huschi.net

FEGETENV(3P)               POSIX Programmer's Manual              FEGETENV(3P)
PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the  corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.
NAME
       fegetenv, fesetenv -- get and set current floating-point environment
SYNOPSIS
       #include <fenv.h>
       int fegetenv(fenv_t *envp);
       int fesetenv(const fenv_t *envp);
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  fegetenv()  function  shall attempt to store the current floating-
       point environment in the object pointed to by envp.
       The fesetenv() function shall attempt to establish  the  floating-point
       environment represented by the object pointed to by envp.  The argument
       envp shall point to an object set by a call to fegetenv() or  feholdex-
       cept(),  or  equal  a  floating-point environment macro. The fesetenv()
       function does not raise floating-point exceptions,  but  only  installs
       the  state  of  the floating-point status flags represented through its
       argument.
RETURN VALUE
       If the representation was successfully stored, fegetenv() shall  return
       zero.  Otherwise, it shall return a non-zero value.  If the environment
       was successfully established, fesetenv() shall return zero.  Otherwise,
       it shall return a non-zero value.
ERRORS
       No errors are defined.
       The following sections are informative.
EXAMPLES
       None.
APPLICATION USAGE
       None.
RATIONALE
       None.
FUTURE DIRECTIONS
       None.
SEE ALSO
       feholdexcept(), feupdateenv()
       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 Technology
       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri-
       cal  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  Standard
       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.ker-
       nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                  2013                         FEGETENV(3P)