FERAISEEXCEPT(3P) POSIX Programmer's Manual FERAISEEXCEPT(3P)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.
NAMEferaiseexcept — raise floating-point exception
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.1‐2008
defers to the ISO C standard.
The feraiseexcept() function shall attempt to raise the supported
floating-point exceptions represented by the argument excepts. The
order in which these floating-point exceptions are raised is unspeci‐
fied. 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 suc‐
cessfully raised, feraiseexcept() shall return zero. Otherwise, it
shall return a non-zero value.
No errors are defined.
The following sections are informative.
The effect is intended to be similar to that of floating-point excep‐
tions raised by arithmetic operations. Hence, enabled traps for float‐
ing-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.
SEE ALSOfeclearexcept(), fegetexceptflag(), fetestexcept()
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 Electri‐
cal 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.ker‐
IEEE/The Open Group 2013 FERAISEEXCEPT(3P)