EHOSTUNREACH should not be considered as an exception when send on a loopback network interface.

[Charles Lee]

Hi guys,

In some linuxes, when you bind on a loopback network interface, sendto 
will be fail and errono will be set to EHOSTUNREACH.
In this situation, EHOSTUNREACH maybe need treat as INVAL: return false, 
not throw an exception.

Patch is attached.

Does anyone interested in this issue?


-- 
Yours Charles

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