The systrace driver implements the DTrace syscall dynamic tracing provider. The syscall provider performs dynamic instrumentation to offer probes that fire whenever a thread enters or returns from a kernel system call entry point.
The systrace driver is not a public interface and you access the instrumentation offered by this provider through DTrace. Refer to the Solaris Dynamic Tracing Guide for a description of the public documented interfaces available for the DTrace facility and the probes offered by the syscall provider.
See attributes(5) for a description of the following attributes:
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dtrace(1M), attributes(5), dtrace(7D)
Solaris Dynamic Tracing Guide