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(__APPLE__) 23 24/* Mac OS has always had a 64-bit off_t, so it doesn't have off64_t. */ 25 26typedef off_t off64_t; 27 28static inline off64_t lseek64(int fd, off64_t offset, int whence) { 29 return lseek(fd, offset, whence); 30} 31 32static inline ssize_t pread64(int fd, void* buf, size_t nbytes, off64_t offset) { 33 return pread(fd, buf, nbytes, offset); 34} 35 36#endif /* __APPLE__ */ 37 38#if defined(_WIN32) 39#define O_CLOEXEC O_NOINHERIT 40#define O_NOFOLLOW 0 41#define DEFFILEMODE 0666 42#endif /* _WIN32 */ 43 44#if defined(_WIN32) 45#define ZD "%ld" 46#define ZD_TYPE long 47#else 48#define ZD "%zd" 49#define ZD_TYPE ssize_t 50#endif 51 52/* 53 * Needed for cases where something should be constexpr if possible, but not 54 * being constexpr is fine if in pre-C++11 code (such as a const static float 55 * member variable). 56 */ 57#if __cplusplus >= 201103L 58#define CONSTEXPR constexpr 59#else 60#define CONSTEXPR 61#endif 62 63/* 64 * TEMP_FAILURE_RETRY is defined by some, but not all, versions of 65 * <unistd.h>. (Alas, it is not as standard as we'd hoped!) So, if it's 66 * not already defined, then define it here. 67 */ 68#ifndef TEMP_FAILURE_RETRY 69/* Used to retry syscalls that can return EINTR. */ 70#define TEMP_FAILURE_RETRY(exp) ({ \ 71 typeof (exp) _rc; \ 72 do { \ 73 _rc = (exp); \ 74 } while (_rc == -1 && errno == EINTR); \ 75 _rc; }) 76#endif 77 78#endif /* __LIB_UTILS_COMPAT_H */ 79