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FETESTEXCEPT(3P)           POSIX Programmer's Manual          FETESTEXCEPT(3P)



PROLOG
       This manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may dif-
       fer (consult the corresponding Linux manual page for details of Linux behavior), or the interface  may  not  be
       implemented on Linux.

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, Stan-
       dard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base  Specifica-
       tions  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 Stan-
       dard,  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(3P)