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FERAISEEXCEPT(3P)          POSIX Programmer's Manual         FERAISEEXCEPT(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
       feraiseexcept - raise floating-point exception

SYNOPSIS
       #include <fenv.h>

       int feraiseexcept(int excepts);


DESCRIPTION
       The  feraiseexcept() function shall attempt to raise the supported floating-point exceptions represented by the
       argument excepts. The order in which these floating-point exceptions are raised  is  unspecified.  Whether  the
       feraiseexcept()  function additionally raises the inexact floating-point exception whenever it raises the over-
       flow or underflow floating-point exception is implementation-defined.

RETURN VALUE
       If the argument is zero or if all the specified exceptions  were  successfully  raised,  feraiseexcept()  shall
       return zero.  Otherwise, it shall return a non-zero value.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       The  effect  is  intended  to  be similar to that of floating-point exceptions raised by arithmetic operations.
       Hence, enabled traps for floating-point exceptions raised by this function are taken.

RATIONALE
       Raising overflow or underflow is allowed to also raise inexact because on some architectures the only practical
       way to raise an exception is to execute an instruction that has the exception as a side effect. The function is
       not restricted to accept only valid coincident expressions for atomic operations, so the function can  be  used
       to raise exceptions accrued over several operations.

FUTURE DIRECTIONS
       None.

SEE ALSO
       feclearexcept(),   fegetexceptflag(),   fesetexceptflag(),  fetestexcept(),  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                    FERAISEEXCEPT(3P)