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When using listener socket, source address for emission is explicitely set using ancillary data for sendmsg(). This is useful to guarantee the correct address is used when binding on a non-explicit address. This code was implemented directly under qc_snd_buf(). However, it is quite complex due to portability issue. For IPv4, two parallel implementations coexist, defined under IP_PKTINFO or IP_RECVDSTADDR. For IPv6, another option is defined under IPV6_RECVPKTINFO. Each variant uses its distinct name which increase the code complexity. Extract ancillary data filling in a dedicated function named cmsg_set_saddr(). This reduces greatly the body of qc_snd_buf(). Such functions can be replicated when other ancillary data type will be implemented. This will notably be useful for GSO implementation.
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)