 | [diff] [blame] | 598 | static void halt_signal(int sig) |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 599 | { |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 600 | shutdown_system(); |
Erik Andersen | e132f4b | 2000-02-09 04:16:43 +0000 | [diff] [blame] | 601 | message(CONSOLE|LOG, |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 602 | "The system is halted. Press %s or turn off power\r\n", |
| 603 | (secondConsole == NULL) /* serial console */ |
| 604 | ? "Reset" : "CTRL-ALT-DEL"); |
| 605 | sync(); |
Erik Andersen | 3fe39dc | 2000-01-25 18:13:53 +0000 | [diff] [blame] | 606 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 607 | /* allow time for last message to reach serial console */ |
Erik Andersen | e132f4b | 2000-02-09 04:16:43 +0000 | [diff] [blame] | 608 | sleep(2); |
Erik Andersen | 3fe39dc | 2000-01-25 18:13:53 +0000 | [diff] [blame] | 609 | |
Eric Andersen | bd22ed8 | 2000-07-08 18:55:24 +0000 | [diff] [blame] | 610 | if (sig == SIGUSR2 && kernelVersion >= KERNEL_VERSION(2,2,0)) |
Erik Andersen | 4f3f757 | 2000-04-28 00:18:56 +0000 | [diff] [blame] | 611 | init_reboot(RB_POWER_OFF); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 612 | else |
Erik Andersen | 4f3f757 | 2000-04-28 00:18:56 +0000 | [diff] [blame] | 613 | init_reboot(RB_HALT_SYSTEM); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 614 | exit(0); |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 615 | } |
| 616 | |
Eric Andersen | 8a8fbb8 | 1999-10-26 00:18:56 +0000 | [diff] [blame] | 617 | static void reboot_signal(int sig) |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 618 | { |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 619 | shutdown_system(); |
Erik Andersen | e132f4b | 2000-02-09 04:16:43 +0000 | [diff] [blame] | 620 | message(CONSOLE|LOG, "Please stand by while rebooting the system.\r\n"); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 621 | sync(); |
Erik Andersen | 3fe39dc | 2000-01-25 18:13:53 +0000 | [diff] [blame] | 622 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 623 | /* allow time for last message to reach serial console */ |
| 624 | sleep(2); |
Erik Andersen | 3fe39dc | 2000-01-25 18:13:53 +0000 | [diff] [blame] | 625 | |
Erik Andersen | 4f3f757 | 2000-04-28 00:18:56 +0000 | [diff] [blame] | 626 | init_reboot(RB_AUTOBOOT); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 627 | exit(0); |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 628 | } |
Eric Andersen | 8a8fbb8 | 1999-10-26 00:18:56 +0000 | [diff] [blame] | 629 | |
Erik Andersen | de55287 | 2000-01-23 01:34:05 +0000 | [diff] [blame] | 630 | #if defined BB_FEATURE_INIT_CHROOT |
Erik Andersen | d07ee46 | 2000-02-21 21:26:32 +0000 | [diff] [blame] | 631 | |
| 632 | #if ! defined BB_FEATURE_USE_PROCFS |
| 633 | #error Sorry, I depend on the /proc filesystem right now. |
| 634 | #endif |
| 635 | |
Erik Andersen | de55287 | 2000-01-23 01:34:05 +0000 | [diff] [blame] | 636 | static void check_chroot(int sig) |
| 637 | { |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 638 | char *argv_init[2] = { "init", NULL, }; |
| 639 | char *envp_init[3] = { "HOME=/", "TERM=linux", NULL, }; |
| 640 | char rootpath[256], *tc; |
| 641 | int fd; |
Erik Andersen | de55287 | 2000-01-23 01:34:05 +0000 | [diff] [blame] | 642 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 643 | if ((fd = open("/proc/sys/kernel/init-chroot", O_RDONLY)) == -1) { |
| 644 | message(CONSOLE, |
| 645 | "SIGHUP recived, but could not open proc file\r\n"); |
| 646 | sleep(2); |
| 647 | return; |
| 648 | } |
| 649 | if (read(fd, rootpath, sizeof(rootpath)) == -1) { |
