FEGETEXCEPTFLAG(3P) POSIX Programmer's Manual FEGETEXCEPTFLAG(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.
fegetexceptflag, fesetexceptflag — get and set floating-point status
int fegetexceptflag(fexcept_t *flagp, int excepts);
int fesetexceptflag(const fexcept_t *flagp, 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 fegetexceptflag() function shall attempt to store an implementa‐
tion-defined representation of the states of the floating-point status
flags indicated by the argument excepts in the object pointed to by the
The fesetexceptflag() function shall attempt to set the floating-point
status flags indicated by the argument excepts to the states stored in
the object pointed to by flagp. The value pointed to by flagp shall
have been set by a previous call to fegetexceptflag() whose second
argument represented at least those floating-point exceptions repre‐
sented by the argument excepts. This function does not raise floating-
point exceptions, but only sets the state of the flags.
If the representation was successfully stored, fegetexceptflag() shall
return zero. Otherwise, it shall return a non-zero value. If the
excepts argument is zero or if all the specified exceptions were suc‐
cessfully set, fesetexceptflag() shall return zero. Otherwise, it shall
return a non-zero value.
No errors are defined.
The following sections are informative.
SEE ALSOfeclearexcept(), feraiseexcept(), 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
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IEEE/The Open Group 2013 FEGETEXCEPTFLAG(3P)