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 overflow  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, 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 .