Function ioctl

Platforms/emscripten/web_example_pyrepl_jspi/src.mjs:157–164

(stream, request, varargs)

    return (PTY.readable ? POLLIN : 0) | (PTY.writable ? POLLOUT : 0);
  },
  ioctl(stream, request, varargs) {
    if (request === FIONREAD) {
      const res = PTY.fromLdiscToUpperBuffer.length;
      Module.HEAPU32[varargs / 4] = res;
      return 0;
    }
    throw new Error("Unimplemented ioctl request");
  },
};

async function setupStdio(Module) {