| 650 | message(CONSOLE, |
| 651 | "SIGHUP recived, but could not read proc file\r\n"); |
| 652 | sleep(2); |
| 653 | return; |
| 654 | } |
| 655 | close(fd); |
| 656 | |
| 657 | if (rootpath[0] == '\0') { |
| 658 | message(CONSOLE, |
| 659 | "SIGHUP recived, but new root is not valid: %s\r\n", |
| 660 | rootpath); |
| 661 | sleep(2); |
| 662 | return; |
| 663 | } |
| 664 | |
| 665 | tc = strrchr(rootpath, '\n'); |
| 666 | *tc = '\0'; |
| 667 | |
| 668 | /* Ok, making it this far means we commit */ |
| 669 | message(CONSOLE, "Please stand by, changing root to `%s'.\r\n", |
| 670 | rootpath); |
| 671 | |
| 672 | /* kill all other programs first */ |
| 673 | message(CONSOLE, "Sending SIGTERM to all processes.\r\n"); |
| 674 | kill(-1, SIGTERM); |
Erik Andersen | de55287 | 2000-01-23 01:34:05 +0000 | [diff] [blame] | 675 | sleep(2); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 676 | sync(); |
| 677 | |
| 678 | message(CONSOLE, "Sending SIGKILL to all processes.\r\n"); |
| 679 | kill(-1, SIGKILL); |
Erik Andersen | de55287 | 2000-01-23 01:34:05 +0000 | [diff] [blame] | 680 | sleep(2); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 681 | sync(); |
| 682 | |
| 683 | /* ok, we don't need /proc anymore. we also assume that the signaling |
| 684 | * process left the rest of the filesystems alone for us */ |
| 685 | umount("/proc"); |
| 686 | |
| 687 | /* Ok, now we chroot. Hopefully we only have two things mounted, the |
| 688 | * new chroot'd mount point, and the old "/" mount. s, |
| 689 | * we go ahead and unmount the old "/". This should trigger the kernel |
| 690 | * to set things up the Right Way(tm). */ |
| 691 | |
| 692 | if (!chroot(rootpath)) |
| 693 | umount("/dev/root"); |
| 694 | |
| 695 | /* If the chroot fails, we are already too far to turn back, so we |
| 696 | * continue and hope that executing init below will revive the system */ |
| 697 | |
| 698 | /* close all of our descriptors and open new ones */ |
| 699 | close(0); |
| 700 | close(1); |
| 701 | close(2); |
| 702 | open("/dev/console", O_RDWR, 0); |
| 703 | dup(0); |
| 704 | dup(0); |
| 705 | |
| 706 | message(CONSOLE, "Executing real init...\r\n"); |
| 707 | /* execute init in the (hopefully) new root */ |
| 708 | execve("/sbin/init", argv_init, envp_init); |
| 709 | |
| 710 | message(CONSOLE, |
| 711 | "ERROR: Could not exec new init. Press %s to reboot.\r\n", |
| 712 | (secondConsole == NULL) /* serial console */ |
| 713 | ? "Reset" : "CTRL-ALT-DEL"); |
Erik Andersen | de55287 | 2000-01-23 01:34:05 +0000 | [diff] [blame] | 714 | return; |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 715 | } |
| 716 | #endif /* BB_FEATURE_INIT_CHROOT */ |
Erik Andersen | de55287 | 2000-01-23 01:34:05 +0000 | [diff] [blame] | 717 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 718 | #endif /* ! DEBUG_INIT */ |
Erik Andersen | de55287 | 2000-01-23 01:34:05 +0000 | [diff] [blame] | 719 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 720 | void new_initAction(initActionEnum action, char *process, char *cons) |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 721 | { |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 722 | initAction *newAction; |
Erik Andersen | 9e73725 | 2000-01-06 01:16:13 +0000 | [diff] [blame] | 723 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 724 | if (*cons == '\0') |
| 725 | cons = console; |
Erik Andersen | 9e73725 | 2000-01-06 01:16:13 +0000 | [diff] [blame] | 726 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 727 | /* If BusyBox detects that a serial console is in use, |
| 728 | * then entries not refering to the console or null devices will _not_ be run. |
