mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-15 10:17:20 +00:00
130 lines
3.7 KiB
Groff
130 lines
3.7 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. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the University of
|
|
.\" California, Berkeley and its contributors.
|
|
.\" 4. 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 June 4, 1993
|
|
.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.
|
|
.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 sigsetops 3
|
|
.Sh STANDARDS
|
|
The
|
|
.Fn sigprocmask
|
|
system call is expected to
|
|
conform to
|
|
.St -p1003.1-90 .
|