This function invokes the error handler assigned to the file handle
fh with the supplied error code errorcode. If the error
handler was successfully called, the process is not aborted, and the
error handler returns, this function returns MPI_SUCCESS.
Unlike errors on communicators and windows, the default errorhandler
for files is MPI_ERRORS_RETURN.
ERRORS
Almost all MPI routines return an error value; C routines as
the value of the function and Fortran routines in the last argument. C++
functions do not return errors. If the default error handler is set to
MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception mechanism
will be used to throw an MPI:Exception object.
See the MPI man page for a full list of MPI error codes.