Why would xkb_x11_get_core_keyboard_device_id return -1? about libxkbcommon HOT 8 CLOSED

The code for the function is:

XKB_EXPORT int32_t
xkb_x11_get_core_keyboard_device_id(xcb_connection_t *conn)
{
    int32_t device_id;
    xcb_xkb_get_device_info_cookie_t cookie = xcb_xkb_get_device_info(conn, XCB_XKB_ID_USE_CORE_KBD, 0, 0, 0, 0, 0, 0);
    xcb_xkb_get_device_info_reply_t *reply = xcb_xkb_get_device_info_reply(conn, cookie, NULL);

    if (!reply)
        return -1;

    device_id = reply->deviceID;
    free(reply);
    return device_id;
}

To see why it fails, I suggest copy/pasting the the above into your own code, but also pass the third argument to xcb_xkb_get_device_info_reply (instead of NULL) to see what is the X11 error. You can do it like this:

xcb_generic_error_t *error;
reply = xcb_xkb_get_device_info_reply(conn, cookie, &error);
if (!reply) {
    printf("ERROR CODE: %d\n", error->error_code);
    return -1;
}

from libxkbcommon.

I suggest copy/pasting the the above into your own code

Well I'm actually using Golang, using it's built in C translation layer to interface with C functions from this library, so that's a little easier said then done.

but also pass the third argument to xcb_xkb_get_device_info_reply (instead of NULL) to see what is the X11 error. You can do it like this:

xcb_xkb_get_device_info_reply returns null. In the off chance you know Golang, here is my code...

xkbDevID := C.xkb_x11_get_core_keyboard_device_id(xcb)
if xkbDevID == -1 {
	var theError *C.xcb_generic_error_t
	var cookie C.xcb_xkb_get_device_info_cookie_t
	cookie = C.xcb_xkb_get_device_info(xcb, 256, 0, 0, 0, 0, 0, 0);
	reply := C.xcb_xkb_get_device_info_reply(xcb, cookie, &theError)
	if(reply != nil) {
		msg := int(theError.full_sequence)
		return errors.New(fmt.Sprintf("x11: xkb_x11_get_core_keyboard_device_id failed. %d",msg))
	} else {
		return errors.New("x11: xkb_x11_get_core_keyboard_device_id failed. so did xcb_xkb_get_device_info_reply.")
	}
}

...so what does it mean if both xkb_x11_get_core_keyboard_device_id and xcb_xkb_get_device_info_reply are null?

from libxkbcommon.

If reply is nil, then I think theError would be not nil. So if you change the if(reply != nil) to if(theError != nil), what is the value of msg?

from libxkbcommon.

theError is also nil.

from libxkbcommon.

just a random thought: DISPLAY is set correctly and you do have a connection to the X server?

from libxkbcommon.

Yep.

from libxkbcommon.

This is almost certainly not an xkbcommon problem, and we don't have any more ideas, so closing.

from libxkbcommon.

Yes, xkb on this linux install was broken. I forgot to respond with this, sorry.

from libxkbcommon.