| 729 | * The exception to this rule is the null device. |
| 730 | */ |
| 731 | if (secondConsole == NULL && strcmp(cons, console) |
| 732 | && strcmp(cons, "/dev/null")) |
| 733 | return; |
| 734 | |
| 735 | newAction = calloc((size_t) (1), sizeof(initAction)); |
| 736 | if (!newAction) { |
| 737 | message(LOG | CONSOLE, "Memory allocation failure\n"); |
| 738 | while (1) |
| 739 | sleep(1); |
| 740 | } |
| 741 | newAction->nextPtr = initActionList; |
| 742 | initActionList = newAction; |
| 743 | strncpy(newAction->process, process, 255); |
| 744 | newAction->action = action; |
| 745 | strncpy(newAction->console, cons, 255); |
| 746 | newAction->pid = 0; |
Erik Andersen | 3163821 | 2000-01-15 22:28:50 +0000 | [diff] [blame] | 747 | // message(LOG|CONSOLE, "process='%s' action='%d' console='%s'\n", |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 748 | // newAction->process, newAction->action, newAction->console); |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 749 | } |
| 750 | |
Erik Andersen | e132f4b | 2000-02-09 04:16:43 +0000 | [diff] [blame] | 751 | static void delete_initAction(initAction * action) |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 752 | { |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 753 | initAction *a, *b = NULL; |
| 754 | |
| 755 | for (a = initActionList; a; b = a, a = a->nextPtr) { |
| 756 | if (a == action) { |
| 757 | if (b == NULL) { |
| 758 | initActionList = a->nextPtr; |
| 759 | } else { |
| 760 | b->nextPtr = a->nextPtr; |
| 761 | } |
| 762 | free(a); |
| 763 | break; |
| 764 | } |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 765 | } |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 766 | } |
| 767 | |
Erik Andersen | 9e73725 | 2000-01-06 01:16:13 +0000 | [diff] [blame] | 768 | /* NOTE that if BB_FEATURE_USE_INITTAB is NOT defined, |
| 769 | * then parse_inittab() simply adds in some default |
| 770 | * actions(i.e runs INIT_SCRIPT and then starts a pair |
Erik Andersen | 812d466 | 2000-01-07 18:30:40 +0000 | [diff] [blame] | 771 | * of "askfirst" shells). If BB_FEATURE_USE_INITTAB |
| 772 | * _is_ defined, but /etc/inittab is missing, this |
| 773 | * results in the same set of default behaviors. |
Erik Andersen | 9e73725 | 2000-01-06 01:16:13 +0000 | [diff] [blame] | 774 | * */ |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 775 | void parse_inittab(void) |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 776 | { |
Erik Andersen | 9e73725 | 2000-01-06 01:16:13 +0000 | [diff] [blame] | 777 | #ifdef BB_FEATURE_USE_INITTAB |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 778 | FILE *file; |
| 779 | char buf[256], lineAsRead[256], tmpConsole[256]; |
Eric Andersen | b596636 | 2000-05-31 20:04:38 +0000 | [diff] [blame] | 780 | char *id, *runlev, *action, *process, *eol; |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 781 | const struct initActionType *a = actions; |
| 782 | int foundIt; |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 783 | |
| 784 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 785 | file = fopen(INITTAB, "r"); |
| 786 | if (file == NULL) { |
| 787 | /* No inittab file -- set up some default behavior */ |
Erik Andersen | 9e73725 | 2000-01-06 01:16:13 +0000 | [diff] [blame] | 788 | #endif |
Erik Andersen | e132f4b | 2000-02-09 04:16:43 +0000 | [diff] [blame] | 789 | /* Swapoff on halt/reboot */ |
Erik Andersen | fb1793f | 2000-02-09 16:37:08 +0000 | [diff] [blame] | 790 | new_initAction(CTRLALTDEL, "/sbin/swapoff -a > /dev/null 2>&1", console); |
