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.Dd May 8, 2004 26.Dt FEGETROUND 3 27.Os 28.Sh NAME 29.Nm fegetround , 30.Nm fesetround 31.Nd floating-point rounding control 32.Sh LIBRARY 33.Lb libm 34.Sh SYNOPSIS 35.In fenv.h 36.Fd "#pragma STDC FENV_ACCESS ON" 37.Ft int 38.Fn fegetround void 39.Ft int 40.Fn fesetround "int round" 41.Sh DESCRIPTION 42The 43.Fn fegetround 44function determines the current floating-point rounding mode, 45and the 46.Fn fesetround 47function sets the current rounding mode to 48.Fa round . 49The rounding mode is one of 50.Dv FE_TONEAREST , FE_DOWNWARD , FE_UPWARD , 51or 52.Dv FE_TOWARDZERO , 53as described in 54.Xr fenv 3 . 55.Sh RETURN VALUES 56The 57.Fn fegetround 58routine returns the current rounding mode. 59The 60.Fn fesetround 61function returns 0 on success and non-zero otherwise; 62however, the present implementation always succeeds. 63.Sh SEE ALSO 64.Xr fenv 3 , 65.Xr fpgetround 3 , 66.Xr fpsetround 3 67.Sh STANDARDS 68The 69.Fn fegetround 70and 71.Fn fesetround 72functions conform to 73.St -isoC-99 . 74.Sh HISTORY 75These routines first appeared in 76.Fx 5.3 . 77They supersede the non-standard 78.Xr fpgetround 3 79and 80.Xr fpsetround 3 81functions. 82