1/* $OpenBSD: fopen.c,v 1.5 2005/08/08 08:05:36 espie Exp $ */ 2/*- 3 * Copyright (c) 1990, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * Chris Torek. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. 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#include <sys/types.h> 35#include <sys/stat.h> 36#include <fcntl.h> 37#include <stdio.h> 38#include <errno.h> 39#include "local.h" 40#include <linux/stat.h> 41 42FILE * 43fopen(const char *file, const char *mode) 44{ 45 FILE *fp; 46 int f; 47 int flags, oflags; 48 49 if ((flags = __sflags(mode, &oflags)) == 0) 50 return (NULL); 51 if ((fp = __sfp()) == NULL) 52 return (NULL); 53 if ((f = open(file, oflags, DEFFILEMODE)) < 0) { 54 fp->_flags = 0; /* release */ 55 return (NULL); 56 } 57 fp->_file = f; 58 fp->_flags = flags; 59 fp->_cookie = fp; 60 fp->_read = __sread; 61 fp->_write = __swrite; 62 fp->_seek = __sseek; 63 fp->_close = __sclose; 64 65 /* 66 * When opening in append mode, even though we use O_APPEND, 67 * we need to seek to the end so that ftell() gets the right 68 * answer. If the user then alters the seek pointer, or 69 * the file extends, this will fail, but there is not much 70 * we can do about this. (We could set __SAPP and check in 71 * fseek and ftell.) 72 */ 73 if (oflags & O_APPEND) 74 (void) __sseek((void *)fp, (fpos_t)0, SEEK_END); 75 return (fp); 76} 77