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This patch splits recv and send functions in two layers. the lowest is responsible of DNS message transactions over the network. Doing this we could use DNS message layer for something else than resolving. Load balancing for instance. This patch also re-works the way to init a nameserver and introduce the new struct dns_dgram_server to prepare the arrival of dns_stream_server and the support of DNS over TCP. The way to retry a send failure of a request because of EAGAIN was re-worked. Previously there was no control and all "pending" queries were re-played each time it reaches a EAGAIN. This patch introduce a ring to stack messages in case of sent failure. This patch is emptied if poller shows that the socket is ready again to push messages.
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)