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 #if ENABLE_FEATURE_WTMP
  14 #include <sys/utsname.h>
  15 #include <utmp.h>
  16 #endif
  17
  18 int halt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  19 int halt_main(int argc UNUSED_PARAM, char **argv)
  20 {
  21         static const int magic[] = {
  22 #ifdef RB_HALT_SYSTEM
  23                 RB_HALT_SYSTEM,
  24 #elif defined RB_HALT
  25                 RB_HALT,
  26 #endif
  27 #ifdef RB_POWER_OFF
  28                 RB_POWER_OFF,
  29 #elif defined RB_POWERDOWN
  30                 RB_POWERDOWN,
  31 #endif
  32                 RB_AUTOBOOT
  33         };
  34         static const smallint signals[] = { SIGUSR1, SIGUSR2, SIGTERM };
  35
  36         int delay = 0;
  37         int which, flags, rc;
  38 #if ENABLE_FEATURE_WTMP
  39         struct utmp utmp;
  40         struct utsname uts;
  41 #endif
  42
  43         /* Figure out which applet we're running */
  44         for (which = 0; "hpr"[which] != *applet_name; which++)
  45                 continue;
  46
  47         /* Parse and handle arguments */
  48         opt_complementary = "d+"; /* -d N */
  49         flags = getopt32(argv, "d:nf" USE_FEATURE_WTMP("w"), &delay);
  50
  51         sleep(delay);
  52
  53 #if ENABLE_FEATURE_WTMP
  54         if (access(bb_path_wtmp_file, R_OK|W_OK) == -1) {
  55                 close(creat(bb_path_wtmp_file, 0664));
  56         }
  57         memset(&utmp, 0, sizeof(utmp));
  58         utmp.ut_tv.tv_sec = time(NULL);
  59         safe_strncpy(utmp.ut_user, "shutdown", UT_NAMESIZE);
  60         utmp.ut_type = RUN_LVL;
  61         safe_strncpy(utmp.ut_id, "~~", sizeof(utmp.ut_id));
  62         safe_strncpy(utmp.ut_line, "~~", UT_LINESIZE);
  63         if (uname(&uts) == 0)
  64                 safe_strncpy(utmp.ut_host, uts.release, sizeof(utmp.ut_host));
  65         updwtmp(bb_path_wtmp_file, &utmp);
  66
  67         if (flags & 8) /* -w */
  68                 return EXIT_SUCCESS;
  69 #endif /* !ENABLE_FEATURE_WTMP */
  70
  71         if (!(flags & 2)) /* no -n */
  72                 sync();
  73
  74         /* Perform action. */
  75         rc = 1;
  76         if (!(flags & 4)) { /* no -f */
  77 //TODO: I tend to think that signalling linuxrc is wrong
  78 // pity original author didn't comment on it...
  79                 if (ENABLE_FEATURE_INITRD) {
  80                         pid_t *pidlist = find_pid_by_name("linuxrc");
  81                         if (pidlist[0] > 0)
  82                                 rc = kill(pidlist[0], signals[which]);
  83                         if (ENABLE_FEATURE_CLEAN_UP)
  84                                 free(pidlist);
  85                 }
  86                 if (rc)
  87                         rc = kill(1, signals[which]);
  88         } else
  89                 rc = reboot(magic[which]);
  90
  91         if (rc)
  92                 bb_error_msg("no");
  93         return rc;
  94 }