From c188fcedff735a6e31be7882a7b38dc3483802d9 Mon Sep 17 00:00:00 2001
From: Richard Yao <ryao@gentoo.org>
Date: Sun, 9 Jun 2013 05:40:07 -0400
Subject: [PATCH] Add call_func_timeout helper function

call_func_timeout permits us to call a helper function and kill it
should it exceed some timeout. This is derived from example code posted
on Stack Overflow:

http://stackoverflow.com/a/11056286

Signed-off-by: Richard Yao <ryao@gentoo.org>

Conflicts:
	defaults/initrd.scripts
---
 defaults/initrd.scripts | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/defaults/initrd.scripts b/defaults/initrd.scripts
index 8181681..b353817 100644
--- a/defaults/initrd.scripts
+++ b/defaults/initrd.scripts
@@ -109,6 +109,22 @@ plymouth_newroot() {
 	is_plymouth_started && "${PLYMOUTH_BIN}" --newroot="${1}"
 }
 
+call_func_timeout()
+{
+	local func=$1 timeout=$2 pid watcher
+	[ $# -ne 2 ] && gen_die "call_func_timeout() called with $# arguments"
+
+	( ${func} ) & pid=$!
+	( sleep ${timeout} && kill -HUP ${pid} ) 2>/dev/null & watcher=$!
+	if wait ${pid} 2>/dev/null; then
+	    kill -HUP $watcher 2> /dev/null
+	    wait $watcher 2>/dev/null
+	    return 1
+	fi
+
+	return 0
+}
+
 modules_load() {
 	for module in $*
 	do