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. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" @(#)sigsetops.3 8.1 (Berkeley) 6/4/93 29.\" $FreeBSD$ 30.\" 31.Dd December 16, 2004 32.Dt SIGSETOPS 3 33.Os 34.Sh NAME 35.Nm sigemptyset , 36.Nm sigfillset , 37.Nm sigaddset , 38.Nm sigdelset , 39.Nm sigismember 40.Nd manipulate signal sets 41.Sh LIBRARY 42.Lb libc 43.Sh SYNOPSIS 44.In signal.h 45.Ft int 46.Fn sigemptyset "sigset_t *set" 47.Ft int 48.Fn sigfillset "sigset_t *set" 49.Ft int 50.Fn sigaddset "sigset_t *set" "int signo" 51.Ft int 52.Fn sigdelset "sigset_t *set" "int signo" 53.Ft int 54.Fn sigismember "const sigset_t *set" "int signo" 55.Sh DESCRIPTION 56These functions manipulate signal sets stored in a 57.Fa sigset_t . 58Either 59.Fn sigemptyset 60or 61.Fn sigfillset 62must be called for every object of type 63.Fa sigset_t 64before any other use of the object. 65.Pp 66The 67.Fn sigemptyset 68function initializes a signal set to be empty. 69.Pp 70The 71.Fn sigfillset 72function initializes a signal set to contain all signals. 73.Pp 74The 75.Fn sigaddset 76function adds the specified signal 77.Fa signo 78to the signal set. 79.Pp 80The 81.Fn sigdelset 82function deletes the specified signal 83.Fa signo 84from the signal set. 85.Pp 86The 87.Fn sigismember 88function returns whether a specified signal 89.Fa signo 90is contained in the signal set. 91.Sh RETURN VALUES 92The 93.Fn sigismember 94function returns 1 95if the signal is a member of the set, 960 otherwise. 97The other functions return 0 upon success. 98A \-1 return value 99indicates an error occurred and the global variable 100.Va errno 101is set to indicate the reason. 102.Sh ERRORS 103These functions could fail if one of the following occurs: 104.Bl -tag -width Er 105.It Bq Er EINVAL 106.Fa signo 107has an invalid value. 108.El 109.Sh SEE ALSO 110.Xr kill 2 , 111.Xr sigaction 2 , 112.Xr sigpending 2 , 113.Xr sigprocmask 2 , 114.Xr sigsuspend 2 115.Sh STANDARDS 116These functions are defined by 117.St -p1003.1-88 . 118