On Tue, 2015-06-23 at 22:06 +0000, Daniel Le wrote:
> My Linux kernel version is 2.6.35.7 and it doesn't seem to have the
> implementation of syscall for __NR_clock_adjtime. In which kernel
> version was it initially introduced?
>
> I changed the function clock_adjtime() to use adjtimex() as shown in
> the following. Would that work fine when it's called to perform a
> clock step (with the modes ADJ_SETOFFSET bit set) and slewing? Is it
> better to use settimeofday() to step the clock? My system runs ptp4l
> in software timestamping mode.
>
> #ifndef HAVE_CLOCK_ADJTIME
> static inline int clock_adjtime(clockid_t id, struct timex *tx)
> {
> // return syscall(__NR_clock_adjtime, id, tx);
> return adjtimex(tx);
> }
> #endif
>
> The adjtimex() function does not have the clock id parameter. I'm
> unclear how to deal with it. In my debugging messages, I've only seen
> CLOCK_REALTIME whose Id is 0 which is the clock that adjtimex()
> applies to. Is clock_adjtime() executed in some case for other clock
> id such as CLOCK_MONOTONIC?
>
In hardware timestamping mode it is executed on the PHC clocks exposed
by the PTP infrastructure, which is why clockid is needed. Your kernel
does not (fully?) support the PTP core infrastructure which is the
intended use of ptp4l.
Regards,
Jake
> Thanks,
> Daniel
------------------------------------------------------------------------------
Monitor 25 network devices or servers for free with OpManager!
OpManager is web-based network management software that monitors
network devices and physical & virtual servers, alerts via email & sms
for fault. Monitor 25 devices for free with no restriction. Download now
http://ad.doubleclick.net/ddm/clk/292181274;119417398;o
_______________________________________________
Linuxptp-devel mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/linuxptp-devel
