mirror of https://github.com/moparisthebest/curl
36 lines
1.5 KiB
Plaintext
36 lines
1.5 KiB
Plaintext
hostip.c explained
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==================
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The main COMPILE-TIME DEFINES to keep in mind when reading the host*.c
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source file are these:
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CURLRES_IPV6 - this host has getaddrinfo() and family, and thus we use
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that. The host may not be able to resolve IPv6, but we don't really have to
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take that into account. Hosts that aren't IPv6-enabled have CURLRES_IPV4
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defined.
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CURLRES_ARES - is defined if libcurl is built to use c-ares for asynchronous
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name resolves. This can be Windows or *nix.
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CURLRES_THREADED - is defined if libcurl is built to use threading for
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asynchronous name resolves. The name resolve will be done in a new thread,
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and the supported asynch API will be the same as for ares-builds. This is
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the default under (native) Windows.
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If any of the two previous are defined, CURLRES_ASYNCH is defined too. If
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libcurl is not built to use an asynchronous resolver, CURLRES_SYNCH is
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defined.
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The host*.c sources files are split up like this:
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hostip.c - method-independent resolver functions and utility functions
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hostasyn.c - functions for asynchronous name resolves
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hostsyn.c - functions for synchronous name resolves
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asyn-ares.c - functions for asynchronous name resolves using c-ares
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asyn-thread.c - functions for asynchronous name resolves using threads
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hostip4.c - ipv4-specific functions
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hostip6.c - ipv6-specific functions
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The hostip.h is the single united header file for all this. It defines the
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CURLRES_* defines based on the config*.h and curl_setup.h defines.
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