Panics on Bash on Windows

[lllama]

Running the keyboard demo fails with a panic. It's on line 47 of api.go

	_, err = fcntl(in, syscall.F_SETOWN, syscall.Getpid())
	if runtime.GOOS != "darwin" && err != nil {
		return err
	}

and the error is ultimately returned from fcntl in termbox.go:

func fcntl(fd int, cmd int, arg int) (val int, err error) {
	r, _, e := syscall.Syscall(syscall.SYS_FCNTL, uintptr(fd), uintptr(cmd),
		uintptr(arg))
	val = int(r)
	if e != 0 {
		err = e
	}
	return
}

Looks like someone else has had a similar issue: https://stackoverflow.com/questions/45911874/termbox-library-can-not-be-initialized-at-termbox-go

I won't pretend to know anything about syscalls but let me know if I can provide any more information.

[lllama]

Quick update - commenting out the runtime.GOOS check allows the demos to run. By 'run' I mean that the initial interface is displayed but it cannot be interacted with. The process needs killing from another terminal.

[lllama]

Looks like this might be addressed in Insider builds of Windows: microsoft/WSL#601

[nsf]

Also termbox-go works natively on windows (via windows console backend). Sure you might prefer it to run via bash for whatever reason. But I never tested it this way.

[therealplato]

+1, spent a couple hours trying to diagnose and solve this last night, running inside Linux Subsystem for Windows. I also don't know anything about syscalls so my plan is to try rewriting the project with termui :(

[swtch1]

I don't think mine is different enough to create a new issue. Just going to drop this here:

$ go get -u github.com/nsf/termbox-go
$ go run ~/go/src/github.com/nsf/termbox-go/_demos/keyboard.go
panic: invalid argument

goroutine 1 [running]:
panic(0x5469e0, 0xc82000a738)
        /usr/lib/go-1.6/src/runtime/panic.go:481 +0x3e6
main.main()
        /home/j/go/src/github.com/nsf/termbox-go/_demos/keyboard.go:663 +0x88
exit status 2

Windows BASH
Ubuntu 16.04.5 LTS

[xxxserxxx]

@therealplato

my plan is to try rewriting the project with termui :(

Did you eventually discover that termui is built on termbox-go? Did you find a different approach?

[scrouthtv]

I don't know if anyone is still interested in this, but just in case:
I tried running the keyboard test (and some other tests) in WSL2 zsh under Windows 10 Version 2004.
It fully worked for me both in the traditional conemu terminal as well as in the new Terminal emulator.

Let me know if your issue persists and we'll look into it!