NAME
feraiseexcept - raise floating-point exception
SYNOPSIS
#include <fenv.h>
int feraiseexcept(int excepts);
DESCRIPTION
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
unspecified. Whether the feraiseexcept() function additionally raises
the inexact floating-point exception whenever it raises the overflow or
underflow floating-point exception is implementation-defined.
RETURN VALUE
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.
ERRORS
No errors are defined.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
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.
RATIONALE
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.
FUTURE DIRECTIONS
None.
SEE ALSO
feclearexcept() , fegetexceptflag() , fesetexceptflag() ,
fetestexcept() , 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, Copyright (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.opengroup.org/unix/online.html .