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.\" 30.Dd June 2, 1993 31.Dt SIGSETMASK 2 32.Os 33.Sh NAME 34.Nm sigsetmask , 35.Nm sigblock 36.Nd manipulate current signal mask 37.Sh LIBRARY 38.Lb libc 39.Sh SYNOPSIS 40.In signal.h 41.Ft int 42.Fn sigsetmask "int mask" 43.Ft int 44.Fn sigblock "int mask" 45.Ft int 46.Fn sigmask "int signum" 47.Sh DESCRIPTION 48.Bf -symbolic 49This interface is made obsolete by: 50.Ef 51.Xr sigprocmask 2 . 52.Pp 53The 54.Fn sigsetmask 55function 56sets the current signal mask to the specified 57.Fa mask . 58Signals are blocked from delivery if the corresponding bit in 59.Fa mask 60is a 1. 61The 62.Fn sigblock 63function 64adds the signals in the specified 65.Fa mask 66to the current signal mask, 67rather than overwriting it as 68.Fn sigsetmask 69does. 70The macro 71.Fn sigmask 72is provided to construct the mask for a given 73.Fa signum . 74.Pp 75The system 76quietly disallows 77.Dv SIGKILL 78or 79.Dv SIGSTOP 80to be blocked. 81.Sh RETURN VALUES 82The 83.Fn sigblock 84and 85.Fn sigsetmask 86functions 87return the previous set of masked signals. 88.Sh SEE ALSO 89.Xr kill 2 , 90.Xr sigaction 2 , 91.Xr sigprocmask 2 , 92.Xr sigsuspend 2 , 93.Xr sigvec 2 , 94.Xr sigsetops 3 95.Sh HISTORY 96The 97.Fn sigsetmask 98and 99.Fn sigblock 100functions first appeared in 101.Bx 4.2 102and have been deprecated. 103