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Message-Id: <199911291714.LAA20853@hp2.xraylith.wisc.edu>
To: Corinna Vinschen <corinna AT vinschen DOT de>
cc: david Depere <ddepere AT cr2a-di DOT fr>,
        "'cygwin AT sourceware DOT cygnus DOT com'" <cygwin AT sourceware DOT cygnus DOT com>
Subject: Re: Problem URGENT with the argument F_SETOWN in the function fcntl 
In-reply-to: Your message of "Mon, 29 Nov 1999 15:58:48 +0100."
             <384294A8 DOT 45E14D42 AT vinschen DOT de> 
Date: Mon, 29 Nov 1999 11:14:11 -0600
From: Mumit Khan <khan AT NanoTech DOT Wisc DOT EDU>

Corinna Vinschen <corinna AT vinschen DOT de> writes:
> 
> F_SETOWN is in no way supported by Win32 so it's not possible to
> implement it. Nevertheless it's defined by POSIX, so it's part of
> the header. Maybe, it should be erased there...

As far as I know, F_SETOWN is a BSD thing, and not in the POSIX specs
(I have the older one, don't know if the newest one has it). POSIX
has asynchronous I/O (aio_*), so these BSD features are not really
needed. Of course, quite a few of the so called POSIX systems do not
yet support POSIX asynchronous I/O.

Here's some info from one of the Linux docs:

  Only the operations F_DUPFD,  F_GETFD,  F_SETFD,  F_GETFL,  F_SETFL,  
  F_GETLK, F_SETLK  and  F_SETLKW  are specified in POSIX.1; F_GETOWN
  and F_SETOWN are BSDisms not supported in SVr4.

For now, I agree with Corinna's workaround, but we need a better fix, 
and my opinion is to get rid of the macro to avoid configure scripts
from guessing incorrectly. Then we can code is with:
  
  #ifdef F_SETOWN
    fcntl (...);
  #endif

Regards,
Mumit


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