Argonne National Laboratory

Experimental Physics and
Industrial Control System

1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  <20122013  2014  2015  2016  2017  2018  2019  Index 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  <20122013  2014  2015  2016  2017  2018  2019 
<== Date ==> <== Thread ==>

Subject: RE: asynManager isConnected
From: <matthew.pearson@diamond.ac.uk>
To: <jlmuir@imca-cat.org>
Cc: tech-talk@aps.anl.gov
Date: Fri, 1 Jun 2012 15:45:25 +0000
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

-- 
This e-mail and any attachments may contain confidential, copyright and or privileged material, and are for the use of the intended addressee only. If you are not the intended addressee or an authorised recipient of the addressee please notify us of receipt by returning the e-mail and do not use, copy, retain, distribute or disclose the information in or attached to the e-mail.
Any opinions expressed within this e-mail are those of the individual and not necessarily of Diamond Light Source Ltd. 
Diamond Light Source Ltd. cannot guarantee that this e-mail or any attachments are free from viruses and we cannot accept liability for any damage which you may sustain as a result of software viruses which may be transmitted in or with the message.
Diamond Light Source Limited (company no. 4375679). Registered in England and Wales with its registered office at Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, United Kingdom
 





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

Navigate by Date:
Prev: RE: mbbi/mbbo Mask values Dalesio, Leo
Next: Re: mbbi/mbbo Mask values Andrew Johnson
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  <20122013  2014  2015  2016  2017  2018  2019 
Navigate by Thread:
Prev: Re: asynManager isConnected J. Lewis Muir
Next: Re: asynManager isConnected Eric Norum
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  <20122013  2014  2015  2016  2017  2018  2019 
ANJ, 18 Nov 2013 Valid HTML 4.01! · Home · News · About · Base · Modules · Extensions · Distributions · Download ·
· Search · EPICS V4 · IRMIS · Talk · Bugs · Documents · Links · Licensing ·