[Rxtx] Linux problem

[Trent Jarvi]

On Fri, 27 Feb 2009, François-Xavier GENDRIN wrote:

> 
> Hi,
> 
>  
> 
> I use latest bin from wiki download and I run jar attached program.
> 
>  
> 
> I use a debian Linux 2.6.26-1-686 #1 SMP Wed Sep 10 16:46:13 UTC 2008 i686
> GNU/Linux
> 
> I run the program in three shells different at the same time
> 
> java -cp "testSerial.jar:RXTXcomm.jar" serial.Main2 2 /dev/ttyS0 2> S0
> 
> java -cp "testSerial.jar:RXTXcomm.jar" serial.Main2 2 /dev/ttyS4 2> S1
> 
> java -cp "testSerial.jar:RXTXcomm.jar" serial.Main2 2 /dev/ttyS5 2> S5
> 
>  
> 
> ttyS4 and ttyS5 are moxa port.
> 
>  
> 
> I have following errors in one of my shell (not all the time …)
> 
> RXTX fhs_lock() Error: creating lock file: /var/lock/LCK..ttyS0: File exists
> 
> RXTX fhs_lock() Error: creating lock file: /var/lock/LCK..ttyS4: File exists
> 
> RXTX fhs_lock() Error: creating lock file: /var/lock/LCK..ttyS0: File exists
> 
> RXTX fhs_lock() Error: creating lock file: /var/lock/LCK..ttyS4: File exists
> 
> RXTX fhs_lock() Error: creating lock file: /var/lock/LCK..ttyS0: File exists
> 
> RXTX fhs_lock() Error: creating lock file: /var/lock/LCK..ttyS4: File exists
> 
> java.io.IOException: Resource temporarily unavailable in writeArray
> 
>         at gnu.io.LPRPort.writeArray(Native Method)
> 
>         at gnu.io.LPRPort$ParallelOutputStream.write(LPRPort.java:325)
> 
>         at serial.Main2$Main2Runnable.run(Main2.java:63)
> 
>         at java.lang.Thread.run(Thread.java:619)
> 
> RXTX fhs_lock() Error: creating lock file: /var/lock/LCK..ttyS0: File exists
> 
> RXTX Warning:  Removing stale lock file. /var/lock/LCK..lp0
> 
> RXTX fhs_lock() Error: creating lock file: /var/lock/LCK..ttyS4: File exists
> 
> RXTX fhs_lock() Error: creating lock file: /var/lock/LCK..ttyS0: File exists
> 
> RXTX fhs_lock() Error: creating lock file: /var/lock/LCK..ttyS4: File exists
> 
> RXTX fhs_lock() Error: creating lock file: /var/lock/LCK..ttyS0: File exists
> 
> RXTX fhs_lock() Error: creating lock file: /var/lock/LCK..ttyS4: File exists
> 
> RXTX fhs_lock() Error: creating lock file: /var/lock/LCK..ttyS0: File exists
> 
>  
> 
>  
> 
> Anyone have idea about this, or did I have to wait the next pre-release?
>

I think these are valid resource contentions.  In order to avoid this, you 
will want to specify serial ports rather than enumerate them.

http://rxtx.qbang.org/wiki/index.php/Trouble_shooting#How_does_rxtx_detect_ports.3F__Can_I_override_it.3F


Otherwise rxtx tries to open and close all of the usual serial ports to 
determine what is available for use.

2.2 will not alter the behavior.

--
Trent Jarvi
tjarvi at qbang.org