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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef __LIB_UTILS_COMPAT_H
#define __LIB_UTILS_COMPAT_H
#include <unistd.h>
#if !defined(__MINGW32__)
#include <sys/mman.h>
#endif
#if defined(__APPLE__)
/* Mac OS has always had a 64-bit off_t, so it doesn't have off64_t. */
static_assert(sizeof(off_t) >= 8, "This code requires that Mac OS have at least a 64-bit off_t.");
typedef off_t off64_t;
static inline void* mmap64(void* addr, size_t length, int prot, int flags, int fd, off64_t offset) {
return mmap(addr, length, prot, flags, fd, offset);
}
static inline off64_t lseek64(int fd, off64_t offset, int whence) {
return lseek(fd, offset, whence);
}
static inline ssize_t pread64(int fd, void* buf, size_t nbytes, off64_t offset) {
return pread(fd, buf, nbytes, offset);
}
static inline ssize_t pwrite64(int fd, const void* buf, size_t nbytes, off64_t offset) {
return pwrite(fd, buf, nbytes, offset);
}
static inline int ftruncate64(int fd, off64_t length) {
return ftruncate(fd, length);
}
#endif /* __APPLE__ */
#if defined(_WIN32)
#define O_CLOEXEC O_NOINHERIT
#define O_NOFOLLOW 0
#define DEFFILEMODE 0666
#endif /* _WIN32 */
#define ZD "%zd"
#define ZD_TYPE ssize_t
/*
* Needed for cases where something should be constexpr if possible, but not
* being constexpr is fine if in pre-C++11 code (such as a const static float
* member variable).
*/
#if __cplusplus >= 201103L
#define CONSTEXPR constexpr
#else
#define CONSTEXPR
#endif
/* TEMP_FAILURE_RETRY is not available on macOS, but still useful there. */
#ifndef TEMP_FAILURE_RETRY
/* Used to retry syscalls that can return EINTR. */
#define TEMP_FAILURE_RETRY(exp) \
({ \
__typeof__(exp) _rc; \
do { \
_rc = (exp); \
} while (_rc == -1 && errno == EINTR); \
_rc; \
})
#endif
#if defined(_WIN32)
#define OS_PATH_SEPARATOR '\\'
#else
#define OS_PATH_SEPARATOR '/'
#endif
#endif /* __LIB_UTILS_COMPAT_H */
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