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

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Message-Id: <1173364264.6891.3.camel@localhost>
Date:	Thu, 08 Mar 2007 08:31:04 -0600
From:	"David M. Lloyd" <dmlloyd@...rg.com>
To:	Davide Libenzi <davidel@...ilserver.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [patch 2/5] signalfd v2 - signalfd core ...

On Wed, 2007-03-07 at 17:21 -0800, Davide Libenzi wrote:
> int signalfd_dequeue(int fd, siginfo_t *info, long timeo);
> 
> The "fd" parameter must ba a signalfd file descriptor. The "info" parameter
> is a pointer to the siginfo that will receive the dequeued signal, and
> "timeo" is a timeout in milliseconds, or -1 for infinite.
> The signalfd_dequeue function returns 0 if successfull.

Does this support non-blocking mode?  It doesn't seem to at my level of
understanding anyway.  If I use this with EPOLLET for example, I'd
expect to get a single EPOLLIN when a signal arrives, which would
indicate to me that I must call signalfd_dequeue() in a loop until I get
EAGAIN in order to be sure I've consumed all the outstanding signals so
that the edge-triggered notification can be "re-armed".

Make sense?

- DML

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