/dev/cuad0: Device busy

[Ganbold]

Jeremy Chadwick wrote:
> On Mon, Feb 04, 2008 at 12:53:58PM +0800, Ganbold wrote:
>   
>> Hi,
>>
>> I'm trying to use serial port but the system says device busy.
>>
>> daemon# cu -l /dev/cuad0 -s 9600
>> /dev/cuad0: Device busy
>> link down
>>     
>
> Does the same happen if you do `cu -l ttyd0 -s 9600`?
>   

It works and fstat shows:

daemon# fstat /dev/cuad0
USER     CMD          PID   FD MOUNT      INUM MODE         SZ|DV R/W NAME
daemon# fstat /dev/ttyd0
USER     CMD          PID   FD MOUNT      INUM MODE         SZ|DV R/W NAME
root     cu          5574    3 /dev         41 crw-------   ttyd0 rw  
/dev/ttyd0
root     cu          5573    3 /dev         41 crw-------   ttyd0 rw  
/dev/ttyd0
daemon#

Is it expected behaviour?

thanks,

Ganbold


>   
>> How to check whether something is using serial port?
>> Any idea?
>>     
>
> fstat should help here.
>
>   


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