NAME

       fegetround, fesetround - get and set current rounding direction

SYNOPSIS

       #include <fenv.h>

       int fegetround(void);
       int fesetround(int round);

DESCRIPTION

       The fegetround() function shall get the current rounding direction.

       The  fesetround()  function  shall  establish  the  rounding  direction represented by its
       argument round. If the argument is not equal to the value of a rounding  direction  macro,
       the rounding direction is not changed.

RETURN VALUE

       The  fegetround()  function  shall  return  the  value  of  the  rounding  direction macro
       representing the current rounding direction or a  negative  value  if  there  is  no  such
       rounding direction macro or the current rounding direction is not determinable.

       The  fesetround() function shall return a zero value if and only if the requested rounding
       direction was established.

ERRORS

       No errors are defined.

       The following sections are informative.

EXAMPLES

       The following example saves, sets, and restores the rounding direction, reporting an error
       and aborting if setting the rounding direction fails:

              #include <fenv.h>
              #include <assert.h>
              void f(int round_dir)
              {
                  #pragma STDC FENV_ACCESS ON
                  int save_round;
                  int setround_ok;
                  save_round = fegetround();
                  setround_ok = fesetround(round_dir);
                  assert(setround_ok == 0);
                  /* ... */
                  fesetround(save_round);
                  /* ... */
              }

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       The Base Definitions volume of IEEE Std 1003.1-2001, <fenv.h>

COPYRIGHT

       Portions  of  this  text  are  reprinted  and  reproduced in electronic form from IEEE Std
       1003.1, 2003 Edition, Standard for Information Technology  --  Portable  Operating  System
       Interface  (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by
       the Institute of Electrical and Electronics Engineers, Inc and  The  Open  Group.  In  the
       event  of  any  discrepancy  between this version and the original IEEE and The Open Group
       Standard, the original IEEE and The Open Group  Standard  is  the  referee  document.  The
       original Standard can be obtained online at http://www.opengroup.org/unix/online.html .