|
HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
|
|
PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
|
|
|
FERAISEEXCEPT(3P) POSIX Programmer's Manual FERAISEEXCEPT(3P)
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.
feraiseexcept — raise floating-point exception
#include <fenv.h>
int feraiseexcept(int excepts);
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 feraiseexcept() function shall attempt to raise the supported
floating-point exceptions represented by the excepts argument. The
order in which these floating-point exceptions are raised is
unspecified, except that if the excepts argument represents IEC
60559 valid coincident floating-point exceptions for atomic
operations (namely overflow and inexact, or underflow and
inexact), then overflow or underflow shall be raised before
inexact. Whether the feraiseexcept() function additionally raises
the inexact floating-point exception whenever it raises the
overflow or underflow floating-point exception is implementation-
defined.
If the argument is zero or if all the specified exceptions were
successfully raised, feraiseexcept() shall return zero. Otherwise,
it shall return a non-zero value.
No errors are defined.
The following sections are informative.
None.
The effect is intended to be similar to that of floating-point
exceptions raised by arithmetic operations. Hence, enabled traps
for floating-point exceptions raised by this function are taken.
Raising overflow or underflow is allowed to also raise inexact
because on some architectures the only practical way to raise an
exception is to execute an instruction that has the exception as a
side-effect. The function is not restricted to accept only valid
coincident expressions for atomic operations, so the function can
be used to raise exceptions accrued over several operations.
None.
feclearexcept(3p), fegetexceptflag(3p), fetestexcept(3p)
The Base Definitions volume of POSIX.1‐2017, fenv.h(0p)
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 FERAISEEXCEPT(3P)
Pages that refer to this page: fenv.h(0p), feclearexcept(3p), fegetexceptflag(3p), fetestexcept(3p)
|
HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
|