12-17-2008
s Stand for
s stand for sticky bit, to stick the
privileges to the subfolders
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LEARN ABOUT OPENSOLARIS
fpgetround
fpgetround(3C) Standard C Library Functions fpgetround(3C)
NAME
fpgetround, fpsetround, fpgetmask, fpsetmask, fpgetsticky, fpsetsticky - IEEE floating-point environment control
SYNOPSIS
#include <ieeefp.h>
fp_rnd fpgetround(void);
fp_rnd fpsetround(fp_rnd rnd_dir);
fp_except fpgetmask(void);
fp_except fpsetmask(fp_except mask);
fp_except fpgetsticky(void);
fp_except fpsetsticky(fp_except sticky);
DESCRIPTION
There are five floating-point exceptions:
o divide-by-zero,
o overflow,
o underflow,
o imprecise (inexact) result, and
o invalid operation.
When a floating-point exception occurs, the corresponding sticky bit is set(1), and if the mask bit is enabled(1), the trap takes place.
These routines let the user change the behavior on occurrence of any of these exceptions, as well as change the rounding mode for floating-
point operations.
The mask argument is formed by the logical OR operation of the following floating-point exception masks:
FP_X_INV /* invalid operation exception */
FP_X_OFL /* overflow exception */
FP_X_UFL /* underflow exception */
FP_X_DZ /* divide-by-zero exception */
FP_X_IMP /* imprecise (loss of precision) */
The following floating-point rounding modes are passed to fpsetround and returned by fpgetround().
FP_RN /* round to nearest representative number */
FP_RP /* round to plus infinity */
FP_RM /* round to minus infinity */
FP_RZ /* round to zero (truncate) */
The default environment is rounding mode set to nearest (FP_RN) and all traps disabled.
The fpsetsticky() function modifies all sticky flags. The fpsetmask() function changes all mask bits. The fpsetmask() function clears the
sticky bit corresponding to any exception being enabled.
RETURN VALUES
The fpgetround() function returns the current rounding mode.
The fpsetround() function sets the rounding mode and returns the previous rounding mode.
The fpgetmask() function returns the current exception masks.
The fpsetmask() function sets the exception masks and returns the previous setting.
The fpgetsticky() function returns the current exception sticky flags.
The fpsetsticky() function sets (clears) the exception sticky flags and returns the previous setting.
USAGE
The C programming language requires truncation (round to zero) for floating point to integral conversions. The current rounding mode has no
effect on these conversions.
The sticky bit must be cleared to recover from the trap and proceed. If the sticky bit is not cleared before the next trap occurs, a
wrong exception type may be signaled.
Individual bits may be examined using the constants defined in <ieeefp.h>.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|MT-Level |MT-Safe |
+-----------------------------+-----------------------------+
SEE ALSO
isnand(3C), attributes(5)
SunOS 5.11 29 Dec 1996 fpgetround(3C)