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.\" 34.Dd June 4, 1993 35.Dt SIGSETOPS 3 36.Os 37.Sh NAME 38.Nm sigemptyset , 39.Nm sigfillset , 40.Nm sigaddset , 41.Nm sigdelset , 42.Nm sigismember 43.Nd manipulate signal sets 44.Sh SYNOPSIS 45.Fd #include <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 <signal.h>. 95Actual functions are available 96if their names are undefined (with #undef 97.Em name ) . 98.Sh RETURN VALUES 99The 100.Fn sigismember 101function returns 1 102if the signal is a member of the set, 1030 otherwise. 104The other functions return 0. 105.Sh ERRORS 106Currently no errors are detected. 107.Sh SEE ALSO 108.Xr kill 2 , 109.Xr sigaction 2 , 110.Xr sigsuspend 2 111.Sh STANDARDS 112These functions are defined by 113.St -p1003.1-88 . 114