1 /* 2 * Copyright (c) 1988 Regents of the University of California. 3 * 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 *sccsid = "from: @(#)perror.c 5.11 (Berkeley) 2/24/91";*/ 36 static char *rcsid = "$Id: perror.c,v 1.5 1993/10/09 00:11:19 jtc Exp $"; 37 #endif /* LIBC_SCCS and not lint */ 38 39 #include <sys/types.h> 40 #include <sys/uio.h> 41 #include <unistd.h> 42 #include <errno.h> 43 #include <stdio.h> 44 #include <string.h> 45 46 /* 47 * Since perror() is not allowed to change the contents of strerror()'s 48 * static buffer, both functions supply their own buffers to the 49 * internal function __strerror(). 50 */ 51 52 extern char *__strerror __P((int , char *)); 53 54 void 55 perror(s) 56 const char *s; 57 { 58 register struct iovec *v; 59 struct iovec iov[4]; 60 static char buf[40]; 61 62 v = iov; 63 if (s && *s) { 64 v->iov_base = (char *)s; 65 v->iov_len = strlen(s); 66 v++; 67 v->iov_base = ": "; 68 v->iov_len = 2; 69 v++; 70 } 71 v->iov_base = __strerror(errno, buf); 72 v->iov_len = strlen(v->iov_base); 73 v++; 74 v->iov_base = "\n"; 75 v->iov_len = 1; 76 (void)writev(STDERR_FILENO, iov, (v - iov) + 1); 77 } 78