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 #define SPLICE_F_MOVE 1
60 #define SPLICE_F_NONBLOCK 2
61 #define SPLICE_F_MORE 4
62 #define SPLICE_F_GIFT 8
63
64 #define SYNC_FILE_RANGE_WAIT_BEFORE 1
65 #define SYNC_FILE_RANGE_WRITE 2
66 #define SYNC_FILE_RANGE_WAIT_AFTER 4
67
68 int creat(const char*, mode_t);
69 int creat64(const char*, mode_t) __INTRODUCED_IN(21);
70 int openat(int, const char*, int, ...) __overloadable
71 __RENAME_CLANG(openat);
72 int openat64(int, const char*, int, ...) __INTRODUCED_IN(21);
73 int open(const char*, int, ...) __overloadable __RENAME_CLANG(open);
74 int open64(const char*, int, ...) __INTRODUCED_IN(21);
75 ssize_t splice(int, off64_t*, int, off64_t*, size_t, unsigned int) __INTRODUCED_IN(21);
76 ssize_t tee(int, int, size_t, unsigned int) __INTRODUCED_IN(21);
77 ssize_t vmsplice(int, const struct iovec*, size_t, unsigned int) __INTRODUCED_IN(21);
78
79 #if defined(__USE_FILE_OFFSET64)
80 int fallocate(int, int, off_t, off_t) __RENAME(fallocate64) __INTRODUCED_IN(21);
81 int posix_fadvise(int, off_t, off_t, int) __RENAME(posix_fadvise64) __INTRODUCED_IN(21);
82 int posix_fallocate(int, off_t, off_t) __RENAME(posix_fallocate64) __INTRODUCED_IN(21);
83 #else
84 int fallocate(int, int, off_t, off_t) __INTRODUCED_IN(21);
85 int posix_fadvise(int, off_t, off_t, int) __INTRODUCED_IN(21);
86 int posix_fallocate(int, off_t, off_t) __INTRODUCED_IN(21);
87 #endif
88 int fallocate64(int, int, off64_t, off64_t) __INTRODUCED_IN(21);
89 int posix_fadvise64(int, off64_t, off64_t, int) __INTRODUCED_IN(21);
90 int posix_fallocate64(int, off64_t, off64_t) __INTRODUCED_IN(21);
91
92 #if defined(__USE_GNU)
93 ssize_t readahead(int, off64_t, size_t) __INTRODUCED_IN(16);
94 int sync_file_range(int, off64_t, off64_t, unsigned int) __INTRODUCED_IN(26);
95 #endif
96
97 int __open_2(const char*, int) __INTRODUCED_IN(17);
98 int __openat_2(int, const char*, int) __INTRODUCED_IN(17);
99 /*
100 * These are the easiest way to call the real open even in clang FORTIFY.
101 */
102 int __open_real(const char*, int, ...) __RENAME(open);
103 int __openat_real(int, const char*, int, ...) __RENAME(openat);
104
105
106 #if defined(__BIONIC_FORTIFY)
107 #define __open_too_many_args_error "too many arguments"
108 #define __open_too_few_args_error "called with O_CREAT, but missing mode"
109 #if defined(__clang__)
110
111 #if __ANDROID_API__ >= __ANDROID_API_J_MR1__
112 __BIONIC_ERROR_FUNCTION_VISIBILITY
113 int open(const char* pathname, int flags, mode_t modes, ...) __overloadable
114 __errorattr(__open_too_many_args_error);
115
116 __BIONIC_ERROR_FUNCTION_VISIBILITY
117 int open(const char* pathname, int flags) __overloadable
118 __enable_if(flags & O_CREAT, __open_too_few_args_error)
119 __errorattr(__open_too_few_args_error);
120
121 /*
122 * pass_object_size serves two purposes here, neither of which involve __bos: it
123 * disqualifies this function from having its address taken (so &open works),
124 * and it makes overload resolution prefer open(const char *, int) over
125 * open(const char *, int, ...).
