Coding a display trace exit routine

An application that will be using component trace might have a display trace exit routine that provides status information about the component trace for the DISPLAY TRACE operator command. You are responsible for writing this optional routine.

A display trace exit routine is desirable if the component trace changes the trace mode, buffer size, or options independent of the TRACE CT operator command. There may be conditions under which the component trace may need to change the status of the trace, such as:
  • If the operator issues the TRACE CT command to change the buffer size, the component trace might round the buffer size up or down. When a D TRACE command is displayed and a display trace exit routine is provided, the display exit can provide the buffer size to be displayed. If no display trace exit routine is provided, then the buffer size specified on the TRACE CT command is displayed.
  • If a problem occurs, the component trace might decide to stop or start tracing, or change trace options.
Parent topic: Tracing applications using component trace