freebsd-skq/lib/libc/compat-43/sigsetmask.2
ben 10361fc9ee Merge the documentation for sigsetmask() and sigblock() into a
single manual page, appropriately linked, since this removes the
decision of which page the (previously non-existent) sigmask.2
MLINK should point at.

Submitted by:	will
2001-01-17 19:20:58 +00:00

102 lines
3.0 KiB
Groff

.\" 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
.\" $FreeBSD$
.\"
.Dd June 2, 1993
.Dt SIGSETMASK 2
.Os BSD 4.2
.Sh NAME
.Nm sigsetmask ,
.Nm sigblock
.Nd manipulate current signal mask
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.Fd #include <signal.h>
.Ft int
.Fn sigsetmask "int mask"
.Ft int
.Fn sigblock "int mask"
.Ft int
.Fn sigmask "int signum"
.Sh DESCRIPTION
.Bf -symbolic
This interface is made obsolete by:
.Ef
.Xr sigprocmask 2 .
.Pp
.Fn Sigsetmask
sets the current signal mask to the specified
.Fa mask .
Signals are blocked from delivery if the corresponding bit in
.Fa mask
is a 1.
.Fn Sigblock
adds the signals in the specified
.Fa mask
to the current signal mask,
rather than overwriting it as
.Fn sigsetmask
does.
The macro
.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
.Fn Sigblock
and
.Fn sigsetmask
return the previous set of masked signals.
.Sh SEE ALSO
.Xr kill 2 ,
.Xr sigaction 2 ,
.Xr sigprocmask 2 ,
.Xr sigsuspend 2 ,
.Xr sigvec 2 ,
.Xr sigsetops 3
.Sh HISTORY
The
.Fn sigsetmask
and
.Fn sigblock
function calls first appeared in
.Bx 4.2
and have been deprecated.