RE: poll() emulation in git

From: Joachim Schmitz <jojo@schmitz-digital.de>
Date: Sep 5, 2012, 12:57 UTC
Message-ID: <00cf01cd8b66$034793c0$09d6bb40$@schmitz-digital.de>
In-Reply-To: <50474001.5030407@gnu.org>

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> From: Paolo Bonzini [mailto:paolo.bonzini@gmail.com] On Behalf Of Paolo Bonzini
> Sent: Wednesday, September 05, 2012 2:05 PM
> To: Joachim Schmitz
> Cc: 'Junio C Hamano'; git@vger.kernel.org; 'Erik Faye-Lund'; bug-gnulib@gnu.org
> Subject: Re: poll() emulation in git
> 
> Il 05/09/2012 13:24, Joachim Schmitz ha scritto:
> > However: this poll implementation, while compiling OK, doesn't work properly.
> > Because it uses recv(...,MSG_PEEK), it works on sockets only (returns ENOTSOCK on anything else), while the real poll() works on

all

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> > kind if file descriptors, at least that is my understanding.
> 
> Actually recv(...,MSG_PEEK) on most Unix variants works on non-sockets
> too.  The trick is taken from GNU Pth in turn.
> 
> > Here on HP NonStop, when being connected via an non-interactive SSH, we get a set of pipes (stdin, stdout, stderr) instead of a
> > socket to talk to, so the poll() just hangs/loops.
> 
> Does your system have a working FIONREAD ioctl for pipes?

It does have FIONREAD ioctl. Whether it works properly is to be determined... I'll test if you could show me how?

Bye, Jojo