lib/libc/stdio/fclose.c

   1 /*-
   2  * Copyright (c) 1990, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Chris Torek.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  * @(#)fclose.c 8.1 (Berkeley) 6/4/93
  37  * $FreeBSD: src/lib/libc/stdio/fclose.c,v 1.8 1999/11/21 22:34:57 dt Exp $
  38  * $DragonFly: src/lib/libc/stdio/fclose.c,v 1.9 2005/07/23 20:23:05 joerg Exp $
  39  */
  40
  41 #include "namespace.h"
  42 #include <errno.h>
  43 #include <stdio.h>
  44 #include <stdlib.h>
  45 #include "un-namespace.h"
  46
  47 #include "libc_private.h"
  48 #include "local.h"
  49 #include "priv_stdio.h"
  50
  51 int
  52 fclose(FILE *fp)
  53 {
  54         int r;
  55
  56         if (fp->pub._flags == 0) {      /* not open! */
  57                 errno = EBADF;
  58                 return (EOF);
  59         }
  60         FLOCKFILE(fp);
  61         r = fp->pub._flags & __SWR ? __sflush(fp) : 0;
  62         if (fp->_close != NULL && (*fp->_close)(fp->_cookie) < 0)
  63                 r = EOF;
  64         if (fp->pub._flags & __SMBF)
  65                 free((char *)fp->_bf._base);
  66         if (HASUB(fp))
  67                 FREEUB(fp);
  68         if (HASLB(fp))
  69                 FREELB(fp);
  70         /*
  71          * XXX-HITEN the FUNLOCKFILE(fp) cannot be moved below because of
  72          * the way the funlockfile() implementation works; it surrounds
  73          * the code with a if (fp->_file >= 0)... terrible, just terrible.
  74          *
  75          * This mess will be cleaned up when I rewrite the file contention
  76          * locking code.
  77          */
  78         FUNLOCKFILE(fp);
  79         fp->pub._fileno = -1;
  80         fp->pub._r = fp->pub._w = 0;    /* Mess up if reaccessed. */
  81 #if 0
  82         if (fp->_lock != NULL) {
  83                 _pthread_mutex_destroy((pthread_mutex_t *)&fp->_lock);
  84                 fp->_lock = NULL;
  85         }
  86 #endif
  87         fp->pub._flags = 0;             /* Release this FILE for reuse. */
  88         return (r);
  89 }