| /* |
| * Copyright 2015 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 <gflags/gflags.h> |
| #include <glog/logging.h> |
| |
| #include <folly/File.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; |
| } |
