Comment by olvy0

Here's how to emulate TCP_CORK using TCP_NODELAY, from [0]:

- unset the TCP_NODELAY flag on the socket

- Call send() zero or more times to add your outgoing data into the Nagle-queue

- set the TCP_NODELAY flag on the socket

- call send() with the number-of-bytes argument set to zero, to force an immediate send of the Nagle-queued data

[0] https://stackoverflow.com/a/22118709