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.\" $FreeBSD$ 34.\" 35.Dd June 4, 1993 36.Dt SIGSETOPS 3 37.Os 38.Sh NAME 39.Nm sigemptyset , 40.Nm sigfillset , 41.Nm sigaddset , 42.Nm sigdelset , 43.Nm sigismember 44.Nd manipulate signal sets 45.Sh SYNOPSIS 46.Fd #include <signal.h> 47.Ft int 48.Fn sigemptyset "sigset_t *set" 49.Ft int 50.Fn sigfillset "sigset_t *set" 51.Ft int 52.Fn sigaddset "sigset_t *set" "int signo" 53.Ft int 54.Fn sigdelset "sigset_t *set" "int signo" 55.Ft int 56.Fn sigismember "const sigset_t *set" "int signo" 57.Sh DESCRIPTION 58These functions manipulate signal sets stored in a 59.Fa sigset_t . 60Either 61.Fn sigemptyset 62or 63.Fn sigfillset 64must be called for every object of type 65.Fa sigset_t 66before any other use of the object. 67.Pp 68The 69.Fn sigemptyset 70function initializes a signal set to be empty. 71.Pp 72The 73.Fn sigfillset 74function initializes a signal set to contain all signals. 75.Pp 76The 77.Fn sigaddset 78function adds the specified signal 79.Fa signo 80to the signal set. 81.Pp 82The 83.Fn sigdelset 84function deletes the specified signal 85.Fa signo 86from the signal set. 87.Pp 88The 89.Fn sigismember 90function returns whether a specified signal 91.Fa signo 92is contained in the signal set. 93.Pp 94These functions 95are provided as macros in the include file <signal.h>. 96Actual functions are available 97if their names are undefined (with #undef 98.Em 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