1.\" $OpenBSD: sigaddset.3,v 1.1 2017/05/29 09:40:02 deraadt Exp $ 2.\" 3.\" Copyright (c) 1983, 1991, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. Neither the name of the University nor the names of its contributors 15.\" may be used to endorse or promote products derived from this software 16.\" without specific prior written permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28.\" SUCH DAMAGE. 29.\" 30.Dd $Mdocdate: May 29 2017 $ 31.Dt SIGADDSET 3 32.Os 33.Sh NAME 34.Nm sigemptyset , 35.Nm sigfillset , 36.Nm sigaddset , 37.Nm sigdelset , 38.Nm sigismember 39.Nd manipulate signal sets 40.Sh SYNOPSIS 41.In signal.h 42.Ft int 43.Fn sigemptyset "sigset_t *set" 44.Ft int 45.Fn sigfillset "sigset_t *set" 46.Ft int 47.Fn sigaddset "sigset_t *set" "int signo" 48.Ft int 49.Fn sigdelset "sigset_t *set" "int signo" 50.Ft int 51.Fn sigismember "const sigset_t *set" "int signo" 52.Sh DESCRIPTION 53These functions manipulate signal sets stored in a 54.Fa sigset_t . 55Either 56.Fn sigemptyset 57or 58.Fn sigfillset 59must be called for every object of type 60.Fa sigset_t 61before any other use of the object. 62.Fn sigemptyset 63and 64.Fn sigfillset 65are provided as macros, but actual functions are available 66if their names are undefined (with #undef 67.Ar name ) . 68.Pp 69The 70.Fn sigemptyset 71function initializes a signal set to be empty. 72.Pp 73.Fn sigfillset 74initializes a signal set to contain all signals. 75.Pp 76.Fn sigaddset 77adds the specified signal 78.Fa signo 79to the signal set. 80.Pp 81.Fn sigdelset 82deletes the specified signal 83.Fa signo 84from the signal set. 85.Pp 86.Fn sigismember 87returns whether a specified signal 88.Fa signo 89is contained in the signal set. 90.Sh RETURN VALUES 91The 92.Fn sigismember 93function returns 1 94if the signal is a member of the set and 0 otherwise. 95The other functions return 0 upon success. 96A \-1 return value 97indicates an error occurred and the global variable 98.Va errno 99is set to indicate the reason. 100.Sh ERRORS 101These functions may fail if one of the following occurs: 102.Bl -tag -width Er 103.It Bq Er EINVAL 104The specified signal 105.Fa signo 106is not a valid signal number. 107.El 108.Sh SEE ALSO 109.Xr kill 2 , 110.Xr sigaction 2 , 111.Xr sigpending 2 , 112.Xr sigprocmask 2 , 113.Xr sigsuspend 2 114.Sh STANDARDS 115These functions are defined by 116.St -p1003.1-90 . 117