From: Michel Stam <m.stam@fugro.nl>
Date: Thu, 2 Oct 2014 11:56:21 +0000 (+0000)
Subject: Reboot busybox style via procd
X-Git-Url: http://git.archive.openwrt.org/?p=project%2Fprocd.git;a=commitdiff_plain;h=2c8176385a4f62b536303912ba508b9dc7931fad

Reboot busybox style via procd

It has been observed that, very rarely, the system does not reboot
when procd enters the shutdown state. Busybox seems to have an
obscure fix in its shutdown, where the parent (procd) process
is put in an infinite loop, and a special child is executed to
execute reboot(). This may very well be the cause.

Signed-off-by: Michel Stam <m.stam@fugro.nl>
---

diff --git a/state.c b/state.c
index b941634..c3d2303 100644
--- a/state.c
+++ b/state.c
@@ -86,7 +86,20 @@ static void state_enter(void)
 		sync();
 		sleep(1);
 		LOG("- reboot -\n");
-		reboot(reboot_event);
+
+		/* Allow time for last message to reach serial console, etc */
+		sleep(1);
+
+		/* We have to fork here, since the kernel calls do_exit(EXIT_SUCCESS)
+		 * in linux/kernel/sys.c, which can cause the machine to panic when
+		 * the init process exits... */
+		if (!vfork( )) { /* child */
+			reboot(reboot_event);
+			_exit(EXIT_SUCCESS);
+		}
+
+		while (1)
+			sleep(1);
 		break;
 
 	default: