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In multi-process, the TCP pause is very brittle and we never noticed it because the error was lost in the upper layers. The problem is that shutdown() may fail if another process already did it, and will cause a process to fail to pause. What we do here in case of error is that we double-check the socket's state to verify if it's still accepting connections, and if not, we can conclude that another process already did the job in parallel. The difficulty here is that we're trying to eliminate false positives where some OSes will silently report a success on shutdown() while they don't shut the socket down, hence this dance of shutw/listen/shutr that only keeps the compatible ones. Probably that a new approach relying on connect(AF_UNSPEC) would provide better results.
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)