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