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, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 /*
23  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 
28 #include <limits.h>
29 #include <pthread.h>
30 #include <stdlib.h>
31 #include <string.h>
32 #include <unistd.h>
33 
34 const char *
35 getexecname(void)
36 {
37 	static char execname[PATH_MAX + 1] = "";
38 	static pthread_mutex_t mtx = PTHREAD_MUTEX_INITIALIZER;
39 	char *ptr = NULL;
40 	ssize_t rc;
41 
42 	(void) pthread_mutex_lock(&mtx);
43 
44 	if (strlen(execname) == 0) {
45 		rc = readlink("/proc/self/exe",
46 		    execname, sizeof (execname) - 1);
47 		if (rc == -1) {
48 			execname[0] = '\0';
49 		} else {
50 			execname[rc] = '\0';
51 			ptr = execname;
52 		}
53 	} else {
54 		ptr = execname;
55 	}
56 
57 	(void) pthread_mutex_unlock(&mtx);
58 	return (ptr);
59 }
60