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. 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 rcsid[] = "$OpenBSD: perror.c,v 1.5 2003/06/02 20:18:37 millert Exp $"; 32 #endif /* LIBC_SCCS and not lint */ 33 34 #include <sys/types.h> 35 #include <sys/uio.h> 36 #include <unistd.h> 37 #include <errno.h> 38 #include <stdio.h> 39 #include <string.h> 40 #include <limits.h> 41 /* 42 * Since perror() is not allowed to change the contents of strerror()'s 43 * static buffer, both functions supply their own buffers to the 44 * internal function __strerror(). 45 */ 46 47 extern char *__strerror(int , char *); 48 49 void 50 perror(s) 51 const char *s; 52 { 53 register struct iovec *v; 54 struct iovec iov[4]; 55 char buf[NL_TEXTMAX]; 56 57 v = iov; 58 if (s && *s) { 59 v->iov_base = (char *)s; 60 v->iov_len = strlen(s); 61 v++; 62 v->iov_base = ": "; 63 v->iov_len = 2; 64 v++; 65 } 66 v->iov_base = __strerror(errno, buf); 67 v->iov_len = strlen(v->iov_base); 68 v++; 69 v->iov_base = "\n"; 70 v->iov_len = 1; 71 (void)writev(STDERR_FILENO, iov, (v - iov) + 1); 72 } 73