[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Mini init implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
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| 6 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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| 7 | * Adjusted by so many folks, it's impossible to keep track.
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| 8 | *
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| 9 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 10 | */
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| 11 |
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[1770] | 12 | #include "libbb.h"
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[821] | 13 | #include <paths.h>
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[1770] | 14 | //#include <signal.h>
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| 15 | //#include <sys/ioctl.h>
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| 16 | //#include <sys/wait.h>
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[821] | 17 | #include <sys/reboot.h>
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| 18 |
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[1770] | 19 | #if ENABLE_FEATURE_INIT_SYSLOG
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[821] | 20 | # include <sys/syslog.h>
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| 21 | #endif
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| 22 |
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| 23 | #define INIT_BUFFS_SIZE 256
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[1770] | 24 | #define CONSOLE_NAME_SIZE 32
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| 25 | #define MAXENV 16 /* Number of env. vars */
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[821] | 26 |
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[1770] | 27 | #if ENABLE_FEATURE_INIT_COREDUMPS
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[821] | 28 | /*
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| 29 | * When a file named CORE_ENABLE_FLAG_FILE exists, setrlimit is called
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| 30 | * before processes are spawned to set core file size as unlimited.
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| 31 | * This is for debugging only. Don't use this is production, unless
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| 32 | * you want core dumps lying about....
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| 33 | */
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| 34 | #define CORE_ENABLE_FLAG_FILE "/.init_enable_core"
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| 35 | #include <sys/resource.h>
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| 36 | #endif
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| 37 |
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| 38 | #define INITTAB "/etc/inittab" /* inittab file location */
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| 39 | #ifndef INIT_SCRIPT
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| 40 | #define INIT_SCRIPT "/etc/init.d/rcS" /* Default sysinit script. */
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| 41 | #endif
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| 42 |
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| 43 | /* Allowed init action types */
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| 44 | #define SYSINIT 0x001
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| 45 | #define RESPAWN 0x002
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| 46 | #define ASKFIRST 0x004
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| 47 | #define WAIT 0x008
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| 48 | #define ONCE 0x010
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| 49 | #define CTRLALTDEL 0x020
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| 50 | #define SHUTDOWN 0x040
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| 51 | #define RESTART 0x080
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| 52 |
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| 53 | /* A mapping between "inittab" action name strings and action type codes. */
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| 54 | struct init_action_type {
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| 55 | const char *name;
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| 56 | int action;
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| 57 | };
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| 58 |
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| 59 | static const struct init_action_type actions[] = {
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| 60 | {"sysinit", SYSINIT},
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| 61 | {"respawn", RESPAWN},
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| 62 | {"askfirst", ASKFIRST},
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| 63 | {"wait", WAIT},
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| 64 | {"once", ONCE},
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| 65 | {"ctrlaltdel", CTRLALTDEL},
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| 66 | {"shutdown", SHUTDOWN},
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| 67 | {"restart", RESTART},
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| 68 | {0, 0}
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| 69 | };
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| 70 |
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| 71 | /* Set up a linked list of init_actions, to be read from inittab */
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| 72 | struct init_action {
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[1770] | 73 | struct init_action *next;
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| 74 | int action;
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[821] | 75 | pid_t pid;
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| 76 | char command[INIT_BUFFS_SIZE];
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[1770] | 77 | char terminal[CONSOLE_NAME_SIZE];
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[821] | 78 | };
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| 79 |
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| 80 | /* Static variables */
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| 81 | static struct init_action *init_action_list = NULL;
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| 82 |
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[1770] | 83 | #if !ENABLE_FEATURE_INIT_SYSLOG
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| 84 | static const char *log_console = VC_5;
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[821] | 85 | #endif
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| 86 | #if !ENABLE_DEBUG_INIT
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| 87 | static sig_atomic_t got_cont = 0;
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| 88 | #endif
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| 89 |
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| 90 | enum {
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[1770] | 91 | L_LOG = 0x1,
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| 92 | L_CONSOLE = 0x2,
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[821] | 93 |
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[1770] | 94 | #if ENABLE_FEATURE_EXTRA_QUIET
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[821] | 95 | MAYBE_CONSOLE = 0x0,
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| 96 | #else
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[1770] | 97 | MAYBE_CONSOLE = L_CONSOLE,
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[821] | 98 | #endif
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| 99 |
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| 100 | #ifndef RB_HALT_SYSTEM
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| 101 | RB_HALT_SYSTEM = 0xcdef0123, /* FIXME: this overflows enum */
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| 102 | RB_ENABLE_CAD = 0x89abcdef,
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| 103 | RB_DISABLE_CAD = 0,
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| 104 | RB_POWER_OFF = 0x4321fedc,
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| 105 | RB_AUTOBOOT = 0x01234567,
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| 106 | #endif
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| 107 | };
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| 108 |
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[1770] | 109 | static const char *const environment[] = {
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[821] | 110 | "HOME=/",
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[1770] | 111 | bb_PATH_root_path,
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[821] | 112 | "SHELL=/bin/sh",
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| 113 | "USER=root",
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| 114 | NULL
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| 115 | };
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| 116 |
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| 117 | /* Function prototypes */
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| 118 | static void delete_init_action(struct init_action *a);
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| 119 | static int waitfor(const struct init_action *a, pid_t pid);
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| 120 | #if !ENABLE_DEBUG_INIT
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| 121 | static void shutdown_signal(int sig);
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| 122 | #endif
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| 123 |
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[1770] | 124 | #if !ENABLE_DEBUG_INIT
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[821] | 125 | static void loop_forever(void)
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| 126 | {
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| 127 | while (1)
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| 128 | sleep(1);
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| 129 | }
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[1770] | 130 | #endif
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[821] | 131 |
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| 132 | /* Print a message to the specified device.
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[1770] | 133 | * Device may be bitwise-or'd from L_LOG | L_CONSOLE */
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[821] | 134 | #if ENABLE_DEBUG_INIT
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| 135 | #define messageD message
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| 136 | #else
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[1770] | 137 | #define messageD(...) do {} while (0)
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[821] | 138 | #endif
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| 139 | static void message(int device, const char *fmt, ...)
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| 140 | __attribute__ ((format(printf, 2, 3)));
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| 141 | static void message(int device, const char *fmt, ...)
