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 #define __USE_BSD 35 36 #include <sys/types.h> 37 #include <sys/stat.h> 38 #include <fcntl.h> 39 #include <stdio.h> 40 #include <errno.h> 41 #include "local.h" 42 #include <linux/stat.h> 43 44 FILE * 45 fopen(const char *file, const char *mode) 46 { 47 FILE *fp; 48 int f; 49 int flags, oflags; 50 51 if ((flags = __sflags(mode, &oflags)) == 0) 52 return (NULL); 53 if ((fp = __sfp()) == NULL) 54 return (NULL); 55 if ((f = open(file, oflags, DEFFILEMODE)) < 0) { 56 fp->_flags = 0; /* release */ 57 return (NULL); 58 } 59 fp->_file = f; 60 fp->_flags = flags; 61 fp->_cookie = fp; 62 fp->_read = __sread; 63 fp->_write = __swrite; 64 fp->_seek = __sseek; 65 fp->_close = __sclose; 66 67 /* 68 * When opening in append mode, even though we use O_APPEND, 69 * we need to seek to the end so that ftell() gets the right 70 * answer. If the user then alters the seek pointer, or 71 * the file extends, this will fail, but there is not much 72 * we can do about this. (We could set __SAPP and check in 73 * fseek and ftell.) 74 */ 75 if (oflags & O_APPEND) 76 (void) __sseek((void *)fp, (fpos_t)0, SEEK_END); 77 return (fp); 78 } 79
