Get the states of the specified floating-point status flags
Synopsis:
#include <fenv.h>
int fegetexceptflag( fexcept_t *flagp,
int excepts );
Arguments:
- flagp
- A pointer to a fexcept_t object where the function can store the state information.
- excepts
- A bitwise OR of the flags whose states you want to get; 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:
- If you want only selected processes to run with the SVE version, you can include both libraries in your OS image
and use the -l m or -l m-sve option to
qcc
to link explicitly against the appropriate one.
- If you want all processes to use the SVE version, include libm-sve.so in your OS image
and set up a symbolic link from libm.so to libm-sve.so.
Use the -l m option to
qcc
to link against the library.
Note:
Compile your program with the -fno-builtin option to prevent the compiler from using a
built-in version of the function.
Description:
The fegetexceptflag() function attempts to store the states of
the specified floating-point exceptions in the object pointed to by flagp.
The state isn't necessarily just a boolean value.
Classification:
C99,
POSIX 1003.1
| Safety: |
|
|---|
| Cancellation point |
No |
| Interrupt handler |
Yes |
| Signal handler |
Yes |
| Thread |
Yes |