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signal-handling.go
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signal-handling.go
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package main
import (
"flag"
"github.com/sevlyar/go-daemon"
"log"
"os"
"syscall"
"time"
)
var (
signal = flag.String("s", "", `Send signal to the daemon:
quit — graceful shutdown
stop — fast shutdown
reload — reloading the configuration file`)
)
func main() {
flag.Parse()
daemon.AddCommand(daemon.StringFlag(signal, "quit"), syscall.SIGQUIT, termHandler)
daemon.AddCommand(daemon.StringFlag(signal, "stop"), syscall.SIGTERM, termHandler)
daemon.AddCommand(daemon.StringFlag(signal, "reload"), syscall.SIGHUP, reloadHandler)
cntxt := &daemon.Context{
PidFileName: "sample.pid",
PidFilePerm: 0644,
LogFileName: "sample.log",
LogFilePerm: 0640,
WorkDir: "./",
Umask: 027,
Args: []string{"[go-daemon sample]"},
}
if len(daemon.ActiveFlags()) > 0 {
d, err := cntxt.Search()
if err != nil {
log.Fatalf("Unable send signal to the daemon: %s", err.Error())
}
daemon.SendCommands(d)
return
}
d, err := cntxt.Reborn()
if err != nil {
log.Fatalln(err)
}
if d != nil {
return
}
defer cntxt.Release()
log.Println("- - - - - - - - - - - - - - -")
log.Println("daemon started")
go worker()
err = daemon.ServeSignals()
if err != nil {
log.Printf("Error: %s", err.Error())
}
log.Println("daemon terminated")
}
var (
stop = make(chan struct{})
done = make(chan struct{})
)
func worker() {
LOOP:
for {
time.Sleep(time.Second) // this is work to be done by worker.
select {
case <-stop:
break LOOP
default:
}
}
done <- struct{}{}
}
func termHandler(sig os.Signal) error {
log.Println("terminating...")
stop <- struct{}{}
if sig == syscall.SIGQUIT {
<-done
}
return daemon.ErrStop
}
func reloadHandler(sig os.Signal) error {
log.Println("configuration reloaded")
return nil
}