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junction.go
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junction.go
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package sigmon
import (
"os"
"os/signal"
"sync"
"syscall"
)
// junction manages the connection and disconnection of os signal
// handling.
type junction struct {
sync.Mutex
isConnected bool
sighup chan os.Signal
sigint chan os.Signal
sigterm chan os.Signal
sigusr1 chan os.Signal
sigusr2 chan os.Signal
sigs chan Signal
done chan struct{}
}
func newJunction() *junction {
return &junction{
sighup: make(chan os.Signal, 1),
sigint: make(chan os.Signal, 1),
sigterm: make(chan os.Signal, 1),
sigusr1: make(chan os.Signal, 1),
sigusr2: make(chan os.Signal, 1),
sigs: make(chan Signal, 1),
done: make(chan struct{}, 1),
}
}
func (j *junction) connect() {
j.Lock()
defer j.Unlock()
if j.isConnected {
return
}
signal.Notify(j.sighup, syscall.SIGHUP)
signal.Notify(j.sigint, syscall.SIGINT)
signal.Notify(j.sigterm, syscall.SIGTERM)
notifyx(j.sigusr1, j.sigusr2) // split for unix/windows
go func() {
for {
select {
case <-j.done:
return
case <-j.sighup:
j.sigs <- SIGHUP
case <-j.sigint:
j.sigs <- SIGINT
case <-j.sigterm:
j.sigs <- SIGTERM
case <-j.sigusr1:
j.sigs <- SIGUSR1
case <-j.sigusr2:
j.sigs <- SIGUSR2
}
}
}()
j.isConnected = true
}
func (j *junction) disconnect() {
j.Lock()
defer j.Unlock()
if !j.isConnected {
return
}
j.done <- struct{}{}
j.isConnected = false
defer signal.Stop(j.sighup)
defer signal.Stop(j.sigint)
defer signal.Stop(j.sigterm)
defer signal.Stop(j.sigusr1)
defer signal.Stop(j.sigusr2)
}
func (j *junction) signals() chan Signal {
return j.sigs
}