init/halt.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Poweroff reboot and halt, oh my.
   4  *
   5  * Copyright 2006 by Rob Landley <rob@landley.net>
   6  *
   7  * Licensed under GPL version 2, see file LICENSE in this tarball for details.
   8  */
   9
  10 #include "busybox.h"
  11 #include <sys/reboot.h>
  12
  13 int halt_main(int argc, char *argv[])
  14 {
  15         static const int magic[] = {
  16 #ifdef RB_HALT_SYSTEM
  17 RB_HALT_SYSTEM,
  18 #elif defined RB_HALT
  19 RB_HALT,
  20 #endif
  21 #ifdef RB_POWER_OFF
  22 RB_POWER_OFF,
  23 #elif defined RB_POWERDOWN
  24 RB_POWERDOWN,
  25 #endif
  26 RB_AUTOBOOT
  27         };
  28         static const int signals[] = { SIGUSR1, SIGUSR2, SIGTERM };
  29
  30         char *delay;
  31         int which, flags, rc = 1;
  32
  33         /* Figure out which applet we're running */
  34         for (which = 0; "hpr"[which] != *applet_name; which++);
  35
  36         /* Parse and handle arguments */
  37         flags = getopt32(argc, argv, "d:nf", &delay);
  38         if (flags & 1) sleep(xatou(delay));
  39         if (!(flags & 2)) sync();
  40
  41         /* Perform action. */
  42         if (ENABLE_INIT && !(flags & 4)) {
  43                 if (ENABLE_FEATURE_INITRD) {
  44                         pid_t *pidlist = find_pid_by_name("linuxrc");
  45                         if (pidlist[0] > 0)
  46                                 rc = kill(pidlist[0], signals[which]);
  47                         if (ENABLE_FEATURE_CLEAN_UP)
  48                                 free(pidlist);
  49                 }
  50                 if (rc)
  51                         rc = kill(1, signals[which]);
  52         } else
  53                 rc = reboot(magic[which]);
  54
  55         if (rc)
  56                 bb_error_msg("no");
  57         return rc;
  58 }