trace
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. See 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]
Examples:
(gdb) delete trace 1 2 3 // remove three tracepoints
(gdb) delete trace // remove all tracepoints
You can abbreviate this command as del tr.