FEHOLDEXCEPT(3P)                                    POSIX Programmer's Manual                                   FEHOLDEXCEPT(3P)



PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (con-
       sult 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 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(), fesetenv(), feupdateenv(), the Base Definitions volume of IEEE Std 1003.1-2001, <fenv.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003  Edition,  Standard  for
       Information  Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copy-
       right (C) 2001-2003 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.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                                              FEHOLDEXCEPT(3P)