fesetenv()

Set the current floating-point environment

Synopsis:

#include <fenv.h>

int fesetenv( const fenv_t *envp );

Arguments:

envp
A pointer to a fenv_t object where the function can copy the environment from. You must have obtained this value from a previous call to feholdexcept() or fegetenv(), or be FE_DFL_ENV, which points to a full copy of the default floating-point environment (i.e., the environment as loaded at program startup).

Library:

libm
The general-purpose math library.
libm-sve
(QNX Neutrino 7.1 or later) A library that optimizes the code for ARMv8.2 chips that have Scalable Vector Extension hardware.

Your system requirements will determine how you should work with these libraries:

Note: Compile your program with the -fno-builtin option to prevent the compiler from using a built-in version of the function.

Description:

The fesetenv() function sets the current floating-point environment from the object that envp points to. If any of the floating-point status flags are set in envp, they're set in the environment (and you can then use fetestexcept() to test for them), but the corresponding floating-point exceptions aren't raised.

Returns:

0

Classification:

C99, POSIX 1003.1

Safety:  
Cancellation point No
Interrupt handler Yes
Signal handler Yes
Thread Yes