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.Dd June 2, 1993 29.Dt SIGSETMASK 2 30.Os 31.Sh NAME 32.Nm sigsetmask , 33.Nm sigblock 34.Nd manipulate current signal mask 35.Sh LIBRARY 36.Lb libc 37.Sh SYNOPSIS 38.In signal.h 39.Ft int 40.Fn sigsetmask "int mask" 41.Ft int 42.Fn sigblock "int mask" 43.Ft int 44.Fn sigmask "int signum" 45.Sh DESCRIPTION 46.Bf -symbolic 47This interface is made obsolete by: 48.Ef 49.Xr sigprocmask 2 . 50.Pp 51The 52.Fn sigsetmask 53function 54sets the current signal mask to the specified 55.Fa mask . 56Signals are blocked from delivery if the corresponding bit in 57.Fa mask 58is a 1. 59The 60.Fn sigblock 61function 62adds the signals in the specified 63.Fa mask 64to the current signal mask, 65rather than overwriting it as 66.Fn sigsetmask 67does. 68The macro 69.Fn sigmask 70is provided to construct the mask for a given 71.Fa signum . 72.Pp 73The system 74quietly disallows 75.Dv SIGKILL 76or 77.Dv SIGSTOP 78to be blocked. 79.Sh RETURN VALUES 80The 81.Fn sigblock 82and 83.Fn sigsetmask 84functions 85return the previous set of masked signals. 86.Sh SEE ALSO 87.Xr kill 2 , 88.Xr sigaction 2 , 89.Xr sigprocmask 2 , 90.Xr sigsuspend 2 , 91.Xr sigvec 2 , 92.Xr sigsetops 3 93.Sh HISTORY 94The 95.Fn sigsetmask 96and 97.Fn sigblock 98functions first appeared in 99.Bx 4.2 100and have been deprecated. 101