any way to detect condition "connected to ISP but not internet"?

[Josh Mellicker]

I agree, the separate process is the key to prevent the app freeze.

Thanks for your input, I will post when we have finalized a method.

And again, this wouldn't be so big a deal except that you NEVER want a  
paying customer to have dead software they can't use.


On Jan 23, 2009, at 5:07 PM, Alex Tweedly wrote:

> Andre Garzia wrote:
>> we can use the load command in async mode and check the status... it
>> should timeout right?
>>
>>
> right. maybe.
>
> (remember there's a lot of speculation on my part, about this being  
> a DNS problem ....)
>
> Although the load url ... with callback is intended to be non- 
> blocking, there may be a difficulty. I'm sure it uses sockets and  
> the socket async mode to be non-blocking - and I suspect the problem  
> is an OS call to DNSresolve() [or similar] which is happens before  
> the scket/TCP open, and which is blocking. Since this affects (even)  
> a browser, I worry it would also affect Rev - so it might just  
> result in a blocked process. (and even if it's not DNS, whatever it  
> is fails within a browser, so may fail similarly within Rev)
>
> To feel safe, I'd want to do the network check in a separate  
> process, and have a fail-safe mechanism within the real app (i.e. it  
> detects failure rather than waiting for it). So I'd use a  
> backgrounded shell command which creates a temp file, and have the  
> real app check for that file being created/updated. Could be a ping  
> shell command, or a small standalone which loads a url, or anything  
> similar - as long as it's a separate process.
>
> -- Alex.
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