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| 142 | {
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[1770] | 143 | #if !ENABLE_FEATURE_INIT_SYSLOG
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[821] | 144 | static int log_fd = -1;
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| 145 | #endif
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| 146 |
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[1770] | 147 | va_list arguments;
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| 148 | int l;
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| 149 | char msg[128];
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| 150 |
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[821] | 151 | msg[0] = '\r';
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[1770] | 152 | va_start(arguments, fmt);
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| 153 | vsnprintf(msg + 1, sizeof(msg) - 2, fmt, arguments);
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| 154 | va_end(arguments);
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| 155 | msg[sizeof(msg) - 2] = '\0';
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| 156 | l = strlen(msg);
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[821] | 157 |
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[1770] | 158 | #if ENABLE_FEATURE_INIT_SYSLOG
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[821] | 159 | /* Log the message to syslogd */
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[1770] | 160 | if (device & L_LOG) {
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| 161 | /* don't out "\r" */
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| 162 | openlog(applet_name, 0, LOG_DAEMON);
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| 163 | syslog(LOG_INFO, "init: %s", msg + 1);
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[821] | 164 | closelog();
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| 165 | }
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| 166 | msg[l++] = '\n';
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[1770] | 167 | msg[l] = '\0';
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[821] | 168 | #else
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| 169 | msg[l++] = '\n';
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[1770] | 170 | msg[l] = '\0';
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[821] | 171 | /* Take full control of the log tty, and never close it.
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| 172 | * It's mine, all mine! Muhahahaha! */
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| 173 | if (log_fd < 0) {
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[1770] | 174 | if (!log_console) {
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| 175 | log_fd = 2;
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[821] | 176 | } else {
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[1770] | 177 | log_fd = device_open(log_console, O_WRONLY | O_NONBLOCK | O_NOCTTY);
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| 178 | if (log_fd < 0) {
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| 179 | bb_error_msg("can't log to %s", log_console);
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| 180 | device = L_CONSOLE;
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| 181 | } else {
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| 182 | fcntl(log_fd, F_SETFD, FD_CLOEXEC);
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| 183 | }
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[821] | 184 | }
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| 185 | }
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[1770] | 186 | if (device & L_LOG) {
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| 187 | full_write(log_fd, msg, l);
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| 188 | if (log_fd == 2)
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| 189 | return; /* don't print dup messages */
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[821] | 190 | }
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| 191 | #endif
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| 192 |
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[1770] | 193 | if (device & L_CONSOLE) {
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| 194 | /* Send console messages to console so people will see them. */
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| 195 | full_write(2, msg, l);
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[821] | 196 | }
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| 197 | }
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| 198 |
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| 199 | /* Set terminal settings to reasonable defaults */
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[1770] | 200 | static void set_sane_term(void)
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[821] | 201 | {
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| 202 | struct termios tty;
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| 203 |
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| 204 | tcgetattr(STDIN_FILENO, &tty);
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| 205 |
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| 206 | /* set control chars */
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| 207 | tty.c_cc[VINTR] = 3; /* C-c */
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| 208 | tty.c_cc[VQUIT] = 28; /* C-\ */
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| 209 | tty.c_cc[VERASE] = 127; /* C-? */
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| 210 | tty.c_cc[VKILL] = 21; /* C-u */
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| 211 | tty.c_cc[VEOF] = 4; /* C-d */
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| 212 | tty.c_cc[VSTART] = 17; /* C-q */
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| 213 | tty.c_cc[VSTOP] = 19; /* C-s */
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| 214 | tty.c_cc[VSUSP] = 26; /* C-z */
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| 215 |
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| 216 | /* use line dicipline 0 */
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| 217 | tty.c_line = 0;
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| 218 |
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| 219 | /* Make it be sane */
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| 220 | tty.c_cflag &= CBAUD | CBAUDEX | CSIZE | CSTOPB | PARENB | PARODD;
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| 221 | tty.c_cflag |= CREAD | HUPCL | CLOCAL;
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| 222 |
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| 223 | /* input modes */
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| 224 | tty.c_iflag = ICRNL | IXON | IXOFF;
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| 225 |
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| 226 | /* output modes */
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| 227 | tty.c_oflag = OPOST | ONLCR;
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| 228 |
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| 229 | /* local modes */
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| 230 | tty.c_lflag =
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| 231 | ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN;
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| 232 |
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| 233 | tcsetattr(STDIN_FILENO, TCSANOW, &tty);
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| 234 | }
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| 235 |
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[1770] | 236 | /* From <linux/serial.h> */
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| 237 | struct serial_struct {
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| 238 | int type;
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| 239 | int line;
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| 240 | unsigned int port;
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| 241 | int irq;
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| 242 | int flags;
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| 243 | int xmit_fifo_size;
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| 244 | int custom_divisor;
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| 245 | int baud_base;
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| 246 | unsigned short close_delay;
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| 247 | char io_type;
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| 248 | char reserved_char[1];
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| 249 | int hub6;
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| 250 | unsigned short closing_wait; /* time to wait before closing */
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| 251 | unsigned short closing_wait2; /* no longer used... */
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| 252 | unsigned char *iomem_base;
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| 253 | unsigned short iomem_reg_shift;
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| 254 | unsigned int port_high;
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| 255 | unsigned long iomap_base; /* cookie passed into ioremap */
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| 256 | int reserved[1];
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| 257 | /* Paranoia (imagine 64bit kernel overwriting 32bit userspace stack) */
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| 258 | uint32_t bbox_reserved[16];
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| 259 | };
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[821] | 260 | static void console_init(void)
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| 261 | {
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| 262 | struct serial_struct sr;
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| 263 | char *s;
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| 264 |
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[1770] | 265 | s = getenv("CONSOLE");
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| 266 | if (!s) s = getenv("console");
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| 267 | if (s) {
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| 268 | int fd = open(s, O_RDWR | O_NONBLOCK | O_NOCTTY);
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| 269 | if (fd >= 0) {
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| 270 | dup2(fd, 0);
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| 271 | dup2(fd, 1);
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| 272 | dup2(fd, 2);
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| 273 | while (fd > 2) close(fd--);
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| 274 | }
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| 275 | messageD(L_LOG, "console='%s'", s);
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[821] | 276 | } else {
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[1770] | 277 | /* Make sure fd 0,1,2 are not closed */
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| 278 | bb_sanitize_stdio();
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[821] | 279 | }
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| 280 |
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[1770] | 281 | s = getenv("TERM");
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| 282 | if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
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| 283 | /* Force the TERM setting to vt102 for serial console --
