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During a reload operation, we used to send listener options associated with each passed file descriptor. These were passed as binary contents for the size of the "options" field in the struct listener. This means that any flag value change or field size change would be problematic, the former failing to properly grab certain options, the latter possibly causing permanent failures during this operation. Since these two previous commits: MINOR: reload: determine the foreing binding status from the socket BUG/MINOR: reload: detect the OS's v6only status before choosing an old socket we don't need this anymore as the values are determined from the file descriptor itself. Let's just turn the previous 32 bits to vestigal space, send them as zeroes and ignore them on receipt. The only possible side effect is if someone would want to roll back from a 2.3 to 2.2 or earlier, such options might be ignored during this reload. But other forthcoming changes might make this fail as well anyway so that's not a reason for keeping this behavior.
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 - BRANCHES to understand the project's life cycle and what version to use - 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)