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main.go
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main.go
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package main
import (
"flag"
"log"
"syscall"
"github.com/sevlyar/go-daemon"
)
var (
daemonMode = flag.Bool("d", false, "run in daemon mode")
)
func main() {
flag.Parse()
context := &daemon.Context{
PidFileName: "pid",
PidFilePerm: 0644,
LogFileName: "log",
LogFilePerm: 0640,
WorkDir: "./",
Umask: 027,
}
if *daemonMode {
d, err := context.Search()
if d == nil || err != nil {
// no daemon process running, start it
child, err := context.Reborn()
if err != nil {
log.Fatalln(err)
}
if child != nil {
return
}
defer context.Release()
} else {
// check if the process is alive by sending signal 0
err := d.Signal(syscall.Signal(0))
if err == nil {
// the process is running, don't do anything
return
} else {
// no daemon process running, start it
child, err := context.Reborn()
if err != nil {
log.Fatalln(err)
}
if child != nil {
return
}
defer context.Release()
}
}
}
startIsmonitor(*daemonMode)
}
// func reloadHandler(sig os.Signal) error {
// log.Println("configuration reloaded")
// return nil
// }