1 /*-
2 * Copyright (c) 1990, 1993 The Regents of the University of California.
3 * Copyright (c) 2013 Mariusz Zaborski <oshogbo@FreeBSD.org>
4 * All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * Chris Torek.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 #if defined(LIBC_SCCS) && !defined(lint)
35 static char sccsid[] = "@(#)fclose.c 8.1 (Berkeley) 6/4/93";
36 #endif /* LIBC_SCCS and not lint */
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
39
40 #include "namespace.h"
41 #include <errno.h>
42 #include <stdbool.h>
43 #include <stdio.h>
44 #include <stdlib.h>
45 #include "un-namespace.h"
46 #include <spinlock.h>
47 #include "libc_private.h"
48 #include "local.h"
49
50 static int
cleanfile(FILE * fp,bool c)51 cleanfile(FILE *fp, bool c)
52 {
53 int r;
54
55 r = fp->_flags & __SWR ? __sflush(fp) : 0;
56 if (c) {
57 if (fp->_close != NULL && (*fp->_close)(fp->_cookie) < 0)
58 r = EOF;
59 }
60
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
84 return (r);
85 }
86
87 int
fdclose(FILE * fp,int * fdp)88 fdclose(FILE *fp, int *fdp)
89 {
90 int r, err;
91
92 if (fdp != NULL)
93 *fdp = -1;
94
95 if (fp->_flags == 0) { /* not open! */
96 errno = EBADF;
97 return (EOF);
98 }
99
100 FLOCKFILE_CANCELSAFE(fp);
101 r = 0;
102 if (fp->_close != __sclose) {
103 r = EOF;
104 errno = EOPNOTSUPP;
105 } else if (fp->_file < 0) {
106 r = EOF;
107 errno = EBADF;
108 }
109 if (r == EOF) {
110 err = errno;
111 (void)cleanfile(fp, true);
112 errno = err;
113 } else {
114 if (fdp != NULL)
115 *fdp = fp->_file;
116 r = cleanfile(fp, false);
117 }
118 FUNLOCKFILE_CANCELSAFE();
119
120 return (r);
121 }
122
123 int
fclose(FILE * fp)124 fclose(FILE *fp)
125 {
126 int r;
127
128 if (fp->_flags == 0) { /* not open! */
129 errno = EBADF;
130 return (EOF);
131 }
132
133 FLOCKFILE_CANCELSAFE(fp);
134 r = cleanfile(fp, true);
135 FUNLOCKFILE_CANCELSAFE();
136
137 return (r);
138 }
139