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ctrlc.go
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ctrlc.go
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package ctrlc
import (
"fmt"
"os"
"os/signal"
"runtime"
"sync"
"syscall"
)
type Handle struct{ *boundSignal }
type boundSignal struct {
sig chan os.Signal
once sync.Once
}
// Signals returns any signals that could correspond to Ctrl+C.
func Signals() []os.Signal {
if runtime.GOOS == "windows" {
return []os.Signal{os.Interrupt}
}
return []os.Signal{os.Interrupt, syscall.SIGTERM}
}
// ClearHandlers removes all Ctrl+C signal handlers. Use with care.
func ClearHandlers() {
signal.Reset(Signals()...)
}
// Hook registers a function to be called when the user presses Ctrl+C.
// It returns a Handle, which must have its Done() method called to clean up.
// The event function will never be called more than once.
func Hook(event func()) Handle {
signalCh := make(chan os.Signal, 1)
signal.Notify(signalCh, Signals()...)
go func() {
sig := <-signalCh
if sig == nil {
return
}
if runtime.GOOS != "windows" {
// most terminals print ^C, this makes things easier to read.
fmt.Fprintf(os.Stderr, "\n")
}
event()
}()
return Handle{&boundSignal{sig: signalCh}}
}
// Done cleans up signal handlers.
func (h Handle) Done() {
h.once.Do(func() {
signal.Stop(h.sig)
close(h.sig)
})
}