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.
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
implementation-defined representation of the states of the floating-
point status flags indicated by the argument excepts in the object
pointed to by the argument flagp.
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 represented by the argument excepts. This function does
not raise floating-point exceptions, but only sets the state of the
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
successfully set, fesetexceptflag() shall return zero. Otherwise, it
shall return a non-zero value.
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
IEEE/The Open Group 2013 FEGETEXCEPTFLAG(3P)