$NetBSD: fpgetmask.3,v 1.3 2001/09/16 02:57:03 wiz Exp $
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.Dd $Mdocdate: June 5 2013 $ .Dt FPGETMASK 3 .Os .Sh NAME .Nm fpgetmask , .Nm fpgetround , .Nm fpgetsticky , .Nm fpsetmask , .Nm fpsetround , .Nm fpsetsticky .Nd IEEE FP mode control .Sh SYNOPSIS n ieeefp.h .Ft fp_except .Fn fpgetmask void .Ft fp_rnd .Fn fpgetround void .Ft fp_except .Fn fpgetsticky void .Ft fp_except .Fn fpsetmask "fp_except mask" .Ft fp_rnd .Fn fpsetround "fp_rnd rnd_dir" .Ft fp_except .Fn fpsetsticky "fp_except sticky" .Sh DESCRIPTION A rounding mode is one of .Dv FP_RZ , FP_RM , FP_RN , or .Dv FP_RP , for rounding towards zero, rounding
q Em Minus infinity down, rounding to .Em nearest , and rounding
q Em Plus infinity up. The default mode is .Dv FP_RN .
p An .Ft fp_except value is a bitmask specifying an exception type and containing any of the values listed below. l -column FP_X_UFLxx -offset indent t Dv FP_X_INV Ta Invalid Operation t Dv FP_X_DZ Ta Division by zero t Dv FP_X_OFL Ta Overflow t Dv FP_X_UFL Ta Underflow t Dv FP_X_IMP Ta Imprecision (inexact) t Dv FP_X_DNML Ta Denormalization Pq amd64 and i386 only .El
p The .Fn fpsetmask function will cause future operations with the specified result status to raise the .Dv SIGFPE exception. The .Fn fpsetround function will cause future operations to use the specified dynamic mode. l -tag -width Note:x t Em Note : On some architectures, instructions can optionally specify static rounding modes and exception enables that will supersede the specified dynamic mode. On other architectures, these features may not be fully supported. .El
p The .Fn fpsetsticky function will set or clear the specified exception history bits. .Sh RETURN VALUES The .Fn fpgetround and .Fn fpsetround functions return the
q previous rounding mode. The .Fn fpgetmask , .Fn fpsetmask , .Fn fpgetsticky , and .Fn fpsetsticky functions return the
q previous exception mask and exception history bits. .Sh SEE ALSO .Xr sigaction 2