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Some structures have optional fields which depend on availability of certain features on certain platforms, and having to stuff lots of ifdefs in these structs makes them unreadable. Using real values like ints requires some initialization and adds even more confusion. Here we take a different approach : we create an empty type called empty_t to use as a substitute for the real type that is not implemented and which doesn't contain any value (it's an empty struct). Thus it has a size of zero but an address, thus a pointer may point to it. It will not have to be initialized though. Some initialization code might even continue to work and do nothing like initializing it using memset with its sizeof which is zero.
The HAProxy documentation has been split into a number of different files for ease of use. Please refer to the following files depending on what you're looking for : - INSTALL for instructions on how to build and install HAProxy - LICENSE for the project's license - CONTRIBUTING for the process to follow to submit contributions The more detailed documentation is located into the doc/ directory : - doc/intro.txt for a quick introduction on HAProxy - doc/configuration.txt for the configuration's reference manual - doc/lua.txt for the Lua's reference manual - doc/SPOE.txt for how to use the SPOE engine - doc/network-namespaces.txt for how to use network namespaces under Linux - doc/management.txt for the management guide - doc/regression-testing.txt for how to use the regression testing suite - doc/peers.txt for the peers protocol reference - doc/coding-style.txt for how to adopt HAProxy's coding style - doc/internals for developer-specific documentation (not all up to date)