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Annotation of src/lib/libc/resolv/herror.c, Revision 1.9

1.9     ! christos    1: /*     $NetBSD: herror.c,v 1.8 2009/04/12 17:07:17 christos Exp $      */
1.1       christos    2:
                      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:
                     36: /*
                     37:  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
                     38:  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
                     39:  *
                     40:  * Permission to use, copy, modify, and distribute this software for any
                     41:  * purpose with or without fee is hereby granted, provided that the above
                     42:  * copyright notice and this permission notice appear in all copies.
                     43:  *
                     44:  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
                     45:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     46:  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
                     47:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     48:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     49:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
                     50:  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     51:  */
                     52:
1.3       christos   53: #include <sys/cdefs.h>
1.1       christos   54: #if defined(LIBC_SCCS) && !defined(lint)
1.3       christos   55: #ifdef notdef
1.7       christos   56: static const char sccsid[] = "@(#)herror.c     8.1 (Berkeley) 6/4/93";
                     57: static const char rcsid[] = "Id: herror.c,v 1.4 2005/04/27 04:56:41 sra Exp";
1.3       christos   58: #else
1.9     ! christos   59: __RCSID("$NetBSD: herror.c,v 1.8 2009/04/12 17:07:17 christos Exp $");
1.3       christos   60: #endif
1.1       christos   61: #endif /* LIBC_SCCS and not lint */
                     62:
                     63: #include "port_before.h"
                     64:
1.4       christos   65: #include "namespace.h"
1.1       christos   66: #include <sys/types.h>
                     67: #include <sys/param.h>
                     68: #include <sys/uio.h>
                     69:
                     70: #include <netinet/in.h>
                     71: #include <arpa/nameser.h>
                     72:
                     73: #include <netdb.h>
                     74: #include <resolv.h>
                     75: #include <string.h>
                     76: #include <unistd.h>
                     77:
                     78: #include "port_after.h"
                     79:
                     80: const char *h_errlist[] = {
                     81:        "Resolver Error 0 (no error)",
1.5       christos   82:        "Unknown host",                         /*%< 1 HOST_NOT_FOUND */
                     83:        "Host name lookup failure",             /*%< 2 TRY_AGAIN */
                     84:        "Unknown server error",                 /*%< 3 NO_RECOVERY */
                     85:        "No address associated with name",      /*%< 4 NO_ADDRESS */
1.1       christos   86: };
                     87: int    h_nerr = { sizeof h_errlist / sizeof h_errlist[0] };
                     88:
                     89: #if !(__GLIBC__ > 2 || __GLIBC__ == 2 &&  __GLIBC_MINOR__ >= 3)
                     90: #undef h_errno
                     91: int    h_errno;
                     92: #endif
                     93:
1.4       christos   94: #ifdef __weak_alias
                     95: __weak_alias(herror,_herror)
                     96: #endif
                     97:
1.5       christos   98: /*%
1.1       christos   99:  * herror --
                    100:  *     print the error indicated by the h_errno value.
                    101:  */
                    102: void
                    103: herror(const char *s) {
                    104:        struct iovec iov[4], *v = iov;
                    105:        char *t;
                    106:
                    107:        if (s != NULL && *s != '\0') {
                    108:                DE_CONST(s, t);
                    109:                v->iov_base = t;
                    110:                v->iov_len = strlen(t);
                    111:                v++;
                    112:                DE_CONST(": ", t);
                    113:                v->iov_base = t;
                    114:                v->iov_len = 2;
                    115:                v++;
                    116:        }
1.7       christos  117:        DE_CONST(hstrerror(*__h_errno()), t);
1.1       christos  118:        v->iov_base = t;
                    119:        v->iov_len = strlen(v->iov_base);
                    120:        v++;
                    121:        DE_CONST("\n", t);
                    122:        v->iov_base = t;
                    123:        v->iov_len = 1;
1.9     ! christos  124:        (void)writev(STDERR_FILENO, iov, (int)((v - iov) + 1));
1.1       christos  125: }
                    126:
1.5       christos  127: /*%
1.1       christos  128:  * hstrerror --
                    129:  *     return the string associated with a given "host" errno value.
                    130:  */
                    131: const char *
                    132: hstrerror(int err) {
                    133:        if (err < 0)
                    134:                return ("Resolver internal error");
                    135:        else if (err < h_nerr)
                    136:                return (h_errlist[err]);
                    137:        return ("Unknown resolver error");
                    138: }
1.5       christos  139:
                    140: /*! \file */

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