linux-kernel - Re: [RFC PATCH] waitfd: file descriptor to wait on child processes

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Message-Id: <1229157789.6128.0.camel@warcraft>
Date:	Sat, 13 Dec 2008 00:43:09 -0800
From:	Scott James Remnant <scott@...split.com>
To:	Davide Libenzi <davidel@...ilserver.org>
Cc:	Casey Dahlin <cdahlin@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] waitfd: file descriptor to wait on child processes

On Fri, 2008-12-12 at 20:29 -0800, Davide Libenzi wrote:

> And how about this?
> 
> 	sfd = signalfd(SIGCHLD);
> 
> 	for (;;) {
> 		poll(sfd, POLLIN);
> 		while ((pid = waitpid(0, &status, WNOHANG)) != -1)
> 			process_child_death(pid);
> 	}
> 
At this point, why have signalfd()'s read() return siginfo_t at all?

You have to discard the entire information since it's only ever the
first signal that matched, all subsequent ones are thrown away.

Scott
-- 
Have you ever, ever felt like this?
Had strange things happen?  Are you going round the twist?

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