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getexecpath.c revision 1.2 
      1 /*	$NetBSD: getexecpath.c,v 1.2 2026/10/07 20:15:03 christos Exp $	*/
      2 /*-
      3  * Copyright (c) 2026 The NetBSD Foundation, Inc.
      4  * All rights reserved.
      5  *
      6  * This code is derived from software contributed to The NetBSD Foundation
      7  * by Christos Zoulas.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     19  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     20  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     21  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     22  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     28  * POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include <dlfcn.h>
     32 #include <string.h>
     33 #include <errno.h>
     34 #include <elf.h>
     35 
     36 #include "getexecpath.h"
     37 
     38 int
     39 getexecpath(char *buf, size_t len)
     40 {
     41 	const AuxInfo *aux;
     42 
     43 	for (aux = _dlauxinfo(); aux->a_type != AT_NULL; ++aux)
     44 		if (aux->a_type == AT_SUN_EXECNAME) {
     45 			if (strlcpy(buf, (void *)(intptr_t)aux->a_v, len) < len)
     46 				return 0;
     47 			errno = ERANGE;
     48 			return -1;
     49 		}
     50 	errno = ENOENT;
     51 	return -1;
     52 }
     53 
     54 #ifdef TEST
     55 #include <stdio.h>
     56 #include <err.h>
     57 #include <stdlib.h>
     58 #include <limits.h>
     59 
     60 int
     61 main(void)
     62 {
     63 	char buf[PATH_MAX];
     64 	if (getexecpath(buf, sizeof(buf)) == -1)
     65 		err(EXIT_FAILURE, "Can't get path");
     66 	printf("%s\n", buf);
     67 	return 0;
     68 }
     69 #endif
     70