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. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#if defined(LIBC_SCCS) && !defined(lint)
34static char sccsid[] = "@(#)fclose.c	8.1 (Berkeley) 6/4/93";
35#endif /* LIBC_SCCS and not lint */
36#include <sys/cdefs.h>
37__FBSDID("$FreeBSD$");
38
39#include "namespace.h"
40#include <errno.h>
41#include <stdio.h>
42#include <stdlib.h>
43#include "un-namespace.h"
44#include <spinlock.h>
45#include "libc_private.h"
46#include "local.h"
47
48int
49fclose(FILE *fp)
50{
51	int r;
52
53	if (fp->_flags == 0) {	/* not open! */
54		errno = EBADF;
55		return (EOF);
56	}
57	FLOCKFILE(fp);
58	r = fp->_flags & __SWR ? __sflush(fp) : 0;
59	if (fp->_close != NULL && (*fp->_close)(fp->_cookie) < 0)
60		r = EOF;
61	if (fp->_flags & __SMBF)
62		free((char *)fp->_bf._base);
63	if (HASUB(fp))
64		FREEUB(fp);
65	if (HASLB(fp))
66		FREELB(fp);
67	fp->_file = -1;
68	fp->_r = fp->_w = 0;	/* Mess up if reaccessed. */
69
70	/*
71	 * Lock the spinlock used to protect __sglue list walk in
72	 * __sfp().  The __sfp() uses fp->_flags == 0 test as an
73	 * indication of the unused FILE.
74	 *
75	 * Taking the lock prevents possible compiler or processor
76	 * reordering of the writes performed before the final _flags
77	 * cleanup, making sure that we are done with the FILE before
78	 * it is considered available.
79	 */
80	STDIO_THREAD_LOCK();
81	fp->_flags = 0;		/* Release this FILE for reuse. */
82	STDIO_THREAD_UNLOCK();
83	FUNLOCKFILE(fp);
84	return (r);
85}
86