Copyright (c) 1983 The Regents of the University of California.
 All rights reserved.

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 @(#)sigsetmask.2 6.4 (Berkeley) 05/18/89

 SIGSETMASK 2 ""
C 5 
 NAME
sigsetmask - set current signal mask

 SYNOPSIS
 #include <signal.h> 
 sigsetmask(mask);  int mask; 
 mask = sigmask(signum) 
 DESCRIPTION
 Sigsetmask sets the current signal mask (those signals
that are blocked from delivery).
Signals are blocked if the
corresponding bit in 
 mask is a 1; the macro
 sigmask is provided to construct the mask for a given
 signum . 

The system
quietly disallows SIGKILL, SIGSTOP, or SIGCONT to
be blocked.

 "RETURN VALUE
The previous set of masked signals is returned.

 "SEE ALSO"
kill(2), sigvec(2), sigblock(2), sigpause(2)