.\" Copyright (c) 1983 Regents of the University of California.
.\" All rights reserved. The Berkeley software License Agreement
.\" specifies the terms and conditions for redistribution.
.\" @(#)sigblock.2 6.3 (Berkeley) %G%
sigblock \- block signals
.B mask = sigmask(signum)
causes the signals specified in
to be added to the set of signals currently
being blocked from delivery.
Signals are blocked if the
is provided to construct the mask for a given
It is not possible to block SIGKILL,
SIGSTOP, or SIGCONT; this restriction is silently
The previous set of masked signals is returned.
kill(2), sigvec(2), sigsetmask(2)