76 lines
1.9 KiB
Go
76 lines
1.9 KiB
Go
/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package commands
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import (
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gocontext "context"
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"fmt"
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"os"
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"os/signal"
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"strconv"
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"strings"
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"syscall"
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"github.com/containerd/containerd"
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"github.com/sirupsen/logrus"
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)
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type killer interface {
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Kill(gocontext.Context, syscall.Signal, ...containerd.KillOpts) error
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}
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// ForwardAllSignals forwards signals
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func ForwardAllSignals(ctx gocontext.Context, task killer) chan os.Signal {
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sigc := make(chan os.Signal, 128)
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signal.Notify(sigc)
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go func() {
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for s := range sigc {
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logrus.Debug("forwarding signal ", s)
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if err := task.Kill(ctx, s.(syscall.Signal)); err != nil {
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logrus.WithError(err).Errorf("forward signal %s", s)
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}
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}
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}()
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return sigc
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}
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// StopCatch stops and closes a channel
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func StopCatch(sigc chan os.Signal) {
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signal.Stop(sigc)
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close(sigc)
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}
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// ParseSignal parses a given string into a syscall.Signal
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// it checks that the signal exists in the platform-appropriate signalMap
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func ParseSignal(rawSignal string) (syscall.Signal, error) {
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s, err := strconv.Atoi(rawSignal)
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if err == nil {
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sig := syscall.Signal(s)
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for _, msig := range signalMap {
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if sig == msig {
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return sig, nil
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}
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}
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return -1, fmt.Errorf("unknown signal %q", rawSignal)
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}
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signal, ok := signalMap[strings.TrimPrefix(strings.ToUpper(rawSignal), "SIG")]
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if !ok {
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return -1, fmt.Errorf("unknown signal %q", rawSignal)
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}
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return signal, nil
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}
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