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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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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.1‐2017 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.1‐2017, 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 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)
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HTML rendering created 2024-06-26 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. |
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