126 */
127 __BIONIC_FORTIFY_INLINE
open(const char * const __pass_object_size pathname,int flags)128 int open(const char* const __pass_object_size pathname,
129 int flags) __overloadable {
130 return __open_2(pathname, flags);
131 }
132
133 __BIONIC_FORTIFY_INLINE
open(const char * const __pass_object_size pathname,int flags,mode_t modes)134 int open(const char* const __pass_object_size pathname, int flags, mode_t modes)
135 __overloadable {
136 return __open_real(pathname, flags, modes);
137 }
138
139 __BIONIC_ERROR_FUNCTION_VISIBILITY
140 int openat(int dirfd, const char* pathname, int flags) __overloadable
141 __enable_if(flags & O_CREAT, __open_too_few_args_error)
142 __errorattr(__open_too_few_args_error);
143
144 __BIONIC_ERROR_FUNCTION_VISIBILITY
145 int openat(int dirfd, const char* pathname, int flags, mode_t modes, ...)
146 __overloadable
147 __errorattr(__open_too_many_args_error);
148
149 __BIONIC_FORTIFY_INLINE
openat(int dirfd,const char * const __pass_object_size pathname,int flags)150 int openat(int dirfd, const char* const __pass_object_size pathname,
151 int flags) __overloadable {
152 return __openat_2(dirfd, pathname, flags);
153 }
154
155 __BIONIC_FORTIFY_INLINE
openat(int dirfd,const char * const __pass_object_size pathname,int flags,mode_t modes)156 int openat(int dirfd, const char* const __pass_object_size pathname, int flags,
157 mode_t modes) __overloadable {
158 return __openat_real(dirfd, pathname, flags, modes);
159 }
160 #endif /* __ANDROID_API__ >= __ANDROID_API_J_MR1__ */
161
162 #else /* defined(__clang__) */
163 __errordecl(__creat_missing_mode, __open_too_few_args_error);
164 __errordecl(__creat_too_many_args, __open_too_many_args_error);
165
166 #if __ANDROID_API__ >= __ANDROID_API_J_MR1__
167 __BIONIC_FORTIFY_INLINE
open(const char * pathname,int flags,...)168 int open(const char* pathname, int flags, ...) {
169 if (__builtin_constant_p(flags)) {
170 if ((flags & O_CREAT) && __builtin_va_arg_pack_len() == 0) {
171 __creat_missing_mode(); /* Compile time error. */
172 }
173 }
174
175 if (__builtin_va_arg_pack_len() > 1) {
176 __creat_too_many_args(); /* Compile time error. */
177 }
178
179 if ((__builtin_va_arg_pack_len() == 0) && !__builtin_constant_p(flags)) {
180 return __open_2(pathname, flags);
181 }
182
183 return __open_real(pathname, flags, __builtin_va_arg_pack());
184 }
185
186 __BIONIC_FORTIFY_INLINE
openat(int dirfd,const char * pathname,int flags,...)187 int openat(int dirfd, const char* pathname, int flags, ...) {
188 if (__builtin_constant_p(flags)) {
189 if ((flags & O_CREAT) && __builtin_va_arg_pack_len() == 0) {
190 __creat_missing_mode(); /* Compile time error. */
191 }
192 }
193
194 if (__builtin_va_arg_pack_len() > 1) {
195 __creat_too_many_args(); /* Compile time error. */
196 }
197
198 if ((__builtin_va_arg_pack_len() == 0) && !__builtin_constant_p(flags)) {
199 return __openat_2(dirfd, pathname, flags);
200 }
201
202 return __openat_real(dirfd, pathname, flags, __builtin_va_arg_pack());
203 }
204 #endif /* __ANDROID_API__ >= __ANDROID_API_J_MR1__ */
205
206 #endif /* defined(__clang__) */
207
208 #undef __open_too_many_args_error
209 #undef __open_too_few_args_error
210 #endif /* defined(__BIONIC_FORTIFY) */
211
212 __END_DECLS
213
214 #endif /* _FCNTL_H */
215