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) 53 54 extern void __creat_error() 55 __attribute__((__error__ ("called with O_CREAT, but missing mode"))); 56 extern void __too_many_args_error() 57 __attribute__((__error__ ("too many arguments"))); 58 extern int __open_real(const char *pathname, int flags, ...) 59 __asm__(__USER_LABEL_PREFIX__ "open"); 60 extern int __open_2(const char *, int); 61 62 __BIONIC_FORTIFY_INLINE 63 int open(const char *pathname, int flags, ...) { 64 if (__builtin_constant_p(flags)) { 65 if ((flags & O_CREAT) && __builtin_va_arg_pack_len() == 0) { 66 __creat_error(); // compile time error 67 } 68 } 69 70 if (__builtin_va_arg_pack_len() > 1) { 71 __too_many_args_error(); // compile time error 72 } 73 74 if ((__builtin_va_arg_pack_len() == 0) && !__builtin_constant_p(flags)) { 75 return __open_2(pathname, flags); 76 } 77 78 return __open_real(pathname, flags, __builtin_va_arg_pack()); 79 } 80 81 extern int __openat_2(int, const char *, int); 82 extern int __openat_real(int dirfd, const char *pathname, int flags, ...) 83 __asm__(__USER_LABEL_PREFIX__ "openat"); 84 85 __BIONIC_FORTIFY_INLINE 86 int openat(int dirfd, const char *pathname, int flags, ...) { 87 if (__builtin_constant_p(flags)) { 88 if ((flags & O_CREAT) && __builtin_va_arg_pack_len() == 0) { 89 __creat_error(); // compile time error 90 } 91 } 92 93 if (__builtin_va_arg_pack_len() > 1) { 94 __too_many_args_error(); // compile time error 95 } 96 97 if ((__builtin_va_arg_pack_len() == 0) && !__builtin_constant_p(flags)) { 98 return __openat_2(dirfd, pathname, flags); 99 } 100 101 return __openat_real(dirfd, pathname, flags, __builtin_va_arg_pack()); 102 } 103 104 #endif /* defined(__BIONIC_FORTIFY) */ 105 106 __END_DECLS 107 108 #endif /* _FCNTL_H */ 109
