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
34const char *
35getexecname(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