Resolving host names
Aka
hostip.c explainedThe main compile-time defines to keep in mind when reading the
host*.c source file are these:this host has
getaddrinfo() and family, and thus we use that. The host may not be able to resolve IPv6, but we do not really have to take that into account. Hosts that are not IPv6-enabled have CURLRES_IPV4 defined.is defined if libcurl is built to use c-ares for asynchronous name resolves. This can be Windows or *nix.
is defined if libcurl is built to use threading for asynchronous name resolves. The name resolve will be done in a new thread, and the supported asynch API will be the same as for ares-builds. This is the default under (native) Windows.
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 functionshostasyn.c- functions for asynchronous name resolveshostsyn.c- functions for synchronous name resolvesasyn-ares.c- functions for asynchronous name resolves using c-aresasyn-thread.c- functions for asynchronous name resolves using threadshostip4.c- IPv4 specific functionshostip6.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 curl_setup.h defines.Last modified 1yr ago