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5a053ffe80
This commit renames lib/setup.h to lib/curl_setup.h and
renames lib/setup_once.h to lib/curl_setup_once.h.
Removes the need and usage of a header inclusion guard foreign
to libcurl. [1]
Removes the need and presence of an alarming notice we carried
in old setup_once.h [2]
----------------------------------------
1 - lib/setup_once.h used __SETUP_ONCE_H macro as header inclusion guard
up to commit ec691ca3 which changed this to HEADER_CURL_SETUP_ONCE_H,
this single inclusion guard is enough to ensure that inclusion of
lib/setup_once.h done from lib/setup.h is only done once.
Additionally lib/setup.h has always used __SETUP_ONCE_H macro to
protect inclusion of setup_once.h even after commit ec691ca3, this
was to avoid a circular header inclusion triggered when building a
c-ares enabled version with c-ares sources available which also has
a setup_once.h header. Commit ec691ca3 exposes the real nature of
__SETUP_ONCE_H usage in lib/setup.h, it is a header inclusion guard
foreign to libcurl belonging to c-ares's setup_once.h
The renaming this commit does, fixes the circular header inclusion,
and as such removes the need and usage of a header inclusion guard
foreign to libcurl. Macro __SETUP_ONCE_H no longer used in libcurl.
2 - Due to the circular interdependency of old lib/setup_once.h and the
c-ares setup_once.h header, old file lib/setup_once.h has carried
back from 2006 up to now days an alarming and prominent notice about
the need of keeping libcurl's and c-ares's setup_once.h in sync.
Given that this commit fixes the circular interdependency, the need
and presence of mentioned notice is removed.
All mentioned interdependencies come back from now old days when
the c-ares project lived inside a curl subdirectory. This commit
removes last traces of such fact.
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. It cannot have ENABLE_IPV6 defined at the same time, as c-ares
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has no ipv6 support. This can be Windows or *nix.
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CURLRES_THREADED - is defined if libcurl is built to run under (native)
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Windows, and then the name resolve will be done in a new thread, and the
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supported asynch API will be the same as for ares-builds.
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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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hostares.c - functions for ares-using name resolves
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hostthre.c - functions for threaded name resolves
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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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