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      1 /* $NetBSD: h_spawn.c,v 1.3 2021/11/07 15:46:20 christos Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2012 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Charles Zhang <charles (at) NetBSD.org> and
      9  * Martin Husemann <martin (at) NetBSD.org>.
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     30  * POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 #include <sys/cdefs.h>
     33 __RCSID("$NetBSD: h_spawn.c,v 1.3 2021/11/07 15:46:20 christos Exp $");
     34 
     35 #include <stdio.h>
     36 #include <stdlib.h>
     37 #include <string.h>
     38 #include <unistd.h>
     39 
     40 int
     41 main(int argc, char **argv)
     42 {
     43 	unsigned long ret;
     44 	char *endp;
     45 
     46 	if (argc == 2 && strcmp(argv[1], "--resetids") == 0) {
     47 		if (getuid() != geteuid() || getgid() != getegid()) {
     48 			fprintf(stderr, "uid/gid do not match effective ids, "
     49 			    "uid: %d euid: %d gid: %d egid: %d\n",
     50 			    getuid(), geteuid(), getgid(), getegid());
     51 			exit(255);
     52 		}
     53 		return 0;
     54 	} else if (argc != 2) {
     55 		fprintf(stderr, "usage:\n\t%s (retcode)\n", getprogname());
     56 		exit(255);
     57 	}
     58 	ret = strtoul(argv[1], &endp, 10);
     59 	if (*endp != 0) {
     60 		fprintf(stderr,
     61 		    "invalid arg: %s\n"
     62 		    "usage:\n\t%s (retcode)\n", endp, getprogname());
     63 		exit(255);
     64 	}
     65 
     66 	fprintf(stderr, "%s exiting with status %lu\n", getprogname(), ret);
     67 	return ret;
     68 }
     69