NAME

fetestexcept - test floating-point exception flags

SYNOPSIS

c99 [ flag... ] file... -lm [ library... ]
#include <fenv.h>
int fetestexcept(int excepts);

DESCRIPTION

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.

RETURN VALUES

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.

ERRORS

No errors are defined.

EXAMPLES

Example 1 Example using fetestexcept()

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();


      /* ... */
}

ATTRIBUTES

See attributes(7) for descriptions of the following attributes:

ATTRIBUTE TYPE	ATTRIBUTE VALUE
Interface Stability	Standard
MT-Level	MT-Safe