1 /*
2 * Copyright (c) 1987 Regents of the University of California.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 #if defined(LIBC_SCCS) && !defined(lint)
35 static char sccsid[] = "@(#)herror.c 6.6 (Berkeley) 2/24/91";
36 #endif /* LIBC_SCCS and not lint */
37
38 #include <sys/types.h>
39 #include <sys/uio.h>
40 #include <netdb.h>
41 #include <unistd.h>
42 #include <string.h>
43
44 char *h_errlist[] = {
45 "Error 0",
46 "Unknown host", /* 1 HOST_NOT_FOUND */
47 "Host name lookup failure", /* 2 TRY_AGAIN */
48 "Unknown server error", /* 3 NO_RECOVERY */
49 "No address associated with name", /* 4 NO_ADDRESS */
50 };
51 int h_nerr = { sizeof(h_errlist)/sizeof(h_errlist[0]) };
52
53 extern int h_errno;
54
55 /*
56 * herror --
57 * print the error indicated by the h_errno value.
58 */
59 void
herror(s)60 herror(s)
61 const char *s;
62 {
63 struct iovec iov[4];
64 register struct iovec *v = iov;
65
66 if (s && *s) {
67 v->iov_base = (char *)s;
68 v->iov_len = strlen(s);
69 v++;
70 v->iov_base = ": ";
71 v->iov_len = 2;
72 v++;
73 }
74 v->iov_base = (u_int)h_errno < h_nerr ?
75 h_errlist[h_errno] : "Unknown error";
76 v->iov_len = strlen(v->iov_base);
77 v++;
78 v->iov_base = "\n";
79 v->iov_len = 1;
80 writev(STDERR_FILENO, iov, (v - iov) + 1);
81 }
82