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 functionality described on this reference page is aligned with the ISO C standard. Any
       conflict between the requirements described here and the ISO C standard is  unintentional.
       This volume of POSIX.1‐2008 defers to the ISO C standard.

       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(), fetestexcept()

       The Base Definitions volume of POSIX.1‐2008, <fenv.h>

COPYRIGHT

       Portions of this text are reprinted and  reproduced  in  electronic  form  from  IEEE  Std
       1003.1,  2013  Edition,  Standard  for Information Technology -- Portable Operating System
       Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013  by  the
       Institute  of  Electrical  and  Electronics  Engineers,  Inc and The Open Group.  (This is
       POSIX.1-2008 with the  2013  Technical  Corrigendum  1  applied.)  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.unix.org/online.html .

       Any  typographical  or  formatting errors that appear in this page are most likely to have
       been introduced during the conversion of the source files to man page  format.  To  report
       such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .