status.i4.v = fm_close_all([num_closed.i4.r])

	This routine will close all files previously opened by a call
	to fm_open_c.  A failure to close a file in the list of open
	files will terminate the attempt to close the remaining open files.
	(Note: Files are closed automatically on program termination.)

	[num_closed]	returned number of files successfully closed
			(default is NULL)

	This function returns ACNET status values as follows:

	OK			success
	FSHARE_xxx		error closing file

	This function requires the following include files:

	cnsparam_h, cbslib_h, acnet_errors_h

	Related functions:

	fm_close(_c), fm_close_by_name, fm_open(_c), fm_open_io(_c),
	fm_open_read(_c), fm_open_write(_c)

	C/C++ usage:

	int	status;
	int	num_closed;

	status = fm_close_all(&num_closed);