stdio/FreeBSD/perror.c

   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  * 4. 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)
  31 static 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: src/lib/libc/stdio/perror.c,v 1.9 2007/01/09 00:28:07 imp Exp $");
  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
  48 void
  49 perror(s)
  50         const char *s;
  51 {
  52         char msgbuf[NL_TEXTMAX];
  53         struct iovec *v;
  54         struct iovec iov[4];
  55
  56         v = iov;
  57         if (s != NULL && *s != '\0') {
  58                 v->iov_base = (char *)s;
  59                 v->iov_len = strlen(s);
  60                 v++;
  61                 v->iov_base = ": ";
  62                 v->iov_len = 2;
  63                 v++;
  64         }
  65         strerror_r(errno, msgbuf, sizeof(msgbuf));
  66         v->iov_base = msgbuf;
  67         v->iov_len = strlen(v->iov_base);
  68         v++;
  69         v->iov_base = "\n";
  70         v->iov_len = 1;
  71         FLOCKFILE(stderr);
  72         __sflush(stderr);
  73         (void)_writev(stderr->_file, iov, (v - iov) + 1);
  74         stderr->_flags &= ~__SOFF;
  75         FUNLOCKFILE(stderr);
  76 }