stdio.h, stdlib.h, string.h, stdarg.h and ctype.h inclusion done in setup_once.h

async resolvers: further cleanups

asyn-ares.c and asyn-thread.c are two separate backends that implement
the same (internal) async resolver API for libcurl to use. Backend is
specifi

async resolvers: further cleanups

asyn-ares.c and asyn-thread.c are two separate backends that implement
the same (internal) async resolver API for libcurl to use. Backend is
specified at build time.

The internal resolver API is defined in asyn.h for asynch resolvers.

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asynch resolvers: unified

Introducing an internal API for handling of different async resolver
backends.

ares: memory leak fix

The double name resolve trick used with c-ares could leave allocated
memory in 'temp_ai' if the operation was aborted in the middle.

c-ares: fix cancelled resolves

When built IPv6-enabled, we could do Curl_done() with one of the two
resolves having returned already, so when ares_cancel() is called the
resolve call

c-ares: fix cancelled resolves

When built IPv6-enabled, we could do Curl_done() with one of the two
resolves having returned already, so when ares_cancel() is called the
resolve callback ends up doing funny things (sometimes resulting in a
segfault) since it would try to actually store the previous resolve even
though we're shutting down the resolve.

This bug was introduced in commit 8ab137b2bc9630ce so it hasn't been
included in any public release.

Bug: http://curl.haxx.se/bug/view.cgi?id=3145445
Reported by: Pedro Larroy

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ares: ask for both IPv4 and IPv6 addresses

Make the c-ares resolver code ask for both IPv4 and IPv6 addresses when
IPv6 is enabled.

This is a workaround for the missing ares_get

ares: ask for both IPv4 and IPv6 addresses

Make the c-ares resolver code ask for both IPv4 and IPv6 addresses when
IPv6 is enabled.

This is a workaround for the missing ares_getaddrinfo() and is a lot
easier to implement.

Note that as long as c-ares returns IPv4 addresses when IPv6 addresses
were requested but missing, this will cause a host's IPv4 addresses to
occur twice in the DNS cache.

URL: http://curl.haxx.se/mail/lib-2010-12/0041.html

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remove the CVSish $Id$ lines

Constantine Sapuntzakis refactoring of async callbacks, allowing
removal of Curl_addrinfo_copy(), Curl_addrinfo6_callback(), and
Curl_addrinfo4_callback()

VMS specific preprocessor symbol checking adjustments

libcurl's memory.h renamed to curl_memory.h

Moved potential inclusion of system's malloc.h and memory.h header files to
setup_once.h. Inclusion of each header file is based on the definition of
NEED_MALLOC_H and NEED_MEMORY_H respecti

Moved potential inclusion of system's malloc.h and memory.h header files to
setup_once.h. Inclusion of each header file is based on the definition of
NEED_MALLOC_H and NEED_MEMORY_H respectively.

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Use our Curl_addrinfo definition even when an addrinfo struct is available.

Use a wrapper function to call system's getaddrinfo().

Removed unneeded includes of signal.h and setjmp.h

ntoa() and inet_ntoa_r() no longer used

Adapted the c-ares code to the API change c-ares 1.5.0 brings in the
notifier callback(s).

update copyright year

Removed inclusion of <sys/types.h> and <sys/stat.h> in .c-files
since they're already included through "setup.h".

Simplify check for NEED_MALLOC_H, and make more explicit that NEED_MALLOC_H shall be defined if <malloc.h> header file must be included even when including <stdlib.h>.

Added note for CURLRES_ARES and CURLRES_IPV6.

include <malloc.h> only if HAVE_MALLOC_H and NEED_MALLOC_H are both defined.

Roland Blom filed bug report #1481217
(http://curl.haxx.se/bug/view.cgi?id=1481217), with follow-ups by Michele Bini
and David Byron. libcurl previously wrongly used GetLastError() on windows

Roland Blom filed bug report #1481217
(http://curl.haxx.se/bug/view.cgi?id=1481217), with follow-ups by Michele Bini
and David Byron. libcurl previously wrongly used GetLastError() on windows to
get error details after socket-related function calls, when it really should
use WSAGetLastError() instead.

When changing to this, the former function Curl_ourerrno() is now instead
called Curl_sockerrno() as it is necessary to only use it to get errno from
socket-related functions as otherwise it won't work as intended on Windows.

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Use the HAVE_MALLOC_H and HAVE_PROCESS_H defines
(more logical).

only define _REENTRANT if not already defined, and only in setup.h

Updated the copyright year since changes have been this year.

FTP code turned into state machine. Not completely yet, but a good start.
The tag 'before_ftp_statemachine' was set just before this commit in case
of future need.