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 #ifndef _FCNTL_H
30 #define _FCNTL_H
31
32 #include <sys/cdefs.h>
33 #include <sys/types.h>
34 #include <linux/fadvise.h>
35 #include <linux/falloc.h>
36 #include <linux/fcntl.h>
37 #include <linux/stat.h>
38 #include <linux/uio.h>
39
40 #include <bits/fcntl.h>
41 #include <bits/seek_constants.h>
42
43 #if defined(__USE_GNU) || defined(__USE_BSD)
44 #include <bits/lockf.h>
45 #endif
46
47 __BEGIN_DECLS
48
49 #ifdef __LP64__
50 /* LP64 kernels don't have F_*64 defines because their flock is 64-bit. */
51 #define F_GETLK64 F_GETLK
52 #define F_SETLK64 F_SETLK
53 #define F_SETLKW64 F_SETLKW
54 #endif
55
56 #define O_ASYNC FASYNC
57 #define O_RSYNC O_SYNC
58
59 #if __ANDROID_API__ >= __ANDROID_API_L__
60 #define SPLICE_F_MOVE 1
61 #define SPLICE_F_NONBLOCK 2
62 #define SPLICE_F_MORE 4
63 #define SPLICE_F_GIFT 8
64 #endif
65
66 #if __ANDROID_API__ >= __ANDROID_API_O__
67 #define SYNC_FILE_RANGE_WAIT_BEFORE 1
68 #define SYNC_FILE_RANGE_WRITE 2
69 #define SYNC_FILE_RANGE_WAIT_AFTER 4
70 #endif
71
72 int creat(const char*, mode_t);
73 int creat64(const char*, mode_t) __INTRODUCED_IN(21);
74 int openat(int, const char*, int, ...) __overloadable
75 __RENAME_CLANG(openat);
76 int openat64(int, const char*, int, ...) __INTRODUCED_IN(21);
77 int open(const char*, int, ...) __overloadable __RENAME_CLANG(open);
78 int open64(const char*, int, ...) __INTRODUCED_IN(21);
79 ssize_t splice(int, off64_t*, int, off64_t*, size_t, unsigned int) __INTRODUCED_IN(21);
80 ssize_t tee(int, int, size_t, unsigned int) __INTRODUCED_IN(21);
81 ssize_t vmsplice(int, const struct iovec*, size_t, unsigned int) __INTRODUCED_IN(21);
82
83 #if defined(__USE_FILE_OFFSET64)
84 int fallocate(int, int, off_t, off_t) __RENAME(fallocate64) __INTRODUCED_IN(21);
85 int posix_fadvise(int, off_t, off_t, int) __RENAME(posix_fadvise64) __INTRODUCED_IN(21);
86 int posix_fallocate(int, off_t, off_t) __RENAME(posix_fallocate64) __INTRODUCED_IN(21);
87 #else
88 int fallocate(int, int, off_t, off_t) __INTRODUCED_IN(21);
89 int posix_fadvise(int, off_t, off_t, int) __INTRODUCED_IN(21);
90 int posix_fallocate(int, off_t, off_t) __INTRODUCED_IN(21);
91 #endif
92 int fallocate64(int, int, off64_t, off64_t) __INTRODUCED_IN(21);
93 int posix_fadvise64(int, off64_t, off64_t, int) __INTRODUCED_IN(21);
94 int posix_fallocate64(int, off64_t, off64_t) __INTRODUCED_IN(21);
95
96 #if defined(__USE_GNU)
97 ssize_t readahead(int, off64_t, size_t) __INTRODUCED_IN(16);
98 int sync_file_range(int, off64_t, off64_t, unsigned int) __INTRODUCED_IN(26);
99 #endif
100
101 int __open_2(const char*, int) __INTRODUCED_IN(17);
102 int __openat_2(int, const char*, int) __INTRODUCED_IN(17);
103 /*
104 * These are the easiest way to call the real open even in clang FORTIFY.
105 */
106 int __open_real(const char*, int, ...) __RENAME(open);
107 int __openat_real(int, const char*, int, ...) __RENAME(openat);
108
109
110 #if defined(__BIONIC_FORTIFY)
111 #define __open_too_many_args_error "too many arguments"
112 #define __open_too_few_args_error "called with O_CREAT, but missing mode"
113 #if defined(__clang__)
114
115 #if __ANDROID_API__ >= __ANDROID_API_J_MR1__
116 __BIONIC_ERROR_FUNCTION_VISIBILITY
117 int open(const char* pathname, int flags, mode_t modes, ...) __overloadable
118 __errorattr(__open_too_many_args_error);
119
120 __BIONIC_ERROR_FUNCTION_VISIBILITY
121 int open(const char* pathname, int flags) __overloadable
122 __enable_if(flags & O_CREAT, __open_too_few_args_error)
123 __errorattr(__open_too_few_args_error);
124
125 /*
126 * pass_object_size serves two purposes here, neither of which involve __bos: it
127 * disqualifies this function from having its address taken (so &open works),
128 * and it makes overload resolution prefer open(const char *, int) over
129 * open(const char *, int, ...).
