freebsd-dev/lib/libc/compat-43/sigsetmask.2

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.\" Copyright (c) 1983, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
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.\" @(#)sigsetmask.2 8.1 (Berkeley) 6/2/93
1999-08-28 00:22:10 +00:00
.\" $FreeBSD$
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.\"
.Dd June 2, 1993
.Dt SIGSETMASK 2
.Os
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.Sh NAME
.Nm sigsetmask ,
.Nm sigblock
.Nd manipulate current signal mask
.Sh LIBRARY
.Lb libc
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.Sh SYNOPSIS
.In signal.h
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.Ft int
.Fn sigsetmask "int mask"
.Ft int
.Fn sigblock "int mask"
.Ft int
.Fn sigmask "int signum"
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.Sh DESCRIPTION
.Bf -symbolic
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This interface is made obsolete by:
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.Ef
.Xr sigprocmask 2 .
.Pp
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The
.Fn sigsetmask
function
sets the current signal mask to the specified
.Fa mask .
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Signals are blocked from delivery if the corresponding bit in
.Fa mask
is a 1.
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The
.Fn sigblock
function
adds the signals in the specified
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.Fa mask
to the current signal mask,
rather than overwriting it as
.Fn sigsetmask
does.
The macro
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.Fn sigmask
is provided to construct the mask for a given
.Fa signum .
.Pp
The system
quietly disallows
.Dv SIGKILL
or
.Dv SIGSTOP
to be blocked.
.Sh RETURN VALUES
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The
.Fn sigblock
and
.Fn sigsetmask
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functions
return the previous set of masked signals.
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.Sh SEE ALSO
.Xr kill 2 ,
.Xr sigaction 2 ,
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.Xr sigprocmask 2 ,
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.Xr sigsuspend 2 ,
.Xr sigvec 2 ,
.Xr sigsetops 3
.Sh HISTORY
The
.Fn sigsetmask
and
.Fn sigblock
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functions first appeared in
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.Bx 4.2
and have been deprecated.