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      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 
     26 typedef off_t off64_t;
     27 
     28 static inline off64_t lseek64(int fd, off64_t offset, int whence) {
     29     return lseek(fd, offset, whence);
     30 }
     31 
     32 static inline ssize_t pread64(int fd, void* buf, size_t nbytes, off64_t offset) {
     33     return pread(fd, buf, nbytes, offset);
     34 }
     35 
     36 static inline ssize_t pwrite64(int fd, const void* buf, size_t nbytes, off64_t offset) {
     37     return pwrite(fd, buf, nbytes, offset);
     38 }
     39 
     40 #endif /* __APPLE__ */
     41 
     42 #if defined(_WIN32)
     43 #define O_CLOEXEC O_NOINHERIT
     44 #define O_NOFOLLOW 0
     45 #define DEFFILEMODE 0666
     46 #endif /* _WIN32 */
     47 
     48 #if defined(_WIN32)
     49 #define ZD "%ld"
     50 #define ZD_TYPE long
     51 #else
     52 #define ZD "%zd"
     53 #define ZD_TYPE ssize_t
     54 #endif
     55 
     56 /*
     57  * Needed for cases where something should be constexpr if possible, but not
     58  * being constexpr is fine if in pre-C++11 code (such as a const static float
     59  * member variable).
     60  */
     61 #if __cplusplus >= 201103L
     62 #define CONSTEXPR constexpr
     63 #else
     64 #define CONSTEXPR
     65 #endif
     66 
     67 /*
     68  * TEMP_FAILURE_RETRY is defined by some, but not all, versions of
     69  * <unistd.h>. (Alas, it is not as standard as we'd hoped!) So, if it's
     70  * not already defined, then define it here.
     71  */
     72 #ifndef TEMP_FAILURE_RETRY
     73 /* Used to retry syscalls that can return EINTR. */
     74 #define TEMP_FAILURE_RETRY(exp) ({         \
     75     typeof (exp) _rc;                      \
     76     do {                                   \
     77         _rc = (exp);                       \
     78     } while (_rc == -1 && errno == EINTR); \
     79     _rc; })
     80 #endif
     81 
     82 #if defined(_WIN32)
     83 #define OS_PATH_SEPARATOR '\\'
     84 #else
     85 #define OS_PATH_SEPARATOR '/'
     86 #endif
     87 
     88 #endif /* __LIB_UTILS_COMPAT_H */
     89