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<== Date ==> <== Thread ==>

Subject: Re: asynManager isConnected
From: Eric Norum <eric@norum.ca>
To: Mark Rivers <rivers@cars.uchicago.edu>
Cc: "tech-talk@aps.anl.gov" <tech-talk@aps.anl.gov>
Date: Sat, 2 Jun 2012 07:50:16 -0700
Also, are you specifying the IP address as a number or a DNS name?  Perhaps the problem is in your DNS lookup rather than in the connect() call.
	and does this problem go away with R4-19?
On Jun 2, 2012, at 6:30 AM, Mark Rivers wrote:

>> That's what I was hoping to do too, but I'm not getting a return from the writeRead function. 
>> It blocks forever (at least, more than 15 mins) if I attempt a writeRead using the un-connected IP port. 
>> Eric suggested this might be due to the operating system timeout on TCP connections (which I gather can be fixed to infinite).
> 
> Was that IP port ever connected while this IOC was running?  Or was it always unavailable?
> 
> Mark
> 
> ________________________________________
> From: tech-talk-bounces@aps.anl.gov [tech-talk-bounces@aps.anl.gov] on behalf of matthew.pearson@diamond.ac.uk [matthew.pearson@diamond.ac.uk]
> Sent: Friday, June 01, 2012 10:45 AM
> To: jlmuir@imca-cat.org
> Cc: tech-talk@aps.anl.gov
> Subject: RE: asynManager isConnected
> 
> Thanks Lewis, Mark and Eric,
> 
>> 
>> I don't know of a function in Asyn that allows one to determine
>> whether the IP socket is connected.  I always just determine
>> this based on the asynStatus returned from a read or write.  But
>> maybe there's a way that I don't know about?
>> 
>> 
> 
> That's what I was hoping to do too, but I'm not getting a return from the writeRead function. It blocks forever (at least, more than 15 mins) if I attempt a writeRead using the un-connected IP port. Eric suggested this might be due to the operating system timeout on TCP connections (which I gather can be fixed to infinite).
> 
> I'm probably doing something wrong, because I have the asynManager isConnected problem too.
> 
> The reason I'm interested in understanding this, rather than just working around it, is because I want to handle connections to ethernet PMAC motor controllers automatically if they come up *after* the IOC has already started. Currently we have to restart an IOC if any of our PMACs come up that were turned off when the IOC was started.
> 
> Cheers,
> Matt
> 
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-- 
Eric Norum
eric@norum.ca






References:
asynManager isConnected matthew.pearson
Re: asynManager isConnected J. Lewis Muir
RE: asynManager isConnected matthew.pearson
RE: asynManager isConnected Mark Rivers

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