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/*

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 <stdio.h>

#include "local.h"

int

_DEFUN (fileno, (f),

        FILE * f)

{

  CHECK_INIT (f);

  return __sfileno (f);

}