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.\" @(#)sigsetops.3 6.2 (Berkeley) 4/19/91 33.\" 34.Dd April 19, 1991 35.Dt SIGSETOPS 3 36.Os 37.Sh NAME 38.Nm sigsetops , 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.Fn sigemptyset "sigset_t *set" 48.Fn sigfillset "sigset_t *set" 49.Fn sigaddset "sigset_t *set" "int signo" 50.Fn sigdelset "sigset_t *set" "int signo" 51.Fn sigismember "sigset_t *set" "int signo" 52.Sh DESCRIPTION 53These functions manipulate signal mask stored in a 54.Fa sigset_t . 55They are provided as macros, but actual functions are available 56if their names are undefined (with #undef 57.Em name ) . 58.Pp 59The 60.Fn sigemptyset 61function initializes a signal set to be empty. 62The 63.Fn sigfillset 64function initializes a signal set to contain all of the known signals. 65One of these routines must be used to initialize a signal set 66before its use by the other functions. 67.Pp 68The 69.Fn sigaddset 70function adds a specified signal 71.Fa signo 72to a signal set. 73The 74.Fn sigdelset 75function deletes a specified signal 76.Fa signo 77from a signal set. 78.Pp 79The 80.Fn sigismember 81function tests whether a specified signal 82.Fa signo 83is contained in a signal set. 84.Sh RETURN VALUES 85The 86.Fn sigismember 87function returnes 1 88if the signal is a member of the set, 89a 0 otherwise. 90The other functions return 0 upon success. 91A \-1 return value 92indicates an error occurred and the global variable 93.Va errno 94is set to indicated the reason. 95The current implementation does not detect any errors. 96.Sh ERRORS 97These functions could fail if one of the following occurs: 98.Bl -tag -width [EINVAL] 99.It Bq Er EINVAL 100.Fa signo 101has an invalid value. 102.El 103.Sh SEE ALSO 104.Xr kill 2 , 105.Xr sigaction 2 , 106.Xr sigsetops 2 , 107.Xr sigsuspend 2 108.Sh STANDARDS 109The 110These functions are defined by 111.St -p1003.1-88 . 112.Sh HISTORY 113These functions are 114.Ud . 115