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.\" from: @(#)sigsetmask.2 8.1 (Berkeley) 6/2/93 29.\" $NetBSD: sigsetmask.3,v 1.18 2003/08/07 16:42:40 agc Exp $ 30.\" 31.Dd August 10, 2002 32.Dt SIGSETMASK 3 33.Os 34.Sh NAME 35.Nm sigsetmask 36.Nd set current signal mask 37.Sh LIBRARY 38.Lb libc 39.Sh SYNOPSIS 40.In signal.h 41.Ft int 42.Fn sigsetmask "int mask" 43.Fn sigmask signum 44.Sh DESCRIPTION 45.Bf -symbolic 46This interface is made obsolete by: 47.Ef 48.Xr sigprocmask 2 . 49.Pp 50.Fn sigsetmask 51sets the current signal mask 52Signals are blocked from delivery if the 53corresponding bit in 54.Fa mask 55is a 1; the macro 56.Fn sigmask 57is provided to construct the mask for a given 58.Fa signum . 59.Pp 60The system 61quietly disallows 62.Dv SIGKILL 63or 64.Dv SIGSTOP 65to be blocked. 66.Sh RETURN VALUES 67The previous set of masked signals is returned. 68.Sh EXAMPLES 69The following example using 70.Fn sigsetmask : 71.Bd -literal -offset indent 72int omask; 73 74omask = sigblock(sigmask(SIGINT) | sigmask(SIGHUP)); 75 76\&... 77 78sigsetmask(omask & ~(sigmask(SIGINT) | sigmask(SIGHUP))); 79.Ed 80.Pp 81Could be converted literally to: 82.Bd -literal -offset indent 83sigset_t set, oset; 84 85sigemptyset(&set); 86sigaddset(&set, SIGINT); 87sigaddset(&set, SIGHUP); 88sigprocmask(SIG_BLOCK, &set, &oset); 89 90\&... 91 92sigdelset(&oset, SIGINT); 93sigdelset(&oset, SIGHUP); 94sigprocmask(SIG_SETMASK, &oset, NULL); 95.Ed 96.Pp 97Another, clearer, alternative is: 98.Bd -literal -offset indent 99sigset_t set; 100 101sigemptyset(&set); 102sigaddset(&set, SIGINT); 103sigaddset(&set, SIGHUP); 104sigprocmask(SIG_BLOCK, &set, NULL); 105 106\&... 107 108sigprocmask(SIG_UNBLOCK, &set, NULL); 109.Ed 110.Pp 111To completely clear the signal mask using 112.Fn sigsetmask 113one can do: 114.Bd -literal -offset indent 115(void) sigsetmask(0); 116.Ed 117.Pp 118Which can be expressed via 119.Xr sigprocmask 2 120as: 121.Bd -literal -offset indent 122sigset_t eset; 123 124sigemptyset(&eset); 125(void) sigprocmask(SIG_SETMASK, &eset, NULL); 126.Ed 127.Sh SEE ALSO 128.Xr kill 2 , 129.Xr sigaction 2 , 130.Xr sigprocmask 2 , 131.Xr sigsuspend 2 , 132.Xr sigblock 3 , 133.Xr sigsetops 3 , 134.Xr sigvec 3 135.Sh HISTORY 136The 137.Fn sigsetmask 138function call appeared in 139.Bx 4.2 140and has been deprecated. 141