Linux 2.6 - man page for feupdateenv (linux section 3posix)
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FEUPDATEENV(P) POSIX Programmer's Manual FEUPDATEENV(P)
feupdateenv - update floating-point environment
int feupdateenv(const fenv_t *envp);
The feupdateenv() function shall attempt to save the currently raised floating-point
exceptions in its automatic storage, attempt to install the floating-point environment
represented by the object pointed to by envp, and then attempt to raise the saved float-
ing-point exceptions. The argument envp shall point to an object set by a call to fehold-
except() or fegetenv(), or equal a floating-point environment macro.
The feupdateenv() function shall return a zero value if and only if all the required
actions were successfully carried out.
No errors are defined.
The following sections are informative.
The following example shows sample code to hide spurious underflow floating-point excep-
double f(double x)
#pragma STDC FENV_ACCESS ON
// compute result
if (/* test spurious underflow */)
fegetenv() , feholdexcept() , the Base Definitions volume of IEEE Std 1003.1-2001,
Portions 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 orig-
inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 FEUPDATEENV(P)
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