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-.\" Copyright (c) 2004 David Schultz <das@FreeBSD.org>
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    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
-.\"    documentation and/or other materials provided with the distribution.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\" $FreeBSD: src/lib/msun/man/fegetenv.3,v 1.1 2004/06/06 10:06:26 das Exp $
-.\"
-.Dd May 8, 2004
-.Dt FEGETENV 3
-.Os
-.Sh NAME
-.Nm fegetenv ,
-.Nm feholdexcept ,
-.Nm fesetenv ,
-.Nm feupdateenv
-.Nd floating-point environment save and restore
-.Sh LIBRARY
-.Lb libm
-.Sh SYNOPSIS
-.In fenv.h
-.Fd "#pragma STDC FENV_ACCESS ON"
-.Ft int
-.Fn fegetenv "fenv_t *envp"
-.Ft int
-.Fn feholdexcept "fenv_t *envp"
-.Ft int
-.Fn fesetenv "const fenv_t *envp"
-.Ft int
-.Fn feupdateenv "const fenv_t *envp"
-.Sh DESCRIPTION
-The floating-point environment includes exception flags and masks, the
-current rounding mode, and other architecture-specific settings.
-However, it does not include the floating-point register file.
-.Pp
-The
-.Fn fegetenv
-function stores the current floating-point environment in the object
-pointed to by
-.Fa envp ,
-whereas
-.Fn feholdexcept
-saves the current environment, then clears all exception flags
-and masks all floating-point exceptions.
-.Pp
-The
-.Fn fesetenv
-function restores a previously saved environment.
-The
-.Fn feupdateenv
-function restores a saved environment as well, but it also
-raises any exceptions that were set in the environment it
-replaces.
-.Pp
-The
-.Fn feholdexcept
-function is often used with
-.Fn feupdateenv
-or
-.Fn fesetenv
-to suppress spurious exceptions that occur as a result of
-intermediate computations.
-An example in
-.Xr fenv 3
-demonstrates how to do this.
-.Sh RETURN VALUES
-The
-.Fn fegetenv ,
-.Fn feholdexcept ,
-.Fn fesetenv ,
-and
-.Fn feupdateenv
-functions return 0 if they succeed, and non-zero otherwise.
-.Sh SEE ALSO
-.Xr feclearexcept 3 ,
-.Xr fenv 3 ,
-.Xr feraiseexcept 3 ,
-.Xr fesetenv 3 ,
-.Xr fetestexcept 3 ,
-.Xr fpgetmask 3 ,
-.Xr fpgetprec 3 ,
-.Xr fpsetmask 3 ,
-.Xr fpsetprec 3
-.Sh STANDARDS
-The
-.Fn fegetenv ,
-.Fn feholdexcept ,
-.Fn fesetenv ,
-and
-.Fn feupdateenv
-functions conform to
-.St -isoC-99 .
-.Sh HISTORY
-These routines first appeared in
-.Fx 5.3 .