github.com/kubewharf/katalyst-core@v0.5.3/pkg/util/process/signals.go (about)

     1  /*
     2  Copyright 2022 The Katalyst 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 process
    18  
    19  import (
    20  	"context"
    21  	"os"
    22  	"os/signal"
    23  	"syscall"
    24  )
    25  
    26  var onlyOneSignalHandler = make(chan struct{})
    27  
    28  // SetupSignalHandler registered for SIGTERM and SIGINT. A stop channel is returned
    29  // which is closed on one of these signals. If a second signal is caught, the program
    30  // is terminated with exit code 1.
    31  func SetupSignalHandler() context.Context {
    32  	close(onlyOneSignalHandler) // panics when called twice
    33  
    34  	ctx, cancel := context.WithCancel(context.TODO())
    35  	c := make(chan os.Signal, 2)
    36  	shutdownSignals := []os.Signal{os.Interrupt, syscall.SIGTERM}
    37  	signal.Notify(c, shutdownSignals...)
    38  
    39  	go func() {
    40  		<-c
    41  		cancel()
    42  		<-c
    43  		os.Exit(1) // second signal. Exit directly.
    44  	}()
    45  
    46  	return ctx
    47  }