fbbd9655e5
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
132 lines
3.6 KiB
Groff
132 lines
3.6 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.
|
|
.\"
|
|
.\" @(#)sigprocmask.2 8.1 (Berkeley) 6/4/93
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd May 7, 2010
|
|
.Dt SIGPROCMASK 2
|
|
.Os
|
|
.Sh NAME
|
|
.Nm sigprocmask
|
|
.Nd manipulate current signal mask
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.In signal.h
|
|
.Ft int
|
|
.Fo sigprocmask
|
|
.Fa "int how"
|
|
.Fa "const sigset_t * restrict set"
|
|
.Fa "sigset_t * restrict oset"
|
|
.Fc
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn sigprocmask
|
|
system call examines and/or changes the current signal mask (those signals
|
|
that are blocked from delivery).
|
|
Signals are blocked if they are members of the current signal mask set.
|
|
.Pp
|
|
If
|
|
.Fa set
|
|
is not null, the action of
|
|
.Fn sigprocmask
|
|
depends on the value of the
|
|
.Fa how
|
|
argument.
|
|
The signal mask is changed as a function of the specified
|
|
.Fa set
|
|
and the current mask.
|
|
The function is specified by
|
|
.Fa how
|
|
using one of the following values from
|
|
.In signal.h :
|
|
.Bl -tag -width SIG_UNBLOCK
|
|
.It Dv SIG_BLOCK
|
|
The new mask is the union of the current mask and the specified
|
|
.Fa set .
|
|
.It Dv SIG_UNBLOCK
|
|
The new mask is the intersection of the current mask
|
|
and the complement of the specified
|
|
.Fa set .
|
|
.It Dv SIG_SETMASK
|
|
The current mask is replaced by the specified
|
|
.Fa set .
|
|
.El
|
|
.Pp
|
|
If
|
|
.Fa oset
|
|
is not null, it is set to
|
|
the previous value of the signal mask.
|
|
When
|
|
.Fa set
|
|
is null,
|
|
the value of
|
|
.Fa how
|
|
is insignificant and the mask remains unset
|
|
providing a way to examine the signal mask without modification.
|
|
.Pp
|
|
The system
|
|
quietly disallows
|
|
.Dv SIGKILL
|
|
or
|
|
.Dv SIGSTOP
|
|
to be blocked.
|
|
.Pp
|
|
In threaded applications,
|
|
.Xr pthread_sigmask 3
|
|
must be used instead of
|
|
.Fn sigprocmask .
|
|
.Sh RETURN VALUES
|
|
.Rv -std sigprocmask
|
|
.Sh ERRORS
|
|
The
|
|
.Fn sigprocmask
|
|
system call will fail and the signal mask will be unchanged if one
|
|
of the following occurs:
|
|
.Bl -tag -width Er
|
|
.It Bq Er EINVAL
|
|
The
|
|
.Fa how
|
|
argument
|
|
has a value other than those listed here.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr kill 2 ,
|
|
.Xr sigaction 2 ,
|
|
.Xr sigpending 2 ,
|
|
.Xr sigsuspend 2 ,
|
|
.Xr fpsetmask 3 ,
|
|
.Xr pthread_sigmask 3 ,
|
|
.Xr sigsetops 3
|
|
.Sh STANDARDS
|
|
The
|
|
.Fn sigprocmask
|
|
system call is expected to
|
|
conform to
|
|
.St -p1003.1-90 .
|