bionic (3) feholdexcept.3posix.gz

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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>


       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 .