Moved to csu/errno-loc.c.

[thirdparty/glibc.git] / streams / isastream.c

/* Copyright (C) 1998 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <errno.h>
#include <fcntl.h>
#include <stropts.h>

int
isastream (fildes)
     int fildes;
{
  /* In general we do not have a STREAMS implementation and therefore
     return 0.  But for invalid file descriptors we have to return an
     error.  */
  if (__fcntl (fildes, F_GETFD) < 0)
    return -1;

  /* No STREAM.  */
  return 0;
}