Specifying a Local Daemon
Specify the daemon’s client socket as a character string.
For local daemons, specify a TCP socket number; for example: "6555"
If you omit the daemon parameter of the transport creation function (in C, supply NULL), it uses 7500 as the default. Similarly, to start a daemon process using the default socket, omit the ‑listen option to the daemon command line.
In all cases, the communication type and socket number in the daemon parameter of the transport creation call must match those given to rvd through its -listen parameter.