netdev - [PATCH] iputils signal mask issue

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Date:	Fri, 5 Nov 2010 17:56:24 -0200
From:	"Lucas C. Villa Real" <lucasvr@...olinux.org>
To:	netdev@...r.kernel.org
Subject: [PATCH] iputils signal mask issue

Hi,

Today we found an issue where arping would get stuck in an endless
loop. The problem was found to be related to the parent process (a
shell script) having had SIGALRM blocked, which is used by arping to
update "count" and to check the "timeout" global.

Since we cannot make assumptions on the signal masks of the
environment it's better to explicitly unblock the signals that the
utility needs before the main loop executes. It's worth noting that
although sigaction() is called to associate a handler to a given
signal, that function doesn't automatically unblock that signal.

A similar problem was noticed on rdisc, so the attached patch also
ensures to unblock the signals that it relies on.

Thanks,
Lucas

Download attachment "02-iputils-SIG_UNBLOCK.patch" of type "application/octet-stream" (1499 bytes)