Hi, I am writing some software that needs to access the PTP hardware clock directly. The system clock is not set up to be synchronised to PTP. I have found from the documentation that I can do this by opening /dev/ptpn, converting the device ID to a clock ID and calling clock_gettime().
The network card containing the desired PTP clock is defined by the user of the software using the Linux network card interface name. This name is written to /etc/ptp4l.conf. I have found that I can extract this name from ptp4l.conf using grep and can then call ethtool to provide the PTP Hardware Clock number, n. I am then fairly certain that the associated PTP hardware clock device path is /dev/ptpn. I can also read the name of the directory in /sys/class/net/<interface name>/device/ptp, to get the PTP device path associated with the interface, avoiding the need to use ethtool. 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? Best Regards, Tony May ::DISCLAIMER:: E-mail communication is confidential and intended solely for the addressee(s). Any unauthorized review, use, disclosure or distribution is prohibited. If you believe the e-mail message has been sent to you in error, please notify the sender by replying to the e-mail transmission and delete the message without disclosing it. Thank you.
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