86 lines
2.4 KiB
Groff
86 lines
2.4 KiB
Groff
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.\" Copyright (c) 2004 David Schultz <das@FreeBSD.org>
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.\" 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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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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.\" $FreeBSD$
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.\"
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.Dd May 8, 2004
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.Dt FEGETROUND 3
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.Os
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.Sh NAME
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.Nm fegetround ,
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.Nm fesetround
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.Nd floating-point rounding control
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.Sh LIBRARY
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.Lb libm
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.Sh SYNOPSIS
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.In fenv.h
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.Fd "#pragma STDC FENV_ACCESS ON"
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.Ft int
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.Fn fegetround "void"
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.Ft int
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.Fn fesetround "int round"
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.Sh DESCRIPTION
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The
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.Fn fegetround
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function determines the current floating-point rounding mode,
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and the
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.Fn fesetround
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function sets the current rounding mode to
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.Fa round .
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The rounding mode is one of
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.Dv FE_TONEAREST ,
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.Dv FE_DOWNWARD ,
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.Dv FE_UPWARD ,
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or
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.Dv FE_TOWARDZERO ,
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as described in
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.Xr fenv 3 .
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.Sh RETURN VALUES
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The
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.Fn fegetround
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routine returns the current rounding mode.
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The
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.Fn fesetround
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function returns 0 on success and non-zero otherwise;
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however, the present implementation always succeeds.
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.Sh SEE ALSO
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.Xr fenv 3 ,
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.Xr fpgetround 3 ,
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.Xr fpsetround 3
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.Sh STANDARDS
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The
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.Fn fegetround
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and
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.Fn fesetround
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functions conform to
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.St -isoC-99 .
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.Sh HISTORY
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These routines first appeared in
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.Fx 5.3 .
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They supersede the non-standard
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.Xr fpgetround 3
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and
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.Xr fpsetround 3
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functions.
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