fesetexceptflag()

Updated: May 06, 2022

Set the states of the specified floating-point status flags

Synopsis:

#include <fenv.h>

int fesetexceptflag( const fexcept_t *flagp,
                     int excepts );

Arguments:

flagp
A pointer to a fexcept_t object where the function can get the state information from.
excepts
A bitwise OR of the flags whose states you want to set; zero or more of the following:
  • FE_ALL_EXCEPT — all the bits
  • FE_DENORMAL — the result of a floating-point expression is a denormalized number
  • FE_DIVBYZERO — pole error
  • FE_INEXACT — the result can't be exactly represented as a floating-point number
  • FE_INVALID — domain error
  • FE_OVERFLOW — result is too large to be representable
  • FE_UNDERFLOW — result is subnormal with a loss of precision

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 fesetexceptflag() function attempts to copy the states of the specified floating-point exceptions from the object pointed to by flagp. It doesn't actually raise any exceptions; it simply sets the state of the flags. The state isn't necessarily just a boolean value.

Returns:

0

Classification:

C99, POSIX 1003.1

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