static epoll_t* _cast_epoll(const oe_fd_t* epoll_)
{
    epoll_t* epoll = (epoll_t*)epoll_;

    if (epoll == NULL || epoll->magic != EPOLL_MAGIC)
        return NULL;

    return epoll;
}
static epoll_t* _cast_epoll(const oe_fd_t* epoll_)
{
    epoll_t* epoll = (epoll_t*)epoll_;

    if (epoll == NULL || epoll->magic != EPOLL_MAGIC)
        return NULL;

    return epoll;
}