47 lines
1.3 KiB
C++
47 lines
1.3 KiB
C++
/*
|
|
* Copyright (c) Facebook, Inc. and its affiliates.
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <folly/portability/SysFile.h>
|
|
|
|
#ifdef _WIN32
|
|
#include <limits>
|
|
|
|
#include <folly/portability/Windows.h>
|
|
|
|
extern "C" int flock(int fd, int operation) {
|
|
HANDLE h = (HANDLE)_get_osfhandle(fd);
|
|
if (h == INVALID_HANDLE_VALUE) {
|
|
return -1;
|
|
}
|
|
|
|
constexpr DWORD kMaxDWORD = std::numeric_limits<DWORD>::max();
|
|
if (operation & LOCK_UN) {
|
|
if (!UnlockFile(h, 0, 0, kMaxDWORD, kMaxDWORD)) {
|
|
return -1;
|
|
}
|
|
} else {
|
|
DWORD flags = DWORD(
|
|
(operation & LOCK_NB ? LOCKFILE_FAIL_IMMEDIATELY : 0) |
|
|
(operation & LOCK_EX ? LOCKFILE_EXCLUSIVE_LOCK : 0));
|
|
OVERLAPPED ov = {};
|
|
if (!LockFileEx(h, flags, 0, kMaxDWORD, kMaxDWORD, &ov)) {
|
|
return -1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
#endif
|