130 */
131 __BIONIC_FORTIFY_INLINE
open(const char * const __pass_object_size pathname,int flags)132 int open(const char* const __pass_object_size pathname,
133 int flags) __overloadable {
134 return __open_2(pathname, flags);
135 }
136
137 __BIONIC_FORTIFY_INLINE
open(const char * const __pass_object_size pathname,int flags,mode_t modes)138 int open(const char* const __pass_object_size pathname, int flags, mode_t modes)
139 __overloadable {
140 return __open_real(pathname, flags, modes);
141 }
142
143 __BIONIC_ERROR_FUNCTION_VISIBILITY
144 int openat(int dirfd, const char* pathname, int flags) __overloadable
145 __enable_if(flags & O_CREAT, __open_too_few_args_error)
146 __errorattr(__open_too_few_args_error);
147
148 __BIONIC_ERROR_FUNCTION_VISIBILITY
149 int openat(int dirfd, const char* pathname, int flags, mode_t modes, ...)
150 __overloadable
151 __errorattr(__open_too_many_args_error);
152
153 __BIONIC_FORTIFY_INLINE
openat(int dirfd,const char * const __pass_object_size pathname,int flags)154 int openat(int dirfd, const char* const __pass_object_size pathname,
155 int flags) __overloadable {
156 return __openat_2(dirfd, pathname, flags);
157 }
158
159 __BIONIC_FORTIFY_INLINE
openat(int dirfd,const char * const __pass_object_size pathname,int flags,mode_t modes)160 int openat(int dirfd, const char* const __pass_object_size pathname, int flags,
161 mode_t modes) __overloadable {
162 return __openat_real(dirfd, pathname, flags, modes);
163 }
164 #endif /* __ANDROID_API__ >= __ANDROID_API_J_MR1__ */
165
166 #else /* defined(__clang__) */
167 __errordecl(__creat_missing_mode, __open_too_few_args_error);
168 __errordecl(__creat_too_many_args, __open_too_many_args_error);
169
170 #if __ANDROID_API__ >= __ANDROID_API_J_MR1__
171 __BIONIC_FORTIFY_INLINE
open(const char * pathname,int flags,...)172 int open(const char* pathname, int flags, ...) {
173 if (__builtin_constant_p(flags)) {
174 if ((flags & O_CREAT) && __builtin_va_arg_pack_len() == 0) {
175 __creat_missing_mode(); /* Compile time error. */
176 }
177 }
178
179 if (__builtin_va_arg_pack_len() > 1) {
180 __creat_too_many_args(); /* Compile time error. */
181 }
182
183 if ((__builtin_va_arg_pack_len() == 0) && !__builtin_constant_p(flags)) {
184 return __open_2(pathname, flags);
185 }
186
187 return __open_real(pathname, flags, __builtin_va_arg_pack());
188 }
189
190 __BIONIC_FORTIFY_INLINE
openat(int dirfd,const char * pathname,int flags,...)191 int openat(int dirfd, const char* pathname, int flags, ...) {
192 if (__builtin_constant_p(flags)) {
193 if ((flags & O_CREAT) && __builtin_va_arg_pack_len() == 0) {
194 __creat_missing_mode(); /* Compile time error. */
195 }
196 }
197
198 if (__builtin_va_arg_pack_len() > 1) {
199 __creat_too_many_args(); /* Compile time error. */
200 }
201
202 if ((__builtin_va_arg_pack_len() == 0) && !__builtin_constant_p(flags)) {
203 return __openat_2(dirfd, pathname, flags);
204 }
205
206 return __openat_real(dirfd, pathname, flags, __builtin_va_arg_pack());
207 }
208 #endif /* __ANDROID_API__ >= __ANDROID_API_J_MR1__ */
209
210 #endif /* defined(__clang__) */
211
212 #undef __open_too_many_args_error
213 #undef __open_too_few_args_error
214 #endif /* defined(__BIONIC_FORTIFY) */
215
216 __END_DECLS
217
218 #endif /* _FCNTL_H */
219