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Date:	Fri, 17 Oct 2003 16:57:50 -0500 (CDT)
From:	Brian Ford <ford AT vss DOT fsi DOT com>
X-X-Sender:	ford AT eos
To:	Andy Howell <AndyHowell AT austin DOT rr DOT com>
cc:	cygwin AT cygwin DOT com
Subject:	Re: error setting pipe to non-blocking IO
In-Reply-To:	<3F906430.5000100@austin.rr.com>
Message-ID:	<Pine.GSO.4.56.0310171656160.823@eos>
References:	<3F906430 DOT 5000100 AT austin DOT rr DOT com>
MIME-Version:	1.0

On Fri, 17 Oct 2003, Andy Howell wrote:

> I am trying to setup a pipe to do non-blocking IO:
>
> int main()
> {
> 	int pipefd[2];
> 	int n;
> 	n = 1;
>
> 	pipe(pipefd);
> 	perror("Pipe: ");
> 	ioctl(pipefd[0], FIOBIO, &n);
> 	perror("Ioctl: ");
> }
>
> When I run this, I get:
>
> Pipe: No Error
> Ioctl: Invalid argument
>
> Any ideas?
>
Yup, unsupported.

from src/winsup/cygwin/fhandler.cc:909

int
fhandler_base::ioctl (unsigned int cmd, void *buf)
{
  if (cmd == FIONBIO)
    syscall_printf ("ioctl (FIONBIO, %p)", buf);
  else
    syscall_printf ("ioctl (%x, %p)", cmd, buf);

  set_errno (EINVAL);
  return -1;
}

-- 
Brian Ford
Senior Realtime Software Engineer
VITAL - Visual Simulation Systems
FlightSafety International
Phone: 314-551-8460
Fax:   314-551-8444

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