2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1990, 1993
5 * The Regents of the University of California. All rights reserved.
7 * This code is derived from software contributed to Berkeley by
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 #if defined(LIBC_SCCS) && !defined(lint)
36 static char sccsid[] = "@(#)fopen.c 8.1 (Berkeley) 6/4/93";
37 #endif /* LIBC_SCCS and not lint */
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
41 #include "namespace.h"
42 #include <sys/types.h>
49 #include "un-namespace.h"
54 fopen(const char * __restrict file, const char * __restrict mode)
60 if ((flags = __sflags(mode, &oflags)) == 0)
62 if ((fp = __sfp()) == NULL)
64 if ((f = _open(file, oflags, DEFFILEMODE)) < 0) {
65 fp->_flags = 0; /* release */
69 * File descriptors are a full int, but _file is only a short.
70 * If we get a valid file descriptor that is greater than
71 * SHRT_MAX, then the fd will get sign-extended into an
72 * invalid file descriptor. Handle this case by failing the
76 fp->_flags = 0; /* release */
85 fp->_write = __swrite;
87 fp->_close = __sclose;
89 * When opening in append mode, even though we use O_APPEND,
90 * we need to seek to the end so that ftell() gets the right
91 * answer. If the user then alters the seek pointer, or
92 * the file extends, this will fail, but there is not much
93 * we can do about this. (We could set __SAPP and check in
96 if (oflags & O_APPEND) {
97 fp->_flags2 |= __S2OAP;
98 (void)_sseek(fp, (fpos_t)0, SEEK_END);