[PATCH 10/14][user-cr] Have app_restart() return pid

[Sukadev Bhattiprolu <sukadev-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>]

From: Sukadev Bhattiprolu <sukadev-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
Date: Fri, 5 Mar 2010 10:24:53 -0800
Subject: [PATCH 10/14][user-cr] Have app_restart() return pid

On success, return the pid of a the root of the restarted process tree.
This would enable callers to manage the restarted process-tree as a cgroup.

Signed-off-by: Sukadev Bhattiprolu <sukadev-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
---
 restart-main.c |    7 ++++++-
 restart.c      |    6 ++++++
 2 files changed, 12 insertions(+), 1 deletions(-)

diff --git a/restart-main.c b/restart-main.c
index d3a1782..237742e 100644
--- a/restart-main.c
+++ b/restart-main.c
@@ -332,6 +332,7 @@ static void parse_args(struct app_restart_args *args, int argc, char *argv[])
 
 int main(int argc, char *argv[])
 {
+	int ret;
 	struct app_restart_args args;
 
 	/*
@@ -345,6 +346,10 @@ int main(int argc, char *argv[])
 
 	parse_args(&args, argc, argv);
 
-	return app_restart(&args);
+	ret = app_restart(&args);
+	if (ret > 0)
+		ret = 0;
+
+	return ret;
 }
 
diff --git a/restart.c b/restart.c
index 0118ad9..b6ee23c 100644
--- a/restart.c
+++ b/restart.c
@@ -490,6 +490,12 @@ int app_restart(struct app_restart_args *args)
 		ret = ckpt_coordinator(&ctx);
 	}
 
+	/*
+	 * On success, return pid of root of the restart process tree.
+	 */
+	if (ret >= 0)
+		ret = global_child_pid;
+
 	return ret;
 }
 
-- 
1.6.0.4