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

       feholdexcept — save current floating-point environment

SYNOPSIS

       #include <fenv.h>

       int feholdexcept(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 feholdexcept() function shall save the current floating-point environment in the object pointed to by
       envp,  clear  the  floating-point  status  flags, and then install a non-stop (continue on floating-point
       exceptions) mode, if available, for all floating-point exceptions.

RETURN VALUE

       The feholdexcept() function shall return zero if and only if non-stop floating-point  exception  handling
       was successfully installed.

ERRORS

       No errors are defined.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       The  feholdexcept() function should be effective on typical IEC 60559:1989 standard implementations which
       have the default non-stop mode and at least one  other  mode  for  trap  handling  or  aborting.  If  the
       implementation provides only the non-stop mode, then installing the non-stop mode is trivial.

FUTURE DIRECTIONS

       None.

SEE ALSO

       fegetenv(), 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                                  FEHOLDEXCEPT(3POSIX)