linux-kernel - Re: [patch 2/5] signalfd v2

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Message-ID: <45F0A2F2.3080102@goop.org>
Date:	Thu, 08 Mar 2007 15:57:38 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Davide Libenzi <davidel@...ilserver.org>,
	"David M. Lloyd" <dmlloyd@...rg.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@....linux.org.uk>
Subject: Re: [patch 2/5] signalfd v2 - signalfd core ...

Linus Torvalds wrote:
> So I think you should get rid of signalfd_dequeue(), and just replace it 
> with a "read()" function.
>   

The difficulty is that there are 4 different formats of signal structure
you could get: (traditional|siginfo) x (32bit|64bit).

What happens if you're a 32 bit process, you fork and exec a 64bit
process who inherits the signalfd, and they start reading?  What format
of signal structure do they get?  What do you get?  What if you start
doing partial reads?

I think signalfd_dequeue() is warty, but read() has has a number of
details to sort out.

(Hey, can you send signals by writing into the signalfd?  Very plan9...)

    J
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