On 9/5/2020 10:48 AM, Richard Cochran wrote:
> On Fri, Sep 04, 2020 at 04:14:49PM +0000, Tony May via Linuxptp-users wrote:
>
>> Is there a better way to find the PTP device path for a network
>> interface based on its name? In particular, is there a library that
>> I can include in some C/C++ code that I can call to resolve the
>> device path from the interface name?
>
> I don't know of any library for that. The methods you described are
> in fact the ways to find out the association between a network
> interface and a PHC character device. So any such library would have
> to do what you described anyhow.
>
> Personally, I use a shell script for that. For example:
>
> ETHA=eth6
> DEVINDEX=$(ethtool -T $ETHA | awk '/PTP/ {print $4}')
> DEVA=/dev/ptp$DEVINDEX
>
>
> Thanks,
> Richard
>
>
FWIW, it's fairly trivial to write your own C code that calls the
ETHTOOL_GTSINFO ioctl.
Thanks,
Jake
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