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IOCLASSCOUNT(8)           BSD System Manager's Manual          IOCLASSCOUNT(8)

NAME
     ioclasscount

SYNOPSIS
     ioclasscount [classname] [...]

DESCRIPTION
     ioclasscount displays the instance counts of OSObject-based C++ classes in the kernel, incremented by
     the number of direct subclasses that have an instance count of at least 1.  For example, if IONetwork-Controller IONetworkController
     Controller is not directly instantiated, but its direct subclass IOEthernetController has any
     instances, then IONetworkController's instance count will be at least 1; if another direct subclass
     such as IOFWController has any instances, then IONetworkController's instance count will be at least 2;
     and so on.  (This modification of instance counts prevents unloading of kexts defining superclasses
     that have no instances, but whose subclasses in other kexts have instances.)

     If classes are specified, instance counts are printed as a comma-separated list in the order specified.
     If no classes are specified, instance counts for all classes are printed, one per line of output and
     sorted by name.

     This information is useful for tracking leaks.  Instance counts can also found in the root of the
     IORegistry in the ``IOKitDiagnostics'' property.

EXAMPLES
     Display instance counts for IOPCIDevice and AppleTestPCI:

     /usr/sbin/ioclasscount IOPCIDevice AppleTestPCI
            IOPCIDevice = 2, AppleTestPCI = 1

SEE ALSO
     ioalloccount(8), ioreg(8)

Darwin                         November 06, 2008                        Darwin