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)
34 static 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
48 int
fclose(FILE * fp)49 fclose(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