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| 284 | * if TERM is set to linux (the default) */
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| 285 | if (!s || strcmp(s, "linux") == 0)
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| 286 | putenv((char*)"TERM=vt102");
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| 287 | #if !ENABLE_FEATURE_INIT_SYSLOG
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| 288 | log_console = NULL;
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[821] | 289 | #endif
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[1770] | 290 | } else if (!s)
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| 291 | putenv((char*)"TERM=linux");
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[821] | 292 | }
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| 293 |
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[1770] | 294 | static void fixup_argv(char **argv)
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[821] | 295 | {
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| 296 | /* Fix up argv[0] to be certain we claim to be init */
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[1770] | 297 | strncpy(argv[0], "init", strlen(argv[0]));
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[821] | 298 |
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| 299 | /* Wipe argv[1]-argv[N] so they don't clutter the ps listing */
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[1770] | 300 | while (*++argv)
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| 301 | memset(*argv, 0, strlen(*argv));
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[821] | 302 | }
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| 303 |
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| 304 | /* Open the new terminal device */
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[1770] | 305 | static void open_stdio_to_tty(const char* tty_name, int fail)
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| 306 | {
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| 307 | /* empty tty_name means "use init's tty", else... */
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| 308 | if (tty_name[0]) {
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| 309 | int fd = device_open(tty_name, O_RDWR);
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| 310 | if (fd < 0) {
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| 311 | message(L_LOG | L_CONSOLE, "Can't open %s: %s",
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| 312 | tty_name, strerror(errno));
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| 313 | if (fail)
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| 314 | _exit(1);
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[821] | 315 | #if !ENABLE_DEBUG_INIT
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[1770] | 316 | shutdown_signal(SIGUSR1);
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[821] | 317 | #else
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[1770] | 318 | _exit(2);
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[821] | 319 | #endif
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[1770] | 320 | } else {
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| 321 | dup2(fd, 0);
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| 322 | dup2(fd, 1);
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| 323 | dup2(fd, 2);
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| 324 | if (fd > 2) close(fd);
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| 325 | }
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[821] | 326 | }
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[1770] | 327 | set_sane_term();
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[821] | 328 | }
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| 329 |
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| 330 | static pid_t run(const struct init_action *a)
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| 331 | {
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| 332 | int i;
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| 333 | pid_t pid;
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[1770] | 334 | char *s, *tmpCmd, *cmdpath;
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| 335 | char *cmd[INIT_BUFFS_SIZE];
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[821] | 336 | char buf[INIT_BUFFS_SIZE + 6]; /* INIT_BUFFS_SIZE+strlen("exec ")+1 */
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| 337 | sigset_t nmask, omask;
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| 338 |
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| 339 | /* Block sigchild while forking. */
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| 340 | sigemptyset(&nmask);
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| 341 | sigaddset(&nmask, SIGCHLD);
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| 342 | sigprocmask(SIG_BLOCK, &nmask, &omask);
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[1770] | 343 | pid = fork();
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| 344 | sigprocmask(SIG_SETMASK, &omask, NULL);
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[821] | 345 |
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[1770] | 346 | if (pid)
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| 347 | return pid;
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[821] | 348 |
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[1770] | 349 | /* Reset signal handlers that were set by the parent process */
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| 350 | signal(SIGUSR1, SIG_DFL);
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| 351 | signal(SIGUSR2, SIG_DFL);
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| 352 | signal(SIGINT, SIG_DFL);
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| 353 | signal(SIGTERM, SIG_DFL);
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| 354 | signal(SIGHUP, SIG_DFL);
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| 355 | signal(SIGQUIT, SIG_DFL);
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| 356 | signal(SIGCONT, SIG_DFL);
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| 357 | signal(SIGSTOP, SIG_DFL);
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| 358 | signal(SIGTSTP, SIG_DFL);
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[821] | 359 |
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[1770] | 360 | /* Create a new session and make ourself the process
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| 361 | * group leader */
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| 362 | setsid();
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[821] | 363 |
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[1770] | 364 | /* Open the new terminal device */
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| 365 | open_stdio_to_tty(a->terminal, 1);
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[821] | 366 |
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[1770] | 367 | /* If the init Action requires us to wait, then force the
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| 368 | * supplied terminal to be the controlling tty. */
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| 369 | if (a->action & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) {
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[821] | 370 |
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[1770] | 371 | /* Now fork off another process to just hang around */
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| 372 | if ((pid = fork()) < 0) {
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| 373 | message(L_LOG | L_CONSOLE, "Can't fork");
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| 374 | _exit(1);
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| 375 | }
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[821] | 376 |
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[1770] | 377 | if (pid > 0) {
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[821] | 378 |
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[1770] | 379 | /* We are the parent -- wait till the child is done */
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| 380 | signal(SIGINT, SIG_IGN);
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| 381 | signal(SIGTSTP, SIG_IGN);
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| 382 | signal(SIGQUIT, SIG_IGN);
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| 383 | signal(SIGCHLD, SIG_DFL);
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| 384 |
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| 385 | waitfor(NULL, pid);
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| 386 | /* See if stealing the controlling tty back is necessary */
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| 387 | if (tcgetpgrp(0) != getpid())
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| 388 | _exit(0);
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| 389 |
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| 390 | /* Use a temporary process to steal the controlling tty. */
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[821] | 391 | if ((pid = fork()) < 0) {
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[1770] | 392 | message(L_LOG | L_CONSOLE, "Can't fork");
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[821] | 393 | _exit(1);
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| 394 | }
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[1770] | 395 | if (pid == 0) {
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| 396 | setsid();
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| 397 | ioctl(0, TIOCSCTTY, 1);
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[821] | 398 | _exit(0);
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| 399 | }
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[1770] | 400 | waitfor(NULL, pid);
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| 401 | _exit(0);
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[821] | 402 | }
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| 403 |
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[1770] | 404 | /* Now fall though to actually execute things */
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| 405 | }
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| 406 |
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| 407 | /* See if any special /bin/sh requiring characters are present */
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| 408 | if (strpbrk(a->command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
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| 409 | cmd[0] = (char*)DEFAULT_SHELL;
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| 410 | cmd[1] = (char*)"-c";
|
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| 411 | cmd[2] = strcat(strcpy(buf, "exec "), a->command);
|
---|
| 412 | cmd[3] = NULL;
|
---|
| 413 | } else {
|
---|
| 414 | /* Convert command (char*) into cmd (char**, one word per string) */
|
---|
| 415 | strcpy(buf, a->command);
|
---|
| 416 | s = buf;
|
---|
| 417 | for (tmpCmd = buf, i = 0; (tmpCmd = strsep(&s, " \t")) != NULL;) {
|
---|
| 418 | if (*tmpCmd != '\0') {
|
---|
| 419 | cmd[i] = tmpCmd;
|
---|
| 420 | i++;
|
---|
[821] | 421 | }
|
---|
| 422 | }
|
---|
[1770] | 423 | cmd[i] = NULL;
|
---|
| 424 | }
|
---|
[821] | 425 |
|
---|
[1770] | 426 | cmdpath = cmd[0];
|
---|
[821] | 427 |
|
---|
[1770] | 428 | /*
|
---|
| 429 | * Interactive shells want to see a dash in argv[0]. This
|
---|
| 430 | * typically is handled by login, argv will be setup this
|
---|
| 431 | * way if a dash appears at the front of the command path
|
---|
| 432 | * (like "-/bin/sh").
