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signal.go
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signal.go
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// Copyright 2023 Google LLC
//
// 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 runtime
import (
"os"
"os/signal"
"sync"
"syscall"
)
var (
mu sync.Mutex
fns []func()
)
// OnExitSignal arranges to run fn() when a signal that might cause the
// process to exit is delivered.
func OnExitSignal(fn func()) {
mu.Lock()
defer mu.Unlock()
fns = append(fns, fn)
if len(fns) != 1 {
return
}
// Install handler on first call.
sig := make(chan os.Signal, 1)
signal.Notify(sig, syscall.SIGINT, syscall.SIGTERM)
go func() {
s := <-sig
mu.Lock()
defer mu.Unlock()
// Run cleanup functions in reverse order to match usual destruction order.
for i := len(fns) - 1; i >= 0; i-- {
fns[i]()
}
if num, ok := s.(syscall.Signal); ok {
os.Exit(128 + int(num))
}
os.Exit(1)
}()
}