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.1‐2008 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.1‐2008, <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  Electrical  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.kernel.org/doc/man-pages/reporting_bugs.html .