good resource for socket errors?

Question

Where can I find a list of all types of bsd style socket errors?

Answer 1

In the documentation? For instance, for connect(), see:

% man connect
...
  ECONNREFUSED
          No-one listening on the remote address.
  EISCONN
          The socket is already connected.

  ENETUNREACH
          Network is unreachable.

Answer 2

You can also find a list of error codes (and a general description of their meaning) on the Open Group's pages for each function (like connect, for example).