1/*
2 * Copyright (C) 2008 The Android Open Source Project
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 *  * Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 *  * Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in
12 *    the documentation and/or other materials provided with the
13 *    distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <fcntl.h>
30#include <stdarg.h>
31#include <stdlib.h>
32#include <unistd.h>
33
34#include "private/libc_logging.h"
35
36extern "C" int __openat(int, const char*, int, int);
37
38static inline int force_O_LARGEFILE(int flags) {
39#if __LP64__
40  return flags; // No need, and aarch64's strace gets confused.
41#else
42  return flags | O_LARGEFILE;
43#endif
44}
45
46int creat(const char* pathname, mode_t mode) {
47  return open(pathname, O_CREAT | O_TRUNC | O_WRONLY, mode);
48}
49__strong_alias(creat64, creat);
50
51int open(const char* pathname, int flags, ...) {
52  mode_t mode = 0;
53
54  if ((flags & O_CREAT) != 0) {
55    va_list args;
56    va_start(args, flags);
57    mode = static_cast<mode_t>(va_arg(args, int));
58    va_end(args);
59  }
60
61  return __openat(AT_FDCWD, pathname, force_O_LARGEFILE(flags), mode);
62}
63__strong_alias(open64, open);
64
65int __open_2(const char* pathname, int flags) {
66  if (__predict_false((flags & O_CREAT) != 0)) {
67    __fortify_chk_fail("open(O_CREAT): called without specifying a mode", 0);
68  }
69
70  return __openat(AT_FDCWD, pathname, force_O_LARGEFILE(flags), 0);
71}
72
73int openat(int fd, const char *pathname, int flags, ...) {
74  mode_t mode = 0;
75
76  if ((flags & O_CREAT) != 0) {
77    va_list args;
78    va_start(args, flags);
79    mode = static_cast<mode_t>(va_arg(args, int));
80    va_end(args);
81  }
82
83  return __openat(fd, pathname, force_O_LARGEFILE(flags), mode);
84}
85__strong_alias(openat64, openat);
86
87int __openat_2(int fd, const char* pathname, int flags) {
88  if ((flags & O_CREAT) != 0) {
89    __fortify_chk_fail("openat(O_CREAT): called without specifying a mode", 0);
90  }
91
92  return __openat(fd, pathname, force_O_LARGEFILE(flags), 0);
93}
94