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 #pragma ident "%Z%%M% %I% %E% SMI"
31
32 #include "lint.h"
33 #include "mtlib.h"
34 #include "file64.h"
35 #include <stdio.h>
36 #include <thread.h>
37 #include <synch.h>
38 #include <stdlib.h>
39 #include <errno.h>
40 #include <stdio_ext.h>
41 #include "stdiom.h"
42
43 #define _iob __iob
44
45 /*
46 * _flockget and _flockrel are only called by the
47 * FLOCKFILE/FUNLOCKFILE macros in mtlib.h.
48 */
49
50 /*
51 * compute the lock's position, acquire it and return its pointer
52 */
53
54 rmutex_t *
_flockget(FILE * iop)55 _flockget(FILE *iop)
56 {
57 rmutex_t *rl = IOB_LCK(iop);
58
59 if (rl != NULL)
60 cancel_safe_mutex_lock(rl);
61 return (rl);
62 }
63
64 int
ftrylockfile(FILE * iop)65 ftrylockfile(FILE *iop)
66 {
67 rmutex_t *rl = IOB_LCK(iop);
68
69 if (rl != NULL)
70 return (mutex_trylock(rl));
71 return (0); /* can't happen? */
72 }
73
74 void
flockfile(FILE * iop)75 flockfile(FILE *iop)
76 {
77 rmutex_t *rl = IOB_LCK(iop);
78
79 if (rl != NULL)
80 (void) mutex_lock(rl);
81 }
82
83 void
funlockfile(FILE * iop)84 funlockfile(FILE *iop)
85 {
86 rmutex_t *rl = IOB_LCK(iop);
87
88 if (rl != NULL)
89 (void) mutex_unlock(rl);
90 }
91
92 int
__fsetlocking(FILE * iop,int type)93 __fsetlocking(FILE *iop, int type)
94 {
95 int ret = 0;
96
97 ret = GET_IONOLOCK(iop) ? FSETLOCKING_BYCALLER : FSETLOCKING_INTERNAL;
98
99 switch (type) {
100
101 case FSETLOCKING_QUERY:
102 break;
103
104 case FSETLOCKING_INTERNAL:
105 CLEAR_IONOLOCK(iop);
106 break;
107
108 case FSETLOCKING_BYCALLER:
109 SET_IONOLOCK(iop);
110 break;
111
112 default:
113 errno = EINVAL;
114 return (-1);
115 }
116
117 return (ret);
118 }
119