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