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
lseek64(int fd,off64_t offset,int whence)28 static inline off64_t lseek64(int fd, off64_t offset, int whence) {
29 return lseek(fd, offset, whence);
30 }
31
pread64(int fd,void * buf,size_t nbytes,off64_t offset)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
pwrite64(int fd,const void * buf,size_t nbytes,off64_t offset)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
ftruncate64(int fd,off64_t length)40 static inline int ftruncate64(int fd, off64_t length) {
41 return ftruncate(fd, length);
42 }
43
44 #endif /* __APPLE__ */
45
46 #if defined(_WIN32)
47 #define O_CLOEXEC O_NOINHERIT
48 #define O_NOFOLLOW 0
49 #define DEFFILEMODE 0666
50 #endif /* _WIN32 */
51
52 #define ZD "%zd"
53 #define ZD_TYPE ssize_t
54
55 /*
56 * Needed for cases where something should be constexpr if possible, but not
57 * being constexpr is fine if in pre-C++11 code (such as a const static float
58 * member variable).
59 */
60 #if __cplusplus >= 201103L
61 #define CONSTEXPR constexpr
62 #else
63 #define CONSTEXPR
64 #endif
65
66 /*
67 * TEMP_FAILURE_RETRY is defined by some, but not all, versions of
68 * <unistd.h>. (Alas, it is not as standard as we'd hoped!) So, if it's
69 * not already defined, then define it here.
70 */
71 #ifndef TEMP_FAILURE_RETRY
72 /* Used to retry syscalls that can return EINTR. */
73 #define TEMP_FAILURE_RETRY(exp) ({ \
74 typeof (exp) _rc; \
75 do { \
76 _rc = (exp); \
77 } while (_rc == -1 && errno == EINTR); \
78 _rc; })
79 #endif
80
81 #if defined(_WIN32)
82 #define OS_PATH_SEPARATOR '\\'
83 #else
84 #define OS_PATH_SEPARATOR '/'
85 #endif
86
87 #endif /* __LIB_UTILS_COMPAT_H */
88