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 December 16, 2004 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 LIBRARY 46.Lb libc 47.Sh SYNOPSIS 48.In signal.h 49.Ft int 50.Fn sigemptyset "sigset_t *set" 51.Ft int 52.Fn sigfillset "sigset_t *set" 53.Ft int 54.Fn sigaddset "sigset_t *set" "int signo" 55.Ft int 56.Fn sigdelset "sigset_t *set" "int signo" 57.Ft int 58.Fn sigismember "const sigset_t *set" "int signo" 59.Sh DESCRIPTION 60These functions manipulate signal sets stored in a 61.Fa sigset_t . 62Either 63.Fn sigemptyset 64or 65.Fn sigfillset 66must be called for every object of type 67.Fa sigset_t 68before any other use of the object. 69.Pp 70The 71.Fn sigemptyset 72function initializes a signal set to be empty. 73.Pp 74The 75.Fn sigfillset 76function initializes a signal set to contain all signals. 77.Pp 78The 79.Fn sigaddset 80function adds the specified signal 81.Fa signo 82to the signal set. 83.Pp 84The 85.Fn sigdelset 86function deletes the specified signal 87.Fa signo 88from the signal set. 89.Pp 90The 91.Fn sigismember 92function returns whether a specified signal 93.Fa signo 94is contained in the signal set. 95.Sh RETURN VALUES 96The 97.Fn sigismember 98function returns 1 99if the signal is a member of the set, 1000 otherwise. 101The other functions return 0 upon success. 102A \-1 return value 103indicates an error occurred and the global variable 104.Va errno 105is set to indicate the reason. 106.Sh ERRORS 107These functions could fail if one of the following occurs: 108.Bl -tag -width Er 109.It Bq Er EINVAL 110.Fa signo 111has an invalid value. 112.El 113.Sh SEE ALSO 114.Xr kill 2 , 115.Xr sigaction 2 , 116.Xr sigpending 2 , 117.Xr sigprocmask 2 , 118.Xr sigsuspend 2 119.Sh STANDARDS 120These functions are defined by 121.St -p1003.1-88 . 122