FETESTEXCEPT(P) POSIX Programmer's Manual FETESTEXCEPT(P)NAMEfetestexcept - test floating-point exception flags
SYNOPSIS
#include <fenv.h>
int fetestexcept(int excepts);
DESCRIPTION
The fetestexcept() function shall determine which of a specified subset
of the floating-point exception flags are currently set. The excepts
argument specifies the floating-point status flags to be queried.
RETURN VALUE
The fetestexcept() function shall return the value of the bitwise-
inclusive OR of the floating-point exception macros corresponding to
the currently set floating-point exceptions included in excepts.
ERRORS
No errors are defined.
The following sections are informative.
EXAMPLES
The following example calls function f() if an invalid exception is
set, and then function g() if an overflow exception is set:
#include <fenv.h>
/* ... */
{
#pragma STDC FENV_ACCESS ON
int set_excepts;
feclearexcept(FE_INVALID | FE_OVERFLOW);
// maybe raise exceptions
set_excepts = fetestexcept(FE_INVALID | FE_OVERFLOW);
if (set_excepts & FE_INVALID) f();
if (set_excepts & FE_OVERFLOW) g();
/* ... */
}
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSOfeclearexcept() , fegetexceptflag() , feraiseexcept() , the Base Defi‐
nitions 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 .
IEEE/The Open Group 2003 FETESTEXCEPT(P)
