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