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From: Neil Brown <neilb@cse.unsw.edu.au>
To: Alex Pennace <alex@pennace.org>
Date: Sat, 6 Oct 2001 09:22:00 +1000 (EST)
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Message-ID: <15294.16536.430907.650513@notabene.cse.unsw.edu.au>
Cc: Bernd Eckenfels <ecki@lina.inka.de>, linux-kernel@vger.kernel.org
Subject: Re: Desperately missing a working "pselect()" or similar...
In-Reply-To: message from Alex Pennace on Friday October 5
In-Reply-To: <3BBDD37D.56D7B359@isg.de>
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On Friday October 5, alex@pennace.org wrote:
> On Fri, Oct 05, 2001 at 10:36:53PM +0200, Bernd Eckenfels wrote:
> > In article <3BBDD37D.56D7B359@isg.de> you wrote:
> > > Without a proper pselect() implementation (the one in glibc is just
> > > a mock-up that doesn't prevent the race condition) I'm currently
> > > unable to come up with a good idea on how to wait on both types
> > > of events.
> > 
> > Isnt select() returning with EINTR?
> 
> The select system call doesn't return EINTR when the signal is caught
> prior to entry into select.

A technique I used in a similar situation once went something like:

tv.tv_sec=bignum;
tv.tv_usec = 0;
enable_signals();
select(nfds, &readfds,&writefds,0,&tv);

and have the signal handlers set tv.tv_sec to 0. (tv is a global
variable).

Then if the signal comes before the select, the select exits
immediately.

NeilBrown
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