Dirk Manske's fix that makes sure we cancel the ares resolve when we time out
from a name resolve. Without this, we leak memory!

removed my previously attempted fix for ares timeouts, not needed

Roy Shan fixed a case that prevented ares name resolve timeouts to occur.

Remove the elapsed time from the most recent select() only.

The asynch name resolve methods now all use CURL_TIMEOUT_RESOLVE for
the specific time to wait for a resolve. The definition is at the top of
this source file.

Dirk Manske found out the Curl_wait_for_resolv() timed out too early.

Lots of comments added an clarified. Added timeout for the ares version
of Curl_is_resolved() to address Roy Shan's reported problem.

The select() timeout is better not static since some implementation actually
might change it. I don't *think* it does it when the timeout is 0,0 but it
is better to be sure...

G�nter Knauf's NetWare changes.

store times in time_t

only build with the windows threading trace code if
DEBUG_THREADING_GETHOSTBYNAME is defined

tv_sec is an int, so we explicitly typecast the result of long - long to
an int when we assign it.

use size_t to keep strlen() results

simplied how create_hostcache_id() is used, and also its function somewhat
cleared up some ssize_t/size_t mixups

Gisle Vanem brings name resolving timeout possibilities to windows people.
This works by magicly starting up a new thread that can be killed when the
timeout is reached. testtesttest!

No longer uses the 'ret' variable in the plain ipv4-version of
my_getaddrinfo() (caused a warning by the IRIX MIPSPro compiler). Also
clarified the situation for the 3-arg version of gethostb

No longer uses the 'ret' variable in the plain ipv4-version of
my_getaddrinfo() (caused a warning by the IRIX MIPSPro compiler). Also
clarified the situation for the 3-arg version of gethostbyname_r() with a huge
comment.

show more ...

Make sure dns cache timeout -1 really means forever, as it is documented to
be. Simply skip the pruning.

Make the 'areschannel' get created in the curl_easy_init() and re-use that
same channel during the whole curl handle's life until curl_easy_cleanup().

Mark the dns entry 'inuse' properly even when used from the cache. This
seems to correct some host cache screw-ups I could reproduce.

Make hostcache_fixoffset() take a long for offset, to fully work with 64bit
archs, also no longer typecast pointers to ints as that is a nono on 64bit
systems.

hide the pack_hostent proto if ipv6 is enabled, as figured out by Tor Arntsen

adjusted to the modified ares_strerror() function

NOTE that this breaks ares-compatibility, we have now officially taken the
turn into the c-ares path. We will now officially depend on c

adjusted to the modified ares_strerror() function

NOTE that this breaks ares-compatibility, we have now officially taken the
turn into the c-ares path. We will now officially depend on c-ares for asynch
name resolves.

show more ...

Dirk Manske fixed the ares usage even more. We could get a timeout from ares
as well, and when failing and not getting a timeout we now include the
error message ares can provide us with.

Timeout slow ares name lookups. This is based on the patch brought by
Dirk Manske, but modified by me.

fixed the Curl_resolv()'s return code when the looked up host was already
in the cache (Vincent Bronner)