Section: POSIX Programmer's Manual (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.
--- get and set floating-point status flags
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.1-2017 defers to the ISO C standard.
function shall attempt to store an implementation-defined representation
of the states of the floating-point status flags indicated by the argument
in the object pointed to by the argument
function shall attempt to set the floating-point status flags indicated
by the argument
to the states stored in the object pointed to by
The value pointed to by
shall have been set by a previous call to
whose second argument represented at least those floating-point
exceptions represented by the argument
This function does not raise floating-point exceptions, but only sets
the state of the flags.
If the representation was successfully stored,
shall return zero. Otherwise, it shall return a non-zero value. If the
argument is zero or if all the specified exceptions were successfully
shall return zero. Otherwise, it shall return a non-zero value.
No errors are defined.
The following sections are informative.
The Base Definitions volume of POSIX.1-2017,
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
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