49 lines
1.4 KiB
C
49 lines
1.4 KiB
C
/* Copyright (C) 1991, 1993, 1994 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <errno.h>
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#include <stdio.h>
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/* Return the system file descriptor associated with STREAM. */
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int
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DEFUN(fileno, (stream), FILE *stream)
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{
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extern void __stdio_check_funcs __P ((FILE *));
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if (! __validfp (stream))
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{
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errno = EINVAL;
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return -1;
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}
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__stdio_check_funcs (stream);
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if (stream->__io_funcs.__fileno == NULL)
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{
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#ifdef EOPNOTSUPP
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errno = EOPNOTSUPP;
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#else
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errno = ENOSYS;
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#endif
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return -1;
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}
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return (*stream->__io_funcs.__fileno) (stream->__cookie);
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}
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