linux-kernel - Re: [RESEND][RFC PATCH v2] waitfd

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Message-ID: <517f3f820901081404x6177b413hfa21f1613ffb4213@mail.gmail.com>
Date:	Fri, 9 Jan 2009 11:04:48 +1300
From:	"Michael Kerrisk" <mtk.manpages@...il.com>
To:	"Roland McGrath" <roland@...hat.com>,
	"Casey Dahlin" <cdahlin@...hat.com>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Linux Kernel" <linux-kernel@...r.kernel.org>,
	"Randy Dunlap" <randy.dunlap@...cle.com>,
	"Oleg Nesterov" <oleg@...hat.com>,
	"Davide Libenzi" <davidel@...ilserver.org>,
	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>,
	"Andi Kleen" <andi@...stfloor.org>,
	"Ulrich Drepper" <drepper@...hat.com>
Subject: Re: [RESEND][RFC PATCH v2] waitfd

On Thu, Jan 8, 2009 at 9:53 AM, Roland McGrath <roland@...hat.com> wrote:
> New syscall should have gone to linux-api, I think.

Yes, precisely.  This requirement has been documented in
SubmittingPatches for several months now.  More details here:
http://thread.gmane.org/gmane.linux.ltp/5658

Casey, *please* don't submit a patch for a system call without also
providing a test program, and some attempt at userspace documentation.
 (Andi already pointed this out.  From my POV, I don't need you to
write a full blown man page -- if you send me the text, I'll do the
*roff stuff.  But that text should accompany the patch that implements
the syscall.)

Cheers,

Michael

>
> Do we really need another one for this?  How about using signalfd plus
> setting the child's exit_signal to a queuing (SIGRTMIN+n) signal instead of
> SIGCHLD?  It's slightly more magical for the userland process to know to do
> that (fork -> clone SIGRTMIN).  But compared to adding a syscall we don't
> really have to add, maybe better.
>
>
> Thanks,
> Roland
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-- 
Michael Kerrisk Linux man-pages maintainer;
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