1 /* $NetBSD: perror.c,v 1.18 1998/11/17 16:13:59 christos 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 #include <sys/cdefs.h> 37 #if defined(LIBC_SCCS) && !defined(lint) 38 #if 0 39 static char sccsid[] = "@(#)perror.c 8.1 (Berkeley) 6/4/93"; 40 #else 41 __RCSID("$NetBSD: perror.c,v 1.18 1998/11/17 16:13:59 christos Exp $"); 42 #endif 43 #endif /* LIBC_SCCS and not lint */ 44 45 #include "namespace.h" 46 47 #include <sys/types.h> 48 #include <sys/uio.h> 49 50 #include <errno.h> 51 #include <limits.h> 52 #include <stdio.h> 53 #include <string.h> 54 #include <unistd.h> 55 56 #include "extern.h" 57 58 /* 59 * Since perror() is not allowed to change the contents of strerror()'s 60 * static buffer, both functions supply their own buffers to the 61 * internal function __strerror(). 62 */ 63 64 #ifdef __weak_alias 65 __weak_alias(perror,_perror); 66 #endif 67 68 void 69 perror(s) 70 const char *s; 71 { 72 struct iovec *v; 73 struct iovec iov[4]; 74 char buf[NL_TEXTMAX]; 75 76 v = iov; 77 if (s && *s) { 78 /* LINTED we don't touch the string */ 79 v->iov_base = (void *)s; 80 v->iov_len = strlen(s); 81 v++; 82 v->iov_base = ": "; 83 v->iov_len = 2; 84 v++; 85 } 86 /* LINTED we don't touch the string */ 87 v->iov_base = (void *)__strerror(errno, buf, sizeof(buf)); 88 v->iov_len = strlen(v->iov_base); 89 v++; 90 v->iov_len = 1; 91 v->iov_base = "\n"; 92 (void)writev(STDERR_FILENO, iov, (v - iov) + 1); 93 } 94