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FETESTEXCEPT(3P) POSIX Programmer's Manual FETESTEXCEPT(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.
fetestexcept — test floating-point exception flags
#include <fenv.h>
int fetestexcept(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 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.
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.
No errors are defined.
The following sections are informative.
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();
/* ... */
}
None.
None.
None.
feclearexcept(3p), fegetexceptflag(3p), feraiseexcept(3p)
The Base Definitions volume of POSIX.1‐2008, fenv.h(0p)
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 Electrical 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.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2013 FETESTEXCEPT(3P)
Pages that refer to this page: fenv.h(0p), acos(3p), acosh(3p), asin(3p), asinh(3p), atan2(3p), atan(3p), atanh(3p), ceil(3p), cos(3p), cosh(3p), erf(3p), erfc(3p), exp2(3p), exp(3p), expm1(3p), fdim(3p), feclearexcept(3p), fegetexceptflag(3p), feraiseexcept(3p), floor(3p), fma(3p), fmod(3p), hypot(3p), ilogb(3p), j0(3p), ldexp(3p), lgamma(3p), llrint(3p), llround(3p), log10(3p), log1p(3p), log2(3p), log(3p), logb(3p), lrint(3p), lround(3p), nearbyint(3p), nextafter(3p), pow(3p), remainder(3p), remquo(3p), rint(3p), round(3p), scalbln(3p), sin(3p), sinh(3p), sqrt(3p), tan(3p), tanh(3p), tgamma(3p), y0(3p)