Re: [Libevent-users] event_add fails with ENOENT when on epoll

[Nick Mathewson <nickm@xxxxxxxxxxxxx>]

On Mon, Apr 19, 2010 at 11:24 PM, Denis Bilenko <denis.bilenko@xxxxxxxxx> wrote:
> Hi,
>
> I've run into an issue where event_add() fails with ENOENT.
> This happens when a socket reuses a descriptor that was recently
> closed and was used before with another event.
>
> The details are below. The question I have is - what are the ways to
> work around this?
>

You must never modify an event that is currently pending.  If you want
to reassign it, you need to call event_del(), then modify it, then
call event_add().

For some backends (like epoll and kqueue) you need to call event_del()
on the event when you close the socket, and then event_add() again,
even if the fd didn't change: as far as the kernel is concerned, it is
no longer interested in tracking fd, once the socket has closed.

-- 
Nick
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