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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [stdio/] [fileno.c] - Blame information for rev 207

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1 207 jeremybenn
/*
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 * Copyright (c) 1990 The Regents of the University of California.
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms are permitted
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 * provided that the above copyright notice and this paragraph are
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 * duplicated in all such forms and that any documentation,
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 * advertising materials, and other materials related to such
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 * distribution and use acknowledge that the software was developed
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 * by the University of California, Berkeley.  The name of the
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 * University may not be used to endorse or promote products derived
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 * from this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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 */
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/*
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FUNCTION
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<<fileno>>---return file descriptor associated with stream
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INDEX
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        fileno
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ANSI_SYNOPSIS
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        #include <stdio.h>
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        int fileno(FILE *<[fp]>);
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TRAD_SYNOPSIS
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        #include <stdio.h>
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        int fileno(<[fp]>)
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        FILE *<[fp]>;
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DESCRIPTION
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You can use <<fileno>> to return the file descriptor identified by <[fp]>.
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RETURNS
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<<fileno>> returns a non-negative integer when successful.
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If <[fp]> is not an open stream, <<fileno>> returns -1.
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PORTABILITY
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<<fileno>> is not part of ANSI C.
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POSIX requires <<fileno>>.
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Supporting OS subroutines required: none.
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*/
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#include <_ansi.h>
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#include <stdio.h>
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#include "local.h"
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int
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_DEFUN(fileno, (f),
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       FILE * f)
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{
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  int result;
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  CHECK_INIT (_REENT, f);
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  _flockfile (f);
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  result = __sfileno (f);
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  _funlockfile (f);
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  return result;
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}

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