[RFC] Fix socket.Connect() to throw a NoRouteToHostException when given an unreachable ip address

[Omair Majid]

Hi,

When using connect() in non-blocking mode, it can return an error other 
than EINPROGRESS immediately if there is no route to the host specified. 
The current implementation throws a ConnectException in this case. The 
Java program calling socket.Connect() receives a ConnectException 
instead of a NoRouteToHostException. The attached patch adds a check to 
deal with this case. The java/net/ipv6tests/TcpTest.java JTreg (jdk) 
test now passes with this fix for me.

Changelog:
2009-03-27  Omair Majid  <omajid at redhat.com>

     * patches/icedtea-network-unreachable.patch: New file. Check for
     EHOSTUNREACH and ENETUNREACH early on when establishing a
     connection.
     * Makefile.am (ICEDTEA_PATCHES): Apply the above.
     * HACKING: Document the above.

Cheers,
Omair
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