focal (9) devclass.9freebsd.gz

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.

     Beware that this means devclass must be the same for different bus attachments of the same device driver.

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.