Erik Andersen | e132f4b | 2000-02-09 04:16:43 +0000 | [diff] [blame] | 791 | /* Umount all filesystems on halt/reboot */ |
| 792 | new_initAction(CTRLALTDEL, "/bin/umount -a -r > /dev/null 2>&1", console); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 793 | /* Askfirst shell on tty1 */ |
| 794 | new_initAction(ASKFIRST, SHELL, console); |
| 795 | /* Askfirst shell on tty2 */ |
| 796 | if (secondConsole != NULL) |
| 797 | new_initAction(ASKFIRST, SHELL, secondConsole); |
| 798 | /* sysinit */ |
| 799 | new_initAction(SYSINIT, INIT_SCRIPT, console); |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 800 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 801 | return; |
Erik Andersen | 9e73725 | 2000-01-06 01:16:13 +0000 | [diff] [blame] | 802 | #ifdef BB_FEATURE_USE_INITTAB |
Erik Andersen | 9e73725 | 2000-01-06 01:16:13 +0000 | [diff] [blame] | 803 | } |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 804 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 805 | while (fgets(buf, 255, file) != NULL) { |
| 806 | foundIt = FALSE; |
Eric Andersen | b596636 | 2000-05-31 20:04:38 +0000 | [diff] [blame] | 807 | /* Skip leading spaces */ |
| 808 | for (id = buf; *id == ' ' || *id == '\t'; id++); |
| 809 | |
| 810 | /* Skip the line if it's a comment */ |
| 811 | if (*id == '#' || *id == '\n') |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 812 | continue; |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 813 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 814 | /* Trim the trailing \n */ |
Eric Andersen | b596636 | 2000-05-31 20:04:38 +0000 | [diff] [blame] | 815 | eol = strrchr(id, '\n'); |
| 816 | if (eol != NULL) |
| 817 | *eol = '\0'; |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 818 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 819 | /* Keep a copy around for posterity's sake (and error msgs) */ |
| 820 | strcpy(lineAsRead, buf); |
| 821 | |
Eric Andersen | b596636 | 2000-05-31 20:04:38 +0000 | [diff] [blame] | 822 | /* Separate the ID field from the runlevels */ |
| 823 | runlev = strchr(id, ':'); |
| 824 | if (runlev == NULL || *(runlev + 1) == '\0') { |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 825 | message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead); |
| 826 | continue; |
| 827 | } else { |
Eric Andersen | b596636 | 2000-05-31 20:04:38 +0000 | [diff] [blame] | 828 | *runlev = '\0'; |
| 829 | ++runlev; |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 830 | } |
| 831 | |
Eric Andersen | b596636 | 2000-05-31 20:04:38 +0000 | [diff] [blame] | 832 | /* Separate the runlevels from the action */ |
| 833 | action = strchr(runlev, ':'); |
| 834 | if (action == NULL || *(action + 1) == '\0') { |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 835 | message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead); |
| 836 | continue; |
| 837 | } else { |
Eric Andersen | b596636 | 2000-05-31 20:04:38 +0000 | [diff] [blame] | 838 | *action = '\0'; |
| 839 | ++action; |
| 840 | } |
| 841 | |
| 842 | /* Separate the action from the process */ |
| 843 | process = strchr(action, ':'); |
| 844 | if (process == NULL || *(process + 1) == '\0') { |
| 845 | message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead); |
| 846 | continue; |
| 847 | } else { |
| 848 | *process = '\0'; |
| 849 | ++process; |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 850 | } |
| 851 | |
| 852 | /* Ok, now process it */ |
| 853 | a = actions; |
| 854 | while (a->name != 0) { |
Eric Andersen | b596636 | 2000-05-31 20:04:38 +0000 | [diff] [blame] | 855 | if (strcmp(a->name, action) == 0) { |
