NAME

       fetestexcept - test floating-point exception flags

SYNOPSIS

       #include <fenv.h>

       int fetestexcept(int excepts);

DESCRIPTION

       The  fetestexcept()  function shall determine 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 VALUE

       The fetestexcept() function shall return 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.

       The following sections are informative.

EXAMPLES

       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();
                  /* ... */
              }

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       feclearexcept()  ,   fegetexceptflag()   ,   feraiseexcept()   ,   the   Base   Definitions   volume   of
       IEEE Std 1003.1-2001, <fenv.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition,
       Standard  for  Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers,
       Inc and The Open Group. In the event of any discrepancy between this version and the  original  IEEE  and
       The  Open  Group  Standard,  the  original  IEEE and The Open Group Standard is the referee document. The
       original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group                                   2003                                       FETESTEXCEPT(P)