Provided by: systemtap-doc_2.9-2ubuntu2_all 

NAME
probe::signal.procmask - Examining or changing blocked signals
SYNOPSIS
signal.procmask
VALUES
oldsigset_addr
The old address of the signal set (sigset_t)
name
Name of the probe point
sigset
The actual value to be set for sigset_t (correct?)
how
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.
sigset_addr
The address of the signal set (sigset_t) to be implemented
SEE ALSO
tapset::signal(3stap)
SystemTap Tapset Reference April 2016 PROBE::SIGNAL.PROC(3stap)