minix/lib/nbsd_libc/gen/sigsetops.3
Gianluca Guida b6cbf7203b Import unmodified NetBSD libc in trunk
This patch imports the unmodified current version of NetBSD libc.
The NetBSD includes are in /nbsd_include, while the libc code itself is 
split between lib/nbsd_libc and common/lib/libc.
2011-02-14 19:36:03 +00:00

124 lines
3.4 KiB
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.\" $NetBSD: sigsetops.3,v 1.14 2003/08/07 16:42:57 agc Exp $
.\"
.\" Copyright (c) 1983, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
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.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
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.\" 3. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
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.\"
.\" @(#)sigsetops.3 8.1 (Berkeley) 6/4/93
.\"
.Dd June 4, 1993
.Dt SIGSETOPS 3
.Os
.Sh NAME
.Nm sigemptyset ,
.Nm sigfillset ,
.Nm sigaddset ,
.Nm sigdelset ,
.Nm sigismember
.Nd manipulate signal sets
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In signal.h
.Ft int
.Fn sigemptyset "sigset_t *set"
.Ft int
.Fn sigfillset "sigset_t *set"
.Ft int
.Fn sigaddset "sigset_t *set" "int signo"
.Ft int
.Fn sigdelset "sigset_t *set" "int signo"
.Ft int
.Fn sigismember "sigset_t *set" "int signo"
.Sh DESCRIPTION
These functions manipulate signal sets stored in a
.Fa sigset_t .
Either
.Fn sigemptyset
or
.Fn sigfillset
must be called for every object of type
.Fa sigset_t
before any other use of the object.
.Pp
The
.Fn sigemptyset
function initializes a signal set to be empty.
.Pp
The
.Fn sigfillset
function initializes a signal set to contain all signals.
.Pp
The
.Fn sigaddset
function adds the specified signal
.Fa signo
to the signal set.
.Pp
The
.Fn sigdelset
function deletes the specified signal
.Fa signo
from the signal set.
.Pp
The
.Fn sigismember
function returns whether a specified signal
.Fa signo
is contained in the signal set.
.Pp
.Fn sigemptyset
and
.Fn sigfillset
are provided as macros, but actual functions are available
if their names are undefined (with #undef
.Em name ) .
.Sh RETURN VALUES
The
.Fn sigismember
function returns 1
if the signal is a member of the set,
a 0 otherwise.
The other functions return 0 upon success.
A \-1 return value
indicates an error occurred and the global variable
.Va errno
is set to indicate the reason.
.Sh ERRORS
These functions could fail if one of the following occurs:
.Bl -tag -width Er
.It Bq Er EINVAL
.Fa signo
has an invalid value.
.El
.Sh SEE ALSO
.Xr kill 2 ,
.Xr sigaction 2 ,
.Xr sigsuspend 2 ,
.Xr signal 7
.Sh STANDARDS
These functions conform to
.St -p1003.1-90 .