This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface

       None.

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard
       for  Information  Technology  --  Portable  Operating  System  Interface  (POSIX),  The  Open  Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 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 .

       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                                   2017                                      FEGETENV(3POSIX)

       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.1‐2017 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
       feholdexcept(), 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.

       No errors are defined.

       Thefollowingsectionsareinformative.

       None.

       None.

       fegetenv, fesetenv — get and set current floating-point environment

       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.

       None.

       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.

feholdexcept(), feupdateenv()

       The Base Definitions volume of POSIX.1‐2017, <fenv.h>

       #include <fenv.h>

       int fegetenv(fenv_t *envp);
       int fesetenv(const fenv_t *envp);