1 /*
2 * Copyright (C) 2017 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 #ifndef _FCNTL_H
30 #error "Never include this file directly; instead, include <fcntl.h>"
31 #endif
32
33 int __open_2(const char*, int) __INTRODUCED_IN(17);
34 int __openat_2(int, const char*, int) __INTRODUCED_IN(17);
35 /*
36 * These are the easiest way to call the real open even in clang FORTIFY.
37 */
38 int __open_real(const char*, int, ...) __RENAME(open);
39 int __openat_real(int, const char*, int, ...) __RENAME(openat);
40
41 #if defined(__BIONIC_FORTIFY)
42 #define __open_too_many_args_error "too many arguments"
43 #define __open_too_few_args_error "called with O_CREAT or O_TMPFILE, but missing mode"
44 #define __open_useless_modes_warning "has superfluous mode bits; missing O_CREAT?"
45 /* O_TMPFILE shares bits with O_DIRECTORY. */
46 #define __open_modes_useful(flags) (((flags) & O_CREAT) || ((flags) & O_TMPFILE) == O_TMPFILE)
47
48 #if __ANDROID_API__ >= __ANDROID_API_J_MR1__
49 __BIONIC_ERROR_FUNCTION_VISIBILITY
50 int open(const char* pathname, int flags, mode_t modes, ...) __overloadable
51 __errorattr(__open_too_many_args_error);
52
53 /*
54 * pass_object_size serves two purposes here, neither of which involve __bos: it
55 * disqualifies this function from having its address taken (so &open works),
56 * and it makes overload resolution prefer open(const char *, int) over
57 * open(const char *, int, ...).
58 */
59 __BIONIC_FORTIFY_INLINE
open(const char * const __pass_object_size pathname,int flags)60 int open(const char* const __pass_object_size pathname, int flags)
61 __overloadable
62 __clang_error_if(__open_modes_useful(flags), "'open' " __open_too_few_args_error) {
63 return __open_2(pathname, flags);
64 }
65
66 __BIONIC_FORTIFY_INLINE
open(const char * const __pass_object_size pathname,int flags,mode_t modes)67 int open(const char* const __pass_object_size pathname, int flags, mode_t modes)
68 __overloadable
69 __clang_warning_if(!__open_modes_useful(flags) && modes,
70 "'open' " __open_useless_modes_warning) {
71 return __open_real(pathname, flags, modes);
72 }
73
74 __BIONIC_ERROR_FUNCTION_VISIBILITY
75 int openat(int dirfd, const char* pathname, int flags, mode_t modes, ...)
76 __overloadable
77 __errorattr(__open_too_many_args_error);
78
79 __BIONIC_FORTIFY_INLINE
openat(int dirfd,const char * const __pass_object_size pathname,int flags)80 int openat(int dirfd, const char* const __pass_object_size pathname, int flags)
81 __overloadable
82 __clang_error_if(__open_modes_useful(flags), "'openat' " __open_too_few_args_error) {
83 return __openat_2(dirfd, pathname, flags);
84 }
85
86 __BIONIC_FORTIFY_INLINE
openat(int dirfd,const char * const __pass_object_size pathname,int flags,mode_t modes)87 int openat(int dirfd, const char* const __pass_object_size pathname, int flags, mode_t modes)
88 __overloadable
89 __clang_warning_if(!__open_modes_useful(flags) && modes,
90 "'openat' " __open_useless_modes_warning) {
91 return __openat_real(dirfd, pathname, flags, modes);
92 }
93 #endif /* __ANDROID_API__ >= __ANDROID_API_J_MR1__ */
94
95 #undef __open_too_many_args_error
96 #undef __open_too_few_args_error
97 #undef __open_useless_modes_warning
98 #undef __open_modes_useful
99 #endif /* defined(__BIONIC_FORTIFY) */
100