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 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 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 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 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 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 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
