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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if defined(LIBC_SCCS) && !defined(lint) 35 static char rcsid[] = "$OpenBSD: perror.c,v 1.4 2002/02/16 21:27:24 millert Exp $"; 36 #endif /* LIBC_SCCS and not lint */ 37 38 #include <sys/types.h> 39 #include <sys/uio.h> 40 #include <unistd.h> 41 #include <errno.h> 42 #include <stdio.h> 43 #include <string.h> 44 #include <limits.h> 45 /* 46 * Since perror() is not allowed to change the contents of strerror()'s 47 * static buffer, both functions supply their own buffers to the 48 * internal function __strerror(). 49 */ 50 51 extern char *__strerror(int , char *); 52 53 void 54 perror(s) 55 const char *s; 56 { 57 register struct iovec *v; 58 struct iovec iov[4]; 59 char buf[NL_TEXTMAX]; 60 61 v = iov; 62 if (s && *s) { 63 v->iov_base = (char *)s; 64 v->iov_len = strlen(s); 65 v++; 66 v->iov_base = ": "; 67 v->iov_len = 2; 68 v++; 69 } 70 v->iov_base = __strerror(errno, buf); 71 v->iov_len = strlen(v->iov_base); 72 v++; 73 v->iov_base = "\n"; 74 v->iov_len = 1; 75 (void)writev(STDERR_FILENO, iov, (v - iov) + 1); 76 } 77