int
main (int argc, char **argv) {
int rc;
int fd;
const char *path;
struct libevdev *dev;
struct measurements measurements = {0};
if (argc < 2)
return usage();
path = argv[1];
if (path[0] == '-')
return usage();
fd = open(path, O_RDONLY|O_NONBLOCK);
if (fd < 0) {
fprintf(stderr, "Error opening the device: %s\n", strerror(errno));
return 1;
}
rc = libevdev_new_from_fd(fd, &dev);
if (rc != 0) {
fprintf(stderr, "Error fetching the device info: %s\n", strerror(-rc));
return 1;
}
if (libevdev_grab(dev, LIBEVDEV_GRAB) != 0) {
fprintf(stderr, "Error: cannot grab the device, something else is grabbing it.\n");
fprintf(stderr, "Use 'fuser -v %s' to find processes with an open fd\n", path);
return 1;
}
libevdev_grab(dev, LIBEVDEV_UNGRAB);
printf("Mouse %s on %s\n", libevdev_get_name(dev), path);
printf("Move the device 250mm/10in or more along the x-axis.\n");
printf("Pause 3 seconds before movement to reset, Ctrl+C to exit.\n");
setbuf(stdout, NULL);
rc = mainloop(dev, &measurements);
printf("\n");
print_summary(&measurements);
printf("\n");
printf("Entry for hwdb match (replace XXX with the resolution in DPI):\n"
"mouse:%s:v%04xp%04x:name:%s:\n"
" MOUSE_DPI=XXX@%d\n",
bustype(libevdev_get_id_bustype(dev)),
libevdev_get_id_vendor(dev),
libevdev_get_id_product(dev),
libevdev_get_name(dev),
(int)measurements.max_frequency);
libevdev_free(dev);
close(fd);
return rc;
}
int main(int argc, char **argv)
{
struct libevdev *dev = NULL;
struct libevdev_uinput *uidev = NULL;
int fd, ret;
if (argc < 2){
fprintf(stderr, "Usage: %s <event device>\n", argv[0]);
return 1;
}
//open the event device file descriptor
fd = open(argv[1], O_RDONLY);
if (fd < 0) {perror("Failed to open device"); return fd;}
//create a libevdev device from the event file descriptor
ret = libevdev_new_from_fd(fd, &dev);
if (ret < 0) {perror("Failed to create libevdev device"); return ret;}
//create a device connected to the virtual device interface /dev/uinput
ret = libevdev_uinput_create_from_device(
dev,
LIBEVDEV_UINPUT_OPEN_MANAGED,
&uidev);
if (ret < 0) {perror("Failed to create uinput device"); return ret;}
sleep(1);
//EVIOCGRAB the event, this means no other client will receive the events from the device, including your window manager.
// "This is generally a bad idea. Don't do this." - libevdev documentation
//We need to do this to avoid douplicate keyboard events.
ret = libevdev_grab(dev, LIBEVDEV_GRAB);
//start the interceptor and never return
intercept(uidev, dev);
libevdev_uinput_destroy(uidev);
libevdev_grab(dev, LIBEVDEV_UNGRAB);
libevdev_free(dev);
return ret;
}
