Unable to terminate the program by sending a TERM signal to the main process

[bourne-3]

Context: I am using the Gin framework and have made some customizations to the framework. Here are some of the encapsulated structures.

type sm struct {
	*gin.Engine
	Server     *http.Server
	RouterFunc func(*gin.Engine)
	Config     WbConf
	Ln net.Listener
}

After completing all the initialization, the service is started using the following code:

func (ss *simpleServer) ListenAndServe() {
	if ss.Ln != nil {
		if err := ss.Engine.RunListener(ss.Ln); err != nil {
			fmt.Println("current listen err:", err)
			if !strings.Contains(err.Error(), "use of closed network connection") {
				logrus.WithError(err).Panic("InitServerStart() Mainserver ListenAndServe failed")
			}
		}
		return
	}

	ss.Server.Handler = ss.Engine
	if err := ss.Server.ListenAndServe(); err != nil {
		fmt.Println("current listen err:", err)
		if err != http.ErrServerClosed {
			logrus.WithError(err).Panic("InitServerStart() Mainserver ListenAndServe failed")
		}
	}
}

When using "overseer," I assign state.Listener to ss.Ln and then call ss.Engine.RunListener(ss.Ln) to start the service.

Problem: Currently, graceful restart is working fine. However, when I send a TERM signal to the program for a normal shutdown, it gets blocked and doesn't terminate.

---

How can I resolve the above issues?

[bourne-3]

Update:

func (t *St) SH() {

	.... (some code)

	c := make(chan os.Signal, len(sigs))
	signal.Notify(c, sigs...)

	for {
		select {
		case sig := <-c:
			t.handle(sig)
		case <-t.ch:
			return
		}
	}
}

I found this function above in the code
When I commented out this function, it closed properly
... Why this happen..?

[bourne-3]

Also, I did an experiment and without any wrapping, with the default gin framework, when I call

kill -SIGUSR2 ${master_pid}

I get an error as follows

accept tcp [::]:5001: use of closed network connection

Is this error normal and do I need to deal with it?

======
Does this error report have the same effect as the http.ErrServerClosed ?

// ErrServerClosed is returned by the Server's Serve, ServeTLS, ListenAndServe,
// and ListenAndServeTLS methods after a call to Shutdown or Close.
var ErrServerClosed = errors.New("http: Server closed")