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 .