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main_unix.go
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main_unix.go
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// +build linux darwin freebsd solaris
/*
Copyright The containerd Authors.
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 command
import (
"context"
"os"
"runtime"
"github.com/containerd/containerd/log"
"github.com/containerd/containerd/server"
"github.com/sirupsen/logrus"
"golang.org/x/sys/unix"
)
const defaultConfigPath = "/etc/containerd/config.toml"
var handledSignals = []os.Signal{
unix.SIGTERM,
unix.SIGINT,
unix.SIGUSR1,
unix.SIGPIPE,
}
func handleSignals(ctx context.Context, signals chan os.Signal, serverC chan *server.Server) chan struct{} {
done := make(chan struct{}, 1)
go func() {
var server *server.Server
for {
select {
case s := <-serverC:
server = s
case s := <-signals:
log.G(ctx).WithField("signal", s).Debug("received signal")
switch s {
case unix.SIGUSR1:
dumpStacks()
case unix.SIGPIPE:
continue
default:
if server == nil {
close(done)
return
}
server.Stop()
close(done)
}
}
}
}()
return done
}
func dumpStacks() {
var (
buf []byte
stackSize int
)
bufferLen := 16384
for stackSize == len(buf) {
buf = make([]byte, bufferLen)
stackSize = runtime.Stack(buf, true)
bufferLen *= 2
}
buf = buf[:stackSize]
logrus.Infof("=== BEGIN goroutine stack dump ===\n%s\n=== END goroutine stack dump ===", buf)
}