| 856 | if (*id != '\0') { |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 857 | struct stat statBuf; |
| 858 | |
| 859 | strcpy(tmpConsole, "/dev/"); |
Eric Andersen | b596636 | 2000-05-31 20:04:38 +0000 | [diff] [blame] | 860 | strncat(tmpConsole, id, 200); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 861 | if (stat(tmpConsole, &statBuf) != 0) { |
| 862 | message(LOG | CONSOLE, |
| 863 | "device '%s' does not exist. Did you read the directions?\n", |
| 864 | tmpConsole); |
| 865 | break; |
| 866 | } |
Eric Andersen | b596636 | 2000-05-31 20:04:38 +0000 | [diff] [blame] | 867 | id = tmpConsole; |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 868 | } |
Eric Andersen | b596636 | 2000-05-31 20:04:38 +0000 | [diff] [blame] | 869 | new_initAction(a->action, process, id); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 870 | foundIt = TRUE; |
| 871 | } |
| 872 | a++; |
| 873 | } |
| 874 | if (foundIt == TRUE) |
| 875 | continue; |
| 876 | else { |
| 877 | /* Choke on an unknown action */ |
| 878 | message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead); |
| 879 | } |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 880 | } |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 881 | return; |
Erik Andersen | 42094cd | 2000-03-20 21:34:52 +0000 | [diff] [blame] | 882 | #endif /* BB_FEATURE_USE_INITTAB */ |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 883 | } |
| 884 | |
Erik Andersen | e132f4b | 2000-02-09 04:16:43 +0000 | [diff] [blame] | 885 | |
| 886 | |
Eric Andersen | 8a8fbb8 | 1999-10-26 00:18:56 +0000 | [diff] [blame] | 887 | extern int init_main(int argc, char **argv) |
Eric Andersen | 0460ff2 | 1999-10-25 23:32:44 +0000 | [diff] [blame] | 888 | { |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 889 | initAction *a; |
| 890 | pid_t wpid; |
| 891 | int status; |
Eric Andersen | 0460ff2 | 1999-10-25 23:32:44 +0000 | [diff] [blame] | 892 | |
Eric Andersen | d73dc5b | 1999-11-10 23:13:02 +0000 | [diff] [blame] | 893 | #ifndef DEBUG_INIT |
Erik Andersen | a51ecdd | 2000-02-24 18:09:58 +0000 | [diff] [blame] | 894 | /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */ |
| 895 | if (getpid() != 1 |
| 896 | #ifdef BB_FEATURE_LINUXRC |
Matt Kraai | e58771e | 2000-07-12 15:38:49 +0000 | [diff] [blame] | 897 | && strstr(applet_name, "linuxrc") == NULL |
Erik Andersen | a51ecdd | 2000-02-24 18:09:58 +0000 | [diff] [blame] | 898 | #endif |
| 899 | ) |
| 900 | { |
| 901 | usage("init\n\nInit is the parent of all processes.\n\n" |
| 902 | "This version of init is designed to be run only " |
| 903 | "by the kernel.\n"); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 904 | } |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 905 | /* Set up sig handlers -- be sure to |
| 906 | * clear all of these in run() */ |
| 907 | signal(SIGUSR1, halt_signal); |
Eric Andersen | 4c95a28 | 2000-07-07 19:30:28 +0000 | [diff] [blame] | 908 | signal(SIGUSR2, halt_signal); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 909 | signal(SIGINT, reboot_signal); |
| 910 | signal(SIGTERM, reboot_signal); |
Erik Andersen | de55287 | 2000-01-23 01:34:05 +0000 | [diff] [blame] | 911 | #if defined BB_FEATURE_INIT_CHROOT |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 912 | signal(SIGHUP, check_chroot); |
Erik Andersen | de55287 | 2000-01-23 01:34:05 +0000 | [diff] [blame] | 913 | #endif |
Eric Andersen | 0460ff2 | 1999-10-25 23:32:44 +0000 | [diff] [blame] | 914 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 915 | /* Turn off rebooting via CTL-ALT-DEL -- we get a |
| 916 | * SIGINT on CAD so we can shut things down gracefully... */ |
