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 /* Compatibility definitions for non-Linux (i.e., BSD-based) hosts. */ 23 #ifndef HAVE_OFF64_T 24 #if _FILE_OFFSET_BITS < 64 25 #error "_FILE_OFFSET_BITS < 64; large files are not supported on this platform" 26 #endif /* _FILE_OFFSET_BITS < 64 */ 27 28 typedef off_t off64_t; 29 30 static inline off64_t lseek64(int fd, off64_t offset, int whence) { 31 return lseek(fd, offset, whence); 32 } 33 34 #ifdef HAVE_PREAD 35 static inline ssize_t pread64(int fd, void* buf, size_t nbytes, off64_t offset) { 36 return pread(fd, buf, nbytes, offset); 37 } 38 #endif 39 40 #endif /* !HAVE_OFF64_T */ 41 42 #if HAVE_PRINTF_ZD 43 # define ZD "%zd" 44 # define ZD_TYPE ssize_t 45 #else 46 # define ZD "%ld" 47 # define ZD_TYPE long 48 #endif 49 50 /* 51 * TEMP_FAILURE_RETRY is defined by some, but not all, versions of 52 * <unistd.h>. (Alas, it is not as standard as we'd hoped!) So, if it's 53 * not already defined, then define it here. 54 */ 55 #ifndef TEMP_FAILURE_RETRY 56 /* Used to retry syscalls that can return EINTR. */ 57 #define TEMP_FAILURE_RETRY(exp) ({ \ 58 typeof (exp) _rc; \ 59 do { \ 60 _rc = (exp); \ 61 } while (_rc == -1 && errno == EINTR); \ 62 _rc; }) 63 #endif 64 65 #endif /* __LIB_UTILS_COMPAT_H */ 66
