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/* Copyright (C) 1991, 1993, 1994 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#include <ansidecl.h>
#include <errno.h>
#include <stdio.h>
/* Return the system file descriptor associated with STREAM. */
int
DEFUN(fileno, (stream), FILE *stream)
{
extern void __stdio_check_funcs __P ((FILE *));
if (! __validfp (stream))
{
errno = EINVAL;
return -1;
}
__stdio_check_funcs (stream);
if (stream->__io_funcs.__fileno == NULL)
{
#ifdef EOPNOTSUPP
errno = EOPNOTSUPP;
#else
errno = ENOSYS;
#endif
return -1;
}
return (*stream->__io_funcs.__fileno) (stream->__cookie);
}
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