GDK での Windows Sockets の紹介

HRESULT
ApplyFragmentationSocketOptions(
    SOCKET s
)
{
    int value = 1;
    int error = setsockopt(s, IPPROTO_IP, IP_DONTFRAGMENT, (char *)&value, sizeof(value));
    if (error == SOCKET_ERROR)
    {
        return HRESULT_FROM_WIN32(WSAGetLastError());
    }

    value = 1384;
    error = setsockopt(s, IPPROTO_IP, IP_USER_MTU, (char *)&value, sizeof(value));
    if (error == SOCKET_ERROR)
    {
        return HRESULT_FROM_WIN32(WSAGetLastError());
    }

    return S_OK;
}