Re: Secure EMC run

[Will Shackleford <shackle-at-cme.nist.gov>]

> Date: Thu, 13 Jul 2000 11:11:22 -0400 (EDT)
> Originator: emc-at-nist.gov
> From: Ray <rehenry-at-up.net>
> To: Multiple recipients of list <emc-at-nist.gov>
> Subject: Secure EMC run
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> 
> 
> Hi
> 
> A while back we had a brief discussion on running EMC with a user other
> than root.  I'm working on a handbook page that describes that procedure. 
> You can review my progress on that page at:
> 
> 	http://www.linuxcnc.org/handbook/faq/faqemcsafe.html
> 
> I wanted to prove the procedure so I set up a Linux group named
> operator and an operator named ray. But I couldn't get it to run. (same
> messages as below)
> 
> So I made an entire EMC install (June 7) as ray, copied over my personal 
> run and ini file, and set permissions as Fred indicated in his post
> quoted in the url above.  But when I run it, I get the following feedback. 
> 
>     [ray-at-localhost emc]$ ./tk.run
>     Current platform is linux_2_2_14
>     Current real-time platform is rtlinux_2_2
>     inivar = plat/linux_2_2_14/bin/inivar
>     INIFILE = tk.ini
>     starting emc...
>     starting freqmod.o...done
>     starting minimillio...done
>     starting minimilltask...done
>     running tkemc...
>     open failed: Permission denied
>     mbuff_alloc failed.
>     emctaskmain.cc 2055: can't initialize IO
>     open failed: Permission denied
>     emcsh.cc 4079: can't connect to emc
>     [ray-at-localhost emc]$
> 
> Thinking there was an error in the setup, I ran it as root and it worked
> okay.  I noticed that ownership, group, and permissions for the ini and
> var files seem to get changed to reflect the current usr - but not always.
> 
> Got a clue?
> 
> Ray
> 
> 

I think you need to 

chmod a+rw /dev/mbuff


-- Will


---------------------------------------------------------------
William Penn Shackleford III			shackle-at-nist.gov
National Institute of Standards & Technology	Tel:	(301) 975-4286
100 Bureau Drive Stop 8230  			FAX:	(301) 990-9688
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