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+.\" 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 
+.B sigblock
+system call adds the signals specified in
+.I mask
+to the set of signals currently being blocked from delivery.
+.PP
+The 
+.B sigsetmask
+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
+.BR siggetmask .
+.PP
+The 
+.B sigmask
+macro is provided to construct the mask for a given
+.IR signum .
+
+.SH "RETURN VALUE"
+.B siggetmask
+returns the current set of masked signals.
+
+.B sigsetmask 
+and
+.B sigblock
+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"
+4.4BSD. These function calls appeared in BSD 4.3 and are deprecated.
+Use the POSIX signal facilities for new programs.
+.SH "SEE ALSO"
+.BR kill (2),
+.BR sigprocmask (2),
+.BR signal (7)