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.\" @(#)sigsetops.3 8.1 (Berkeley) 6/4/93 33.\" $FreeBSD: src/lib/libc/gen/sigsetops.3,v 1.4.2.3 2003/03/15 15:11:05 trhodes Exp $ 34.\" $DragonFly: src/lib/libc/gen/sigsetops.3,v 1.3 2006/05/26 19:39:36 swildner Exp $ 35.\" 36.Dd June 4, 1993 37.Dt SIGSETOPS 3 38.Os 39.Sh NAME 40.Nm sigemptyset , 41.Nm sigfillset , 42.Nm sigaddset , 43.Nm sigdelset , 44.Nm sigismember 45.Nd manipulate signal sets 46.Sh LIBRARY 47.Lb libc 48.Sh SYNOPSIS 49.In signal.h 50.Ft int 51.Fn sigemptyset "sigset_t *set" 52.Ft int 53.Fn sigfillset "sigset_t *set" 54.Ft int 55.Fn sigaddset "sigset_t *set" "int signo" 56.Ft int 57.Fn sigdelset "sigset_t *set" "int signo" 58.Ft int 59.Fn sigismember "const sigset_t *set" "int signo" 60.Sh DESCRIPTION 61These functions manipulate signal sets stored in a 62.Fa sigset_t . 63Either 64.Fn sigemptyset 65or 66.Fn sigfillset 67must be called for every object of type 68.Fa sigset_t 69before any other use of the object. 70.Pp 71The 72.Fn sigemptyset 73function initializes a signal set to be empty. 74.Pp 75The 76.Fn sigfillset 77function initializes a signal set to contain all signals. 78.Pp 79The 80.Fn sigaddset 81function adds the specified signal 82.Fa signo 83to the signal set. 84.Pp 85The 86.Fn sigdelset 87function deletes the specified signal 88.Fa signo 89from the signal set. 90.Pp 91The 92.Fn sigismember 93function returns whether a specified signal 94.Fa signo 95is contained in the signal set. 96.Pp 97These functions 98are provided as macros in the include file 99.In signal.h . 100Actual functions are available 101if their names are undefined (with 102.Ic #undef Ar name ) . 103.Sh RETURN VALUES 104The 105.Fn sigismember 106function returns 1 107if the signal is a member of the set, 1080 otherwise. 109The other functions return 0. 110.Sh ERRORS 111Currently no errors are detected. 112.Sh SEE ALSO 113.Xr kill 2 , 114.Xr sigaction 2 , 115.Xr sigsuspend 2 116.Sh STANDARDS 117These functions are defined by 118.St -p1003.1-88 . 119