[gentoo-commits] proj/genkernel:ryao commit in: defaults/

["Richard Yao" <ryao@gentoo.org>]

commit:     a21728ae287e988a1848435ab27f7ab503def784
Author:     Richard Yao <ryao <AT> gentoo <DOT> org>
AuthorDate: Sun Jun  9 09:40:07 2013 +0000
Commit:     Richard Yao <ryao <AT> gentoo <DOT> org>
CommitDate: Sun Jun  9 13:47:39 2013 +0000
URL:        http://git.overlays.gentoo.org/gitweb/?p=proj/genkernel.git;a=commit;h=a21728ae

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 <AT> gentoo.org>

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

diff --git a/defaults/initrd.scripts b/defaults/initrd.scripts
index 9b0e899..bfdde75 100644
--- a/defaults/initrd.scripts
+++ b/defaults/initrd.scripts
@@ -2,6 +2,22 @@
 
 . /etc/initrd.defaults
 
+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