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perror.c revision 1.8 
      1 /*	$NetBSD: perror.c,v 1.8 1995/02/02 02:10:11 jtc Exp $	*/
      2 
      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. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #if defined(LIBC_SCCS) && !defined(lint)
     37 #if 0
     38 static char sccsid[] = "@(#)perror.c	8.1 (Berkeley) 6/4/93";
     39 #endif
     40 static char rcsid[] = "$NetBSD: perror.c,v 1.8 1995/02/02 02:10:11 jtc Exp $";
     41 #endif /* LIBC_SCCS and not lint */
     42 
     43 #include <sys/types.h>
     44 #include <sys/uio.h>
     45 #include <unistd.h>
     46 #include <errno.h>
     47 #include <stdio.h>
     48 #include <string.h>
     49 #include <limits.h>
     50 /*
     51  * Since perror() is not allowed to change the contents of strerror()'s
     52  * static buffer, both functions supply their own buffers to the
     53  * internal function __strerror().
     54  */
     55 
     56 extern char *__strerror __P((int , char *));
     57 
     58 void
     59 perror(s)
     60 	const char *s;
     61 {
     62 	register struct iovec *v;
     63 	struct iovec iov[4];
     64 	static char buf[NL_TEXTMAX];
     65 
     66 	v = iov;
     67 	if (s && *s) {
     68 		v->iov_base = (char *)s;
     69 		v->iov_len = strlen(s);
     70 		v++;
     71 		v->iov_base = ": ";
     72 		v->iov_len = 2;
     73 		v++;
     74 	}
     75 	v->iov_base = __strerror(errno, buf);
     76 	v->iov_len = strlen(v->iov_base);
     77 	v++;
     78 	v->iov_base = "\n";
     79 	v->iov_len = 1;
     80 	(void)writev(STDERR_FILENO, iov, (v - iov) + 1);
     81 }
     82