|
---|
| 433 | */
|
---|
| 434 | if (*cmdpath == '-') {
|
---|
| 435 | /* skip over the dash */
|
---|
| 436 | ++cmdpath;
|
---|
[821] | 437 |
|
---|
[1770] | 438 | /* find the last component in the command pathname */
|
---|
| 439 | s = bb_get_last_path_component(cmdpath);
|
---|
[821] | 440 |
|
---|
[1770] | 441 | /* make a new argv[0] */
|
---|
| 442 | if ((cmd[0] = malloc(strlen(s) + 2)) == NULL) {
|
---|
| 443 | message(L_LOG | L_CONSOLE, bb_msg_memory_exhausted);
|
---|
| 444 | cmd[0] = cmdpath;
|
---|
| 445 | } else {
|
---|
| 446 | cmd[0][0] = '-';
|
---|
| 447 | strcpy(cmd[0] + 1, s);
|
---|
| 448 | }
|
---|
| 449 | #if ENABLE_FEATURE_INIT_SCTTY
|
---|
| 450 | /* Establish this process as session leader and
|
---|
| 451 | * (attempt) to make the tty (if any) a controlling tty.
|
---|
| 452 | */
|
---|
| 453 | setsid();
|
---|
| 454 | ioctl(0, TIOCSCTTY, 0 /*don't steal it*/);
|
---|
[821] | 455 | #endif
|
---|
[1770] | 456 | }
|
---|
[821] | 457 |
|
---|
| 458 | #if !defined(__UCLIBC__) || defined(__ARCH_HAS_MMU__)
|
---|
[1770] | 459 | if (a->action & ASKFIRST) {
|
---|
| 460 | static const char press_enter[] ALIGN1 =
|
---|
| 461 | #ifdef CUSTOMIZED_BANNER
|
---|
| 462 | #include CUSTOMIZED_BANNER
|
---|
[821] | 463 | #endif
|
---|
[1770] | 464 | "\nPlease press Enter to activate this console. ";
|
---|
| 465 | char c;
|
---|
| 466 | /*
|
---|
| 467 | * Save memory by not exec-ing anything large (like a shell)
|
---|
| 468 | * before the user wants it. This is critical if swap is not
|
---|
| 469 | * enabled and the system has low memory. Generally this will
|
---|
| 470 | * be run on the second virtual console, and the first will
|
---|
| 471 | * be allowed to start a shell or whatever an init script
|
---|
| 472 | * specifies.
|
---|
| 473 | */
|
---|
| 474 | messageD(L_LOG, "waiting for enter to start '%s'"
|
---|
| 475 | "(pid %d, tty '%s')\n",
|
---|
| 476 | cmdpath, getpid(), a->terminal);
|
---|
| 477 | full_write(1, press_enter, sizeof(press_enter) - 1);
|
---|
| 478 | while (read(0, &c, 1) == 1 && c != '\n')
|
---|
| 479 | ;
|
---|
| 480 | }
|
---|
| 481 | #endif
|
---|
| 482 | /* Log the process name and args */
|
---|
| 483 | message(L_LOG, "starting pid %d, tty '%s': '%s'",
|
---|
| 484 | getpid(), a->terminal, cmdpath);
|
---|
[821] | 485 |
|
---|
[1770] | 486 | #if ENABLE_FEATURE_INIT_COREDUMPS
|
---|
| 487 | {
|
---|
| 488 | struct stat sb;
|
---|
| 489 | if (stat(CORE_ENABLE_FLAG_FILE, &sb) == 0) {
|
---|
| 490 | struct rlimit limit;
|
---|
[821] | 491 |
|
---|
[1770] | 492 | limit.rlim_cur = RLIM_INFINITY;
|
---|
| 493 | limit.rlim_max = RLIM_INFINITY;
|
---|
| 494 | setrlimit(RLIMIT_CORE, &limit);
|
---|
[821] | 495 | }
|
---|
[1770] | 496 | }
|
---|
[821] | 497 | #endif
|
---|
[1770] | 498 | /* Now run it. The new program will take over this PID,
|
---|
| 499 | * so nothing further in init.c should be run. */
|
---|
| 500 | BB_EXECVP(cmdpath, cmd);
|
---|
[821] | 501 |
|
---|
[1770] | 502 | /* We're still here? Some error happened. */
|
---|
| 503 | message(L_LOG | L_CONSOLE, "Cannot run '%s': %s",
|
---|
| 504 | cmdpath, strerror(errno));
|
---|
| 505 | _exit(-1);
|
---|
[821] | 506 | }
|
---|
| 507 |
|
---|
| 508 | static int waitfor(const struct init_action *a, pid_t pid)
|
---|
| 509 | {
|
---|
| 510 | int runpid;
|
---|
| 511 | int status, wpid;
|
---|
| 512 |
|
---|
| 513 | runpid = (NULL == a)? pid : run(a);
|
---|
| 514 | while (1) {
|
---|
[1770] | 515 | wpid = waitpid(runpid, &status, 0);
|
---|
[821] | 516 | if (wpid == runpid)
|
---|
| 517 | break;
|
---|
| 518 | if (wpid == -1 && errno == ECHILD) {
|
---|
| 519 | /* we missed its termination */
|
---|
| 520 | break;
|
---|
| 521 | }
|
---|
| 522 | /* FIXME other errors should maybe trigger an error, but allow
|
---|
| 523 | * the program to continue */
|
---|
| 524 | }
|
---|
| 525 | return wpid;
|
---|
| 526 | }
|
---|
| 527 |
|
---|
| 528 | /* Run all commands of a particular type */
|
---|
| 529 | static void run_actions(int action)
|
---|
| 530 | {
|
---|
| 531 | struct init_action *a, *tmp;
|
---|
| 532 |
|
---|
| 533 | for (a = init_action_list; a; a = tmp) {
|
---|
| 534 | tmp = a->next;
|
---|
| 535 | if (a->action == action) {
|
---|
[1770] | 536 | /* a->terminal of "" means "init's console" */
|
---|
| 537 | if (a->terminal[0] && access(a->terminal, R_OK | W_OK)) {
|
---|
[821] | 538 | delete_init_action(a);
|
---|
| 539 | } else if (a->action & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) {
|
---|
| 540 | waitfor(a, 0);
|
---|
| 541 | delete_init_action(a);
|
---|
| 542 | } else if (a->action & ONCE) {
|
---|
| 543 | run(a);
|
---|
| 544 | delete_init_action(a);
|
---|
| 545 | } else if (a->action & (RESPAWN | ASKFIRST)) {
|
---|
| 546 | /* Only run stuff with pid==0. If they have
|
---|
| 547 | * a pid, that means it is still running */
|
---|
| 548 | if (a->pid == 0) {
|
---|
| 549 | a->pid = run(a);
|
---|
| 550 | }
|
---|
| 551 | }
|
---|
| 552 | }
|
---|
| 553 | }
|
---|
| 554 | }
|
---|
