FEGETENV(3P) POSIX Programmer's Manual FEGETENV(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.
fegetenv, fesetenv — get and set current floating-point environment
int fegetenv(fenv_t *envp);
int fesetenv(const fenv_t *envp);
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 fegetenv() function shall attempt to store the current floating-
point environment in the object pointed to by envp.
The fesetenv() function shall attempt to establish the floating-point
environment represented by the object pointed to by envp. The argument
envp shall point to an object set by a call to fegetenv() or feholdex‐
cept(), or equal a floating-point environment macro. The fesetenv()
function does not raise floating-point exceptions, but only installs
the state of the floating-point status flags represented through its
If the representation was successfully stored, fegetenv() shall return
zero. Otherwise, it shall return a non-zero value. If the environment
was successfully established, fesetenv() shall return zero. Otherwise,
it shall return a non-zero value.
No errors are defined.
The following sections are informative.
SEE ALSOfeholdexcept(), feupdateenv()
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
at http://www.unix.org/online.html .
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IEEE/The Open Group 2013 FEGETENV(3P)