fedisableexcept()

Arguments:

excepts

A bitwise OR of the flags corresponding to the exceptions that you want to mask; 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 — the result is too large to be representable
• FE_UNDERFLOW — the result is subnormal with a loss of precision

Library:

libm

The general-purpose math library.

libm-sve

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.

Description:

The fedisableexcept() function masks the specified floating-point exceptions. To unmask the exceptions, call feenableexcept().

If a floating-point exception occurs but it's masked, the operation that caused the exception will return Not-A-Number (NaN). This design lets you trap NaN values, query which exception flag was raised, and handle the error in your own way instead of receiving a SIGFPE exception, which by default terminates the process.

Returns:

A bitmap of the exceptions that were masked before you called this function.

Classification:

BSD, QNX OS