gdb.info: Tracepoint Variables

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Convenience Variables for Tracepoints

`(int) $trace_frame'
     The current trace snapshot (a.k.a. "frame") number, or -1 if no
     snapshot is selected.
`(int) $tracepoint'
     The tracepoint for the current trace snapshot.
`(int) $trace_line'
     The line number for the current trace snapshot.
`(char []) $trace_file'
     The source file for the current trace snapshot.
`(char []) $trace_func'
     The name of the function containing `$tracepoint'.
   Note: `$trace_file' is not suitable for use in `printf', use
`output' instead.
   Here's a simple example of using these convenience variables for
stepping through all the trace snapshots and printing some of their
data.
     (gdb) tfind start
     (gdb) while $trace_frame != -1
     > output $trace_file
     > printf ", line %d (tracepoint #%d)\n", $trace_line, $tracepoint
     > tfind
     > end