1 /*- 2 * Copyright (c) 2009 Advanced Computing Technologies LLC 3 * Written by: George V. Neville-Neil <gnn@FreeBSD.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <stdio.h> 32 #include <stdlib.h> 33 #include <string.h> 34 #include <err.h> 35 #include <sys/errno.h> 36 37 static void usage(void); 38 39 int 40 main(int argc, char **argv) 41 { 42 char *cp; 43 char *errstr; 44 long errnum; 45 46 if (argc != 2) 47 usage(); 48 49 errno = 0; 50 51 errnum = strtol(argv[1], &cp, 0); 52 53 if (errno != 0) 54 err(1, NULL); 55 56 if ((errstr = strerror(errnum)) == NULL) 57 err(1, NULL); 58 59 printf("%s\n", errstr); 60 61 exit(0); 62 } 63 64 static void 65 usage(void) 66 { 67 fprintf(stderr, "usage: perror number\n"); 68 exit(1); 69 } 70 71