Don't block on reads with an empty buffer

src/main.rs

@@ -27,10 +27,6 @@ impl file_rpc::Server for FileServ {
         _pos: u64,
         len: usize,
     ) -> std::result::Result<std::borrow::Cow<'_, [u8]>, ()> {
-        while KEYPRESS_BUF.lock().is_empty() {
-            ipc::process_messages();
-            process_keyboard_data();
-        }
         let mut encode_buf = [0u8; 4];
         let mut buf = vec![];
         let mut remaining_len = len;