| 555 |
|
---|
| 556 | #if !ENABLE_DEBUG_INIT
|
---|
| 557 | static void init_reboot(unsigned long magic)
|
---|
| 558 | {
|
---|
| 559 | pid_t pid;
|
---|
| 560 | /* We have to fork here, since the kernel calls do_exit(0) in
|
---|
| 561 | * linux/kernel/sys.c, which can cause the machine to panic when
|
---|
| 562 | * the init process is killed.... */
|
---|
[1770] | 563 | pid = vfork();
|
---|
| 564 | if (pid == 0) { /* child */
|
---|
[821] | 565 | reboot(magic);
|
---|
| 566 | _exit(0);
|
---|
| 567 | }
|
---|
[1770] | 568 | waitpid(pid, NULL, 0);
|
---|
[821] | 569 | }
|
---|
| 570 |
|
---|
| 571 | static void shutdown_system(void)
|
---|
| 572 | {
|
---|
| 573 | sigset_t block_signals;
|
---|
| 574 |
|
---|
| 575 | /* run everything to be run at "shutdown". This is done _prior_
|
---|
| 576 | * to killing everything, in case people wish to use scripts to
|
---|
| 577 | * shut things down gracefully... */
|
---|
| 578 | run_actions(SHUTDOWN);
|
---|
| 579 |
|
---|
| 580 | /* first disable all our signals */
|
---|
| 581 | sigemptyset(&block_signals);
|
---|
| 582 | sigaddset(&block_signals, SIGHUP);
|
---|
| 583 | sigaddset(&block_signals, SIGQUIT);
|
---|
| 584 | sigaddset(&block_signals, SIGCHLD);
|
---|
| 585 | sigaddset(&block_signals, SIGUSR1);
|
---|
| 586 | sigaddset(&block_signals, SIGUSR2);
|
---|
| 587 | sigaddset(&block_signals, SIGINT);
|
---|
| 588 | sigaddset(&block_signals, SIGTERM);
|
---|
| 589 | sigaddset(&block_signals, SIGCONT);
|
---|
| 590 | sigaddset(&block_signals, SIGSTOP);
|
---|
| 591 | sigaddset(&block_signals, SIGTSTP);
|
---|
| 592 | sigprocmask(SIG_BLOCK, &block_signals, NULL);
|
---|
| 593 |
|
---|
[1770] | 594 | message(L_CONSOLE | L_LOG, "The system is going down NOW!");
|
---|
| 595 |
|
---|
[821] | 596 | /* Allow Ctrl-Alt-Del to reboot system. */
|
---|
| 597 | init_reboot(RB_ENABLE_CAD);
|
---|
| 598 |
|
---|
| 599 | /* Send signals to every process _except_ pid 1 */
|
---|
[1770] | 600 | message(L_CONSOLE | L_LOG, "Sending SIG%s to all processes", "TERM");
|
---|
[821] | 601 | kill(-1, SIGTERM);
|
---|
[1770] | 602 | sync();
|
---|
[821] | 603 | sleep(1);
|
---|
| 604 |
|
---|
[1770] | 605 | message(L_CONSOLE | L_LOG, "Sending SIG%s to all processes", "KILL");
|
---|
[821] | 606 | kill(-1, SIGKILL);
|
---|
[1770] | 607 | sync();
|
---|
[821] | 608 | sleep(1);
|
---|
| 609 | }
|
---|
| 610 |
|
---|
| 611 | static void exec_signal(int sig ATTRIBUTE_UNUSED)
|
---|
| 612 | {
|
---|
| 613 | struct init_action *a, *tmp;
|
---|
| 614 | sigset_t unblock_signals;
|
---|
| 615 |
|
---|
| 616 | for (a = init_action_list; a; a = tmp) {
|
---|
| 617 | tmp = a->next;
|
---|
| 618 | if (a->action & RESTART) {
|
---|
| 619 | shutdown_system();
|
---|
| 620 |
|
---|
| 621 | /* unblock all signals, blocked in shutdown_system() */
|
---|
| 622 | sigemptyset(&unblock_signals);
|
---|
| 623 | sigaddset(&unblock_signals, SIGHUP);
|
---|
| 624 | sigaddset(&unblock_signals, SIGQUIT);
|
---|
| 625 | sigaddset(&unblock_signals, SIGCHLD);
|
---|
| 626 | sigaddset(&unblock_signals, SIGUSR1);
|
---|
| 627 | sigaddset(&unblock_signals, SIGUSR2);
|
---|
| 628 | sigaddset(&unblock_signals, SIGINT);
|
---|
| 629 | sigaddset(&unblock_signals, SIGTERM);
|
---|
| 630 | sigaddset(&unblock_signals, SIGCONT);
|
---|
| 631 | sigaddset(&unblock_signals, SIGSTOP);
|
---|
| 632 | sigaddset(&unblock_signals, SIGTSTP);
|
---|
| 633 | sigprocmask(SIG_UNBLOCK, &unblock_signals, NULL);
|
---|
| 634 |
|
---|
| 635 | /* Open the new terminal device */
|
---|
[1770] | 636 | open_stdio_to_tty(a->terminal, 0);
|
---|
[821] | 637 |
|
---|
[1770] | 638 | messageD(L_CONSOLE | L_LOG, "Trying to re-exec %s", a->command);
|
---|
| 639 | BB_EXECLP(a->command, a->command, NULL);
|
---|
[821] | 640 |
|
---|
[1770] | 641 | message(L_CONSOLE | L_LOG, "Cannot run '%s': %s",
|
---|
| 642 | a->command, strerror(errno));
|
---|
[821] | 643 | sleep(2);
|
---|
| 644 | init_reboot(RB_HALT_SYSTEM);
|
---|
| 645 | loop_forever();
|
---|
| 646 | }
|
---|
| 647 | }
|
---|
| 648 | }
|
---|
| 649 |
|
---|
| 650 | static void shutdown_signal(int sig)
|
---|
| 651 | {
|
---|
[1770] | 652 | const char *m;
|
---|
[821] | 653 | int rb;
|
---|
| 654 |
|
---|
| 655 | shutdown_system();
|
---|
| 656 |
|
---|
[1770] | 657 | m = "halt";
|
---|
| 658 | rb = RB_HALT_SYSTEM;
|
---|
[821] | 659 | if (sig == SIGTERM) {
|
---|
| 660 | m = "reboot";
|
---|
| 661 | rb = RB_AUTOBOOT;
|
---|
| 662 | } else if (sig == SIGUSR2) {
|
---|
| 663 | m = "poweroff";
|
---|
| 664 | rb = RB_POWER_OFF;
|
---|
| 665 | }
|
---|
[1770] | 666 | message(L_CONSOLE | L_LOG, "Requesting system %s", m);
|
---|
[821] | 667 | /* allow time for last message to reach serial console */
|
---|
| 668 | sleep(2);
|
---|
| 669 | init_reboot(rb);
|
---|
| 670 | loop_forever();
|
---|
| 671 | }
|
---|
| 672 |
|
---|
| 673 | static void ctrlaltdel_signal(int sig ATTRIBUTE_UNUSED)
|
---|
| 674 | {
|
---|
| 675 | run_actions(CTRLALTDEL);
|
---|
| 676 | }
|
---|
| 677 |
|
---|
