1.\" Copyright (c) 2004 David Schultz <das@FreeBSD.org> 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $FreeBSD$ 26.\" 27.Dd May 8, 2004 28.Dt FEGETROUND 3 29.Os 30.Sh NAME 31.Nm fegetround , 32.Nm fesetround 33.Nd floating-point rounding control 34.Sh LIBRARY 35.Lb libm 36.Sh SYNOPSIS 37.In fenv.h 38.Fd "#pragma STDC FENV_ACCESS ON" 39.Ft int 40.Fn fegetround "void" 41.Ft int 42.Fn fesetround "int round" 43.Sh DESCRIPTION 44The 45.Fn fegetround 46function determines the current floating-point rounding mode, 47and the 48.Fn fesetround 49function sets the current rounding mode to 50.Fa round . 51The rounding mode is one of 52.Dv FE_TONEAREST , 53.Dv FE_DOWNWARD , 54.Dv FE_UPWARD , 55or 56.Dv FE_TOWARDZERO , 57as described in 58.Xr fenv 3 . 59.Sh RETURN VALUES 60The 61.Fn fegetround 62routine returns the current rounding mode. 63The 64.Fn fesetround 65function returns 0 on success and non-zero otherwise; 66however, the present implementation always succeeds. 67.Sh SEE ALSO 68.Xr fenv 3 , 69.Xr fpgetround 3 , 70.Xr fpsetround 3 71.Sh STANDARDS 72The 73.Fn fegetround 74and 75.Fn fesetround 76functions conform to 77.St -isoC-99 . 78.Sh HISTORY 79These routines first appeared in 80.Fx 5.3 . 81They supersede the non-standard 82.Xr fpgetround 3 83and 84.Xr fpsetround 3 85functions. 86