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

NAME
     kextunload -- terminates objects and unloads code associated with a ker-
     nel extension

SYNOPSIS
     kextunload [-b bundle_id] ...  [-c class_name] ...  [-h] [-p] [ -v [0-6]
                | -q ] [ extension ] ...

DESCRIPTION
     The kextunload program is used to terminate and unregister I/O Kit
     objects associated with a kernel extension (kext) and to unload the code
     and personalities for that kext.  In order to unload a kext kextunload
     must be invoked as the superuser.

     If another loaded kext has a dependency on a kext being unloaded, the
     unload will fail.  You can determine whether a kext has dependents using
     the kextstat(8) tool.

     kextunload is a formal interface for unloading kexts in the Darwin OS and
     in Mac OS X.  Software and installers can rely on its presence and invoke
     it in order to unload kexts.

     The arguments and options available are these:

     extension
              The pathname of a kext to unload.  All instances of classes
              associated with the kext are terminated, and personalities and
              code are unloaded from the kernel.

     -b bundle_id
              Unload code and personalities for the kext whose CFBundleIdenti-
              fier is bundle_id.

     -c class_name
              Terminate all instances of class class_name if possible but do
              not unload code or personalities.  New load requests for devices
              driven by these instances may result in the same class being
              instantiated at any time.

     -h       Print a help message describing each option flag.

     -m bundle_id
              Same as -m (remains for backward compatibility).

     -p       Don't remove personalities when unloading (unnecessary when
              using the -c option).  New load requests for devices driven by
              the kext may result in the same kext being loaded at any time.

     -q       Quiet mode; print no informational or error messages.  This
              option excludes -v.

     -v [0-6]
              Verbose mode; print information about the kext scanning and
              loading process (note that this is generally not useful when
              unloading).  See the man page for kextload(8) to see what each
              verbose level prints.  This option excludes - q .

DIAGNOSTICS
     kextunload exits with a zero status upon success, or prints an error mes-
     sage and exits with a nonzero status upon failure.  An error when multi-
     ple kexts are being unloaded causes kextunload to exit immediately, so
     that some kexts may remain unloaded even if they could have been unloaded
     without error.

BUGS
     The results of unload requests as given by the kernel don't allow for
     determining the reason for a failure, such as that the kext wasn't loaded
     or that another kext has a dependency on it.  You can check these condi-
     tions using kextstat(8).

SEE ALSO
     kextcache(8), kextd(8), kextload(8), kextstat(8)

Darwin                          April 17, 2002                          Darwin