Erik Andersen | 4f3f757 | 2000-04-28 00:18:56 +0000 | [diff] [blame] | 917 | init_reboot(RB_DISABLE_CAD); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 918 | #endif |
Erik Andersen | 05df239 | 2000-01-13 04:43:48 +0000 | [diff] [blame] | 919 | |
Erik Andersen | 298854f | 2000-03-23 01:09:18 +0000 | [diff] [blame] | 920 | /* Figure out what kernel this is running */ |
| 921 | kernelVersion = get_kernel_revision(); |
| 922 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 923 | /* Figure out where the default console should be */ |
| 924 | console_init(); |
Eric Andersen | 0460ff2 | 1999-10-25 23:32:44 +0000 | [diff] [blame] | 925 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 926 | /* Close whatever files are open, and reset the console. */ |
| 927 | close(0); |
| 928 | close(1); |
| 929 | close(2); |
| 930 | set_term(0); |
Erik Andersen | 983b51b | 2000-04-04 18:14:25 +0000 | [diff] [blame] | 931 | chdir("/"); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 932 | setsid(); |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 933 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 934 | /* Make sure PATH is set to something sane */ |
| 935 | putenv(_PATH_STDPATH); |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 936 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 937 | /* Hello world */ |
Eric Andersen | 7f1acfd | 1999-10-29 23:09:13 +0000 | [diff] [blame] | 938 | #ifndef DEBUG_INIT |
Erik Andersen | ea6b67d | 2000-03-07 07:47:10 +0000 | [diff] [blame] | 939 | message( |
| 940 | #if ! defined BB_FEATURE_EXTRA_QUIET |
| 941 | CONSOLE| |
| 942 | #endif |
| 943 | LOG, |
Pavel Roskin | 9c5fcc3 | 2000-07-17 23:45:12 +0000 | [diff] [blame] | 944 | "init started: %s\r\n", full_version); |
Eric Andersen | 7f1acfd | 1999-10-29 23:09:13 +0000 | [diff] [blame] | 945 | #else |
Erik Andersen | ea6b67d | 2000-03-07 07:47:10 +0000 | [diff] [blame] | 946 | message( |
| 947 | #if ! defined BB_FEATURE_EXTRA_QUIET |
| 948 | CONSOLE| |
| 949 | #endif |
| 950 | LOG, |
Pavel Roskin | 9c5fcc3 | 2000-07-17 23:45:12 +0000 | [diff] [blame] | 951 | "init(%d) started: %s\r\n", getpid(), full_version); |
Eric Andersen | 7f1acfd | 1999-10-29 23:09:13 +0000 | [diff] [blame] | 952 | #endif |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 953 | |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 954 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 955 | /* Make sure there is enough memory to do something useful. */ |
| 956 | check_memory(); |
Erik Andersen | 9e73725 | 2000-01-06 01:16:13 +0000 | [diff] [blame] | 957 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 958 | /* Check if we are supposed to be in single user mode */ |
| 959 | if (argc > 1 && (!strcmp(argv[1], "single") || |
| 960 | !strcmp(argv[1], "-s") || !strcmp(argv[1], "1"))) { |
| 961 | /* Ask first then start a shell on tty2 */ |
| 962 | if (secondConsole != NULL) |
| 963 | new_initAction(ASKFIRST, SHELL, secondConsole); |
| 964 | /* Start a shell on tty1 */ |
| 965 | new_initAction(RESPAWN, SHELL, console); |
| 966 | } else { |
| 967 | /* Not in single user mode -- see what inittab says */ |
Eric Andersen | 8a8fbb8 | 1999-10-26 00:18:56 +0000 | [diff] [blame] | 968 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 969 | /* NOTE that if BB_FEATURE_USE_INITTAB is NOT defined, |
| 970 | * then parse_inittab() simply adds in some default |
| 971 | * actions(i.e runs INIT_SCRIPT and then starts a pair |
| 972 | * of "askfirst" shells */ |
| 973 | parse_inittab(); |
Eric Andersen | d00c262 | 1999-12-07 08:37:31 +0000 | [diff] [blame] | 974 | } |
