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ENDRUN(4) Device Drivers Manual ENDRUN(4)

endrun
EndRun Technologies native time-of-day message timedelta sensor

pseudo-device endrun [count]

This line discipline interfaces serial EndRun Technologies devices.

The line discipline is enabled by the following sequence:

#include <sys/ioctl.h>
int ldisc = ENDRUNDISC, fildes; ...
ioctl(fildes, TIOCSETD, &ldisc);

The byte stream is unaltered by the line discipline which maintains a timedelta sensor using the EndRun data. The timedelta sensor will appear as endrun* in the list of sensors and the delta (in nanoseconds) between the received time information and the local time can be accessed through the sysctl(8) interface.

The quality of the timedelta is reported as the sensor status:
OK
The time information is valid. The timedelta is safe to use for applications like ntpd(8).
WARN
The attached receiver has been indicating a warning condition for at least the last ten minutes. The timedelta should be used with care.
CRITICAL
tty timestamping has been turned on but there is no PPS signal present or the receiver indicated a warning condition for at least the last twenty minutes. Check your hardware.

The status of a second sensor is used to report the status of the device itself using the Time Figure Of Merit (TFOM) character:

OK
The clock is synchronized. TFOM is 6-8.
WARN
The clock is synchronized and the time error is greater than 10ms or the clock is in the unsynchronized state. TFOM is 9.
CRITICAL
The TFOM is invalid.

tty(4), ldattach(8), ntpd(8), sysctl(8)

The endrun interface first appeared in OpenBSD 4.6.
January 15, 2015 OpenBSD-current