1.\" $NetBSD: sigsetops.3,v 1.9 2000/06/07 19:47:59 nathanw 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. All advertising materials mentioning features or use of this software 15.\" must display the following acknowledgement: 16.\" This product includes software developed by the University of 17.\" California, Berkeley and its contributors. 18.\" 4. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.\" @(#)sigsetops.3 8.1 (Berkeley) 6/4/93 35.\" 36.Dd June 4, 1993 37.Dt SIGSETOPS 3 38.Os 39.Sh NAME 40.Nm sigemptyset , 41.Nm sigfillset , 42.Nm sigaddset , 43.Nm sigdelset , 44.Nm sigismember 45.Nd manipulate signal sets 46.Sh LIBRARY 47.Lb libc 48.Sh SYNOPSIS 49.Fd #include <signal.h> 50.Ft int 51.Fn sigemptyset "sigset_t *set" 52.Ft int 53.Fn sigfillset "sigset_t *set" 54.Ft int 55.Fn sigaddset "sigset_t *set" "int signo" 56.Ft int 57.Fn sigdelset "sigset_t *set" "int signo" 58.Ft int 59.Fn sigismember "sigset_t *set" "int signo" 60.Sh DESCRIPTION 61These functions manipulate signal sets stored in a 62.Fa sigset_t . 63Either 64.Fn sigemptyset 65or 66.Fn sigfillset 67must be called for every object of type 68.Fa sigset_t 69before any other use of the object. 70.Fn sigemptyset 71and 72.Fn sigfillset 73are provided as macros, but actual functions are available 74if their names are undefined (with #undef 75.Em name ) . 76.Pp 77The 78.Fn sigemptyset 79function initializes a signal set to be empty. 80.Pp 81The 82.Fn sigfillset 83function initializes a signal set to contain all signals. 84.Pp 85The 86.Fn sigaddset 87function adds the specified signal 88.Fa signo 89to the signal set. 90.Pp 91The 92.Fn sigdelset 93function deletes the specified signal 94.Fa signo 95from the signal set. 96.Pp 97The 98.Fn sigismember 99function returns whether a specified signal 100.Fa signo 101is contained in the signal set. 102.Pp 103These functions 104are provided as macros in the include file <signal.h>. 105Actual functions are available 106if their names are undefined (with #undef 107.Em name ) . 108.Sh RETURN VALUES 109The 110.Fn sigismember 111function returns 1 112if the signal is a member of the set, 113a 0 otherwise. 114The other functions return 0 upon success. 115A \-1 return value 116indicates an error occurred and the global variable 117.Va errno 118is set to indicate the reason. 119.Sh ERRORS 120These functions could fail if one of the following occurs: 121.Bl -tag -width Er 122.It Bq Er EINVAL 123.Fa signo 124has an invalid value. 125.El 126.Sh SEE ALSO 127.Xr kill 2 , 128.Xr sigaction 2 , 129.Xr sigsuspend 2 130.Sh STANDARDS 131These functions conform to 132.St -p1003.1-90 . 133