Erik Andersen | 983b51b | 2000-04-04 18:14:25 +0000 | [diff] [blame] | 975 | |
Erik Andersen | e132f4b | 2000-02-09 04:16:43 +0000 | [diff] [blame] | 976 | /* Fix up argv[0] to be certain we claim to be init */ |
| 977 | strncpy(argv[0], "init", strlen(argv[0])+1); |
Erik Andersen | 07f5604 | 2000-02-09 06:05:01 +0000 | [diff] [blame] | 978 | if (argc > 1) |
| 979 | strncpy(argv[1], "\0", strlen(argv[1])+1); |
Eric Andersen | 219d6f5 | 1999-11-02 19:43:01 +0000 | [diff] [blame] | 980 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 981 | /* Now run everything that needs to be run */ |
| 982 | |
| 983 | /* First run the sysinit command */ |
| 984 | for (a = initActionList; a; a = a->nextPtr) { |
| 985 | if (a->action == SYSINIT) { |
| 986 | waitfor(a->process, a->console, FALSE); |
| 987 | /* Now remove the "sysinit" entry from the list */ |
| 988 | delete_initAction(a); |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 989 | } |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 990 | } |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 991 | /* Next run anything that wants to block */ |
| 992 | for (a = initActionList; a; a = a->nextPtr) { |
| 993 | if (a->action == WAIT) { |
| 994 | waitfor(a->process, a->console, FALSE); |
| 995 | /* Now remove the "wait" entry from the list */ |
| 996 | delete_initAction(a); |
Erik Andersen | 7dc1607 | 2000-01-04 01:10:25 +0000 | [diff] [blame] | 997 | } |
Eric Andersen | 8a8fbb8 | 1999-10-26 00:18:56 +0000 | [diff] [blame] | 998 | } |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 999 | /* Next run anything to be run only once */ |
| 1000 | for (a = initActionList; a; a = a->nextPtr) { |
| 1001 | if (a->action == ONCE) { |
| 1002 | run(a->process, a->console, FALSE); |
| 1003 | /* Now remove the "once" entry from the list */ |
| 1004 | delete_initAction(a); |
| 1005 | } |
| 1006 | } |
| 1007 | /* If there is nothing else to do, stop */ |
| 1008 | if (initActionList == NULL) { |
| 1009 | message(LOG | CONSOLE, |
| 1010 | "No more tasks for init -- sleeping forever.\n"); |
| 1011 | while (1) |
| 1012 | sleep(1); |
| 1013 | } |
| 1014 | |
| 1015 | /* Now run the looping stuff for the rest of forever */ |
| 1016 | while (1) { |
| 1017 | for (a = initActionList; a; a = a->nextPtr) { |
| 1018 | /* Only run stuff with pid==0. If they have |
| 1019 | * a pid, that means they are still running */ |
| 1020 | if (a->pid == 0) { |
| 1021 | switch (a->action) { |
| 1022 | case RESPAWN: |
| 1023 | /* run the respawn stuff */ |
| 1024 | a->pid = run(a->process, a->console, FALSE); |
| 1025 | break; |
| 1026 | case ASKFIRST: |
| 1027 | /* run the askfirst stuff */ |
| 1028 | a->pid = run(a->process, a->console, TRUE); |
| 1029 | break; |
| 1030 | /* silence the compiler's incessant whining */ |
| 1031 | default: |
| 1032 | break; |
| 1033 | } |
| 1034 | } |
| 1035 | } |
| 1036 | /* Wait for a child process to exit */ |
| 1037 | wpid = wait(&status); |
| 1038 | if (wpid > 0) { |
| 1039 | /* Find out who died and clean up their corpse */ |
| 1040 | for (a = initActionList; a; a = a->nextPtr) { |
| 1041 | if (a->pid == wpid) { |
| 1042 | a->pid = 0; |
| 1043 | message(LOG, |
| 1044 | "Process '%s' (pid %d) exited. Scheduling it for restart.\n", |
| 1045 | a->process, wpid); |
| 1046 | } |
| 1047 | } |
| 1048 | } |
| 1049 | sleep(1); |
| 1050 | } |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 1051 | } |
Erik Andersen | 029011b | 2000-03-04 21:19:32 +0000 | [diff] [blame] | 1052 | |
| 1053 | /* |
| 1054 | Local Variables: |
| 1055 | c-file-style: "linux" |
| 1056 | c-basic-offset: 4 |
| 1057 | tab-width: 4 |
| 1058 | End: |
| 1059 | */ |