After starting repeated return code is send

[ijskegel]

After starting spacefn-evdev return code is send repeatedly. This is on Debian 10.

I start the application with:
sudo ./spacefn /dev/input/......

And get the following output:
state 0
and after that a lot of empty lines (carriage returns) that keeps continuing.

After pressing the space bar once everything is fine.

If I start spacefn in the background and redirect all output to /dev/null the same happens.

BTW: Thanks for this amazing tool that makes using space-fn on a laptop keyboard possible!

[abrasive]

This happens because it grabs the input device, which stops the Return key-release code from being picked up by X11. I wonder, is the bug that the key-release is passed through by spacefn and ignored by X, or that the key-release is not passed through? Can you work it out?

[ijskegel]

Ok, that makes sense. I'm not very familiar with key presses and release in linux. Can you give me a hint on how I can work out what the actual problem is?

I've added a print statement to the read_one_key function:
fprintf(stdout, "type:%d, code:%d, value:%d\n", ev->type, ev->code, ev->value);
fflush(stdout);

Now it shows the following after starting spacefn:

state 0
type:4, code:4, value:28
type:1, code:28, value:0
type:0, code:0, value:0
<newline>
<newline>
<newline>
<newline>
...

If I hit the space bar then it shows:

type:4, code:4, value:57
type:1, code:57, value:1
state 1

[maciejmotyka]

I observe the same behavior on Ubuntu 19.10.

[hoanglongcao]

I also have it with Linux Mint. Somehow the input device sends Enter-press without Enter-release.

[TimApplepie]

I can confirm the issue on Ubuntu 20.04.