fpsetmask(3)
- NetBSD Manual Pages
FPGETMASK(3) NetBSD Library Functions Manual FPGETMASK(3)
NAME
fpgetmask, fpgetround, fpgetsticky, fpsetmask, fpsetround, fpsetsticky -
IEEE FP mode control
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <ieeefp.h>
fp_except
fpgetmask(void);
fp_rnd
fpgetround(void);
fp_except
fpgetsticky(void);
fp_except
fpsetmask(fp_except mask);
fp_rnd
fpsetround(fp_rnd rnd_dir);
fp_except
fpsetsticky(fp_except sticky);
DESCRIPTION
A rounding mode is one of FP_RZ, FP_RM, FP_RN, or FP_RP, for rounding
towards zero, rounding (Minus infinity) down, rounding to nearest, and
rounding (Plus infinity) up. The default mode is FP_RN.
An fp_except value is a bitmask specifying an exception type and contain-
ing any of the values listed below.
FP_X_INV Invalid Operation
FP_X_DZ Division by zero
FP_X_OFL Overflow
FP_X_UFL Underflow
FP_X_IMP Imprecision (inexact)
FP_X_IOV Integer Overflow
The fpsetmask() function will cause future operations with the specified
result status to raise the SIGFPE exception. The fpsetround() function
will cause future operations to use the specified dynamic mode.
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.
The fpsetsticky() function will set or clear the specified exception his-
tory bits.
RETURN VALUES
The fpgetround() and fpsetround() functions return the (previous) round-
ing mode. The fpgetmask(), fpsetmask(), fpgetsticky(), and fpsetsticky()
functions return the (previous) exception mask and exception history
bits.
SEE ALSO
sigaction(2)
NetBSD 2.0.2 April 29, 1999 NetBSD 2.0.2
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