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// Copyright 2021 The gVisor 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
//
// https://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 shim
import (
"os"
"os/signal"
"runtime"
"sync"
"syscall"
"github.com/containerd/containerd/log"
)
var once sync.Once
func setDebugSigHandler() {
once.Do(func() {
dumpCh := make(chan os.Signal, 1)
signal.Notify(dumpCh, syscall.SIGUSR2)
go func() {
buf := make([]byte, 10240)
for range dumpCh {
for {
n := runtime.Stack(buf, true)
if n >= len(buf) {
buf = make([]byte, 2*len(buf))
continue
}
log.L.Debugf("User requested stack trace:\n%s", buf[:n])
}
}
}()
log.L.Debugf("For full process dump run: kill -%d %d", syscall.SIGUSR2, os.Getpid())
})
}
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