Experimental Physics and
Industrial Control System

 

From: Ralph Lange

Date: 2015-04-17 16:44

To: EPICS Tech-Talk

Subject: Re: iocStats reboot question

Hi Geyang,

Under Linux (and the other host-type OSs), an IOC is a single multi-threaded process.
So, naturally, "rebooting" an IOC means restarting the IOC process, which is usually done by shutting down or killing the current process and letting the wrapper (e.g. procServ) handle the restart.

Very often, many Linux IOCs are run on a single host: 20-30 are quite common, I have seen up >300 IOCs on a server-class Solaris machine.
I am sure you understand that allowing to reboot the server from any of these IOCs would be a bad idea.

Also, rebooting a server usually needs root access. IOCs should not be run as root.

Cheers,
~Ralph

On 17/04/2015 09:36, Silver wrote:

hi, 

in IOC Status and Control (devIocStats), it has an reboot function in subroutine record, that is ,in devIocStatsSub.c file, it calls reboot function of linux.

I am wandering why this call just kill the ioc process instead of rebooting the machine? as in manual of reboot function (http://man7.org/linux/man-pages/man2/reboot.2.html)

Thanks a lot for your help.

  

 

 

 

 

---

Best wishes

Geyang 2015-04-17

 

 

References:

iocStats reboot question Silver

Re: iocStats reboot question Ralph Lange

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