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 #ifndef _FCNTL_H 29 #define _FCNTL_H 30 31 #include <sys/cdefs.h> 32 #include <sys/types.h> 33 #include <linux/fcntl.h> 34 #include <unistd.h> /* this is not required, but makes client code much happier */ 35 36 __BEGIN_DECLS 37 38 #ifndef O_ASYNC 39 #define O_ASYNC FASYNC 40 #endif 41 42 #ifndef O_CLOEXEC 43 #define O_CLOEXEC 02000000 44 #endif 45 46 extern int open(const char* path, int mode, ...); 47 extern int openat(int fd, const char* path, int mode, ...); 48 extern int unlinkat(int dirfd, const char *pathname, int flags); 49 extern int fcntl(int fd, int command, ...); 50 extern int creat(const char* path, mode_t mode); 51 52 #if defined(__BIONIC_FORTIFY) && !defined(__clang__) 53 __errordecl(__creat_missing_mode, "called with O_CREAT, but missing mode"); 54 __errordecl(__creat_too_many_args, "too many arguments"); 55 extern int __open_real(const char *pathname, int flags, ...) 56 __asm__(__USER_LABEL_PREFIX__ "open"); 57 extern int __open_2(const char *, int); 58 59 __BIONIC_FORTIFY_INLINE 60 int open(const char *pathname, int flags, ...) { 61 if (__builtin_constant_p(flags)) { 62 if ((flags & O_CREAT) && __builtin_va_arg_pack_len() == 0) { 63 __creat_missing_mode(); // compile time error 64 } 65 } 66 67 if (__builtin_va_arg_pack_len() > 1) { 68 __creat_too_many_args(); // compile time error 69 } 70 71 if ((__builtin_va_arg_pack_len() == 0) && !__builtin_constant_p(flags)) { 72 return __open_2(pathname, flags); 73 } 74 75 return __open_real(pathname, flags, __builtin_va_arg_pack()); 76 } 77 78 extern int __openat_2(int, const char *, int); 79 extern int __openat_real(int dirfd, const char *pathname, int flags, ...) 80 __asm__(__USER_LABEL_PREFIX__ "openat"); 81 82 __BIONIC_FORTIFY_INLINE 83 int openat(int dirfd, const char *pathname, int flags, ...) { 84 if (__builtin_constant_p(flags)) { 85 if ((flags & O_CREAT) && __builtin_va_arg_pack_len() == 0) { 86 __creat_missing_mode(); // compile time error 87 } 88 } 89 90 if (__builtin_va_arg_pack_len() > 1) { 91 __creat_too_many_args(); // compile time error 92 } 93 94 if ((__builtin_va_arg_pack_len() == 0) && !__builtin_constant_p(flags)) { 95 return __openat_2(dirfd, pathname, flags); 96 } 97 98 return __openat_real(dirfd, pathname, flags, __builtin_va_arg_pack()); 99 } 100 101 #endif /* defined(__BIONIC_FORTIFY) && !defined(__clang__) */ 102 103 __END_DECLS 104 105 #endif /* _FCNTL_H */ 106
