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.1‐2017 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.

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.1‐2017, <fenv.h>

COPYRIGHT

       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 .