[libmicrohttpd] How to close all upgraded connections when shutting down MHD_Daemon?

[Nicolas Mora]

Hello,

I'm currently working on an implementation of a websocket manager with 
MHD and it's getting pretty good so far.

The problem I have is when the daemon is shut down and there are open 
connections. The documentation on MHD_quiesce_daemon says that "Note 
that the caller is responsible for closing the returned socket;" which 
is close to what I have, but since a websocket can be left open 
indefinitely, I need to know if the daemon needs to stop.

Is there a signal or an event or any other way for the upgrade_handler 
function to know that a MHD_quiesce_daemon or a MHD_stop_daemon has been 
sent ?