| // Copyright 2016 The LUCI Authors. |
| // |
| // 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. |
| |
| package main |
| |
| import ( |
| "os" |
| "os/signal" |
| ) |
| |
| // catchInterrupt handles SIGINT and SIGTERM signals. |
| // |
| // When caught for the first time, it calls the `handler`, assuming it will |
| // gracefully shutdown the process. |
| // |
| // If called for the second time, it just kills the process right away. |
| func catchInterrupt(handler func()) { |
| sig := make(chan os.Signal, 1) |
| signal.Notify(sig, interruptSignals()...) |
| go func() { |
| stopCalled := false |
| for range sig { |
| if !stopCalled { |
| stopCalled = true |
| handler() |
| } else { |
| os.Exit(2) |
| } |
| } |
| }() |
| } |
