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) 1988 AT&T */
28 /* All Rights Reserved */
29
30 #pragma ident "%Z%%M% %I% %E% SMI"
31
32 #include <sys/feature_tests.h>
33
34 #if !defined(_LP64) && _FILE_OFFSET_BITS == 64
35 #define __lockf __lockf64
36 #endif
37
38 #include "lint.h"
39 #include <sys/types.h>
40 #include <unistd.h>
41 #include <errno.h>
42 #include <fcntl.h>
43
44 int
__lockf(int fildes,int function,off_t size)45 __lockf(int fildes, int function, off_t size)
46 {
47 struct flock l;
48 int rv;
49
50 l.l_whence = 1;
51 if (size < 0) {
52 l.l_start = size;
53 l.l_len = -size;
54 } else {
55 l.l_start = (off_t)0;
56 l.l_len = size;
57 }
58 switch (function) {
59 case F_ULOCK:
60 l.l_type = F_UNLCK;
61 rv = fcntl(fildes, F_SETLK, &l);
62 break;
63 case F_LOCK:
64 l.l_type = F_WRLCK;
65 rv = fcntl(fildes, F_SETLKW, &l);
66 break;
67 case F_TLOCK:
68 l.l_type = F_WRLCK;
69 rv = fcntl(fildes, F_SETLK, &l);
70 break;
71 case F_TEST:
72 l.l_type = F_WRLCK;
73 rv = fcntl(fildes, F_GETLK, &l);
74 if (rv != -1) {
75 if (l.l_type == F_UNLCK)
76 return (0);
77 else {
78 errno = EAGAIN;
79 return (-1);
80 }
81 }
82 break;
83 default:
84 errno = EINVAL;
85 return (-1);
86 }
87 if (rv < 0) {
88 switch (errno) {
89 case EMFILE:
90 case ENOSPC:
91 case ENOLCK:
92 /*
93 * A deadlock error is given if we run out of resources,
94 * in compliance with /usr/group standards.
95 */
96 errno = EDEADLK;
97 break;
98 default:
99 break;
100 }
101 }
102 return (rv);
103 }
104