What does dot before method name mean?

[Adam D. Ruppe]

On Saturday, 8 May 2021 at 01:45:49 UTC, Stephen Miller wrote:
> I am writing a tcp proxy server and I noticed that when a 
> socket is in non-blocking mode, it returns -1 if it doesn't 
> receive data, as opposed to 0.

It sets the `wouldHaveBlocked` flag in that case returning -1. 0 
always means connection closed.

> My questions are: What does the dot in front of recv mean? 
> Where is that code?

Leading dot means to look it up from top level instead of the 
local/class member. So then it uses the system function - recv 
from C - instead of the local ones.