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
42 FILE *
fopen(const char * file,const char * mode)43 fopen(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