linux-kernel - Re: [PATCH 2/3] signalfd: add ability to return siginfo in a raw format (v2)

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Message-ID: <CAKgNAkgHVB3=k_XOevobcMWuEqy2r75tdTc85ZYiD8rkn5OZKA@mail.gmail.com>
Date:	Sat, 19 Jan 2013 00:27:38 +0100
From:	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Andrey Vagin <avagin@...nvz.org>, linux-kernel@...r.kernel.org,
	criu@...nvz.org, linux-fsdevel@...r.kernel.org,
	linux-api@...r.kernel.org,
	Alexander Viro <viro@...iv.linux.org.uk>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	David Howells <dhowells@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Oleg Nesterov <oleg@...hat.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>
Subject: Re: [PATCH 2/3] signalfd: add ability to return siginfo in a raw
 format (v2)

> As SFD_RAW is being added to the kernel API we should document it.
> Please keep Michael cc'ed and work with him on getting the manpages
> updated.

The API is certainly no thing of beauty, as I already remarked here:
http://thread.gmane.org/gmane.linux.file-systems/70420/focus=1420228

A description of the API can be found here:
https://lwn.net/Articles/531939/

The main problem is the ugliness of changing the meaning of pread()'s
'offset' argument to be a multiplexed [signal queue selector + queue
position].

I do wonder if we can do better, though I have no particular solution
to offer beyond the sledgehammer of adding a new system call.

Cheers,

Michael


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Author of "The Linux Programming Interface"; http://man7.org/tlpi/
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