Re: [libmicrohttpd] external event loop mode without using select?

[Christian Grothoff]

If your platform supports it, you should grab the epoll FD from
libmicrohttpd and only plug that single FD into your event loop,
effectively cascading the two event loops.

See MHD_DAEMON_INFO_EPOLL_FD for how to grab that FD.

On 2/8/22 11:49 PM, Greg Stark wrote:
> I have an existing event loop and other events I need to handle so I
> was planning to use external select mode. However I'm surprised that
> MHD_get_fdset is the only way to get the set of file descriptors.
> 
> It seems pointless to have MHD loop over its file descriptors
> constructing an fdset and then I have to loop over the fdset to pick
> out the file descriptors to add them to the event loop handler (which
> preferentially uses epoll, kqueue, or poll).
> 
> I'm not expecting a large pool of web connections, in fact I would
> rarely have more than one concurrent connection however there are a
> lot of file descriptors used elsewhere in the application so the
> maximum fd number might actually be large. fd_sets are a particularly
> impractical api for this.
>