NAME    [Toc]    [Back]

     fpgetmask, fpgetround, fpgetsticky,  fpsetmask,  fpsetround,
fpsetsticky -
     IEEE FP mode control

SYNOPSIS    [Toc]    [Back]

     #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    [Toc]    [Back]

     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 containing
 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 history
 bits.

RETURN VALUES    [Toc]    [Back]

     The fpgetround() and fpsetround() functions return the (previous) rounding
 mode.  The fpgetmask(), fpsetmask(), fpgetsticky(),  and
fpsetsticky()
     functions return the (previous) exception mask and exception
history
     bits.

SEE ALSO    [Toc]    [Back]

     sigaction(2)

OpenBSD     3.6                          April      29,      1999