posix man page for fegetround

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 functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here
       and the ISO C standard is unintentional. This volume of POSIX.1-2008 defers to the ISO C standard.

       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 POSIX.1-2008, <fenv.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technol-
       ogy  --	Portable  Operating  System  Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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 Stan-
       dard is the referee document. The original Standard can be obtained online at http://www.unix.org/online.html .

       Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE
/The Open Group						       2013							    FEGETROUND(3P)