"Device busy" When Reopening Serial Port Post: 302581016

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Operating Systems Solaris "Device busy" When Reopening Serial Port Post 302581016 by Jim Ryan on Sunday 11th of December 2011 09:12:14 PM

12-11-2011

Registered User

Thank you. Will the lock file appear in the same directory as the port?

---------- Post updated at 08:26 PM ---------- Previous update was at 08:21 PM ----------

The machine has two RS 45 jacks used as serial ports. I plug in RS-45-to-serial (9-pin serial) adapter cables. These are indeed the names of the ports. I will find out the card and driver. I'm using the Java Communications library ("Java Comm") as an interface between my Java code and the ports.

I appreciate the help, all.

---------- Post updated at 09:00 PM ---------- Previous update was at 08:26 PM ----------

Instead of downloading lsof, I used fuser.

When the app is running, the command fuser /dev/cua/comf1a yeilds the result:

/dev/cua/comf1a: 18011o

...or a similar string. The name of a thread or a process? When I run the command for /dev/cua/comf1b, I get the same string. So, the same process is associated with both ports. When the app closes one of the ports and continues to run I get the same results. So, closing the port does not stop the port from being associated with this process, if that's what the fuser result means.

When I shut down the app, I get the following result with the command:

/dev/cua/comf1a:

i.e., nothing at all. So, if I'm interpreting fuser correctly, the results are unfortunately that the device is marked busy when the app is running and has opened the device, such that even the app itself cannot open it again.

I do not see any lock file appear in /dev/cua when the app connects to the ports.

I only see one reference to /dev/cua/comf1a (or b) other than mine on the Web: a pdf document on the perle.com site. Perhaps I have an inferior port driver/card? To disallow the very process that is using a device from reopening the device seems unreasonable. Or is there some reconfiguration I can do in Solaris?

---------- Post updated at 09:12 PM ---------- Previous update was at 09:00 PM ----------

Using com.sun.comm.SolarisDriver

Jim Ryan

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LEARN ABOUT MOJAVE

jconsole

jconsole(1)						      General Commands Manual						       jconsole(1)

NAME

       jconsole - J2SE Monitoring and Management Console

SYNOPSIS

       jconsole [ options ] [ pid | [ host:port ...  ] ]

PARAMETERS

       pid	      Process  ID of a Java VM that was started with -Dcom.sun.management.jmxremote option on the same machine. See JMX Monitoring
		      and Management for details at http://java.sun.com/j2se/1.5.0/docs/guide/management/agent.html.

       host:port      Host name on which the Java VM is running and the port number through which the Java VM's JMX Connector is  published.   See
		      JMX Monitoring and Management for details at http://java.sun.com/j2se/1.5.0/docs/guide/management/agent.html.

DESCRIPTION

       The  jconsole  command launches a graphical console tool that enables you to monitor and manage Java applications and virtual machines on a
       local or remote machine.

       NOTE- This tool is experimental and may not be available in future versions of the JDK.

OPTIONS

       -interval=n    Set the update interval to n seconds (default is 4 seconds)

       -notile	      Do not tile windows initially (for two or more connections)

       -version       Output version information abd exit.

       -help	      Output help message and exit.

SEE ALSO

       Monitoring and Management for Java Platform at http://java.sun.com/j2se/1.5.0/docs/guide/management/index.html

								    06 Feb 2004 						       jconsole(1)