ggzwrap − GGZ Gaming Zone game client wrapper
ggzwrap [OPTION...] −−exec=GAME
This wrapper takes the place of a game client, and relays the control messages between the game and the invoking instance, which is a GGZ core client. One task is to manage different file descriptors than the ones which are normally used. The GGZ clients do currently communicate using a socket which is passed in the environment variable GGZSOCKET, usually being fd 53 on the client side, so a call to:
ggzwrap −−fdin=$GGZSOCKET −−fdout=$GGZSOCKET −−exec=gameclient
would be equivalent to calling the client directly. However, there are games which communicate using the standard input/output facilities, so they need a redirection like:
ggzwrap −−fdin=0 −−fdout=1 −−exec=gameclient
The GGZ game Muehle uses ggzwrap to demonstrate that game clients do not necessarily need to use any GGZ libraries. The downside is that a lot of game client functionality will not be available. Game clients which want to make use of the wrapper must add a command similar to the one above into the file ggz.modules.
−−fdin=FD
File descriptor on which the game expects its input.
−−fdout=FD
File descriptor to which the game writes its output.
−−convert
This option automatically converts strings from network format to host format (more correctly, from libggz’s easysock format to the normal null-terminated one) for the game server, and back in the other direction. This will be needed for most games.
−−exec=GAME
The game client to launch as a child process.
GGZMODE
Set by a GGZ core client to tell games they’re running in GGZ mode.
GGZSOCKET
File descriptor for the connection to the invoking GGZ core client.
The GGZ Development Team <ggz−dev@mail.ggzgamingzone.org>
shadowbridge(6), ggz.modules(5), ggz(7)
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