1/*- 2 * Copyright (c) 2017 The NetBSD Foundation, Inc. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to The NetBSD Foundation 6 * by Christos Zoulas. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 19 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 20 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 27 * POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30#include <stdio.h> 31#include <stdlib.h> 32#include <err.h> 33#include <sys/sysctl.h> 34 35static int 36getprocpath(char *path, size_t len, pid_t pid) 37{ 38 const int name[] = { 39 CTL_KERN, KERN_PROC_ARGS, pid, KERN_PROC_PATHNAME, 40 }; 41 return sysctl(name, __arraycount(name), path, &len, NULL, 0); 42} 43 44int 45main(int argc, char *argv[]) 46{ 47 if (argc != 2) { 48 fprintf(stderr, "Usage: %s <pid>\n", getprogname()); 49 return EXIT_FAILURE; 50 } 51 52 char buf[MAXPATHLEN]; 53 pid_t pid = atoi(argv[1]); 54 55 if (getprocpath(buf, sizeof(buf), pid) == -1) 56 err(EXIT_FAILURE, "sysctl: %d", pid); 57 printf("%s\n", buf); 58 return EXIT_SUCCESS; 59} 60