perror.c revision 331722 
1/*
2 * Copyright (c) 1988, 1993
3 *	The Regents of the University of California.  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. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#if defined(LIBC_SCCS) && !defined(lint)
31static char sccsid[] = "@(#)perror.c	8.1 (Berkeley) 6/4/93";
32#endif /* LIBC_SCCS and not lint */
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD: stable/11/lib/libc/stdio/perror.c 331722 2018-03-29 02:50:57Z eadler $");
35
36#include "namespace.h"
37#include <sys/types.h>
38#include <sys/uio.h>
39#include <unistd.h>
40#include <errno.h>
41#include <limits.h>
42#include <stdio.h>
43#include <string.h>
44#include "un-namespace.h"
45#include "libc_private.h"
46#include "local.h"
47
48void
49perror(const char *s)
50{
51	char msgbuf[NL_TEXTMAX];
52	struct iovec *v;
53	struct iovec iov[4];
54
55	v = iov;
56	if (s != NULL && *s != '\0') {
57		v->iov_base = (char *)s;
58		v->iov_len = strlen(s);
59		v++;
60		v->iov_base = ": ";
61		v->iov_len = 2;
62		v++;
63	}
64	strerror_r(errno, msgbuf, sizeof(msgbuf));
65	v->iov_base = msgbuf;
66	v->iov_len = strlen(v->iov_base);
67	v++;
68	v->iov_base = "\n";
69	v->iov_len = 1;
70	FLOCKFILE_CANCELSAFE(stderr);
71	__sflush(stderr);
72	(void)_writev(stderr->_file, iov, (v - iov) + 1);
73	stderr->_flags &= ~__SOFF;
74	FUNLOCKFILE_CANCELSAFE();
75}
76