| 678 | /* The SIGSTOP & SIGTSTP handler */
|
---|
| 679 | static void stop_handler(int sig ATTRIBUTE_UNUSED)
|
---|
| 680 | {
|
---|
| 681 | int saved_errno = errno;
|
---|
| 682 |
|
---|
| 683 | got_cont = 0;
|
---|
| 684 | while (!got_cont)
|
---|
| 685 | pause();
|
---|
| 686 | got_cont = 0;
|
---|
| 687 | errno = saved_errno;
|
---|
| 688 | }
|
---|
| 689 |
|
---|
| 690 | /* The SIGCONT handler */
|
---|
| 691 | static void cont_handler(int sig ATTRIBUTE_UNUSED)
|
---|
| 692 | {
|
---|
| 693 | got_cont = 1;
|
---|
| 694 | }
|
---|
| 695 |
|
---|
[1770] | 696 | #endif /* !ENABLE_DEBUG_INIT */
|
---|
[821] | 697 |
|
---|
| 698 | static void new_init_action(int action, const char *command, const char *cons)
|
---|
| 699 | {
|
---|
| 700 | struct init_action *new_action, *a, *last;
|
---|
| 701 |
|
---|
| 702 | if (strcmp(cons, bb_dev_null) == 0 && (action & ASKFIRST))
|
---|
| 703 | return;
|
---|
| 704 |
|
---|
| 705 | /* Append to the end of the list */
|
---|
| 706 | for (a = last = init_action_list; a; a = a->next) {
|
---|
| 707 | /* don't enter action if it's already in the list,
|
---|
| 708 | * but do overwrite existing actions */
|
---|
[1770] | 709 | if ((strcmp(a->command, command) == 0)
|
---|
| 710 | && (strcmp(a->terminal, cons) == 0)
|
---|
| 711 | ) {
|
---|
[821] | 712 | a->action = action;
|
---|
| 713 | return;
|
---|
| 714 | }
|
---|
| 715 | last = a;
|
---|
| 716 | }
|
---|
[1770] | 717 |
|
---|
| 718 | new_action = xzalloc(sizeof(struct init_action));
|
---|
[821] | 719 | if (last) {
|
---|
| 720 | last->next = new_action;
|
---|
| 721 | } else {
|
---|
| 722 | init_action_list = new_action;
|
---|
| 723 | }
|
---|
| 724 | strcpy(new_action->command, command);
|
---|
| 725 | new_action->action = action;
|
---|
| 726 | strcpy(new_action->terminal, cons);
|
---|
[1770] | 727 | messageD(L_LOG | L_CONSOLE, "command='%s' action=%d tty='%s'\n",
|
---|
[821] | 728 | new_action->command, new_action->action, new_action->terminal);
|
---|
| 729 | }
|
---|
| 730 |
|
---|
| 731 | static void delete_init_action(struct init_action *action)
|
---|
| 732 | {
|
---|
| 733 | struct init_action *a, *b = NULL;
|
---|
| 734 |
|
---|
| 735 | for (a = init_action_list; a; b = a, a = a->next) {
|
---|
| 736 | if (a == action) {
|
---|
| 737 | if (b == NULL) {
|
---|
| 738 | init_action_list = a->next;
|
---|
| 739 | } else {
|
---|
| 740 | b->next = a->next;
|
---|
| 741 | }
|
---|
| 742 | free(a);
|
---|
| 743 | break;
|
---|
| 744 | }
|
---|
| 745 | }
|
---|
| 746 | }
|
---|
| 747 |
|
---|
| 748 | /* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined,
|
---|
| 749 | * then parse_inittab() simply adds in some default
|
---|
| 750 | * actions(i.e., runs INIT_SCRIPT and then starts a pair
|
---|
| 751 | * of "askfirst" shells). If CONFIG_FEATURE_USE_INITTAB
|
---|
| 752 | * _is_ defined, but /etc/inittab is missing, this
|
---|
| 753 | * results in the same set of default behaviors.
|
---|
| 754 | */
|
---|
| 755 | static void parse_inittab(void)
|
---|
| 756 | {
|
---|
[1770] | 757 | #if ENABLE_FEATURE_USE_INITTAB
|
---|
[821] | 758 | FILE *file;
|
---|
| 759 | char buf[INIT_BUFFS_SIZE], lineAsRead[INIT_BUFFS_SIZE];
|
---|
[1770] | 760 | char tmpConsole[CONSOLE_NAME_SIZE];
|
---|
[821] | 761 | char *id, *runlev, *action, *command, *eol;
|
---|
| 762 | const struct init_action_type *a = actions;
|
---|
| 763 |
|
---|
| 764 | file = fopen(INITTAB, "r");
|
---|
| 765 | if (file == NULL) {
|
---|
| 766 | /* No inittab file -- set up some default behavior */
|
---|
| 767 | #endif
|
---|
| 768 | /* Reboot on Ctrl-Alt-Del */
|
---|
[1770] | 769 | new_init_action(CTRLALTDEL, "reboot", "");
|
---|
[821] | 770 | /* Umount all filesystems on halt/reboot */
|
---|
[1770] | 771 | new_init_action(SHUTDOWN, "umount -a -r", "");
|
---|
[821] | 772 | /* Swapoff on halt/reboot */
|
---|
[1770] | 773 | if (ENABLE_SWAPONOFF) new_init_action(SHUTDOWN, "swapoff -a", "");
|
---|
[821] | 774 | /* Prepare to restart init when a HUP is received */
|
---|
[1770] | 775 | new_init_action(RESTART, "init", "");
|
---|
[821] | 776 | /* Askfirst shell on tty1-4 */
|
---|
| 777 | new_init_action(ASKFIRST, bb_default_login_shell, "");
|
---|
| 778 | new_init_action(ASKFIRST, bb_default_login_shell, VC_2);
|
---|
| 779 | new_init_action(ASKFIRST, bb_default_login_shell, VC_3);
|
---|
| 780 | new_init_action(ASKFIRST, bb_default_login_shell, VC_4);
|
---|
| 781 | /* sysinit */
|
---|
| 782 | new_init_action(SYSINIT, INIT_SCRIPT, "");
|
---|
| 783 |
|
---|
| 784 | return;
|
---|
[1770] | 785 | #if ENABLE_FEATURE_USE_INITTAB
|
---|
[821] | 786 | }
|
---|
| 787 |
|
---|
| 788 | while (fgets(buf, INIT_BUFFS_SIZE, file) != NULL) {
|
---|
| 789 | /* Skip leading spaces */
|
---|
| 790 | for (id = buf; *id == ' ' || *id == '\t'; id++);
|
---|
| 791 |
|
---|
| 792 | /* Skip the line if it's a comment */
|
---|
| 793 | if (*id == '#' || *id == '\n')
|
---|
| 794 | continue;
|
---|
| 795 |
|
---|
| 796 | /* Trim the trailing \n */
|
---|
[1770] | 797 | //XXX: chomp() ?
