2004-11-03 13:51:07 +00:00
|
|
|
.\" Copyright (c) 1983, 1991 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.
|
|
|
|
.\"
|
|
|
|
.\" @(#)sigblock.2 6.7 (Berkeley) 3/10/91
|
|
|
|
.\"
|
|
|
|
.\" Modified Sat Jul 24 10:09:15 1993 by Rik Faith <faith@cs.unc.edu>
|
|
|
|
.\" Modified Fri Aug 11 1995 by Stephen Lee <sl14@cornell.edu>
|
|
|
|
.\" Modified 1995 by Mike Battersby <mib@deakin.edu.au>
|
|
|
|
.\""
|
|
|
|
.TH SIGBLOCK 2 1995-08-31 "Linux 1.3" "Linux Programmer's Manual"
|
|
|
|
.SH NAME
|
|
|
|
sigblock, siggetmask, sigsetmask, sigmask \- manipulate the signal mask
|
|
|
|
.SH SYNOPSIS
|
|
|
|
.B #include <signal.h>
|
|
|
|
.sp
|
|
|
|
.BI "int sigblock(int " mask );
|
|
|
|
.sp
|
|
|
|
.B int siggetmask(void);
|
|
|
|
.sp
|
|
|
|
.BI "int sigsetmask(int " mask );
|
|
|
|
.sp
|
|
|
|
.BI "int sigmask(int " signum );
|
|
|
|
.SH DESCRIPTION
|
|
|
|
This interface is made obsolete by
|
|
|
|
.BR sigprocmask (2).
|
|
|
|
|
|
|
|
The
|
2005-10-19 06:54:38 +00:00
|
|
|
.BR sigblock ()
|
2004-11-03 13:51:07 +00:00
|
|
|
system call adds the signals specified in
|
|
|
|
.I mask
|
|
|
|
to the set of signals currently being blocked from delivery.
|
|
|
|
.PP
|
|
|
|
The
|
2005-10-19 06:54:38 +00:00
|
|
|
.BR sigsetmask ()
|
2004-11-03 13:51:07 +00:00
|
|
|
system call replaces the set of blocked signals totally with a new set
|
|
|
|
specified in
|
|
|
|
.IR mask .
|
|
|
|
Signals are blocked if the corresponding bit in
|
|
|
|
.I mask
|
|
|
|
is a 1.
|
|
|
|
.PP
|
|
|
|
The current set of blocked signals can be obtained using
|
2005-10-19 06:54:38 +00:00
|
|
|
.BR siggetmask ().
|
2004-11-03 13:51:07 +00:00
|
|
|
.PP
|
|
|
|
The
|
2005-10-19 06:54:38 +00:00
|
|
|
.BR sigmask ()
|
2004-11-03 13:51:07 +00:00
|
|
|
macro is provided to construct the mask for a given
|
|
|
|
.IR signum .
|
|
|
|
|
|
|
|
.SH "RETURN VALUE"
|
2005-10-19 06:54:38 +00:00
|
|
|
.BR siggetmask ()
|
2004-11-03 13:51:07 +00:00
|
|
|
returns the current set of masked signals.
|
|
|
|
|
2005-10-19 06:54:38 +00:00
|
|
|
.BR sigsetmask ()
|
2004-11-03 13:51:07 +00:00
|
|
|
and
|
2005-10-19 06:54:38 +00:00
|
|
|
.BR sigblock ()
|
2004-11-03 13:51:07 +00:00
|
|
|
return the previous set of masked signals.
|
|
|
|
.SH NOTES
|
|
|
|
Prototypes for these functions are only available if
|
|
|
|
.B _BSD_SOURCE
|
|
|
|
is defined before the inclusion of any system header file.
|
|
|
|
.PP
|
|
|
|
It is not possible to block
|
|
|
|
.B SIGKILL
|
|
|
|
or
|
|
|
|
.B SIGSTOP
|
|
|
|
\- this restriction is silently imposed by the system.
|
|
|
|
|
|
|
|
.SH "CONFORMING TO"
|
2005-07-18 15:05:56 +00:00
|
|
|
4.4BSD. These function calls appeared in 4.3BSD and are deprecated.
|
2004-11-03 13:51:07 +00:00
|
|
|
Use the POSIX signal facilities for new programs.
|
|
|
|
.SH "SEE ALSO"
|
|
|
|
.BR kill (2),
|
|
|
|
.BR sigprocmask (2),
|
|
|
|
.BR signal (7)
|