github.com/demonoid81/containerd@v1.3.4/cmd/ctr/commands/signals.go (about)

     1  /*
     2     Copyright The containerd Authors.
     3  
     4     Licensed under the Apache License, Version 2.0 (the "License");
     5     you may not use this file except in compliance with the License.
     6     You may obtain a copy of the License at
     7  
     8         http://www.apache.org/licenses/LICENSE-2.0
     9  
    10     Unless required by applicable law or agreed to in writing, software
    11     distributed under the License is distributed on an "AS IS" BASIS,
    12     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13     See the License for the specific language governing permissions and
    14     limitations under the License.
    15  */
    16  
    17  package commands
    18  
    19  import (
    20  	gocontext "context"
    21  	"os"
    22  	"os/signal"
    23  	"syscall"
    24  
    25  	"github.com/containerd/containerd"
    26  	"github.com/sirupsen/logrus"
    27  )
    28  
    29  type killer interface {
    30  	Kill(gocontext.Context, syscall.Signal, ...containerd.KillOpts) error
    31  }
    32  
    33  // ForwardAllSignals forwards signals
    34  func ForwardAllSignals(ctx gocontext.Context, task killer) chan os.Signal {
    35  	sigc := make(chan os.Signal, 128)
    36  	signal.Notify(sigc)
    37  	go func() {
    38  		for s := range sigc {
    39  			logrus.Debug("forwarding signal ", s)
    40  			if err := task.Kill(ctx, s.(syscall.Signal)); err != nil {
    41  				logrus.WithError(err).Errorf("forward signal %s", s)
    42  			}
    43  		}
    44  	}()
    45  	return sigc
    46  }
    47  
    48  // StopCatch stops and closes a channel
    49  func StopCatch(sigc chan os.Signal) {
    50  	signal.Stop(sigc)
    51  	close(sigc)
    52  }