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DT(4) Device Drivers Manual DT(4)

dtdynamic tracer

pseudo-device dt

System and application tracing can happen in the kernel. It has to be configured and enabled through the ioctl(2) interface exposed by the pseudo-device /dev/dt.

This device can only be opened when the kern.allowdt sysctl(2) variable is set.

dynamic tracing device.

ioctl(2), bt(5), btrace(8)

The dt dynamic tracing mechanism first appeared in OpenBSD 6.7.

January 30, 2020 OpenBSD-6.7