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

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Message-ID: <493EBD23.3020800@redhat.com>
Date:	Tue, 09 Dec 2008 13:46:59 -0500
From:	Casey Dahlin <cdahlin@...hat.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
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

Alan Cox wrote:
>> 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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Last I checked inotify was not supported in /proc, or at least most of 
it. What kind of work load is it to change that?

--CJD
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