From c3926429efb09c2264f25b0fa60e1e9f0738f067 Mon Sep 17 00:00:00 2001
From: Ross Lagerwall <rosslagerwall@gmail.com>
Date: Sun, 9 Jun 2013 17:28:44 +0100
Subject: [PATCH] service: don't report alien child as alive when it's not

When a sigchld is received from an alien child, main_pid is set to
0 then service_enter_running calls main_pid_good to check if the
child is running.  This incorrectly returned true because
kill(main_pid, 0) would return >= 0.

This fixes an error where a service would die and the cgroup would
become empty but the service would still report as active (running).
---
 src/core/service.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/core/service.c b/src/core/service.c
index 0297eb5..2be8623 100644
--- a/src/core/service.c
+++ b/src/core/service.c
@@ -1878,7 +1878,7 @@ static int main_pid_good(Service *s) {
 
                 /* If it's an alien child let's check if it is still
                  * alive ... */
-                if (s->main_pid_alien)
+                if (s->main_pid_alien && s->main_pid > 0)
                         return kill(s->main_pid, 0) >= 0 || errno != ESRCH;
 
                 /* .. otherwise assume we'll get a SIGCHLD for it,