DEVCLASS(9)            FreeBSD Kernel Developer's Manual           DEVCLASS(9)

NAME

     devclass - object representing a class of devices

SYNOPSIS

     typedef struct devclass *devclass_t;

DESCRIPTION

     The devclass object has two main functions in the system.  The first is
     to manage the allocation of unit numbers for device instances and the
     second is to hold the list of device drivers for a particular bus type.
     Each devclass has a name and there cannot be two devclasses with the same
     name.  This ensures that unique unit numbers are allocated to device
     instances.  All instances with the same name are treated as being the
     same.

     When no specific unit number is needed, DEVICE_UNIT_ANY is used.

SEE ALSO

     devclass_add_driver(9), devclass_delete_driver(9), devclass_find(9),
     devclass_find_driver(9), devclass_get_device(9), devclass_get_devices(9),
     devclass_get_maxunit(9), devclass_get_name(9), devclass_get_softc(9),
     device(9), driver(9)

AUTHORS

     This manual page was written by Doug Rabson.

FreeBSD 15.1-STABLE-HBSD         June 16, 1998                     DEVCLASS(9)