|
---|
[821] | 798 | eol = strrchr(id, '\n');
|
---|
| 799 | if (eol != NULL)
|
---|
| 800 | *eol = '\0';
|
---|
| 801 |
|
---|
| 802 | /* Keep a copy around for posterity's sake (and error msgs) */
|
---|
| 803 | strcpy(lineAsRead, buf);
|
---|
| 804 |
|
---|
| 805 | /* Separate the ID field from the runlevels */
|
---|
| 806 | runlev = strchr(id, ':');
|
---|
| 807 | if (runlev == NULL || *(runlev + 1) == '\0') {
|
---|
[1770] | 808 | message(L_LOG | L_CONSOLE, "Bad inittab entry: %s", lineAsRead);
|
---|
[821] | 809 | continue;
|
---|
| 810 | } else {
|
---|
| 811 | *runlev = '\0';
|
---|
| 812 | ++runlev;
|
---|
| 813 | }
|
---|
| 814 |
|
---|
| 815 | /* Separate the runlevels from the action */
|
---|
| 816 | action = strchr(runlev, ':');
|
---|
| 817 | if (action == NULL || *(action + 1) == '\0') {
|
---|
[1770] | 818 | message(L_LOG | L_CONSOLE, "Bad inittab entry: %s", lineAsRead);
|
---|
[821] | 819 | continue;
|
---|
| 820 | } else {
|
---|
| 821 | *action = '\0';
|
---|
| 822 | ++action;
|
---|
| 823 | }
|
---|
| 824 |
|
---|
| 825 | /* Separate the action from the command */
|
---|
| 826 | command = strchr(action, ':');
|
---|
| 827 | if (command == NULL || *(command + 1) == '\0') {
|
---|
[1770] | 828 | message(L_LOG | L_CONSOLE, "Bad inittab entry: %s", lineAsRead);
|
---|
[821] | 829 | continue;
|
---|
| 830 | } else {
|
---|
| 831 | *command = '\0';
|
---|
| 832 | ++command;
|
---|
| 833 | }
|
---|
| 834 |
|
---|
| 835 | /* Ok, now process it */
|
---|
| 836 | for (a = actions; a->name != 0; a++) {
|
---|
| 837 | if (strcmp(a->name, action) == 0) {
|
---|
| 838 | if (*id != '\0') {
|
---|
[1770] | 839 | if (strncmp(id, "/dev/", 5) == 0)
|
---|
[821] | 840 | id += 5;
|
---|
| 841 | strcpy(tmpConsole, "/dev/");
|
---|
| 842 | safe_strncpy(tmpConsole + 5, id,
|
---|
[1770] | 843 | sizeof(tmpConsole) - 5);
|
---|
[821] | 844 | id = tmpConsole;
|
---|
| 845 | }
|
---|
| 846 | new_init_action(a->action, command, id);
|
---|
| 847 | break;
|
---|
| 848 | }
|
---|
| 849 | }
|
---|
| 850 | if (a->name == 0) {
|
---|
| 851 | /* Choke on an unknown action */
|
---|
[1770] | 852 | message(L_LOG | L_CONSOLE, "Bad inittab entry: %s", lineAsRead);
|
---|
[821] | 853 | }
|
---|
| 854 | }
|
---|
| 855 | fclose(file);
|
---|
[1770] | 856 | #endif /* FEATURE_USE_INITTAB */
|
---|
[821] | 857 | }
|
---|
| 858 |
|
---|
[1770] | 859 | #if ENABLE_FEATURE_USE_INITTAB
|
---|
[821] | 860 | static void reload_signal(int sig ATTRIBUTE_UNUSED)
|
---|
| 861 | {
|
---|
| 862 | struct init_action *a, *tmp;
|
---|
| 863 |
|
---|
[1770] | 864 | message(L_LOG, "reloading /etc/inittab");
|
---|
[821] | 865 |
|
---|
| 866 | /* disable old entrys */
|
---|
| 867 | for (a = init_action_list; a; a = a->next ) {
|
---|
| 868 | a->action = ONCE;
|
---|
| 869 | }
|
---|
| 870 |
|
---|
| 871 | parse_inittab();
|
---|
| 872 |
|
---|
| 873 | /* remove unused entrys */
|
---|
| 874 | for (a = init_action_list; a; a = tmp) {
|
---|
| 875 | tmp = a->next;
|
---|
[1770] | 876 | if ((a->action & (ONCE | SYSINIT | WAIT)) && a->pid == 0) {
|
---|
[821] | 877 | delete_init_action(a);
|
---|
| 878 | }
|
---|
| 879 | }
|
---|
| 880 | run_actions(RESPAWN);
|
---|
| 881 | }
|
---|
[1770] | 882 | #endif /* FEATURE_USE_INITTAB */
|
---|
[821] | 883 |
|
---|
[1770] | 884 | int init_main(int argc, char **argv);
|
---|
[821] | 885 | int init_main(int argc, char **argv)
|
---|
| 886 | {
|
---|
| 887 | struct init_action *a;
|
---|
| 888 | pid_t wpid;
|
---|
| 889 |
|
---|
[1770] | 890 | die_sleep = 30 * 24*60*60; /* if xmalloc will ever die... */
|
---|
| 891 |
|
---|
[821] | 892 | if (argc > 1 && !strcmp(argv[1], "-q")) {
|
---|
[1770] | 893 | return kill(1, SIGHUP);
|
---|
[821] | 894 | }
|
---|
| 895 | #if !ENABLE_DEBUG_INIT
|
---|
| 896 | /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
|
---|
[1770] | 897 | if (getpid() != 1
|
---|
| 898 | && (!ENABLE_FEATURE_INITRD || !strstr(applet_name, "linuxrc"))
|
---|
| 899 | ) {
|
---|
[821] | 900 | bb_show_usage();
|
---|
| 901 | }
|
---|
| 902 | /* Set up sig handlers -- be sure to
|
---|
| 903 | * clear all of these in run() */
|
---|
| 904 | signal(SIGHUP, exec_signal);
|
---|
| 905 | signal(SIGQUIT, exec_signal);
|
---|
| 906 | signal(SIGUSR1, shutdown_signal);
|
---|
| 907 | signal(SIGUSR2, shutdown_signal);
|
---|
| 908 | signal(SIGINT, ctrlaltdel_signal);
|
---|
| 909 | signal(SIGTERM, shutdown_signal);
|
---|
| 910 | signal(SIGCONT, cont_handler);
|
---|
| 911 | signal(SIGSTOP, stop_handler);
|
---|
| 912 | signal(SIGTSTP, stop_handler);
|
---|
| 913 |
|
---|
| 914 | /* Turn off rebooting via CTL-ALT-DEL -- we get a
|
---|
| 915 | * SIGINT on CAD so we can shut things down gracefully... */
|
---|
| 916 | init_reboot(RB_DISABLE_CAD);
|
---|
| 917 | #endif
|
---|
| 918 |
|
---|
[1770] | 919 |
|
---|
[821] | 920 | /* Figure out where the default console should be */
|
---|
| 921 | console_init();
|
---|
[1770] | 922 | set_sane_term();
