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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.

     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.

FreeBSD	9.3			 June 16, 1998			   FreeBSD 9.3

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | AUTHORS

Want to link to this manual page? Use this URL:
<http://www.freebsd.org/cgi/man.cgi?query=devclass&manpath=FreeBSD+9.3-RELEASE>

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