Epoll Why bad file descriptor is present

Epoll Why bad file descriptor is present

Order of Errors:

Close ();

Epoll_ctl (EPOLLFD, Epoll_ctl_del, SOCKFD, &ev);

The correct order:

Epoll_ctl (EPOLLFD, Epoll_ctl_del, SOCKFD, &ev);

Close ();

Deleting the event Epoll_ctl (EPOLLFD, Epoll_ctl_del, SOCKFD, &ev) before calling Close () closes the socket descriptor, which results in a delete event when the Epoll_ctl () return value is less than 0 and prompts bad File descriptor. After the event is deleted, calling close () closes the corresponding socket descriptor without an error.

Epoll Why bad file descriptor is present