1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
28 /* All Rights Reserved */
29
30 #include "lint.h"
31 #include "mtlib.h"
32 #include "file64.h"
33 #include <stdio.h>
34 #include <thread.h>
35 #include <synch.h>
36 #include <stdlib.h>
37 #include <errno.h>
38 #include <stdio_ext.h>
39 #include "stdiom.h"
40
41 #define _iob __iob
42
43 /*
44 * _flockget and _flockrel are only called by the
45 * FLOCKFILE/FUNLOCKFILE macros in mtlib.h.
46 */
47
48 /*
49 * compute the lock's position, acquire it and return its pointer
50 */
51
52 rmutex_t *
_flockget(FILE * iop)53 _flockget(FILE *iop)
54 {
55 rmutex_t *rl = IOB_LCK(iop);
56
57 if (rl != NULL)
58 cancel_safe_mutex_lock(rl);
59 return (rl);
60 }
61
62 int
ftrylockfile(FILE * iop)63 ftrylockfile(FILE *iop)
64 {
65 rmutex_t *rl = IOB_LCK(iop);
66
67 if (rl != NULL)
68 return (mutex_trylock(rl));
69 return (0); /* can't happen? */
70 }
71
72 void
flockfile(FILE * iop)73 flockfile(FILE *iop)
74 {
75 rmutex_t *rl = IOB_LCK(iop);
76
77 if (rl != NULL)
78 (void) mutex_lock(rl);
79 }
80
81 void
funlockfile(FILE * iop)82 funlockfile(FILE *iop)
83 {
84 rmutex_t *rl = IOB_LCK(iop);
85
86 if (rl != NULL)
87 (void) mutex_unlock(rl);
88 }
89
90 int
__fsetlocking(FILE * iop,int type)91 __fsetlocking(FILE *iop, int type)
92 {
93 int ret = 0;
94
95 ret = GET_IONOLOCK(iop) ? FSETLOCKING_BYCALLER : FSETLOCKING_INTERNAL;
96
97 switch (type) {
98
99 case FSETLOCKING_QUERY:
100 break;
101
102 case FSETLOCKING_INTERNAL:
103 CLEAR_IONOLOCK(iop);
104 break;
105
106 case FSETLOCKING_BYCALLER:
107 SET_IONOLOCK(iop);
108 break;
109
110 default:
111 errno = EINVAL;
112 return (-1);
113 }
114
115 return (ret);
116 }
117