1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1988, 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. Neither the name of the University nor the names of its contributors
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#if defined(LIBC_SCCS) && !defined(lint)
33static char sccsid[] = "@(#)perror.c	8.1 (Berkeley) 6/4/93";
34#endif /* LIBC_SCCS and not lint */
35#include <sys/cdefs.h>
36__FBSDID("$FreeBSD$");
37
38#include "namespace.h"
39#include <sys/types.h>
40#include <sys/uio.h>
41#include <unistd.h>
42#include <errno.h>
43#include <limits.h>
44#include <stdio.h>
45#include <string.h>
46#include "un-namespace.h"
47#include "libc_private.h"
48#include "local.h"
49
50void
51perror(const char *s)
52{
53	char msgbuf[NL_TEXTMAX];
54	struct iovec *v;
55	struct iovec iov[4];
56
57	v = iov;
58	if (s != NULL && *s != '\0') {
59		v->iov_base = (char *)s;
60		v->iov_len = strlen(s);
61		v++;
62		v->iov_base = ": ";
63		v->iov_len = 2;
64		v++;
65	}
66	strerror_r(errno, msgbuf, sizeof(msgbuf));
67	v->iov_base = msgbuf;
68	v->iov_len = strlen(v->iov_base);
69	v++;
70	v->iov_base = "\n";
71	v->iov_len = 1;
72	FLOCKFILE_CANCELSAFE(stderr);
73	__sflush(stderr);
74	(void)_writev(stderr->_file, iov, (v - iov) + 1);
75	stderr->_flags &= ~__SOFF;
76	FUNLOCKFILE_CANCELSAFE();
77}
78