This patch imports the unmodified current version of NetBSD libc. The NetBSD includes are in /nbsd_include, while the libc code itself is split between lib/nbsd_libc and common/lib/libc.
119 lines
3.2 KiB
Groff
119 lines
3.2 KiB
Groff
.\" Copyright (c) 1983, 1991, 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" from: @(#)sigblock.2 8.1 (Berkeley) 6/2/93
|
|
.\" $NetBSD: sigblock.3,v 1.17 2003/08/07 16:42:40 agc Exp $
|
|
.\"
|
|
.Dd August 10, 2002
|
|
.Dt SIGBLOCK 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm sigblock
|
|
.Nd block signals
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.In 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 EXAMPLES
|
|
The following example using
|
|
.Fn sigblock :
|
|
.Bd -literal -offset indent
|
|
int omask;
|
|
|
|
omask = sigblock(sigmask(SIGINT) | sigmask(SIGHUP));
|
|
.Ed
|
|
.Pp
|
|
Becomes:
|
|
.Bd -literal -offset indent
|
|
sigset_t set, oset;
|
|
|
|
sigemptyset(&set);
|
|
sigaddset(&set, SIGINT);
|
|
sigaddset(&set, SIGHUP);
|
|
sigprocmask(SIG_BLOCK, &set, &oset);
|
|
.Ed
|
|
.Pp
|
|
Another use of
|
|
.Fn sigblock
|
|
is to get the current set of masked signals without changing what
|
|
is actually blocked.
|
|
Instead of:
|
|
.Bd -literal -offset indent
|
|
int set;
|
|
|
|
set = sigblock(0);
|
|
.Ed
|
|
.Pp
|
|
Use the following:
|
|
.Bd -literal -offset indent
|
|
sigset_t set;
|
|
|
|
sigprocmask(SIG_BLOCK, NULL, &set);
|
|
.Ed
|
|
.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.
|