69f8f566a2
It allows to keep main namespace cleaner Signed-off-by: Alexander Morozov <lk4d4@docker.com>
68 lines
1.4 KiB
Go
68 lines
1.4 KiB
Go
// +build linux
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package main
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import (
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"os"
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"os/signal"
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"syscall"
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"github.com/Sirupsen/logrus"
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"github.com/docker/containerd/supervisor"
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"github.com/docker/containerd/util"
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"github.com/opencontainers/runc/libcontainer/utils"
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)
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const signalBufferSize = 2048
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func startSignalHandler(supervisor *supervisor.Supervisor) {
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logrus.WithFields(logrus.Fields{
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"bufferSize": signalBufferSize,
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}).Debug("containerd: starting signal handler")
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signals := make(chan os.Signal, signalBufferSize)
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signal.Notify(signals)
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for s := range signals {
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switch s {
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case syscall.SIGTERM, syscall.SIGINT:
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supervisor.Stop(signals)
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case syscall.SIGCHLD:
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exits, err := reap()
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if err != nil {
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logrus.WithField("error", err).Error("containerd: reaping child processes")
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}
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for _, e := range exits {
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supervisor.SendEvent(e)
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}
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}
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}
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supervisor.Close()
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os.Exit(0)
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}
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func reap() (exits []*supervisor.Event, err error) {
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var (
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ws syscall.WaitStatus
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rus syscall.Rusage
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)
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for {
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pid, err := syscall.Wait4(-1, &ws, syscall.WNOHANG, &rus)
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if err != nil {
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if err == syscall.ECHILD {
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return exits, nil
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}
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return exits, err
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}
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if pid <= 0 {
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return exits, nil
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}
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e := supervisor.NewEvent(supervisor.ExitEventType)
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e.Pid = pid
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e.Status = utils.ExitStatus(ws)
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exits = append(exits, e)
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}
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}
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func setSubReaper() error {
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return util.SetSubreaper(1)
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}
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