devclass_get_maxunit(9) [bsd man page]

DEVCLASS_GET_MAXUNIT(9) 				   BSD Kernel Developer's Manual				   DEVCLASS_GET_MAXUNIT(9)

NAME

     devclass_get_maxunit -- find the maximum unit number in the class

SYNOPSIS

     #include <sys/param.h>
     #include <sys/bus.h>

     int
     devclass_get_maxunit(devclass_t dc);

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.

SEE ALSO

     devclass(9), device(9)

AUTHORS

     This manual page was written by Doug Rabson.

BUGS

     The name is confusing since it is one greater than the maximum unit.

BSD
								   April 3, 2005							       BSD

DEVCLASS(9)						   BSD 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.

     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.

BSD
								   June 16, 1998							       BSD