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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, fp);

  _flockfile (fp);

  if (fp->_flags == 0)           /* not open! */

    {

      _funlockfile (fp);

      __sfp_lock_release ();

      return (0);

    }

  /* Unconditionally flush to allow special handling for seekable read

     files to reposition file to last byte processed as opposed to

     last byte read ahead into the buffer.  */

  r = _fflush_r (rptr, fp);

  if (fp->_close != NULL && fp->_close (rptr, fp->_cookie) < 0)

    r = EOF;

  if (fp->_flags & __SMBF)

    _free_r (rptr, (char *) fp->_bf._base);

  if (HASUB (fp))

    FREEUB (rptr, fp);

  if (HASLB (fp))

    FREELB (rptr, 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