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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
<<fclose>>---close a file
INDEX
fclose
INDEX
_fclose_r
ANSI_SYNOPSIS
#include <stdio.h>
int fclose(FILE *<[fp]>);
int _fclose_r(struct _reent *<[reent]>, FILE *<[fp]>);
TRAD_SYNOPSIS
#include <stdio.h>
int fclose(<[fp]>)
FILE *<[fp]>;
int fclose(<[fp]>)
struct _reent *<[reent]>
FILE *<[fp]>;
DESCRIPTION
If the file or stream identified by <[fp]> is open, <<fclose>> closes
it, after first ensuring that any pending data is written (by calling
<<fflush(<[fp]>)>>).
The alternate function <<_fclose_r>> is a reentrant version.
The extra argument <[reent]> is a pointer to a reentrancy structure.
RETURNS
<<fclose>> returns <<0>> if successful (including when <[fp]> is
<<NULL>> or not an open file); otherwise, it returns <<EOF>>.
PORTABILITY
<<fclose>> is required by ANSI C.
Required OS subroutines: <<close>>, <<fstat>>, <<isatty>>, <<lseek>>,
<<read>>, <<sbrk>>, <<write>>.
*/
#include <_ansi.h>
#include <reent.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/lock.h>
#include "local.h"
int
_DEFUN(_fclose_r, (rptr, fp),
struct _reent *rptr _AND
register FILE * fp)
{
int r;
if (fp == NULL)
return (0); /* on NULL */
__sfp_lock_acquire ();
CHECK_INIT (rptr);
_flockfile (fp);
if (fp->_flags == 0) /* not open! */
{
_funlockfile (fp);
__sfp_lock_release ();
return (0);
}
r = fp->_flags & __SWR ? fflush (fp) : 0;
if (fp->_close != NULL && (*fp->_close) (fp->_cookie) < 0)
r = EOF;
if (fp->_flags & __SMBF)
_free_r (rptr, (char *) fp->_bf._base);
if (HASUB (fp))
FREEUB (fp);
if (HASLB (fp))
FREELB (fp);
fp->_flags = 0; /* release this FILE for reuse */
_funlockfile (fp);
#ifndef __SINGLE_THREAD__
__lock_close_recursive (fp->_lock);
#endif
__sfp_lock_release ();
return (r);
}
#ifndef _REENT_ONLY
int
_DEFUN(fclose, (fp),
register FILE * fp)
{
return _fclose_r(_REENT, fp);
}
#endif
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