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      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 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     28 
     29 #include "lint.h"
     30 #include <sys/types.h>
     31 #include <sys/mman.h>
     32 #include <fcntl.h>
     33 #include <limits.h>
     34 #include <errno.h>
     35 #include "pos4obj.h"
     36 
     37 int
     38 shm_open(const char *path, int oflag, mode_t mode)
     39 {
     40 	int crflag;
     41 	int fd;
     42 	int flags;
     43 
     44 	if (__pos4obj_check(path) == -1)
     45 		return (-1);
     46 
     47 	/* acquire semaphore lock to have atomic operation */
     48 	if (__pos4obj_lock(path, SHM_LOCK_TYPE) < 0)
     49 		return (-1);
     50 
     51 	fd = __pos4obj_open(path, SHM_DATA_TYPE, oflag, mode, &crflag);
     52 
     53 	if (fd < 0) {
     54 		(void) __pos4obj_unlock(path, SHM_LOCK_TYPE);
     55 		return (-1);
     56 	}
     57 
     58 	if ((flags = fcntl(fd, F_GETFD)) < 0 ||
     59 	    fcntl(fd, F_SETFD, flags | FD_CLOEXEC) < 0) {
     60 		(void) __pos4obj_unlock(path, SHM_LOCK_TYPE);
     61 		(void) __close_nc(fd);
     62 		return (-1);
     63 	}
     64 
     65 	/* relase semaphore lock operation */
     66 	if (__pos4obj_unlock(path, SHM_LOCK_TYPE) < 0) {
     67 		(void) __close_nc(fd);
     68 		return (-1);
     69 	}
     70 
     71 	return (fd);
     72 }
     73 
     74 int
     75 shm_unlink(const char *path)
     76 {
     77 	int	oerrno;
     78 	int	err;
     79 
     80 	if (__pos4obj_check(path) < 0)
     81 		return (-1);
     82 
     83 	if (__pos4obj_lock(path, SHM_LOCK_TYPE) < 0)
     84 		return (-1);
     85 
     86 	err = __pos4obj_unlink(path, SHM_DATA_TYPE);
     87 
     88 	oerrno = errno;
     89 
     90 	(void) __pos4obj_unlock(path, SHM_LOCK_TYPE);
     91 
     92 	errno = oerrno;
     93 	return (err);
     94 
     95 }
     96