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 "libbb.h"
  11 #include <sys/reboot.h>
  12
  13 int halt_main(int argc, char **argv);
  14 int halt_main(int argc, char **argv)
  15 {
  16         static const int magic[] = {
  17 #ifdef RB_HALT_SYSTEM
  18 RB_HALT_SYSTEM,
  19 #elif defined RB_HALT
  20 RB_HALT,
  21 #endif
  22 #ifdef RB_POWER_OFF
  23 RB_POWER_OFF,
  24 #elif defined RB_POWERDOWN
  25 RB_POWERDOWN,
  26 #endif
  27 RB_AUTOBOOT
  28         };
  29         static const int signals[] = { SIGUSR1, SIGUSR2, SIGTERM };
  30
  31         char *delay;
  32         int which, flags, rc = 1;
  33
  34         /* Figure out which applet we're running */
  35         for (which = 0; "hpr"[which] != *applet_name; which++);
  36
  37         /* Parse and handle arguments */
  38         flags = getopt32(argc, argv, "d:nf", &delay);
  39         if (flags & 1) sleep(xatou(delay));
  40         if (!(flags & 2)) sync();
  41
  42         /* Perform action. */
  43         if (ENABLE_INIT && !(flags & 4)) {
  44                 if (ENABLE_FEATURE_INITRD) {
  45                         pid_t *pidlist = find_pid_by_name("linuxrc");
  46                         if (pidlist[0] > 0)
  47                                 rc = kill(pidlist[0], signals[which]);
  48                         if (ENABLE_FEATURE_CLEAN_UP)
  49                                 free(pidlist);
  50                 }
  51                 if (rc)
  52                         rc = kill(1, signals[which]);
  53         } else
  54                 rc = reboot(magic[which]);
  55
  56         if (rc)
  57                 bb_error_msg("no");
  58         return rc;
  59 }