Is there a linux equivalent for fpsetmask()?

Question

I'm porting some BSD code to CentOS, and I find that the standard function fpsetmask() found in ieeefp.h has been used in the code.

I'm not yet aware of this function's behaviour, but is there a linux equivalent of this? Or should I create something that emulates this on linux?

Answer 1

I think the feraiseexcept() function is the equivalent – for details, look at the “Exception handling” subsection of its manpage.

According to the fpsetmask() manpage, the mapping of the individual flags is as follows:

• FP_X_INV → FE_INVALID
• FP_X_DZ → FE_DIVBYZERO
• FP_X_OFL → FE_OVERFLOW
• FP_X_UFL → FE_UNDERFLOW
• FP_X_IMP → FE_INEXACT
• FP_X_IOV → none, possibly FE_OVERFLOW too

Do remember that this is probably x87-only.