x.c

static ev_io watcher;

static void stdin_cb (EV_P_ ev_io *w, int revents) {
  puts("you can now read some data");
  ev_io_stop(&watcher);
}

int main() {
  ...

  ev_io_init(&watcher, read_cb, fd, EV_READ);
  ev_io_start(loop, &watcher);
  
  ev_run();
  return 0;
}


----

uv_tcp_t stream;
  
void on_data(uv_stream_t* stream, ssize_t nread, uv_buf_t buf) {
  puts("we received: ");
  write(1, buf.base, nread);
} 

int main() {
  uv_tcp_init(uv_default_loop(), &stream);
  ... 
  uv_read_start(&stream);
}