60 lines
1.5 KiB
Go
60 lines
1.5 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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package server
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import (
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"os"
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"os/signal"
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)
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var onlyOneSignalHandler = make(chan struct{})
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var shutdownHandler chan os.Signal
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// SetupSignalHandler registered for SIGTERM and SIGINT. A stop channel is returned
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// which is closed on one of these signals. If a second signal is caught, the program
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// is terminated with exit code 1.
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func SetupSignalHandler() <-chan struct{} {
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close(onlyOneSignalHandler) // panics when called twice
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shutdownHandler = make(chan os.Signal, 2)
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stop := make(chan struct{})
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signal.Notify(shutdownHandler, shutdownSignals...)
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go func() {
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<-shutdownHandler
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close(stop)
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<-shutdownHandler
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os.Exit(1) // second signal. Exit directly.
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}()
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return stop
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}
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// RequestShutdown emulates a received event that is considered as shutdown signal (SIGTERM/SIGINT)
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// This returns whether a handler was notified
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func RequestShutdown() bool {
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if shutdownHandler != nil {
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select {
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case shutdownHandler <- shutdownSignals[0]:
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return true
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default:
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}
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}
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return false
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}
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