- The address of the signal set (sigset_t) to be implemented
- The actual value to be set for sigset_t (correct?)
- The old address of the signal set (sigset_t)
- Name of the probe point
- Indicates how to change the blocked signals; possible values are SIG_BLOCK=0 (for blocking signals), SIG_UNBLOCK=1 (for unblocking signals), and SIG_SETMASK=2 for setting the signal mask.