68 lines
1.2 KiB
Go
68 lines
1.2 KiB
Go
package daemon
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import (
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"flag"
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"log"
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"os"
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"syscall"
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"time"
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)
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func Example() {
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signal := flag.String("s", "", "send signal to daemon")
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handler := func(sig os.Signal) error {
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log.Println("signal:", sig)
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if sig == syscall.SIGTERM {
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return ErrStop
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}
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return nil
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}
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// Define command: command-line arg, system signal and handler
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AddCommand(StringFlag(signal, "term"), syscall.SIGTERM, handler)
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AddCommand(StringFlag(signal, "reload"), syscall.SIGHUP, handler)
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flag.Parse()
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// Define daemon context
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dmn := &Context{
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PidFileName: "/var/run/daemon.pid",
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PidFilePerm: 0644,
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LogFileName: "/var/log/daemon.log",
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LogFilePerm: 0640,
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WorkDir: "/",
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Umask: 027,
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}
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// Send commands if needed
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if len(ActiveFlags()) > 0 {
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d, err := dmn.Search()
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if err != nil {
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log.Fatalln("Unable send signal to the daemon:", err)
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}
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SendCommands(d)
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return
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}
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// Process daemon operations - send signal if present flag or daemonize
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child, err := dmn.Reborn()
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if err != nil {
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log.Fatalln(err)
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}
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if child != nil {
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return
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}
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defer dmn.Release()
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// Run main operation
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go func() {
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for {
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time.Sleep(0)
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}
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}()
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err = ServeSignals()
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if err != nil {
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log.Println("Error:", err)
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}
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}
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