fetestexcept - test floating-point exception flags
c99 [ flag... ] file... –lm [ library... ] #include <fenv.h> int fetestexcept(int excepts);
The fetestexcept() function determines which of a specified subset of the floating-point exception flags are currently set. The excepts argument specifies the floating-point status flags to be queried.
The fetestexcept() function returns the value of the bitwise-inclusive OR of the floating-point exception macros corresponding to the currently set floating-point exceptions included in excepts.
No errors are defined.
The following example calls function f( ) if an invalid exception is set, and then function g( ) if an overflow exception is set:
#include <fenv.h> /* ... */ { # pragma STDC FENV_ACCESS ON int set_excepts; feclearexcept(FE_INVALID | FE_OVERFLOW); // maybe raise exceptions set_excepts = fetestexcept(FE_INVALID | FE_OVERFLOW); if (set_excepts & FE_INVALID) f(); if (set_excepts & FE_OVERFLOW) g(); /* ... */ }
See attributes(7) for descriptions of the following attributes:
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fenv.h(3HEAD), feclearexcept(3M), fegetexceptflag(3M), attributes(7), standards(7)