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evdev not working for Wayland #200
Description
We are using evdev in a project, and while we tested Ubuntu 23, we notice that. UInput is not working at all when is running Wayland. using X11 works correctly
SO: Ubuntu 23.04
kernel: Linux ubuntu2304 6.2.0-35-generic
This is the image we are using https://www.linuxvmimages.com/images/ubuntu-2304/
Here's a sample script that we tried
from evdev import UInput, ecodes as e
import time
ui = UInput(name='uinput-sample', vendor=0x1, product=0x1, version=1)
# we tried this also
# ui = UInput()
time.sleep(2)
print("Simulating key press and release...")
ui.write(e.EV_KEY, e.KEY_A, 1)
ui.syn()
ui.write(e.EV_KEY, e.KEY_A, 0)
ui.syn()
time.sleep(2)
ui.close()
We also tested the following C script
#define _GNU_SOURCE
#include <fcntl.h>
#include <linux/uinput.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
// Initialize uinput device
int init_uinput_device() {
int fd = open("/dev/uinput", O_RDWR | O_NONBLOCK);
if (fd < 0) {
perror("open /dev/uinput");
return -1;
}
ioctl(fd, UI_SET_EVBIT, EV_KEY);
ioctl(fd, UI_SET_KEYBIT, KEY_A);
struct uinput_setup usetup;
memset(&usetup, 0, sizeof(usetup));
snprintf(usetup.name, UINPUT_MAX_NAME_SIZE, "uinput-sample");
usetup.id.bustype = BUS_USB;
usetup.id.vendor = 0x1;
usetup.id.product = 0x1;
usetup.id.version = 1;
if (ioctl(fd, UI_DEV_SETUP, &usetup)) {
perror("UI_DEV_SETUP");
return -1;
}
if (ioctl(fd, UI_DEV_CREATE)) {
perror("UI_DEV_CREATE");
return -1;
}
return fd;
}
// Emit events
void emit(int fd, int type, int code, int val) {
struct input_event ie;
ie.type = type;
ie.code = code;
ie.value = val;
ie.time.tv_sec = 0;
ie.time.tv_usec = 0;
write(fd, &ie, sizeof(ie));
}
int main() {
int fd = init_uinput_device();
if (fd < 0) {
fprintf(stderr, "Could not initialize uinput device.\n");
exit(EXIT_FAILURE);
}
sleep(2);
printf("Simulating key press and release...\n");
emit(fd, EV_KEY, KEY_A, 1);
emit(fd, EV_SYN, SYN_REPORT, 0);
emit(fd, EV_KEY, KEY_A, 0);
emit(fd, EV_SYN, SYN_REPORT, 0);
sleep(2);
ioctl(fd, UI_DEV_DESTROY);
close(fd);
return 0;
}
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