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 BSD 4.2 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.Fd #include <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 58.Fn Sigsetmask 59sets the current signal mask to the specified 60.Fa mask . 61Signals are blocked from delivery if the corresponding bit in 62.Fa mask 63is a 1. 64.Fn Sigblock 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 83.Fn Sigblock 84and 85.Fn sigsetmask 86return the previous set of masked signals. 87.Sh SEE ALSO 88.Xr kill 2 , 89.Xr sigaction 2 , 90.Xr sigprocmask 2 , 91.Xr sigsuspend 2 , 92.Xr sigvec 2 , 93.Xr sigsetops 3 94.Sh HISTORY 95The 96.Fn sigsetmask 97and 98.Fn sigblock 99function calls first appeared in 100.Bx 4.2 101and have been deprecated. 102