Am 04/02/2014 03:06 PM, schrieb Martin Troxler:
On 02.04.2014 14:42, Matthias Liermann wrote:
Hello,
We use Etherlab 2.0 for the automation of a hydraulic test rig. We
would like to give users without admin rights the permission to
execute control programs which have been built with the Simulink coder
and the etherlab toolbox. We set the udev rules from the etherlab
documentation to allow user permission for the Ethercat device.
KERNEL ==" EtherCAT [0 -9]*" , MODE ="0664" , GROUP =" users "
When calling the executable we get the error message:
mlockall() failed: Cannot allocate memory
Setting SCHED_FIFO with priority 99 failed: Operation not permitted
We can change the capability of the executable with setcap (sudo
setcap cap_ipc_lock=ep ./Test2ndOrderSystem). But this doesn’t help
because we need administrator rights to change that too.
There are three steps that need root capabilities when starting a real
time EtherLab application:
1) Opening EtherCAT
2) Call to mlockall()
3) set scheduling policy to SCHED_FIFO
Thank you, Matthias Liermann
Hi,
Add your user to a group 'realtime', then add a file
'realtime_limits.conf' to /etc/limits.d containing
@realtime - rtprio 99
@realtime - memlock unlimited
You can also specify a user in a limits.conf file by omitting the @ sign.
Limits are implemented using pam_limits.so, but on our system (openSUSE
12.2) the configuration lies under /etc/security/limits.conf and
/etc/security/limits.d/*.conf
- Richard
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