From: Trond Myklebust <trond.myklebust@fys.uio.no>
To: Alex Riesen <raa.lkml@gmail.com>
Cc: boi@boi.at, linux-kernel@vger.kernel.org
Subject: Re: blocking file lock functions (lockf,flock,fcntl) do not return after timer signal
Date: Wed, 12 Oct 2005 12:36:47 -0400 [thread overview]
Message-ID: <1129135007.8434.19.camel@lade.trondhjem.org> (raw)
In-Reply-To: <81b0412b0510120810o6d06a678q1d4a9787687b9bfa@mail.gmail.com>
on den 12.10.2005 Klokka 17:10 (+0200) skreiv Alex Riesen:
> > Desktop$ ./gnurr gnarg
> > locking...
> > timeout
> > timeout
> > timeout
> > timeout
> > timeout
>
> Doesn't look so. I'd expect "flock: EWOULDBLOCK" and "sleeping" after
> the first timeout.
I would rather expect flock to return with ERESTARTSYS and then for libc
to restart the syscall once the signal handler has finished executing.
A stint with the "strace" utility will show you that this is precisely
what happens.
As Dick and others already pointed out to you, the POSIX function
sigaction() allows you to disable the automatic restarting of the
syscall.
Cheers,
Trond
prev parent reply other threads:[~2005-10-12 16:37 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-12 7:54 "Dieter Müller (BOI GmbH)"
2005-10-12 12:48 ` Alex Riesen
2005-10-12 13:09 ` linux-os (Dick Johnson)
2005-10-12 14:39 ` Trond Myklebust
2005-10-12 15:10 ` Alex Riesen
2005-10-12 15:20 ` linux-os (Dick Johnson)
2005-10-12 15:37 ` Michael Kerrisk
2005-10-12 15:43 ` linux-os (Dick Johnson)
2005-10-12 16:05 ` Michael Kerrisk
2005-10-12 16:06 ` Mark Lord
2005-10-12 21:15 ` Alex Riesen
2005-10-12 16:36 ` Trond Myklebust [this message]
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