47 lines
1.3 KiB
C++
47 lines
1.3 KiB
C++
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/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <folly/portability/SysFile.h>
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#ifdef _WIN32
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#include <limits>
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#include <folly/portability/Windows.h>
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extern "C" int flock(int fd, int operation) {
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HANDLE h = (HANDLE)_get_osfhandle(fd);
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if (h == INVALID_HANDLE_VALUE) {
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return -1;
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}
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constexpr DWORD kMaxDWORD = std::numeric_limits<DWORD>::max();
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if (operation & LOCK_UN) {
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if (!UnlockFile(h, 0, 0, kMaxDWORD, kMaxDWORD)) {
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return -1;
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}
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} else {
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DWORD flags = DWORD(
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(operation & LOCK_NB ? LOCKFILE_FAIL_IMMEDIATELY : 0) |
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(operation & LOCK_EX ? LOCKFILE_EXCLUSIVE_LOCK : 0));
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OVERLAPPED ov = {};
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if (!LockFileEx(h, flags, 0, kMaxDWORD, kMaxDWORD, &ov)) {
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return -1;
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}
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}
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return 0;
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}
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#endif
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