1/* 2 * ++Copyright++ 1987, 1993 3 * - 4 * Copyright (c) 1987, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * - 35 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 36 * 37 * Permission to use, copy, modify, and distribute this software for any 38 * purpose with or without fee is hereby granted, provided that the above 39 * copyright notice and this permission notice appear in all copies, and that 40 * the name of Digital Equipment Corporation not be used in advertising or 41 * publicity pertaining to distribution of the document or software without 42 * specific, written prior permission. 43 * 44 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 45 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 46 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 47 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 48 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 49 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 50 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 51 * SOFTWARE. 52 * - 53 * --Copyright-- 54 */ 55 56#if defined(LIBC_SCCS) && !defined(lint) 57static char sccsid[] = "@(#)herror.c 8.1 (Berkeley) 6/4/93"; 58static char rcsid[] = "$Id: herror.c,v 1.4 2003/04/10 20:21:16 majka Exp $"; 59#endif /* LIBC_SCCS and not lint */ 60 61#include <sys/param.h> 62#include <sys/uio.h> 63#include <netdb.h> 64#include <string.h> 65#include <unistd.h> 66 67const char * const h_errlist[] = { 68 "Resolver Error 0 (no error)", 69 "Unknown host", /* 1 HOST_NOT_FOUND */ 70 "Host name lookup failure", /* 2 TRY_AGAIN */ 71 "Unknown server error", /* 3 NO_RECOVERY */ 72 "No address associated with name", /* 4 NO_ADDRESS */ 73}; 74const int h_nerr = { sizeof h_errlist / sizeof h_errlist[0] }; 75 76int h_errno; 77 78/* 79 * herror -- 80 * print the error indicated by the h_errno value. 81 */ 82void 83herror(const char *s) 84{ 85 struct iovec iov[4]; 86 register struct iovec *v = iov; 87 88 if (s && *s) { 89 v->iov_base = (char *)s; 90 v->iov_len = strlen(s); 91 v++; 92 v->iov_base = ": "; 93 v->iov_len = 2; 94 v++; 95 } 96 v->iov_base = (char *)hstrerror(h_errno); 97 v->iov_len = strlen(v->iov_base); 98 v++; 99 v->iov_base = "\n"; 100 v->iov_len = 1; 101 writev(STDERR_FILENO, iov, (v - iov) + 1); 102} 103 104const char * 105hstrerror(int err) 106{ 107 if (err < 0) 108 return ("Resolver internal error"); 109 else if (err < h_nerr) 110 return ((char *)h_errlist[err]); 111 return ("Unknown resolver error"); 112} 113