1 /* $OpenBSD: perror.c,v 1.9 2015/08/31 02:53:57 guenther Exp $ */
2 /*
3 * Copyright (c) 1988, 1993
4 * The Regents of the University of California. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the University nor the names of its contributors
15 * may be used to endorse or promote products derived from this software
16 * without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31 #include <sys/types.h>
32 #include <sys/uio.h>
33 #include <unistd.h>
34 #include <errno.h>
35 #include <stdio.h>
36 #include <string.h>
37 #include <limits.h>
38
39 void
perror(const char * s)40 perror(const char *s)
41 {
42 struct iovec *v;
43 struct iovec iov[4];
44 char buf[NL_TEXTMAX];
45
46 v = iov;
47 if (s && *s) {
48 v->iov_base = (char *)s;
49 v->iov_len = strlen(s);
50 v++;
51 v->iov_base = ": ";
52 v->iov_len = 2;
53 v++;
54 }
55 (void)strerror_r(errno, buf, sizeof(buf));
56 v->iov_base = buf;
57 v->iov_len = strlen(v->iov_base);
58 v++;
59 v->iov_base = "\n";
60 v->iov_len = 1;
61 (void)writev(STDERR_FILENO, iov, (v - iov) + 1);
62 }
63 DEF_STRONG(perror);
64