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 1.5 1994/08/12 05:01:23 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 . 60.Fn sigemptyset 61and 62.Fn sigfillset 63are provided as macros, but actual functions are available 64if their names are undefined (with #undef 65.Em name ) . 66.Pp 67The 68.Fn sigemptyset 69function initializes a signal set to be empty. 70The 71.Fn sigfillset 72function initializes a signal set to contain all of the known signals. 73One of these routines must be used to initialize a signal set 74before its use by the other functions. 75.Pp 76The 77.Fn sigaddset 78function adds a specified signal 79.Fa signo 80to a signal set. 81The 82.Fn sigdelset 83function deletes a specified signal 84.Fa signo 85from a signal set. 86.Pp 87The 88.Fn sigismember 89function tests whether a specified signal 90.Fa signo 91is contained in a signal set. 92.Sh RETURN VALUES 93The 94.Fn sigismember 95function returns 1 96if the signal is a member of the set, 97a 0 otherwise. 98The other functions return 0 upon success. 99A \-1 return value 100indicates an error occurred and the global variable 101.Va errno 102is set to indicated the reason. 103.Sh ERRORS 104These functions could fail if one of the following occurs: 105.Bl -tag -width Er 106.It Bq Er EINVAL 107.Fa signo 108has an invalid value. 109.El 110.Sh SEE ALSO 111.Xr kill 2 , 112.Xr sigaction 2 , 113.Xr sigsetops 2 , 114.Xr sigsuspend 2 115.Sh STANDARDS 116These functions are defined by 117.St -p1003.1-90 . 118