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/*

 * Copyright (c) 1990 The Regents of the University of California.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms are permitted

 * provided that the above copyright notice and this paragraph are

 * duplicated in all such forms and that any documentation,

 * advertising materials, and other materials related to such

 * distribution and use acknowledge that the software was developed

 * by the University of California, Berkeley.  The name of the

 * University may not be used to endorse or promote products derived

 * from this software without specific prior written permission.

 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

 */

/*

FUNCTION

<<fileno>>---return file descriptor associated with stream

INDEX

        fileno

ANSI_SYNOPSIS

        #include <stdio.h>

        int fileno(FILE *<[fp]>);

TRAD_SYNOPSIS

        #include <stdio.h>

        int fileno(<[fp]>)

        FILE *<[fp]>;

DESCRIPTION

You can use <<fileno>> to return the file descriptor identified by <[fp]>.

RETURNS

<<fileno>> returns a non-negative integer when successful.

If <[fp]> is not an open stream, <<fileno>> returns -1.

PORTABILITY

<<fileno>> is not part of ANSI C.

POSIX requires <<fileno>>.

Supporting OS subroutines required: none.

*/

#include <_ansi.h>

#include <stdio.h>

#include "local.h"

int

_DEFUN(fileno, (f),

       FILE * f)

{

  int result;

  CHECK_INIT (_REENT, f);

  _flockfile (f);

  result = __sfileno (f);

  _funlockfile (f);

  return result;

}