FEGETENV(3)                POSIX Programmer's Manual               FEGETENV(3)



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

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 .



IEEE/The Open Group                  2017                          FEGETENV(3)
