Re: [HACKERS] listening addresses

Andrew Dunstan wrote:

>
>
> Tom Lane wrote:
>
>> Andrew Dunstan <andrew(at)dunslane(dot)net> writes:
>>
>>
>>> A small problem with it was reported to me a couple of days ago -
>>> user had firewalled off all IP6 traffic. The stats collector happily
>>> bound and connected to the socket, but all the packets fell in the
>>> bit bucket. They found it quite hard to diagnose the problem.
>>>
>>
>>
>>
>>
>>> Possible solutions that occurred to me:
>>> . an initial "hello"-"yes i'm here" exchange to validate the address
>>>
>>
>>
>> That one seems reasonable to me. Seems like it would take just a few
>> more lines of code in the loop that tries to find a working socket to
>> check that we can send a byte and receive it. You'd have to be careful
>> not to block if the socket is indeed not working ... also, is it safe to
>> assume that a byte sent with send() is *immediately* ready to recv()?
>>
>>
>>
>

Revised patch attached. I think this is about as much trouble as this
problem is worth ;-)

cheers

andrew