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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 differ (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  unspeci‐
       fied.  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 suc‐
       cessfully 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 excep‐
       tions raised by arithmetic operations. Hence, enabled traps for	float‐
       ing-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 .

IEEE/The Open Group		     2003		     FERAISEEXCEPT(3P)
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