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Port in use problem (Mac)

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Mi, 09/21/2011 - 17:56 – Hannu Visti

Hi,

Is there a solution to the "port in use" problem that seems to be troubling also others than me?  The system is Mac (Lion) and GPS device is Blumax gps-4044.   I've set up the bluetooth connection and these devices were created:

crw-rw-rw-  1 root  wheel   18,   7 21 Sep 16:51 /dev/cu.iBTAGPS-SPPslave-1

crw-rw-rw-  1 root  wheel   18,   6 21 Sep 16:27 /dev/tty.iBTAGPS-SPPslave-1

If I just cat the device (cat /dev/tty/iBTAGPS-SPPslave-1, the bluetooth connection is set up and data starts to appear.  However, if I try to connect BT747, I always get the port in use error:1600837 - Classgps.connection.GPSRxTxPortInfo: trying to open '/dev/cu.iBTAGPS-SPPslave-1'Error: Port /dev/cu.iBTAGPS-SPPslave-1is currently in usegnu.io.PortInUseException: Unknown ApplicationReboots etc don't help at all.  Is there a workaround to this?  I've tried the latest release and development version of BT747 but the result is always the same. /hv

‹ Solved: java.lang.NoClassDefFoundError: Could not initialize class gnu.io.CommPortIdentifier Holux m-241 not readable on 64-bit PC ›
Mi, 09/21/2011 - 20:18 – mdeweerd
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Hi If the port is in use then

Hi

If the port is in use then this can be due to:

1. Another instance of BT747 keeping the port open;

2. Another program keeping the port open - quite often that is 'gpsd'.

 

You'ld have to identify the program that opens the port.  There is a 'unix' program that can identify which program has an open handle, I do not remember the name right now.  As far as I remember the same one can be made available on Mac.

So, 08/14/2016 - 10:11 – Jonny (nicht überprüft)

I know this is an extremely

I know this is an extremely old question. However I am having the exactly same problem. I am on Mac OSX 10.11.5 and try to connect to a Holux M1000c. How can I find out why the port is already in use? Or is it some sort of driver error?

So, 08/14/2016 - 13:19 – mdeweerd
Bild von mdeweerd

One of the tools existing on

One of the tools existing on unix like systems to find out which program is using a "filesystem" resource or network resource, is "lsof".

 

It seems that it is pre-installed on mac, so you have to do a "lsof /dev/<port>" (in a terminal)  which should provide a process id and then you can lookup this process id to find the corresponding program that is locking the port.