Function pollAsync

Platforms/emscripten/web_example_pyrepl_jspi/src.mjs:151–156

(stream, timeout)

  },

  async pollAsync(stream, timeout) {
    if (!PTY.readable && timeout) {
      await waitForReadable(timeout);
    }
    return (PTY.readable ? POLLIN : 0) | (PTY.writable ? POLLOUT : 0);
  },
  ioctl(stream, request, varargs) {
    if (request === FIONREAD) {
      const res = PTY.fromLdiscToUpperBuffer.length;