Annotation of src/lib/libc/resolv/herror.c, Revision 1.10
1.10 ! christos 1: /* $NetBSD: herror.c,v 1.9 2012/03/13 21:13:43 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.
1.10 ! christos 15: * 3. Neither the name of the University nor the names of its contributors
1.1 christos 16: * may be used to endorse or promote products derived from this software
17: * without specific prior written permission.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29: * SUCH DAMAGE.
30: */
31:
32: /*
33: * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
34: * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
35: *
36: * Permission to use, copy, modify, and distribute this software for any
37: * purpose with or without fee is hereby granted, provided that the above
38: * copyright notice and this permission notice appear in all copies.
39: *
40: * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
41: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
42: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
43: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
44: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
45: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
46: * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
47: */
48:
1.3 christos 49: #include <sys/cdefs.h>
1.1 christos 50: #if defined(LIBC_SCCS) && !defined(lint)
1.3 christos 51: #ifdef notdef
1.7 christos 52: static const char sccsid[] = "@(#)herror.c 8.1 (Berkeley) 6/4/93";
53: static const char rcsid[] = "Id: herror.c,v 1.4 2005/04/27 04:56:41 sra Exp";
1.3 christos 54: #else
1.10 ! christos 55: __RCSID("$NetBSD: herror.c,v 1.9 2012/03/13 21:13:43 christos Exp $");
1.3 christos 56: #endif
1.1 christos 57: #endif /* LIBC_SCCS and not lint */
58:
59: #include "port_before.h"
60:
1.4 christos 61: #include "namespace.h"
1.1 christos 62: #include <sys/types.h>
63: #include <sys/param.h>
64: #include <sys/uio.h>
65:
66: #include <netinet/in.h>
67: #include <arpa/nameser.h>
68:
69: #include <netdb.h>
70: #include <resolv.h>
71: #include <string.h>
72: #include <unistd.h>
73:
74: #include "port_after.h"
75:
76: const char *h_errlist[] = {
77: "Resolver Error 0 (no error)",
1.5 christos 78: "Unknown host", /*%< 1 HOST_NOT_FOUND */
79: "Host name lookup failure", /*%< 2 TRY_AGAIN */
80: "Unknown server error", /*%< 3 NO_RECOVERY */
81: "No address associated with name", /*%< 4 NO_ADDRESS */
1.1 christos 82: };
83: int h_nerr = { sizeof h_errlist / sizeof h_errlist[0] };
84:
85: #if !(__GLIBC__ > 2 || __GLIBC__ == 2 && __GLIBC_MINOR__ >= 3)
86: #undef h_errno
87: int h_errno;
88: #endif
89:
1.4 christos 90: #ifdef __weak_alias
91: __weak_alias(herror,_herror)
92: #endif
93:
1.5 christos 94: /*%
1.1 christos 95: * herror --
96: * print the error indicated by the h_errno value.
97: */
98: void
99: herror(const char *s) {
100: struct iovec iov[4], *v = iov;
101: char *t;
102:
103: if (s != NULL && *s != '\0') {
104: DE_CONST(s, t);
105: v->iov_base = t;
106: v->iov_len = strlen(t);
107: v++;
108: DE_CONST(": ", t);
109: v->iov_base = t;
110: v->iov_len = 2;
111: v++;
112: }
1.7 christos 113: DE_CONST(hstrerror(*__h_errno()), t);
1.1 christos 114: v->iov_base = t;
115: v->iov_len = strlen(v->iov_base);
116: v++;
117: DE_CONST("\n", t);
118: v->iov_base = t;
119: v->iov_len = 1;
1.9 christos 120: (void)writev(STDERR_FILENO, iov, (int)((v - iov) + 1));
1.1 christos 121: }
122:
1.5 christos 123: /*%
1.1 christos 124: * hstrerror --
125: * return the string associated with a given "host" errno value.
126: */
127: const char *
128: hstrerror(int err) {
129: if (err < 0)
130: return ("Resolver internal error");
131: else if (err < h_nerr)
132: return (h_errlist[err]);
133: return ("Unknown resolver error");
134: }
1.5 christos 135:
136: /*! \file */
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