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.
#include <fenv.h> 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.
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 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 successfully set, fesetexceptflag() shall return zero. Otherwise, it shall return a non-zero value.
No errors are defined.
The following sections are informative.
feclearexcept(), feraiseexcept(), fetestexcept()
The Base Definitions volume of POSIX.1-2017, <fenv.h>
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 .
feclearexcept(3p), fenv.h(0p), feraiseexcept(3p), fetestexcept(3p).