Restarting devtools QEMU leaves serial port busy

[kzurell]

• Restarting run-tkey-qemu using Ctrl-a x, then
• re-running the client app with --port set to ...devtools/tkey-qemu-pty

...causes tk.Connect() to fail with:

me@workstation:~/gowork$ ./src/one --port ~/tkey-devtools/tkey-qemu-pty 
No connection, Open /home/me/tkey-devtools/tkey-qemu-pty: Serial port busy

...so I have to Ctrl-a x Ctrl-c then reinvoke.

I'm using:

err = tk.Connect(devPath)
if err != nil {
	logger.Printf("No connection, %v\n", err)
	return
}
defer func() {
	tk.Close()
	logger.Printf("one: closing tkey...\n")
}()

...and I believe it's closing correctly the first time, still new to go.

Thanks for any help.

[mchack-work]

I'm unable to reproduce the errror you get. Not sure if it helps, but I used this program, inspired by yours:

package main

import (
	"fmt"
	"time"

	"github.com/tillitis/tkeyclient"
)

func connect(tk *tkeyclient.TillitisKey, devPath string) {
	fmt.Printf("Connecting to %v\n", devPath)
	err := tk.Connect(devPath)
	if err != nil {
		fmt.Printf("Failed to connect: %v\n", err)
		return
	}
	defer func() {
		tk.Close()
		fmt.Printf("Closing TKey connection\n")
	}()
}

func main() {
	tk := tkeyclient.New()
	devPath := "./tkey-qemu-pty"

	for {
		connect(tk, devPath)
		time.Sleep(1 * time.Second)
	}
}

Standing in the testconnect directory I ran:

 % ~/tillitis/git/tkey-devtools/run-tkey-qemu
unning TKey/QEMU container using image: ghcr.io/tillitis/tkey-qemu-tk1-23.03.1:latest
Let your TKey client app talk to it by passing: --port /home/mc/hacks/testconnect/tkey-qemu-pty
Stop QEMU by typing 'Ctrl-a' and then 'x'. It will then restart.

In another shell I started the testconnect program while simultaenously stopping qemu all the

Connecting to ./tkey-qemu-pty
Closing TKey connection
Connecting to ./tkey-qemu-pty
Closing TKey connection
Connecting to ./tkey-qemu-pty
Closing TKey connection

If I stop the qemu container completely (C-a x C-c) I get:

Connecting to ./tkey-qemu-pty
Failed to connect: Open ./tkey-qemu-pty: no such file or directory
Connecting to ./tkey-qemu-pty
Failed to connect: Open ./tkey-qemu-pty: no such file or directory