static void askconsole(struct init_action *a) { char line[256], *tty, *split; int i; tty = get_cmdline_val("console", line, sizeof(line)); if (tty != NULL) { split = strchr(tty, ','); if (split != NULL) *split = '\0'; if (!dev_exist(tty)) { DEBUG(4, "skipping %s\n", tty); return; } console = strdup(tty); a->id = strdup(tty); } else { console = NULL; a->id = NULL; } a->tout.cb = respawn; for (i = MAX_ARGS - 1; i >= 1; i--) a->argv[i] = a->argv[i - 1]; a->argv[0] = ask; a->respawn = 500; a->proc.cb = child_exit; fork_worker(a); }
static void cmdline(void) { char line[20]; char* res; long r; res = get_cmdline_val("init_debug", line, sizeof(line)); if (res != NULL) { r = strtol(line, NULL, 10); if ((r != LONG_MIN) && (r != LONG_MAX)) debug = (int) r; } }
static void set_console(void) { const char* tty; char* split; char line[ 20 ]; const char* try[] = { "tty0", "console", NULL }; /* Try the most common outputs */ int f, i = 0; tty = get_cmdline_val("console",line,sizeof(line)); if (tty != NULL) { split = strchr(tty, ','); if ( split != NULL ) *split = '\0'; } else { // Try a default tty=try[i]; i++; } if (chdir("/dev")) { ERROR("failed to change dir to /dev\n"); return; } while (tty!=NULL) { f = open(tty, O_RDONLY); if (f >= 0) { close(f); break; } tty=try[i]; i++; } if (chdir("/")) ERROR("failed to change dir to /\n"); if (tty != NULL) set_stdio(tty); } static void state_enter(void) { char ubus_cmd[] = "/sbin/ubusd"; switch (state) { case STATE_EARLY: LOG("- early -\n"); watchdog_init(0); hotplug("/etc/hotplug.json"); procd_coldplug(); break; case STATE_UBUS: // try to reopen incase the wdt was not available before coldplug watchdog_init(0); set_stdio("console"); LOG("- ubus -\n"); procd_connect_ubus(); service_start_early("ubus", ubus_cmd); break; case STATE_INIT: LOG("- init -\n"); procd_inittab(); procd_inittab_run("respawn"); procd_inittab_run("askconsole"); procd_inittab_run("askfirst"); procd_inittab_run("sysinit"); // switch to syslog log channel ulog_open(ULOG_SYSLOG, LOG_DAEMON, "procd"); break; case STATE_RUNNING: LOG("- init complete -\n"); break; case STATE_SHUTDOWN: /* Redirect output to the console for the users' benefit */ set_console(); LOG("- shutdown -\n"); procd_inittab_run("shutdown"); sync(); break; case STATE_HALT: // To prevent killed processes from interrupting the sleep signal(SIGCHLD, SIG_IGN); LOG("- SIGTERM processes -\n"); kill(-1, SIGTERM); sync(); sleep(1); LOG("- SIGKILL processes -\n"); kill(-1, SIGKILL); sync(); sleep(1); #ifndef DISABLE_INIT if (reboot_event == RB_POWER_OFF) LOG("- power down -\n"); else LOG("- reboot -\n"); /* Allow time for last message to reach serial console, etc */ sleep(1); /* We have to fork here, since the kernel calls do_exit(EXIT_SUCCESS) * in linux/kernel/sys.c, which can cause the machine to panic when * the init process exits... */ if (!vfork( )) { /* child */ reboot(reboot_event); _exit(EXIT_SUCCESS); } while (1) sleep(1); #else exit(0); #endif break; default: ERROR("Unhandled state %d\n", state); return; }; } void procd_state_next(void) { DEBUG(4, "Change state %d -> %d\n", state, state + 1); state++; state_enter(); } void procd_state_ubus_connect(void) { if (state == STATE_UBUS) procd_state_next(); } void procd_shutdown(int event) { if (state >= STATE_SHUTDOWN) return; DEBUG(2, "Shutting down system with event %x\n", event); reboot_event = event; state = STATE_SHUTDOWN; state_enter(); }