blob: 3169fe7974055d38fe38f32e74b56f76ef96ba4d [file] [log] [blame]
// 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)
}
}
}()
}