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"Device busy" When Reopening Serial Port

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Operating Systems Solaris "Device busy" When Reopening Serial Port
# 1  
Old 12-11-2011
"Device busy" When Reopening Serial Port
Any help much appreciated. I am a Java developer, not a Solaris adept. I'm having an issue reopening serial port with the Java app I am developing.

I develop in Windows and deploy the app on Solaris 10 (Sunfire X4170 with Xeon.) On the target machine my app uses the two serial ports /dev/cua/comf1a and /dev/cua/comf1b. If a port cable is unplugged my app detects this (by heartbeats failing to be acknowledged) and closes and then reopens the port. There is no issue in Windows; the app can close and open the port again. But on Solaris, although the app has no trouble opening ports at launch, I get "Device busy" when the app tries to reopen the port, having closed it. I can then shut down and quickly restart the app, and it has no issue opening the ports again on restart. I am sure I am not keeping any ties between the app and the closed port; I am closing input streams and output streams. And there is no issue in Windows. So I think this is an OS-level issue. I have tried making the app wait 15 minutes after closing and before reopening; this doesn't help. I'm wondering whether Solaris has marked the port as in use by the app for the duration of the run of the app so that the port may be closed but not reopened, even by the same app itself.

Thank you for any help you can give me with this.
# 2  
Old 12-11-2011
When it says 'device busy' it generally means so. Try using a utility like lsof to see what's holding it open.
This User Gave Thanks to Corona688 For This Post:
Jim Ryan
# 3  
Old 12-11-2011
Thanks. I'll download that utility try it tomorrow morning.
# 4  
Old 12-11-2011
Another possibility is the device not asserting a hardware control line when the serial port is set for CTS/RTS hardware handshaking, which could prevent the port from opening, I think.
This User Gave Thanks to Corona688 For This Post:
Jim Ryan
# 5  
Old 12-11-2011
Thank you. I can only vaguely understand that. Please excuse my ignorance here. I will investigate that. If it is so, is there a remedy?
# 6  
Old 12-11-2011
also, kindly check if the port opened by your app, has a lock file created ?
This User Gave Thanks to solaris040 For This Post:
Jim Ryan
# 7  
Old 12-11-2011
Quote:
Originally Posted by Jim Ryan
On the target machine my app uses the two serial ports /dev/cua/comf1a and /dev/cua/comf1b.
As far as I know, the X4170 only has a single serial port and I never heard of comf1a/comf1b devices on Solaris. What card and driver are you using ?

---------- Post updated at 22:03 ---------- Previous update was at 21:57 ----------

Quote:
Originally Posted by Corona688
When it says 'device busy' it generally means so. Try using a utility like lsof to see what's holding it open.
On Solaris, fuser and pfiles can be used instead of lsof to get that information.
This User Gave Thanks to jlliagre For This Post:
Jim Ryan
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