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- hostip.c explained
- ==================
- The main COMPILE-TIME DEFINES to keep in mind when reading the host*.c
- source file are these:
- CURLRES_IPV6 - this host has getaddrinfo() and family, and thus we use
- that. The host may not be able to resolve IPv6, but we don't really have to
- take that into account. Hosts that aren't IPv6-enabled have CURLRES_IPV4
- defined.
- CURLRES_ARES - is defined if libcurl is built to use c-ares for asynchronous
- name resolves. It cannot have ENABLE_IPV6 defined at the same time, as c-ares
- has no ipv6 support. This can be Windows or *nix.
- CURLRES_THREADED - is defined if libcurl is built to run under (native)
- Windows, and then the name resolve will be done in a new thread, and the
- supported asynch API will be the same as for ares-builds.
- If any of the two previous are defined, CURLRES_ASYNCH is defined too. If
- libcurl is not built to use an asynchronous resolver, CURLRES_SYNCH is
- defined.
- The host*.c sources files are split up like this:
- hostip.c - method-independent resolver functions and utility functions
- hostasyn.c - functions for asynchronous name resolves
- hostsyn.c - functions for synchronous name resolves
- hostares.c - functions for ares-using name resolves
- hostthre.c - functions for threaded name resolves
- hostip4.c - ipv4-specific functions
- hostip6.c - ipv6-specific functions
- The hostip.h is the single united header file for all this. It defines the
- CURLRES_* defines based on the config*.h and setup.h defines.
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