.\"	$OpenBSD: feenableexcept.3,v 1.2 2011/05/26 15:42:27 jmc Exp $
.\"
.\" Copyright (c) 2011 Martynas Venckus <martynas@openbsd.org>
.\"
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.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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.Dd $Mdocdate: May 26 2011 $
.Dt FEENABLEEXCEPT 3
.Os
.Sh NAME
.Nm feenableexcept ,
.Nm fedisableexcept ,
.Nm fegetexcept
.Nd control floating-point exception masks
.Sh SYNOPSIS
.Fd #include <fenv.h>
.Ft int
.Fn feenableexcept "int excepts"
.Ft int
.Fn fedisableexcept "int excepts"
.Ft int
.Fn fegetexcept void
.Sh DESCRIPTION
These functions provide control of the floating-point exception
masks.
The
.Fa excepts
input argument is a bitmask specifying an exception type and
containing any of the values listed in
.Xr feclearexcept 3 .
.Pp
The
.Fn feenableexcept
function unmasks the floating-point exceptions represented by
.Fa excepts .
The future floating-point operations that produce
.Fa excepts
will trap, and a
.Dv SIGFPE
will be delivered to the process.
.Pp
The
.Fn fedisableexcept
function masks the floating-point exceptions represented by
.Fa excepts .
All exceptions are masked by default.
.Pp
The
.Fn fegetexcept
function returns the current exception mask.
.Sh RETURN VALUES
The
.Fn feenableexcept ,
and
.Fn fedisableexcept
functions return the previous exception mask.
The
.Fn fegetexcept
function returns the current exception mask.
.Sh SEE ALSO
.Xr sigaction 2 ,
.Xr feclearexcept 3 ,
.Xr fegetenv 3 ,
.Xr fegetround 3
.Sh STANDARDS
The
.Fn feenableexcept ,
.Fn fedisableexcept ,
and
.Fn fegetexcept
functions are
.Ox
extensions.
.Sh HISTORY
These functions first appeared in
.Ox 5.0 .