Is it necessary to remove all file descriptors in the interest list before closing the epoll instance itself?

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Provided that:

  • I have created an epoll instance epfd by epoll_create, and registered many regular file descriptors by EPOLL_CTL_ADD.
  • I want to close the epoll instance by close(epfd)

The manual page does't say whether I must EPOLL_CTL_DEL all file descriptors before close(epfd).

So, my question is:

Is it necessary to remove all file descriptors in the interest list before closing the epoll instance itself?

operating-system epoll asynchronous linux c
1 Answers

No, it's not necessary to manually remove them.

From the epoll_create(2) manpage (emphasis added)

When all file descriptors referring to an epoll instance have been closed, the kernel destroys the instance and releases the associated resources for reuse.

user_99521960
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