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 17package commands 18 19import ( 20 gocontext "context" 21 "os" 22 "os/signal" 23 "syscall" 24 25 "github.com/containerd/containerd" 26 "github.com/containerd/containerd/errdefs" 27 "github.com/sirupsen/logrus" 28) 29 30type killer interface { 31 Kill(gocontext.Context, syscall.Signal, ...containerd.KillOpts) error 32} 33 34// ForwardAllSignals forwards signals 35func ForwardAllSignals(ctx gocontext.Context, task killer) chan os.Signal { 36 sigc := make(chan os.Signal, 128) 37 signal.Notify(sigc) 38 go func() { 39 for s := range sigc { 40 if canIgnoreSignal(s) { 41 logrus.Debugf("Ignoring signal %s", s) 42 continue 43 } 44 logrus.Debug("forwarding signal ", s) 45 if err := task.Kill(ctx, s.(syscall.Signal)); err != nil { 46 if errdefs.IsNotFound(err) { 47 logrus.WithError(err).Debugf("Not forwarding signal %s", s) 48 return 49 } 50 logrus.WithError(err).Errorf("forward signal %s", s) 51 } 52 } 53 }() 54 return sigc 55} 56 57// StopCatch stops and closes a channel 58func StopCatch(sigc chan os.Signal) { 59 signal.Stop(sigc) 60 close(sigc) 61} 62