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freebsd/lib/libc/stdio/perror.c
Tim J. Robbins 37d2356335 Write the message to stderr, not file descriptor 2, so that perror()
writes to the correct stream if stderr has been redirected with freopen().
2002-12-19 09:53:26 +00:00

81 lines
2.7 KiB
C

/*
* Copyright (c) 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)perror.c 8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "namespace.h"
#include <sys/types.h>
#include <sys/uio.h>
#include <unistd.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include "un-namespace.h"
#include "libc_private.h"
#include "local.h"
void
perror(s)
const char *s;
{
char msgbuf[NL_TEXTMAX];
struct iovec *v;
struct iovec iov[4];
v = iov;
if (s != NULL && *s != '\0') {
v->iov_base = (char *)s;
v->iov_len = strlen(s);
v++;
v->iov_base = ": ";
v->iov_len = 2;
v++;
}
strerror_r(errno, msgbuf, sizeof(msgbuf));
v->iov_base = msgbuf;
v->iov_len = strlen(v->iov_base);
v++;
v->iov_base = "\n";
v->iov_len = 1;
FLOCKFILE(stderr);
__sflush(stderr);
(void)_writev(stderr->_file, iov, (v - iov) + 1);
stderr->_flags &= ~__SOFF;
FUNLOCKFILE(stderr);
}