Python pyparallel

MrGorby2u · 08-04-2008, 01:43 AM

After installing pyparallel on Ubuntu Hardy and running the following piece of code I get the permission denied error listed below.

Code:

Python 2.5.2 (r252:60911, Jul 31 2008, 17:28:52) 
[GCC 4.2.3 (Ubuntu 4.2.3-2ubuntu7)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import parallel
>>> p=parallel.Parallel()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.5/site-packages/parallel/parallelppdev.py", line 186, in __init__
    self._fd = os.open(self.device, os.O_RDWR)
OSError: [Errno 13] Permission denied: '/dev/parport0'
>>>

After some googling I came across the suggestion of:

Code:

rmmod lp

Does anyone know why this would work?

mongoosecage · 08-05-2008, 04:07 PM

well... just trying... rm means remove, mod is the module... lp is a module so basically
you must be saying:

remove the lp module... I found it quite related to virtualization like vmware... you got something with parallels...any connection?

MrGorby2u · 08-07-2008, 12:32 AM

Quote:

Originally Posted by mongoosecage

well... just trying... rm means remove, mod is the module... lp is a module so basically
you must be saying:

remove the lp module... I found it quite related to virtualization like vmware... you got something with parallels...any connection?

Yep, I knew it removed the module from the kernel. I guess what I was more interested in is why the parallel port is NON accessible while the lp module is installed? I'm guessing the lp module takes control of the port?

MrGorby2u · 08-18-2008, 03:35 PM

So running the command rmmod lp does open the parallel port, but only for root. Does anyone know how to allow other users to also have access?

mongoosecage · 08-19-2008, 05:09 AM

Quote:

Originally Posted by MrGorby2u

So running the command rmmod lp does open the parallel port, but only for root. Does anyone know how to allow other users to also have access?

hmm... I honestly have no clue about this... but just for the sake of it could you tell me what you are doing? making a python program of some sort?

Agrouf · 08-19-2008, 06:30 AM

What about chmod g+rw /dev/parport0 and make sure you are in the group whose parport0 belongs to?