/sys$common/syshlp/DBG$HELP.HLB  —  DEBUG  CANCEL  TRACE
    Cancels a tracepoint.

    Format

      CANCEL TRACE  [address-expression[, . . . ]]

1  –  Parameters 

 address-expression

    Specifies a tracepoint to be canceled. Do not use the asterisk
    (*)  wildcard character. Instead, use the /ALL qualifier. Do not
    specify an address expression when using any qualifiers except
    /EVENT, /PREDEFINED, or /USER.

2  –  Qualifiers

2.1    /ACTIVATING 

    Cancels the effect of a previous SET TRACE/ACTIVATING command.

2.2    /ALL 

    By default, cancels all user-defined tracepoints. When used
    with /PREDEFINED, it cancels all predefined tracepoints but
    no user-defined tracepoints. To cancel all tracepoints, use
    /ALL/USER/PREDEFINED.

2.3    /BRANCH 

    Cancels the effect of a previous SET TRACE/BRANCH command.

2.4    /CALL 

    Cancels the effect of a previous SET TRACE/CALL command.

2.5    /EVENT 

       /EVENT=event-name

    Cancels the effect of a previous SET TRACE/EVENT=event-name
    command. Specify the event name (and address expression, if
    any) exactly as specified with the SET TRACE/EVENT command. To
    identify the current event facility and the associated event
    names, use the SHOW EVENT_FACILITY command.

2.6    /EXCEPTION 

    Cancels the effect of a previous SET TRACE/EXCEPTION command.

2.7    /INSTRUCTION 

    Cancels the effect of a previous SET TRACE/INSTRUCTION command.

2.8    /LINE 

    Cancels the effect of a previous SET TRACE/LINE command.

2.9    /PREDEFINED 

    Cancels a specified predefined tracepoint without affecting any
    user-defined tracepoints. When used with /ALL, it cancels all
    predefined tracepoints.

2.10    /TERMINATING 

    Cancels the effect of a previous SET TRACE/TERMINATING command.

2.11    /USER 

    Cancels a specified user-defined tracepoint without affecting any
    predefined tracepoints. This is the default unless you specify
    /PREDEFINED. To cancel all user-defined tracepoints, use /ALL.

3  –  Description 

    Tracepoints can be user defined or predefined. User-defined
    tracepoints are explicitly set with the SET TRACE command.
    Predefined tracepoints, which depend on the type of program you
    are debugging (for example, Ada or multiprocess), are established
    automatically when you start the debugger. Use the SHOW TRACE
    command to identify all tracepoints that are currently set. Any
    predefined tracepoints are identified as such.

    User-defined and predefined tracepoints are set and canceled
    independently. For example, a location or event can have both
    a user-defined and a predefined tracepoint. Canceling the user-
    defined tracepoint does not affect the predefined tracepoint, and
    conversely.

    To cancel only user-defined tracepoints, do not specify
    /PREDEFINED with the CANCEL TRACE command (the default is /USER).
    To cancel only predefined tracepoints, specify /PREDEFINED
    but not /USER. To cancel both user-defined and predefined
    tracepoints, use CANCEL TRACE/ALL/USER/PREDEFINED.

    In general, the effect of CANCEL TRACE is symmetrical with
    that of SET TRACE (even though SET TRACE is used only with
    user-defined tracepoints). Thus, to cancel a tracepoint that
    was established at a specific location, specify that same
    location (address expression) with CANCEL TRACE. To cancel
    tracepoints that were established on a class of instructions
    or events, specify the class of instructions or events with the
    corresponding qualifier (/LINE, /BRANCH, /ACTIVATING, /EVENT=,
    and so on). For more information, see the qualifier descriptions.

    To cause the debugger to temporarily ignore a tracepoint, but
    retain definition of the tracepoint, use the command DEACTIVATE
    TRACE. You can later activate the tracepoint (with ACTIVATE
    TRACE).

    Related commands:

       (ACTIVATE,DEACTIVATE,SET,SHOW) TRACE
       CANCEL ALL
       (SET,SHOW,CANCEL) BREAK
       (SET,SHOW) EVENT_FACILITY

4  –  Examples 

    1.DBG> CANCEL TRACE MAIN\LOOP+10

      This command cancels the user-defined tracepoint at the
      location MAIN\LOOP+10.

    2.DBG> CANCEL TRACE/ALL

      This command cancels all user-defined tracepoints.

    3.all> CANCEL TRACE/TERMINATING

      This command cancels a previous SET TRACE/TERMINATING command.
      As a result, a user-defined tracepoint is not triggered when a
      process does an image exit.

    4.DBG> CANCEL TRACE/EVENT=RUN %TASK 3

      This command cancels the tracepoint that was set to trigger
      when task 3 (task ID = 3) entered the RUN state.
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