NetBSD/lib/libc/gen/sigsetops.3

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.\"     from: @(#)sigsetops.3	6.2 (Berkeley) 4/19/91
.\"	$Id: sigsetops.3,v 1.5 1994/08/12 05:01:23 jtc Exp $
.\"
.Dd April 19, 1991
.Dt SIGSETOPS 3
.Os
.Sh NAME
.Nm sigemptyset ,
.Nm sigfillset ,
.Nm sigaddset ,
.Nm sigdelset ,
.Nm sigismember
.Nd manipulate signal masks
.Sh SYNOPSIS
.Fd #include <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 mask stored in a
.Fa sigset_t .
.Fn sigemptyset 
and
.Fn sigfillset 
are provided as macros, but actual functions are available
if their names are undefined (with #undef
.Em name ) .
.Pp
The
.Fn sigemptyset
function initializes a signal set to be empty.
The
.Fn sigfillset
function initializes a signal set to contain all of the known signals.
One of these routines must be used to initialize a signal set
before its use by the other functions.
.Pp
The
.Fn sigaddset
function adds a specified signal
.Fa signo
to a signal set.
The
.Fn sigdelset
function deletes a specified signal
.Fa signo
from a signal set.
.Pp
The
.Fn sigismember
function tests whether a specified signal
.Fa signo
is contained in a signal set.
.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 indicated 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 sigsetops 2 ,
.Xr sigsuspend 2
.Sh STANDARDS
These functions are defined by
.St -p1003.1-90 .