Experimental Physics and Industrial Control System
Hi,
On Tuesday 04 November 2008 10:18:17 Dehong Zhang wrote:
>
> We are using R3.14.8. Could you please tell me how to do it with
> both 3.14.8 and 3.14.10? We may upgrade soon.
> > On Tuesday 04 November 2008 09:30:01 Dehong Zhang wrote:
> > > How can I force an IOC to use the time from its own system,
> > > instead of reaching out to the master timestamp server or the
> > > boot host?
I'm going to assume that you're asking about IOCs running on vxWorks; RTEMS is
a little different, but any workstation OS is already using the system clock
to obtain the current time.
If your vxWorks boot image already has software included to synchronize the OS
clock to an external time source, you can probably get away with just setting
the EPICS_TS_NTP_INET environment variable to 127.0.0.1. This will stop it
from contacting the boot host, and all attempts to get the time over NTP will
fail (unless your IOC is also acting as an NTP server; if that's the case,
use the IP address of a machine that will never respond to NTP requests).
One disadvantage of this approach is that you'll get one error message during
IOC initialization when the sync fails.
To avoid that error, in R3.14.8 you can register your own time provider
routine in place of the regular EPICS one as long as you do so before
iocInit(). Your code should #include "iocClock.h" and call
iocClockRegister(&getCurrent, NULL) where getCurrent is your provider
routine.
For R3.14.10 you should look at the new API in R3.14.10 which implements a
pluggable time and event provider management subsystem. That's documented in
the Application Developers Guide sections 9.7 and 20.6.
HTH,
- Andrew
--
Talk is cheap. Show me the code. -- Linus Torvalds
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