2.11BSD/src/man/man2/sigsetmask.2

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.\" Copyright (c) 1983 Regents of the University of California.
.\" All rights reserved.  The Berkeley software License Agreement
.\" specifies the terms and conditions for redistribution.
.\"
.\"	@(#)sigsetmask.2	6.3.1 (2.11BSD) 97/9/3
.\"
.TH SIGSETMASK 2 "September 3, 1997"
.UC 5
.SH NAME
sigsetmask \- set current signal mask
.SH SYNOPSIS
.nf
.B #include <signal.h>

.B omask = sigsetmask(mask);
.B long omask, mask;

.B mask = sigmask(signum)
.B long mask;
.B int signum;
.SH DESCRIPTION
.B This interface is made obsolete by:
.sigprocmask(2).
.sp
.I Sigsetmask
sets the current signal mask (those signals
that are blocked from delivery).
Signals are blocked if the
corresponding bit in 
.I mask
is a 1; the macro
.I sigmask
is provided to construct the mask for a given
.IR signum .
.PP
The system
quietly disallows SIGKILL, SIGSTOP, or SIGCONT to
be blocked.
.SH "RETURN VALUE
The previous set of masked signals is returned.
.SH "SEE ALSO"
kill(2), sigvec(2), sigblock(2), sigpause(2)
.SH HISTORY
The
.B sigsetmask
function call appeared in 4.2BSD and has been deprecated.