1.\" Copyright (c) 1983, 1991 The Regents of the University of California. 2.\" 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.\" from: @(#)sigsetops.3 6.2 (Berkeley) 4/19/91 33.\" $Id: sigsetops.3,v 1.4 1994/01/10 23:09:09 jtc Exp $ 34.\" 35.Dd April 19, 1991 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 masks 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 "sigset_t *set" "int signo" 57.Sh DESCRIPTION 58These functions manipulate signal mask stored in a 59.Fa sigset_t . 60They are provided as macros, but actual functions are available 61if their names are undefined (with #undef 62.Em name ) . 63.Pp 64The 65.Fn sigemptyset 66function initializes a signal set to be empty. 67The 68.Fn sigfillset 69function initializes a signal set to contain all of the known signals. 70One of these routines must be used to initialize a signal set 71before its use by the other functions. 72.Pp 73The 74.Fn sigaddset 75function adds a specified signal 76.Fa signo 77to a signal set. 78The 79.Fn sigdelset 80function deletes a specified signal 81.Fa signo 82from a signal set. 83.Pp 84The 85.Fn sigismember 86function tests whether a specified signal 87.Fa signo 88is contained in a signal set. 89.Sh RETURN VALUES 90The 91.Fn sigismember 92function returns 1 93if the signal is a member of the set, 94a 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 indicated the reason. 100The current implementation does not detect any errors. 101.Sh ERRORS 102These functions could fail if one of the following occurs: 103.Bl -tag -width Er 104.It Bq Er EINVAL 105.Fa signo 106has an invalid value. 107.El 108.Sh SEE ALSO 109.Xr kill 2 , 110.Xr sigaction 2 , 111.Xr sigsetops 2 , 112.Xr sigsuspend 2 113.Sh STANDARDS 114These functions are defined by 115.St -p1003.1-90 . 116.Sh HISTORY 117These functions are 118.Ud . 119