如何在epoll中赋值event.ptr？

Question

struct sockitem* NewSockItem(int sockfd, CallBack cb) {

    struct sockitem *si = (struct sockitem*)malloc(sizeof(struct sockitem));
    si->sockfd = sockfd;
    si->callback = cb;
    return si;
}

struct epoll_event ev;
ev.events = EPOLLIN | EPOLLET;
ev.events.ptr = NewSockItem(clientfd, recv_cb);

epoll_ctl(eventloop->epfd, EPOLL_CTL_ADD, clientfd, &ev);

在构建时，错误发生如下：

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Answer 1

使用ev.data.ptr而不是ev.events.ptr。