[gdm] worker: kill process group when session exits

[Ray Strode <halfline src gnome org>]

commit 3d3b47b6d69fd1551c66468c379dc0e95c2e7dc4
Author: Ray Strode <rstrode redhat com>
Date:   Wed Jul 20 11:43:45 2016 -0400

    worker: kill process group when session exits
    
    Send a hangup signal to the session pg when it exits, so things
    have a chance to get cleaned up.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=776059

 daemon/gdm-session-worker.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/daemon/gdm-session-worker.c b/daemon/gdm-session-worker.c
index 7bbda49..421ef02 100644
--- a/daemon/gdm-session-worker.c
+++ b/daemon/gdm-session-worker.c
@@ -1666,6 +1666,8 @@ session_worker_child_watch (GPid              pid,
                                              worker->priv->service,
                                              status);
 
+        killpg (pid, SIGHUP);
+
         worker->priv->child_pid = -1;
         worker->priv->child_watch_id = 0;
         run_script (worker, GDMCONFDIR "/PostSession");