- halt's -w depends on FEATURE_WTMP (Vladimir Dronnikov)

[oweals/busybox.git] / init / halt.c

diff --git a/init/halt.c b/init/halt.c
index d61c38760c0b970e7fb6d39e8e3deca9b295ca04..42b9edc08f849d364b8b68a12f109d7eb204dd07 100644 (file)
--- a/init/halt.c
+++ b/init/halt.c
@@ -1,31 +1,94 @@
 /* vi: set sw=4 ts=4: */
 /*
- * Mini halt implementation for busybox
+ * Poweroff reboot and halt, oh my.
  *
+ * Copyright 2006 by Rob Landley <rob@landley.net>
  *
- * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
+ * Licensed under GPL version 2, see file LICENSE in this tarball for details.
  */
 
-#include "internal.h"
-#include <signal.h>
+#include "libbb.h"
+#include <sys/reboot.h>
 
-extern int halt_main(int argc, char **argv)
+#if ENABLE_FEATURE_WTMP
+#include <sys/utsname.h>
+#include <utmp.h>
+#endif
+
+int halt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int halt_main(int argc UNUSED_PARAM, char **argv)
 {
-       /* don't assume init's pid == 1 */
-       exit(kill(findInitPid(), SIGUSR1));
+       static const int magic[] = {
+#ifdef RB_HALT_SYSTEM
+               RB_HALT_SYSTEM,
+#elif defined RB_HALT
+               RB_HALT,
+#endif
+#ifdef RB_POWER_OFF
+               RB_POWER_OFF,
+#elif defined RB_POWERDOWN
+               RB_POWERDOWN,
+#endif
+               RB_AUTOBOOT
+       };
+       static const smallint signals[] = { SIGUSR1, SIGUSR2, SIGTERM };
+
+       int delay = 0;
+       int which, flags, rc;
+#if ENABLE_FEATURE_WTMP
+       struct utmp utmp;
+       struct utsname uts;
+#endif
+
+       /* Figure out which applet we're running */
+       for (which = 0; "hpr"[which] != *applet_name; which++)
+               continue;
+
+       /* Parse and handle arguments */
+       opt_complementary = "d+"; /* -d N */
+       flags = getopt32(argv, "d:nf" USE_FEATURE_WTMP("w"), &delay);
+
+       sleep(delay);
+
+#if ENABLE_FEATURE_WTMP
+       if (access(bb_path_wtmp_file, R_OK|W_OK) == -1) {
+               close(creat(bb_path_wtmp_file, 0664));
+       }
+       memset(&utmp, 0, sizeof(utmp));
+       utmp.ut_tv.tv_sec = time(NULL);
+       safe_strncpy(utmp.ut_user, "shutdown", UT_NAMESIZE);
+       utmp.ut_type = RUN_LVL;
+       safe_strncpy(utmp.ut_id, "~~", sizeof(utmp.ut_id));
+       safe_strncpy(utmp.ut_line, "~~", UT_LINESIZE);
+       if (uname(&uts) == 0)
+               safe_strncpy(utmp.ut_host, uts.release, sizeof(utmp.ut_host));
+       updwtmp(bb_path_wtmp_file, &utmp);
+
+       if (flags & 8) /* -w */
+               return EXIT_SUCCESS;
+#endif /* !ENABLE_FEATURE_WTMP */
+
+       if (!(flags & 2)) /* no -n */
+               sync();
+
+       /* Perform action. */
+       rc = 1;
+       if (!(flags & 4)) { /* no -f */
+//TODO: I tend to think that signalling linuxrc is wrong
+// pity original author didn't comment on it...
+               if (ENABLE_FEATURE_INITRD) {
+                       pid_t *pidlist = find_pid_by_name("linuxrc");
+                       if (pidlist[0] > 0)
+                               rc = kill(pidlist[0], signals[which]);
+                       if (ENABLE_FEATURE_CLEAN_UP)
+                               free(pidlist);
+               }
+               if (rc)
+                       rc = kill(1, signals[which]);
+       } else
+               rc = reboot(magic[which]);
+
+       if (rc)
+               bb_error_msg("no");
+       return rc;
 }