#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <linux/input.h>
#include <sys/ioctl.h>
#include <limits.h>

int main() {

  int fd = open("/dev/input/event0", O_RDONLY|O_NONBLOCK);
  if (fd <= 0)
    return -1;

  printf("Device opened!\n");

  struct ff_effect effect = {0};
  effect.type = FF_RUMBLE;
  effect.id = -1;
  effect.replay.length = USHRT_MAX;
  effect.u.rumble.strong_magnitude = 65280;
  effect.u.rumble.weak_magnitude = 65280;
  if (ioctl(fd, EVIOCSFF, &effect) == -1)
    return -1;

  printf("Effect uploaded!\n");

  struct input_event event = {0};
  event.type = EV_FF;
  event.code = effect.id;
  write(fd, (const void*) &event, sizeof(event));

  printf("Effect written!\n");

  sleep(3);

  return 0;
}