The syslog-ng 3.0 Administrator Guide

The unix-stream() and unix-dgram() drivers send messages to a UNIX domain socket in either SOCK_STREAM or SOCK_DGRAM mode.

Both drivers have a single required argument specifying the name of the socket to connect to. For the list of available optional parameters, see Section 8.2.8, “unix-stream() & unix-dgram()”.

Declaration: 
                unix-stream(filename [options]);
                unix-dgram(filename [options]);

	Example 3.27. Using the unix-stream() driver
	destination d_unix_stream { unix-stream("/var/run/logs"); };