ZeroMQ OS native socket access and pipe capacity adjustment

[IFOneDev]

Hello there:

As far as I know, there is no way to access underlying native socket FD of router socket for example.
Consider 1000 peers connected to a router socket. Is there any way to access the peers FD through
router when connection accepted? The reason for such feature is for integrating into event loops for
read/write events through a pool of fibers in a thread, for instance.

Nevertheless, is it possible to adjust a ZeroMQ underlying pipe to zero? if yes, then the read/write
operation should directly goes through networking protocol stack buffers. Right?

Thank you for your kind attention, quick reply and support.
Regards,