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Re: [PATCH 2/3] xfsqa: Fix signal usage in aio-dio test code

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: [PATCH 2/3] xfsqa: Fix signal usage in aio-dio test code
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Tue, 19 Jan 2010 04:18:06 -0500
Cc: xfs@xxxxxxxxxxx
In-reply-to: <1263891792-30952-3-git-send-email-david@xxxxxxxxxxxxx>
References: <1263891792-30952-1-git-send-email-david@xxxxxxxxxxxxx> <1263891792-30952-3-git-send-email-david@xxxxxxxxxxxxx>
User-agent: Mutt/1.5.19 (2009-01-05)
On Tue, Jan 19, 2010 at 08:03:11PM +1100, Dave Chinner wrote:
> Using signal() to set up signal handlers doesn't always do what you
> want. A recent upgrade made test 208 fail because wait() was not
> getting interrupted by a SIGALRM. Tracing showed that signal() was
> being converted to a sigaction(SA_RESTART) handler, which allows
> syscalls that return ERESTARTSYS to immediately restart without
> returning EINTR to the calling process. The kernel code returns
> ERESTARTSYS to signal interruptions while in wait().
> 
> Replace the use of signal with sigaction() to ensure that the
> SA_RESTART flag is not set and the EINTR is delivered to the process
> sitting in wait().  This makes test 208 terminate at 200s again.

Yeah, signal is deprecated in favour of sigaction for a reason..


Reviewed-by: Christoph Hellwig <hch@xxxxxx>

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