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

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Message-ID: <20081209170543.59b4fb73@lxorguk.ukuu.org.uk>
Date:	Tue, 9 Dec 2008 17:05:43 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Casey Dahlin <cdahlin@...hat.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Scott James Remnant <scott@...split.com>
Subject: Re: [RFC PATCH] waitfd: file descriptor to wait on child processes

> prototype for a fourth: waitfd. It pretty much does what the name 
> suggests: reading from it yields a series of status ints (as would be 
> written into the second argument of waitpid) for child processes that 
> have changed state. It takes essentially the same arguments as waitpid 
> (for now) and supports the same set of features.

This propogates the fundamental braindamage of waitpid - the fact the
notification only works on child process trees.

Here is a more elegant suggestion - use epoll, inotify and friends  fully
on /proc process nodes.

Alan


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