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devclass_get_maxunit(9) [freebsd 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. RETURN VALUES
The devclass_get_maxunit() function returns -1 if dc is NULL, otherwise it returns the next unit number in dc's devclass. ERRORS
None. 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
September 10, 2010 BSD

Check Out this Related Man Page

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

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