129 lines
3.7 KiB
Groff
129 lines
3.7 KiB
Groff
.\" $NetBSD: sigsetops.3,v 1.11 2001/11/23 18:30:11 jdolecek Exp $
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.\"
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.\" Copyright (c) 1983, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)sigsetops.3 8.1 (Berkeley) 6/4/93
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.\"
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.Dd June 4, 1993
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.Dt SIGSETOPS 3
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.Os
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.Sh NAME
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.Nm sigemptyset ,
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.Nm sigfillset ,
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.Nm sigaddset ,
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.Nm sigdelset ,
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.Nm sigismember
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.Nd manipulate signal sets
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.Fd #include <signal.h>
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.Ft int
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.Fn sigemptyset "sigset_t *set"
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.Ft int
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.Fn sigfillset "sigset_t *set"
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.Ft int
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.Fn sigaddset "sigset_t *set" "int signo"
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.Ft int
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.Fn sigdelset "sigset_t *set" "int signo"
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.Ft int
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.Fn sigismember "sigset_t *set" "int signo"
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.Sh DESCRIPTION
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These functions manipulate signal sets stored in a
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.Fa sigset_t .
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Either
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.Fn sigemptyset
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or
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.Fn sigfillset
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must be called for every object of type
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.Fa sigset_t
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before any other use of the object.
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.Pp
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The
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.Fn sigemptyset
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function initializes a signal set to be empty.
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.Pp
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The
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.Fn sigfillset
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function initializes a signal set to contain all signals.
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.Pp
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The
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.Fn sigaddset
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function adds the specified signal
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.Fa signo
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to the signal set.
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.Pp
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The
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.Fn sigdelset
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function deletes the specified signal
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.Fa signo
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from the signal set.
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.Pp
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The
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.Fn sigismember
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function returns whether a specified signal
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.Fa signo
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is contained in the signal set.
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.Pp
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.Fn sigemptyset
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and
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.Fn sigfillset
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are provided as macros, but actual functions are available
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if their names are undefined (with #undef
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.Em name ) .
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.Sh RETURN VALUES
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The
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.Fn sigismember
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function returns 1
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if the signal is a member of the set,
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a 0 otherwise.
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The other functions return 0 upon success.
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A \-1 return value
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indicates an error occurred and the global variable
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.Va errno
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is set to indicate the reason.
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.Sh ERRORS
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These functions could fail if one of the following occurs:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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.Fa signo
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has an invalid value.
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.El
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.Sh SEE ALSO
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.Xr kill 2 ,
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.Xr sigaction 2 ,
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.Xr sigsuspend 2 ,
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.Xr signal 7
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.Sh STANDARDS
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These functions conform to
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.St -p1003.1-90 .
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