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.\" @(#)sigsetops.3 8.1 (Berkeley) 6/4/93 29.\" $FreeBSD: src/lib/libc/gen/sigsetops.3,v 1.4.2.3 2003/03/15 15:11:05 trhodes Exp $ 30.\" $DragonFly: src/lib/libc/gen/sigsetops.3,v 1.3 2006/05/26 19:39:36 swildner Exp $ 31.\" 32.Dd June 4, 1993 33.Dt SIGSETOPS 3 34.Os 35.Sh NAME 36.Nm sigemptyset , 37.Nm sigfillset , 38.Nm sigaddset , 39.Nm sigdelset , 40.Nm sigismember 41.Nd manipulate signal sets 42.Sh LIBRARY 43.Lb libc 44.Sh SYNOPSIS 45.In signal.h 46.Ft int 47.Fn sigemptyset "sigset_t *set" 48.Ft int 49.Fn sigfillset "sigset_t *set" 50.Ft int 51.Fn sigaddset "sigset_t *set" "int signo" 52.Ft int 53.Fn sigdelset "sigset_t *set" "int signo" 54.Ft int 55.Fn sigismember "const sigset_t *set" "int signo" 56.Sh DESCRIPTION 57These functions manipulate signal sets stored in a 58.Fa sigset_t . 59Either 60.Fn sigemptyset 61or 62.Fn sigfillset 63must be called for every object of type 64.Fa sigset_t 65before any other use of the object. 66.Pp 67The 68.Fn sigemptyset 69function initializes a signal set to be empty. 70.Pp 71The 72.Fn sigfillset 73function initializes a signal set to contain all signals. 74.Pp 75The 76.Fn sigaddset 77function adds the specified signal 78.Fa signo 79to the signal set. 80.Pp 81The 82.Fn sigdelset 83function deletes the specified signal 84.Fa signo 85from the signal set. 86.Pp 87The 88.Fn sigismember 89function returns whether a specified signal 90.Fa signo 91is contained in the signal set. 92.Pp 93These functions 94are provided as macros in the include file 95.In signal.h . 96Actual functions are available 97if their names are undefined (with 98.Ic #undef Ar name ) . 99.Sh RETURN VALUES 100The 101.Fn sigismember 102function returns 1 103if the signal is a member of the set, 1040 otherwise. 105The other functions return 0. 106.Sh ERRORS 107Currently no errors are detected. 108.Sh SEE ALSO 109.Xr kill 2 , 110.Xr sigaction 2 , 111.Xr sigsuspend 2 112.Sh STANDARDS 113These functions are defined by 114.St -p1003.1-88 . 115