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 }