Experimental Physics and
Industrial Control System

"Thompson, David H." <[email protected]> · Tue, 31 Jul 2007 13:02:37 -0400

The time(0) will return the number of seconds that the IOC has been
running unless you set it.  Unless the ioc has been up for a year ctime
would convert that into a date in 1970 since time(0) is 1/1/70 00:00
GMT.

Out kernels make a call to sntpTimeGet() and then a call to
clock_settime() before running the startup script.  That gets it right
for a while but it will drift.  You can make these calls from the top of
the startup script so long as you malloc a block of memory to hold a
struct timespec to pass to the two calls.

The generalTime driver may do the same thing.

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Kevin M. Peterson
Sent: Tuesday, July 31, 2007 12:28 PM
To: tech-talk
Subject: VxWorks time()

After upgrading an ioc from:

Processor: MVME2700
BSP: mv2700-asd8_nodns
EPICS version: R3.13.9
synApps version: 4-6

to:

Processor: MVME5100
BSP: mv5100-asd8_nodns
EPICS version: R3.14.8.2
synApps version: 5_2_test

a sequence program that writes the current date and time
into a file no longer logs the correct time.

The time on the ioc is correct:

lga> date
2007/07/31 11:14:56.572507
value = 27 = 0x1b
lga>

but the method used by the sequence program which worked
before the upgrade, no longer behaves properly:

lga> systime = time(0)
systime = 0x1e1a8d10: value = 423436 = 0x6760c
lga> printf("%s",ctime(&systime))
MON JAN 05 15:37:16 1970
value = 25 = 0x19
lga>

Originally I thought that something might have changed in the
sequencer but since I see the same incorrect behavior on the
VxWorks console I'm forced to look elsewhere for the problem.

The VxWorks documentation says time() should return the current
time if passed NULL (which the sequence program does).  Is time()
broken in mv5100-asd_nodns?  If not, where else can I look for a
potential misconfiguration?

Thanks ahead of time,

Kevin

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System