FEGETROUND(3P)						     POSIX Programmer's Manual						    FEGETROUND(3P)

PROLOG

       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

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 Technol-
       ogy -- 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(3P)