Attempt RB_POWER_OFF before reboot.

Try a clean power off before using reboot.

Also this commit adds a debugging message before each call to
reboot().  I wasn't sure if reboot(RB_POWER_OFF) happens
synchronously, apparently it does, at least on x86-64.

diff --git a/src/init.c b/src/init.c
index ef7011c..7836158 100644 (file)
--- a/src/init.c
+++ b/src/init.c
@@ -1,5 +1,5 @@
 /* init
- * Copyright (C) 2013 Red Hat Inc.
+ * Copyright (C) 2013-2023 Red Hat Inc.
  *
  * 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
@@ -34,12 +34,21 @@ main (int argc, char *argv[])
   fprintf (stderr, "\n");
   fprintf (stderr, "\n");
 
-#if defined(HAVE_SYS_REBOOT_H) && defined(RB_AUTOBOOT)
-  /* Try to reboot the system. */
+#if defined(HAVE_SYS_REBOOT_H)
+#if defined(RB_POWER_OFF)
+  /* Try to power off the system. */
+  fprintf (stderr, "init: calling reboot RB_POWER_OFF\n");
+  reboot (RB_POWER_OFF);
+  perror ("reboot: RB_POWER_OFF");
+#endif
+#if defined(RB_AUTOBOOT)
+  /* Try to reboot the system (qemu -no-reboot turns this into exit). */
+  fprintf (stderr, "init: calling reboot RB_AUTOBOOT\n");
   reboot (RB_AUTOBOOT);
-  perror ("reboot");
-  /* Reboot attempt failed, fallthrough below. */
+  perror ("reboot: RB_AUTOBOOT");
+#endif
 #endif
+  /* Power off or reboot attempt failed, fallthrough below. */
 
   fprintf (stderr, "expect to see a kernel panic below, that is normal\n");
   fprintf (stderr, "\n");