NAME
fegetenv fesetenv
— get and set current floating-point
environment
SYNOPSIS
#include
<fenv.h>
int fegetenv(fenv_t *envp); int fesetenv(const fenv_t *envp);
DESCRIPTION
[CX] 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.1-2024 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
feholdexcept(3), 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.
RETURN VALUE
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.
ERRORS
No errors are defined.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
feholdexcept(3), feupdateenv(3)
XBD <fenv.h>
CHANGE HISTORY
First released in Issue 6. Derived from the ISO/IEC 9899:1999 (“ISO C99”) standard.
ISO/IEC 9899:1999 (“ISO C99”) standard, Technical Corrigendum 1 is incorporated.