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 #include "lint.h"
28 #include <sys/types.h>
29 #include <sys/mman.h>
30 #include <fcntl.h>
31 #include <limits.h>
32 #include <errno.h>
33 #include "pos4obj.h"
34
35 int
shm_open(const char * path,int oflag,mode_t mode)36 shm_open(const char *path, int oflag, mode_t mode)
37 {
38 int crflag;
39 int fd;
40 int flags;
41
42 if (__pos4obj_check(path) == -1)
43 return (-1);
44
45 /* acquire semaphore lock to have atomic operation */
46 if (__pos4obj_lock(path, SHM_LOCK_TYPE) < 0)
47 return (-1);
48
49 fd = __pos4obj_open(path, SHM_DATA_TYPE, oflag, mode, &crflag);
50
51 if (fd < 0) {
52 (void) __pos4obj_unlock(path, SHM_LOCK_TYPE);
53 return (-1);
54 }
55
56 if ((flags = fcntl(fd, F_GETFD)) < 0 ||
57 fcntl(fd, F_SETFD, flags | FD_CLOEXEC) < 0) {
58 (void) __pos4obj_unlock(path, SHM_LOCK_TYPE);
59 (void) __close_nc(fd);
60 return (-1);
61 }
62
63 /* relase semaphore lock operation */
64 if (__pos4obj_unlock(path, SHM_LOCK_TYPE) < 0) {
65 (void) __close_nc(fd);
66 return (-1);
67 }
68
69 return (fd);
70 }
71
72 int
shm_unlink(const char * path)73 shm_unlink(const char *path)
74 {
75 int oerrno;
76 int err;
77
78 if (__pos4obj_check(path) < 0)
79 return (-1);
80
81 if (__pos4obj_lock(path, SHM_LOCK_TYPE) < 0)
82 return (-1);
83
84 err = __pos4obj_unlink(path, SHM_DATA_TYPE);
85
86 oerrno = errno;
87
88 (void) __pos4obj_unlock(path, SHM_LOCK_TYPE);
89
90 errno = oerrno;
91 return (err);
92
93 }
94