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signal.go
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signal.go
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// Copyright 2019 Google LLC
//
// 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
//
// http://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 futureevent
import (
"os"
"os/signal"
"time"
)
// OnSignal returns a new Event kicked on sig.
func OnSignal(sig os.Signal) Event {
c := make(chan time.Time, 1)
relay := make(chan os.Signal, 1)
go func() {
select {
case _, ok := <-relay:
if ok {
c <- time.Now()
}
}
}()
signal.Notify(relay, sig)
return &onSignal{c, relay}
}
type onSignal struct {
c chan time.Time
relay chan os.Signal
}
func (e *onSignal) Chan() <-chan time.Time {
return e.c
}
func (e *onSignal) Cancel() {
signal.Stop(e.relay)
drainOneSignal(e.relay)
close(e.relay)
drainOneTime(e.c)
close(e.c)
}