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/* $OpenBSD: herror.c,v 1.10 2015/09/14 07:38:38 guenther Exp $ */ |
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/* |
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* ++Copyright++ 1987, 1993 |
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* - |
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* Copyright (c) 1987, 1993 |
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* The Regents of the University of California. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of the University nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* - |
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* Portions Copyright (c) 1993 by Digital Equipment Corporation. |
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* |
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* Permission to use, copy, modify, and distribute this software for any |
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* purpose with or without fee is hereby granted, provided that the above |
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* copyright notice and this permission notice appear in all copies, and that |
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* the name of Digital Equipment Corporation not be used in advertising or |
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* publicity pertaining to distribution of the document or software without |
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* specific, written prior permission. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL |
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* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT |
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* CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS |
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
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* SOFTWARE. |
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* - |
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* --Copyright-- |
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*/ |
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#include <sys/types.h> |
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#include <sys/uio.h> |
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#include <netdb.h> |
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#include <unistd.h> |
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#include <string.h> |
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const char * const h_errlist[] = { |
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"Resolver Error 0 (no error)", |
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"Unknown host", /* 1 HOST_NOT_FOUND */ |
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"Host name lookup failure", /* 2 TRY_AGAIN */ |
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"Unknown server error", /* 3 NO_RECOVERY */ |
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"No address associated with name", /* 4 NO_ADDRESS */ |
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}; |
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const int h_nerr = { sizeof h_errlist / sizeof h_errlist[0] }; |
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extern int h_errno; |
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/* |
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* herror -- |
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* print the error indicated by the h_errno value. |
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*/ |
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void |
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herror(const char *s) |
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{ |
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struct iovec iov[4]; |
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struct iovec *v = iov; |
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if (s && *s) { |
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v->iov_base = (char *)s; |
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v->iov_len = strlen(s); |
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v++; |
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v->iov_base = ": "; |
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v->iov_len = 2; |
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v++; |
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} |
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v->iov_base = (char *)hstrerror(h_errno); |
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v->iov_len = strlen(v->iov_base); |
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v++; |
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v->iov_base = "\n"; |
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v->iov_len = 1; |
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writev(STDERR_FILENO, iov, (v - iov) + 1); |
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} |
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const char * |
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hstrerror(int err) |
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{ |
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if (err < 0) |
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return ("Resolver internal error"); |
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else if (err < h_nerr) |
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return (h_errlist[err]); |
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return ("Unknown resolver error"); |
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} |
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DEF_WEAK(hstrerror); |