2. Types, Operators, and Expressions
8. Type and Constant Definitions
34. Statically Defined Tracing for User Applications
You can use D function calls such as trace() and printf() to invoke two different kinds of services provided by DTrace: actions that trace data or modify state external to DTrace, and subroutines that affect only internal DTrace state. This chapter defines the actions and subroutines and describes their syntax and semantics.