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 .

IEEE/The Open Group                                   2003                                         FEGETROUND(P)