1.\" Copyright (c) 1983, 1991 The Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" from: @(#)sigblock.2 6.7 (Berkeley) 3/10/91 33.\" $Id: sigblock.3,v 1.5 1994/12/05 18:51:49 jtc Exp $ 34.\" 35.Dd March 10, 1991 36.Dt SIGBLOCK 3 37.Os BSD 4.2 38.Sh NAME 39.Nm sigblock 40.Nd block signals 41.Sh SYNOPSIS 42.Fd #include <signal.h> 43.Ft int 44.Fn sigblock "int mask" 45.Ft int 46.Fn sigmask signum 47.Sh DESCRIPTION 48.Bf -symbolic 49This interface is made obsolete by: 50.Ef 51.Xr sigprocmask 2 . 52.Pp 53.Fn Sigblock 54adds the signals specified in 55.Fa mask 56to the set of signals currently 57being blocked from delivery. 58Signals are blocked if the 59corresponding bit in 60.Fa mask 61is a 1; the macro 62.Fn sigmask 63is provided to construct the mask for a given 64.Fa signum . 65.Pp 66It is not possible to block 67.Dv SIGKILL 68or 69.Dv SIGSTOP ; 70this restriction is silently 71imposed by the system. 72.Sh RETURN VALUES 73The previous set of masked signals is returned. 74.Sh SEE ALSO 75.Xr kill 2 , 76.Xr sigprocmask 2 , 77.Xr sigaction 2 , 78.Xr sigsetmask 2 , 79.Xr sigsetops 3 80.Sh HISTORY 81The 82.Fn sigblock 83function call appeared in 84.Bx 4.2 85and has been deprecated. 86