147 lines
3.4 KiB
C
147 lines
3.4 KiB
C
/*
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* cinit
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* (c) 2005 Nico Schottelius (nico-linux at schottelius.org)
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* We are called by signal to reboot
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*/
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#include <sys/mount.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <sys/reboot.h>
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#include <unistd.h>
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#include <signal.h>
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#include <stdio.h>
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#include <time.h>
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#include <stdlib.h>
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#include "cinit.h"
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/***********************************************************************
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* sig_reboot
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* Shutdown the system
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*/
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void sig_reboot(int signal)
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{
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struct listitem *tmp;
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struct timespec ts;
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char **cmd;
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int i;
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/* Let's disappear, we don't care about clients anymore */
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close(sock);
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/********* first SIGTERM the respawning processes **********/
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tmp = list->before;
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do {
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/* kill service watcher, which will kill processes itself */
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if( tmp->status == ST_RESPAWN) {
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kill(tmp->pid,SIGTERM);
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}
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tmp = tmp->before;
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} while( tmp != list );
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/********* now wait for the respawn watchers to return *****/
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tmp = list->before;
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do {
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if( tmp->status == ST_RESPAWN) {
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/* wait until the respawn watcher terminated */
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waitpid(tmp->pid,&i,0);
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}
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/* execute shutdown service FIXME: parallelize that?*/
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exec_svc(tmp->abs_path,CMD_STOP_SVC);
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tmp = tmp->before;
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} while( tmp != list );
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/* now: all services are down, let's kill all other processes */
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if( kill(-1,SIGTERM) == -1) {
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perror(MSG_TERMKILL);
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}
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ts.tv_sec = SLEEP_KILL; /* defined in conf/sleep_kill */
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nanosleep(&ts,NULL);
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if( kill(-1,SIGKILL) == -1) {
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perror(MSG_KILLBILL);
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}
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D_PRINTF("SIGKILL GESENDET");
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/* release tmp */
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if(umount(CINIT_TMNT) == -1) {
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perror(CINIT_TMNT);
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}
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/* THIS IS FUCKING UNCLEAN AND SHOULD BE CLEANED UP VERY MUCH!!! */
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#define CMD_CNT 4
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#define UMOUNT_CMD "/bin/umount"
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#define UMOUNT_ARG1 "-arfd"
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#define MOUNT_CMD "/bin/mount"
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#define MOUNT_ARG1 "-o"
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#define MOUNT_ARG2 "remount,ro"
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#define MOUNT_ARG3 "/"
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#define RESCUE_CMD "/bin/sh"
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/* now: we are completley alone. umount everything, go to bed */
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cmd = (char **) malloc( (CMD_CNT+1) * ( sizeof (char*) ) );
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if(cmd) {
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/* /bin/umount -a */
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cmd[0] = UMOUNT_CMD;
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cmd[1] = UMOUNT_ARG1;
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cmd[2] = NULL;
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i = fork();
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if(i == 0) {
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execv(cmd[0],cmd);
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_exit(1); /* if exec fails in child */
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}
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/* /bin/mount -o remount,ro / */
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cmd[0] = MOUNT_CMD;
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cmd[1] = MOUNT_ARG1;
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cmd[2] = MOUNT_ARG2;
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cmd[3] = MOUNT_ARG3;
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cmd[4] = NULL;
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i = fork();
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if(i == 0) {
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execv(cmd[0],cmd);
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_exit(1); /* if exec fails in child */
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}
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} else {
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_exit(1);
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}
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switch(signal) {
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case SIGTERM: /* power off */
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LOG(MSG_POWER_OFF);
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reboot(RB_POWER_OFF);
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break;
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case SIGHUP: /* reboot */
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LOG(MSG_REBOOT);
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reboot(RB_AUTOBOOT);
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break;
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case SIGUSR1: /* halt */
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LOG(MSG_HALT);
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reboot(RB_HALT_SYSTEM);
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break;
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case SIGUSR2: /* rescue - destroy ourself */
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LOG(MSG_RESCUE);
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cmd[0] = RESCUE_CMD;
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cmd[1] = NULL;
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execv(cmd[0],cmd);
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panic();
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break;
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case SIGCONT: /* update */
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LOG(MSG_UPDATE);
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cmd[0] = CINIT_BIN;
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cmd[1] = NULL;
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execv(cmd[0],cmd);
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panic();
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break;
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}
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/* do not exit, Linux does that for us */
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}
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