|| FreeBSD Kernel Developer's Manual
find the maximum unit number in the class
DESCRIPTION Returns the next unit number to be allocated to device instances in the
devclass. This is one greater than the highest currently allocated unit.
RETURN VALUES The
devclass_get_maxunit() function returns -1 if
NULL, otherwise it returns the next unit number in
AUTHORS This manual page was written by
BUGS The name is confusing since it is one greater than the maximum unit.