gdb.info: Create and Delete Tracepoints

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Create and Delete Tracepoints

`trace'
     The `trace' command is very similar to the `break' command.  Its
     argument can be a source line, a function name, or an address in
     the target program.  *Note Set Breaks::.  The `trace' command
     defines a tracepoint, which is a point in the target program where
     the debugger will briefly stop, collect some data, and then allow
     the program to continue.  Setting a tracepoint or changing its
     commands doesn't take effect until the next `tstart' command;
     thus, you cannot change the tracepoint attributes once a trace
     experiment is running.
     Here are some examples of using the `trace' command:
          (gdb) trace foo.c:121    // a source file and line number
          (gdb) trace +2           // 2 lines forward
          (gdb) trace my_function  // first source line of function
          (gdb) trace *my_function // EXACT start address of function
          (gdb) trace *0x2117c4    // an address
     You can abbreviate `trace' as `tr'.
     The convenience variable `$tpnum' records the tracepoint number of
     the most recently set tracepoint.
`delete tracepoint [NUM]'
     Permanently delete one or more tracepoints.  With no argument, the
     default is to delete all tracepoints.
     Examples:
          (gdb) delete trace 1 2 3 // remove three tracepoints
          (gdb) delete trace       // remove all tracepoints
     You can abbreviate this command as `del tr'.