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- /*
- * Copyright 2013-present Facebook, Inc.
- *
- * 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 <glog/logging.h>
- #include <folly/File.h>
- #include <folly/portability/GFlags.h>
- DEFINE_bool(s, false, "get shared lock");
- DEFINE_bool(x, false, "get exclusive lock");
- int main(int argc, char* argv[]) {
- gflags::ParseCommandLineFlags(&argc, &argv, true);
- google::InitGoogleLogging(argv[0]);
- CHECK_EQ(FLAGS_s + FLAGS_x, 1)
- << "exactly one of -s and -x must be specified";
- CHECK_EQ(argc, 2);
- folly::File f(argv[1], O_RDWR);
- bool r;
- if (FLAGS_s) {
- r = f.try_lock_shared();
- } else {
- r = f.try_lock();
- }
- return r ? 0 : 42;
- }
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