1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef __LIB_UTILS_COMPAT_H 18 #define __LIB_UTILS_COMPAT_H 19 20 #include <unistd.h> 21 22 #if !defined(__MINGW32__) 23 #include <sys/mman.h> 24 #endif 25 26 #if defined(__APPLE__) 27 28 /* Mac OS has always had a 64-bit off_t, so it doesn't have off64_t. */ 29 static_assert(sizeof(off_t) >= 8, "This code requires that Mac OS have at least a 64-bit off_t."); 30 typedef off_t off64_t; 31 mmap64(void * addr,size_t length,int prot,int flags,int fd,off64_t offset)32 static inline void* mmap64(void* addr, size_t length, int prot, int flags, int fd, off64_t offset) { 33 return mmap(addr, length, prot, flags, fd, offset); 34 } 35 lseek64(int fd,off64_t offset,int whence)36 static inline off64_t lseek64(int fd, off64_t offset, int whence) { 37 return lseek(fd, offset, whence); 38 } 39 pread64(int fd,void * buf,size_t nbytes,off64_t offset)40 static inline ssize_t pread64(int fd, void* buf, size_t nbytes, off64_t offset) { 41 return pread(fd, buf, nbytes, offset); 42 } 43 pwrite64(int fd,const void * buf,size_t nbytes,off64_t offset)44 static inline ssize_t pwrite64(int fd, const void* buf, size_t nbytes, off64_t offset) { 45 return pwrite(fd, buf, nbytes, offset); 46 } 47 ftruncate64(int fd,off64_t length)48 static inline int ftruncate64(int fd, off64_t length) { 49 return ftruncate(fd, length); 50 } 51 52 #endif /* __APPLE__ */ 53 54 #if defined(_WIN32) 55 #define O_CLOEXEC O_NOINHERIT 56 #define O_NOFOLLOW 0 57 #define DEFFILEMODE 0666 58 #endif /* _WIN32 */ 59 60 #define ZD "%zd" 61 #define ZD_TYPE ssize_t 62 63 /* 64 * Needed for cases where something should be constexpr if possible, but not 65 * being constexpr is fine if in pre-C++11 code (such as a const static float 66 * member variable). 67 */ 68 #if __cplusplus >= 201103L 69 #define CONSTEXPR constexpr 70 #else 71 #define CONSTEXPR 72 #endif 73 74 /* 75 * TEMP_FAILURE_RETRY is defined by some, but not all, versions of 76 * <unistd.h>. (Alas, it is not as standard as we'd hoped!) So, if it's 77 * not already defined, then define it here. 78 */ 79 #ifndef TEMP_FAILURE_RETRY 80 /* Used to retry syscalls that can return EINTR. */ 81 #define TEMP_FAILURE_RETRY(exp) ({ \ 82 typeof (exp) _rc; \ 83 do { \ 84 _rc = (exp); \ 85 } while (_rc == -1 && errno == EINTR); \ 86 _rc; }) 87 #endif 88 89 #if defined(_WIN32) 90 #define OS_PATH_SEPARATOR '\\' 91 #else 92 #define OS_PATH_SEPARATOR '/' 93 #endif 94 95 #endif /* __LIB_UTILS_COMPAT_H */ 96