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. 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.\" @(#)sigsetmask.2 8.1 (Berkeley) 6/2/93 33.\" $FreeBSD$ 34.\" 35.Dd June 2, 1993 36.Dt SIGSETMASK 2 37.Os 38.Sh NAME 39.Nm sigsetmask , 40.Nm sigblock 41.Nd manipulate current signal mask 42.Sh LIBRARY 43.Lb libc 44.Sh SYNOPSIS 45.In signal.h 46.Ft int 47.Fn sigsetmask "int mask" 48.Ft int 49.Fn sigblock "int mask" 50.Ft int 51.Fn sigmask "int signum" 52.Sh DESCRIPTION 53.Bf -symbolic 54This interface is made obsolete by: 55.Ef 56.Xr sigprocmask 2 . 57.Pp 58The 59.Fn sigsetmask 60function 61sets the current signal mask to the specified 62.Fa mask . 63Signals are blocked from delivery if the corresponding bit in 64.Fa mask 65is a 1. 66The 67.Fn sigblock 68function 69adds the signals in the specified 70.Fa mask 71to the current signal mask, 72rather than overwriting it as 73.Fn sigsetmask 74does. 75The macro 76.Fn sigmask 77is provided to construct the mask for a given 78.Fa signum . 79.Pp 80The system 81quietly disallows 82.Dv SIGKILL 83or 84.Dv SIGSTOP 85to be blocked. 86.Sh RETURN VALUES 87The 88.Fn sigblock 89and 90.Fn sigsetmask 91functions 92return the previous set of masked signals. 93.Sh SEE ALSO 94.Xr kill 2 , 95.Xr sigaction 2 , 96.Xr sigprocmask 2 , 97.Xr sigsuspend 2 , 98.Xr sigvec 2 , 99.Xr sigsetops 3 100.Sh HISTORY 101The 102.Fn sigsetmask 103and 104.Fn sigblock 105functions first appeared in 106.Bx 4.2 107and have been deprecated. 108