trace_matches -N "before_fork" "^ust.before_fork:" $trace_loc
trace_matches -N "after_fork_parent" "^ust.after_fork_parent:" $trace_loc
trace_matches -N "after_fork_child" "^ust.after_fork_child:" $trace_loc
trace_matches -N "before_fork" "^ust.before_fork:" $trace_loc
trace_matches -N "after_fork_parent" "^ust.after_fork_parent:" $trace_loc
trace_matches -N "after_fork_child" "^ust.after_fork_child:" $trace_loc