Supports event tracing.
The /dev/systrace and /dev/systrcctl special files support the monitoring and recording of selected system events. Minor device 0 of the trace drivers is the interface between processes that record trace events and the trace daemon. Write trace events to the /dev/systrace file by the trchk and trcgen subroutines and the trcgenk kernel service. Minor devices 1 through 7 of the trace drivers support generic trace channels for tracing system activities such as communications link activities.
The trace special file is part of Software Trace Service Aids package.