|
---|
[821] | 923 | chdir("/");
|
---|
| 924 | setsid();
|
---|
| 925 | {
|
---|
[1770] | 926 | const char *const *e;
|
---|
[821] | 927 | /* Make sure environs is set to something sane */
|
---|
[1770] | 928 | for (e = environment; *e; e++)
|
---|
[821] | 929 | putenv((char *) *e);
|
---|
| 930 | }
|
---|
[1770] | 931 |
|
---|
| 932 | if (argc > 1) setenv("RUNLEVEL", argv[1], 1);
|
---|
| 933 |
|
---|
[821] | 934 | /* Hello world */
|
---|
[1770] | 935 | message(MAYBE_CONSOLE | L_LOG, "init started: %s", bb_banner);
|
---|
[821] | 936 |
|
---|
| 937 | /* Make sure there is enough memory to do something useful. */
|
---|
| 938 | if (ENABLE_SWAPONOFF) {
|
---|
| 939 | struct sysinfo info;
|
---|
| 940 |
|
---|
| 941 | if (!sysinfo(&info) &&
|
---|
[1770] | 942 | (info.mem_unit ? : 1) * (long long)info.totalram < 1024*1024)
|
---|
[821] | 943 | {
|
---|
[1770] | 944 | message(L_CONSOLE, "Low memory, forcing swapon");
|
---|
[821] | 945 | /* swapon -a requires /proc typically */
|
---|
[1770] | 946 | new_init_action(SYSINIT, "mount -t proc proc /proc", "");
|
---|
[821] | 947 | /* Try to turn on swap */
|
---|
[1770] | 948 | new_init_action(SYSINIT, "swapon -a", "");
|
---|
[821] | 949 | run_actions(SYSINIT); /* wait and removing */
|
---|
| 950 | }
|
---|
| 951 | }
|
---|
| 952 |
|
---|
| 953 | /* Check if we are supposed to be in single user mode */
|
---|
[1770] | 954 | if (argc > 1
|
---|
| 955 | && (!strcmp(argv[1], "single") || !strcmp(argv[1], "-s") || LONE_CHAR(argv[1], '1'))
|
---|
| 956 | ) {
|
---|
[821] | 957 | /* Start a shell on console */
|
---|
| 958 | new_init_action(RESPAWN, bb_default_login_shell, "");
|
---|
| 959 | } else {
|
---|
| 960 | /* Not in single user mode -- see what inittab says */
|
---|
| 961 |
|
---|
| 962 | /* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined,
|
---|
| 963 | * then parse_inittab() simply adds in some default
|
---|
| 964 | * actions(i.e., runs INIT_SCRIPT and then starts a pair
|
---|
| 965 | * of "askfirst" shells */
|
---|
| 966 | parse_inittab();
|
---|
| 967 | }
|
---|
| 968 |
|
---|
[1770] | 969 | #if ENABLE_SELINUX
|
---|
[821] | 970 | if (getenv("SELINUX_INIT") == NULL) {
|
---|
| 971 | int enforce = 0;
|
---|
| 972 |
|
---|
[1770] | 973 | putenv((char*)"SELINUX_INIT=YES");
|
---|
[821] | 974 | if (selinux_init_load_policy(&enforce) == 0) {
|
---|
[1770] | 975 | BB_EXECVP(argv[0], argv);
|
---|
[821] | 976 | } else if (enforce > 0) {
|
---|
| 977 | /* SELinux in enforcing mode but load_policy failed */
|
---|
| 978 | /* At this point, we probably can't open /dev/console, so log() won't work */
|
---|
[1770] | 979 | message(L_CONSOLE, "Cannot load SELinux Policy. "
|
---|
| 980 | "Machine is in enforcing mode. Halting now.");
|
---|
[821] | 981 | exit(1);
|
---|
| 982 | }
|
---|
| 983 | }
|
---|
| 984 | #endif /* CONFIG_SELINUX */
|
---|
| 985 |
|
---|
| 986 | /* Make the command line just say "init" -- thats all, nothing else */
|
---|
[1770] | 987 | fixup_argv(argv);
|
---|
[821] | 988 |
|
---|
| 989 | /* Now run everything that needs to be run */
|
---|
| 990 |
|
---|
| 991 | /* First run the sysinit command */
|
---|
| 992 | run_actions(SYSINIT);
|
---|
| 993 |
|
---|
| 994 | /* Next run anything that wants to block */
|
---|
| 995 | run_actions(WAIT);
|
---|
| 996 |
|
---|
| 997 | /* Next run anything to be run only once */
|
---|
| 998 | run_actions(ONCE);
|
---|
| 999 |
|
---|
[1770] | 1000 | #if ENABLE_FEATURE_USE_INITTAB
|
---|
[821] | 1001 | /* Redefine SIGHUP to reread /etc/inittab */
|
---|
| 1002 | signal(SIGHUP, reload_signal);
|
---|
| 1003 | #else
|
---|
| 1004 | signal(SIGHUP, SIG_IGN);
|
---|
[1770] | 1005 | #endif /* FEATURE_USE_INITTAB */
|
---|
[821] | 1006 |
|
---|
| 1007 | /* Now run the looping stuff for the rest of forever */
|
---|
| 1008 | while (1) {
|
---|
| 1009 | /* run the respawn stuff */
|
---|
| 1010 | run_actions(RESPAWN);
|
---|
| 1011 |
|
---|
| 1012 | /* run the askfirst stuff */
|
---|
| 1013 | run_actions(ASKFIRST);
|
---|
| 1014 |
|
---|
| 1015 | /* Don't consume all CPU time -- sleep a bit */
|
---|
| 1016 | sleep(1);
|
---|
| 1017 |
|
---|
| 1018 | /* Wait for a child process to exit */
|
---|
| 1019 | wpid = wait(NULL);
|
---|
| 1020 | while (wpid > 0) {
|
---|
| 1021 | /* Find out who died and clean up their corpse */
|
---|
| 1022 | for (a = init_action_list; a; a = a->next) {
|
---|
| 1023 | if (a->pid == wpid) {
|
---|
| 1024 | /* Set the pid to 0 so that the process gets
|
---|
| 1025 | * restarted by run_actions() */
|
---|
| 1026 | a->pid = 0;
|
---|
[1770] | 1027 | message(L_LOG, "process '%s' (pid %d) exited. "
|
---|
[821] | 1028 | "Scheduling it for restart.",
|
---|
| 1029 | a->command, wpid);
|
---|
| 1030 | }
|
---|
| 1031 | }
|
---|
| 1032 | /* see if anyone else is waiting to be reaped */
|
---|
[1770] | 1033 | wpid = waitpid(-1, NULL, WNOHANG);
|
---|
[821] | 1034 | }
|
---|
| 1035 | }
|
---|
| 1036 | }
|
---|