How to use epoll_ctl correctly?

when deleting a fd from the epoll event collection using epoll_ctl, is the fourth parameter event required?

for example, delete a writable event in ET mode,

    void Del(int fd) 
    {
        epoll_event ev;
        memset(&ev, 0, sizeof(ev));
        ev.data.fd = fd;                    //
        ev.events = EPOLLOUT | EPOLLET;     //
        epoll_ctl(epollFd, EPOLL_CTL_DEL, fd, &ev);
    }

there is still no need to dimension

Epoll

Dec.07,2021

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