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File: [cvs.NetBSD.org] / src / lib / libc / compat-43 / sigblock.3 (download)

Revision 1.6, Mon May 12 07:41:29 1997 UTC (23 years, 2 months ago) by mikel
Branch: MAIN
CVS Tags: netbsd-1-3-base, netbsd-1-3-RELEASE, netbsd-1-3-PATCH003-CANDIDATE2, netbsd-1-3-PATCH003-CANDIDATE1, netbsd-1-3-PATCH003-CANDIDATE0, netbsd-1-3-PATCH003, netbsd-1-3-PATCH002, netbsd-1-3-PATCH001, netbsd-1-3-BETA, netbsd-1-3
Changes since 1.5: +4 -4 lines

xref sigsetmask(3) not sigsetmask(2), and RCSid police.

.\" Copyright (c) 1983, 1991 The Regents of the University of California.
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.\"     from: @(#)sigblock.2	6.7 (Berkeley) 3/10/91
.\"	$NetBSD: sigblock.3,v 1.6 1997/05/12 07:41:29 mikel Exp $
.\"
.Dd March 10, 1991
.Dt SIGBLOCK 3
.Os BSD 4.2
.Sh NAME
.Nm sigblock
.Nd block signals
.Sh SYNOPSIS
.Fd #include <signal.h>
.Ft int
.Fn sigblock "int mask"
.Ft int
.Fn sigmask signum
.Sh DESCRIPTION
.Bf -symbolic
This interface is made obsolete by:
.Xr sigprocmask 2 .
.Ef
.Pp
.Fn Sigblock
adds the signals specified in
.Fa mask
to the set of signals currently
being blocked from delivery.
Signals are blocked if the
corresponding bit in 
.Fa mask
is a 1; the macro
.Fn sigmask
is provided to construct the mask for a given
.Fa signum .
.Pp
It is not possible to block
.Dv SIGKILL
or
.Dv SIGSTOP ;
this restriction is silently
imposed by the system.
.Sh RETURN VALUES
The previous set of masked signals is returned.
.Sh SEE ALSO
.Xr kill 2 ,
.Xr sigaction 2 ,
.Xr sigprocmask 2 ,
.Xr sigsetmask 3 ,
.Xr sigsetops 3
.Sh HISTORY
The
.Fn sigblock
function call appeared in
.Bx 4.2
and has been deprecated.