uinput problem

Hello everybody,

I'm trying to write a small userspace program to receive keys via rs232 and sent the corresponding key events.

Everything seems to work fine, except when I'm sending something like Aa oder aA where die keycode is the same. Then only AA or aa is recognized. I did't set the EV_REP bit because i don't need any auto-repeat features.

I'm sending the events via the following function.

void SysKeypress(int fd, int code, int down) {

	struct input_event ev;
	memset (&ev, 0, sizeof(ev));
	ev.type=EV_KEY; ev.code=code; ev.value=down;
	write (fd, &ev, sizeof(ev));
}

and if I hardcode an

	SysKeypress (uinput_fd, KEY_LEFTSHIFT, 1);
	SysKeypress (uinput_fd, KEY_1, 1);
	SysKeypress (uinput_fd, KEY_1, 0);
	SysKeypress (uinput_fd, KEY_LEFTSHIFT, 0);

	SysKeypress (uinput_fd, KEY_1, 1);
	SysKeypress (uinput_fd, KEY_1, 0);

it only receices an !! and if I change the blocks an 11.

I read the documentfile about input drivers, but i didn't find anything special about uinput.

I can't see what I'm doing wrong and hope someone might help me.

Regards
Tobias

Hi Tobias,

Are you working in the console or in X? What keyboard driver are you using? You may want to send EV_SYN/SYN_REPORT calls in between keypress events since consumers might rely on them.

Dmitry

Hi Dmitry!

In X. I tried it in the console and it seems to work. Problem occurs only within X.

In xorg.conf is
Driver "keyboard"
set.

I added a function

void SysSync(int fd) {
	struct input_event ev;
	memset (&ev, 0, sizeof(ev));
	ev.type=EV_SYN; ev.code=SYN_REPORT; ev.value=0;
	write (fd, &ev, sizeof(ev));
}

and then tried

	SysKeypress (uinput_fd, KEY_LEFTSHIFT, 1);
	SysSync(uinput_fd);
	SysKeypress (uinput_fd, KEY_1, 1);
	SysSync(uinput_fd);
	SysKeypress (uinput_fd, KEY_1, 0);
	SysSync(uinput_fd);
	SysKeypress (uinput_fd, KEY_LEFTSHIFT, 0);
	SysSync(uinput_fd);

	SysKeypress (uinput_fd, KEY_1, 1);
	SysSync(uinput_fd);
	SysKeypress (uinput_fd, KEY_1, 0);
	SysSync(uinput_fd);

but same behaviour within X.

Regards
Tobias

In this case I would recommend contacting X guys. You see that your uinput program works and the in-kernel consode driver works as well. Does xev reports the events you expect?

Dmitry