| 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. |