"Device busy" When Reopening Serial Port Post: 302580967

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Operating Systems Solaris "Device busy" When Reopening Serial Port Post 302580967 by Jim Ryan on Sunday 11th of December 2011 12:15:47 PM

12-11-2011

Registered User

"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.

Jim Ryan

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LEARN ABOUT OPENSOLARIS

stmfofflinetarget

stmfOfflineTarget(3STMF)			   SCSI Target Mode Framework Library Functions 			  stmfOfflineTarget(3STMF)

NAME

       stmfOfflineTarget - take offline a target port that is currently in the online state

SYNOPSIS

       cc [ flag... ] file... -lstmf [ library... ]
       #include <libstmf.h>

       int stmfOfflineTarget(stmfDevid *target);

PARAMETERS

       target	 The identifier of the target port to offline.

DESCRIPTION

       The  stmfOfflineTarget()  function takes offline a target port that is currently in the online state. Once in the offline state, the target
       port will no longer be capable of servicing requests in the system.

       This API call can be used to take offline a target port device for servicing. Once the target port is offline, it will no longer be  avail-
       able  to  any  entities	outside  of  the  SCSI	Target Mode Framework. Any initiator ports that currently have sessions established by the
       offlined target port will be logged out.

RETURN VALUES

       The following values are returned:

       STMF_ERROR_BUSY	      The device is currently busy.

       STMF_STATUS_SUCCESS    The API call was successful.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Committed 		   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       libstmf(3LIB), attributes(5)

SunOS 5.11							    9 Jun 2008						  stmfOfflineTarget(3STMF)