mirror of
https://github.com/etcd-io/etcd.git
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7a1739a3e8
The go runtime won't always reinstall the default signal handler on the SIGTERM path, so it's possible the signal won't terminate the process. Instead, force SIG_DFL for the signal.
81 lines
2.2 KiB
Go
81 lines
2.2 KiB
Go
// Copyright 2015 The etcd Authors
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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// +build !windows,!plan9
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package osutil
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import (
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"os"
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"os/signal"
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"sync"
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"syscall"
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)
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// InterruptHandler is a function that is called on receiving a
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// SIGTERM or SIGINT signal.
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type InterruptHandler func()
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var (
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interruptRegisterMu, interruptExitMu sync.Mutex
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// interruptHandlers holds all registered InterruptHandlers in order
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// they will be executed.
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interruptHandlers = []InterruptHandler{}
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)
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// RegisterInterruptHandler registers a new InterruptHandler. Handlers registered
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// after interrupt handing was initiated will not be executed.
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func RegisterInterruptHandler(h InterruptHandler) {
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interruptRegisterMu.Lock()
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defer interruptRegisterMu.Unlock()
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interruptHandlers = append(interruptHandlers, h)
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}
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// HandleInterrupts calls the handler functions on receiving a SIGINT or SIGTERM.
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func HandleInterrupts() {
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notifier := make(chan os.Signal, 1)
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signal.Notify(notifier, syscall.SIGINT, syscall.SIGTERM)
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go func() {
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sig := <-notifier
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interruptRegisterMu.Lock()
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ihs := make([]InterruptHandler, len(interruptHandlers))
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copy(ihs, interruptHandlers)
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interruptRegisterMu.Unlock()
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interruptExitMu.Lock()
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plog.Noticef("received %v signal, shutting down...", sig)
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for _, h := range ihs {
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h()
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}
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signal.Stop(notifier)
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pid := syscall.Getpid()
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// exit directly if it is the "init" process, since the kernel will not help to kill pid 1.
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if pid == 1 {
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os.Exit(0)
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}
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setDflSignal(sig.(syscall.Signal))
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syscall.Kill(pid, sig.(syscall.Signal))
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}()
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}
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// Exit relays to os.Exit if no interrupt handlers are running, blocks otherwise.
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func Exit(code int) {
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interruptExitMu.Lock()
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os.Exit(code)
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}
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