Why does epoll show Bad file descriptor?

Why does epoll show Bad file descriptor?

Why does epoll show Bad file descriptor?

Wrong order:

Close ();

Epoll_ctl (epollfd, EPOLL_CTL_DEL, sockfd, & ev );

Correct order:

Epoll_ctl (epollfd, EPOLL_CTL_DEL, sockfd, & ev );

Close ();

When you call close () to disable socket descriptor before deleting the event epoll_ctl (epollfd, epollfd, EPOLL_CTL_DEL, sockfd, & ev);, the epoll_ctl () returned value is less than 0 when the event is deleted, the system prompts Bad file descriptor. After the event is deleted, you can call close () to close the corresponding socket Descriptor and no error will be reported.

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