1.\" Copyright (c) 1983, 1991, 1993 2.\" The Regents of the University of California. 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. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" @(#)sigsetmask.2 8.1 (Berkeley) 6/2/93 29.\" $FreeBSD$ 30.\" 31.Dd June 2, 1993 32.Dt SIGSETMASK 2 33.Os 34.Sh NAME 35.Nm sigsetmask , 36.Nm sigblock 37.Nd manipulate current signal mask 38.Sh LIBRARY 39.Lb libc 40.Sh SYNOPSIS 41.In signal.h 42.Ft int 43.Fn sigsetmask "int mask" 44.Ft int 45.Fn sigblock "int mask" 46.Ft int 47.Fn sigmask "int signum" 48.Sh DESCRIPTION 49.Bf -symbolic 50This interface is made obsolete by: 51.Ef 52.Xr sigprocmask 2 . 53.Pp 54The 55.Fn sigsetmask 56function 57sets the current signal mask to the specified 58.Fa mask . 59Signals are blocked from delivery if the corresponding bit in 60.Fa mask 61is a 1. 62The 63.Fn sigblock 64function 65adds the signals in the specified 66.Fa mask 67to the current signal mask, 68rather than overwriting it as 69.Fn sigsetmask 70does. 71The macro 72.Fn sigmask 73is provided to construct the mask for a given 74.Fa signum . 75.Pp 76The system 77quietly disallows 78.Dv SIGKILL 79or 80.Dv SIGSTOP 81to be blocked. 82.Sh RETURN VALUES 83The 84.Fn sigblock 85and 86.Fn sigsetmask 87functions 88return the previous set of masked signals. 89.Sh SEE ALSO 90.Xr kill 2 , 91.Xr sigaction 2 , 92.Xr sigprocmask 2 , 93.Xr sigsuspend 2 , 94.Xr sigvec 2 , 95.Xr sigsetops 3 96.Sh HISTORY 97The 98.Fn sigsetmask 99and 100.Fn sigblock 101functions first appeared in 102.Bx 4.2 103and have been deprecated. 104