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 24 #include <errno.h> 25 #include <limits.h> 26 #include <pthread.h> 27 #include <stdlib.h> 28 #include <string.h> 29 #include <sys/param.h> 30 #include <sys/sysctl.h> 31 #include <sys/types.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 int error, name[4]; 46 size_t len; 47 48 name[0] = CTL_KERN; 49 name[1] = KERN_PROC; 50 name[2] = KERN_PROC_PATHNAME; 51 name[3] = -1; 52 len = PATH_MAX; 53 error = sysctl(name, nitems(name), execname, &len, NULL, 0); 54 if (error != 0) { 55 rc = -1; 56 } else { 57 rc = len; 58 } 59 if (rc == -1) { 60 execname[0] = '\0'; 61 } else { 62 execname[rc] = '\0'; 63 ptr = execname; 64 } 65 } else { 66 ptr = execname; 67 } 68 69 (void) pthread_mutex_unlock(&mtx); 70 return (ptr); 71 } 72