JDK-8080990: libdt_socket/socket_md.c(202) : warning C4996: 'gethostbyname': Use getaddrinfo() or GetAddrInfoW()

[Gary Adams]

One more to fix to cover the remaining test failures I was seeing.

Previously, using inet_addr, there was a single -1 return that needed to 
be checked.
Now that we're using inet_pton, there is a -1 and a 0 error return to be 
considered.

My preference would be to leave the dbgSysInetAddr name unchanged and 
have the low level
check for inet_pton errors to simply return the -1 that was previously 
checked.

This specific issue is about the deprecation of library functions on 
windows. I'd recommend not
upgrading the other platforms at this time until a complete update is 
done for ipv6 support.

I'll post a new webrev when I've retested using the updated inet_pton 
error checking.

...
> Hi Gary,
>
>
> >/  Here's a revised webrev
> />/
> />/     http://cr.openjdk.java.net/~gadams/8080990/webrev.01/index.html  <http://cr.openjdk.java.net/%7Egadams/8080990/webrev.01/index.html>
> />/
> />/  Still testing ...
> />/
> />/  Using shutdown() fixed problems reported by the
> />/  java/nio/channelSocketChannel tests.
> /
> The fix looks good. I would think we should rename dbgsysInetAddr to dbgsysPToN and use inet_pton also for the Unix/Linux platforms. It would be the better choice there as well, though we still only support IPv4 in libdt_socket.
>
> >/
> />/  I also noticed prior use of getaddrinfo for "localhost" was not calling
> />/  freeaddrinfo.
> /
> Thanks for spotting/fixing that.
>
> Best regards
> Christoph
>
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