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Source file src/sigs.k8s.io/controller-runtime/pkg/manager/signals/signal.go

Documentation: sigs.k8s.io/controller-runtime/pkg/manager/signals

     1  /*
     2  Copyright 2017 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package signals
    18  
    19  import (
    20  	"context"
    21  	"os"
    22  	"os/signal"
    23  )
    24  
    25  var onlyOneSignalHandler = make(chan struct{})
    26  
    27  // SetupSignalHandler registers for SIGTERM and SIGINT. A context is returned
    28  // which is canceled on one of these signals. If a second signal is caught, the program
    29  // is terminated with exit code 1.
    30  func SetupSignalHandler() context.Context {
    31  	close(onlyOneSignalHandler) // panics when called twice
    32  
    33  	ctx, cancel := context.WithCancel(context.Background())
    34  
    35  	c := make(chan os.Signal, 2)
    36  	signal.Notify(c, shutdownSignals...)
    37  	go func() {
    38  		<-c
    39  		cancel()
    40  		<-c
    41  		os.Exit(1) // second signal. Exit directly.
    42  	}()
    43  
    44  	return ctx
    45  }
    46  

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