1 /*- 2 * Copyright (c) 1987, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * - 7 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 8 * 9 * Permission to use, copy, modify, and distribute this software for any 10 * purpose with or without fee is hereby granted, provided that the above 11 * copyright notice and this permission notice appear in all copies, and that 12 * the name of Digital Equipment Corporation not be used in advertising or 13 * publicity pertaining to distribution of the document or software without 14 * specific, written prior permission. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 17 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 19 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 20 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 21 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 22 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 23 * SOFTWARE. 24 * - 25 * --Copyright-- 26 */ 27 28 #if defined(LIBC_SCCS) && !defined(lint) 29 static char sccsid[] = "@(#)herror.c 8.1 (Berkeley) 06/04/93"; 30 static char rcsid[] = "$Id: herror.c,v 4.9.1.1 1993/05/02 23:14:35 vixie Rel $"; 31 #endif /* LIBC_SCCS and not lint */ 32 33 #include <sys/types.h> 34 #include <sys/uio.h> 35 #include <netdb.h> 36 #include <unistd.h> 37 #include <string.h> 38 39 char *h_errlist[] = { 40 "Error 0", 41 "Unknown host", /* 1 HOST_NOT_FOUND */ 42 "Host name lookup failure", /* 2 TRY_AGAIN */ 43 "Unknown server error", /* 3 NO_RECOVERY */ 44 "No address associated with name", /* 4 NO_ADDRESS */ 45 }; 46 int h_nerr = { sizeof(h_errlist)/sizeof(h_errlist[0]) }; 47 48 extern int h_errno; 49 50 /* 51 * herror -- 52 * print the error indicated by the h_errno value. 53 */ 54 void 55 herror(s) 56 const char *s; 57 { 58 struct iovec iov[4]; 59 register struct iovec *v = iov; 60 61 if (s && *s) { 62 v->iov_base = (char *)s; 63 v->iov_len = strlen(s); 64 v++; 65 v->iov_base = ": "; 66 v->iov_len = 2; 67 v++; 68 } 69 v->iov_base = (u_int)h_errno < h_nerr ? 70 h_errlist[h_errno] : "Unknown error"; 71 v->iov_len = strlen(v->iov_base); 72 v++; 73 v->iov_base = "\n"; 74 v->iov_len = 1; 75 writev(STDERR_FILENO, iov, (v - iov) + 1); 76 } 77 78 char * 79 hstrerror(err) 80 int err; 81 { 82 return (u_int)err < h_nerr ? h_errlist[err] : "Unknown resolver error"; 83 } 84