File descriptor leak when Lwt_unix.shutdown fails

[francoisthire]

It may be possible that when the Dream server receives a connection and tries to shut it down, a file descriptor leak may occur. This happens if the function Lwt_unix.shutdown raises an exception (apparently this happens if the remote peer was already disconnected).

The culprit does not sound to be in dream directly but in dependencies used by dream. I create this issue for tracking this issue:

• Ensure shutdown function does not raise exception on ENOTCONN ocsigen/lwt_ssl#5 --> Address the issue for lwt_ssl
• Lwt-unix: Fix file descriptor leak with Lwt_unix.shutdown anmonteiro/gluten#81 --> Address the issue for gluten