net_interface

    Xmparvox and netparvox establishes two network sockets to communicate with each other. The first socket is used to pass commands and messages back and forth between the two. This is the port number you can optionally specify when starting netparvox and xmparvox. The second socket is used for image related data. The model works like this: netparvox initializes the first socket and waits for a connection from the GUI. Once the connection is established, netparvox looks for the next available port and opens it, then communicates the port number back to the GUI. The GUI then connects on the second port also. Once this is complete, netparvox would wait for a command via the first socket. When it receives a command, it would execute the necessary routines, send the rendered image, if any, to the GUI via the second socket, and go back to waiting for commands. The GUI installs an Xt work procedure that generates an event when image data arrive on the second socket. When images arrive, xmparvox will jump to the display routine in the event handler.

    The communication over the first socket is mostly one-way from the GUI to the renderer, except during initialization. The second socket is for the images from the renderer to the GUI.

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