FEHOLDEXCEPT
Section: POSIX Programmer's Manual (3P)
Updated: 2017
Index
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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 floatin-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 floatin-point environment in the
object pointed to by
envp,
clear the floatin-point status flags, and then install a no-stop
(continue on floatin-point exceptions) mode, if available, for all
floatin-point exceptions.
RETURN VALUE
The
feholdexcept()
function shall return zero if and only if no-stop floatin-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 no-stop mode and at least one other mode for trap
handling or aborting. If the implementation provides only the no-stop
mode, then installing the no-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.-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/ma-pages/reporting_bugs.html .
Index
- PROLOG
-
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- EXAMPLES
-
- APPLICATION USAGE
-
- RATIONALE
-
- FUTURE DIRECTIONS
-
- SEE ALSO
-
- COPYRIGHT
-
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