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 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 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 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 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
