fegetenv (3p) - Linux Manuals
fegetenv: get and set current floating-point environment
PROLOGThis 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 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 feholdexcept(), 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 argument.
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.
COPYRIGHTPortions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 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 .
feholdexcept(), feupdateenv(), the Base Definitions volume of IEEE Std 1003.1-2001, <fenv.h>