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kextunload(8) [opendarwin man page]

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

kextunload -- terminates objects and unloads code associated with a kernel 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 CFBundleIdentifier 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 message and exits with a nonzero status upon failure. An error when multiple 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 conditions using kextstat(8). SEE ALSO
kextcache(8), kextd(8), kextload(8), kextstat(8) Darwin April 17, 2002 Darwin

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

kextload -- load kernel extensions (kexts) into the kernel SYNOPSIS
kextload [options] [--] [kext ...] DESCRIPTION
The kextload program is used to explicitly load kernel extensions (kexts). For most kexts, kextload must run as the superuser (root). Kexts installed under /System/ with an OSBundleAllowUserLoad property set to true may be loaded via kextload by non-root users. Notice: On Mac OS X 10.6 (Snow Leopard), the developer functionality of kextload has moved to the new program kextutil(8); all developer- related options have been removed from kextload and are no longer recognized. On Mac OS X 10.6 (Snow Leopard), kextload simply forwards a load request to kextd(8), which performs all communication with the kernel. kextload is a formal interface for kext loading in all versions of Darwin OS and Mac OS X. Software and installers can rely on its presence and invoke it in order to load kexts. Note that long options are present as of Mac OS X 10.6 (Snow Leopard). Mac OS X 10.6 (Snow Leopard) introduces C functions for loading kexts: KextManagerLoadKextWithIdentifier() and KextManagerLoadKextWithURL(), which are described in Apple's developer documentation. ARGUMENTS AND OPTIONS
kext The pathname of a kext bundle to load. The kext's plugins are available for dependency resolution. Kexts can also be specified by CFBundleIdentifier with the -bundle-id option. -b identifier, -bundle-id identifier Look up the kext whose CFBundleIdentifier is identifier within the set of known kexts and load it. The kext of the highest CFBundleVersion with the given identifier is used; in the case of version ties, the last such kext specified on the command line is used. See the -dependency and -repository options for more information. -d kext, -dependency kext Add kext and its plugins to the set of known kexts for resolving dependencies. This is useful for adding a single kext from a directory while excluding the others. See the -repository option for more information. -h, -help Print a help message describing each option flag and exit with a success result, regardless of any other options on the command line. -q, -quiet Quiet mode; print no informational or error messages. -r directory, -repository directory Use directory as a repository of kexts. This adds to the set of known kexts for resolving dependencies or looking up by CFBundleI- dentifier when using the -bundle-id option. This is not recursive; only kexts directly within the directory, and their plugins, are scanned. See also the -dependency option. -v [0-6 | 0x####], -verbose [0-6 | 0x####] Verbose mode; print information about program operation. Higher levels of verbosity include all lower levels. You can specify a level from 0-6, or a bitmask of flags as a hexadecimal number prefixed with 0x (as described in kext_logging(8)). Because kextload messages kextd(8), to perform the actual work of loading, the decimal levels 1-6 generally have little effect. You may wish to use kextutil(8) if you want verbose output about the kext loading operation. -- End of all options. Only kext names follow. EXAMPLES
To load a kext, run kextload and supply a kext bundle name; no options are required: kextload TabletDriver.kext Alternatively, you can use the -bundle-id (-b) option to specify a kext by its CFBundleIdentifier: kextload -bundle-id com.mycompany.driver.TabletDriver With no additional options kextload looks in the extensions directories (/System/Library/Extensions/ and /Library/Extensions/) for a kext with the given CFBundleIdentifier. Adding repository directories with the -repository option or individual kexts with the -dependency option expands the set of kexts that kextload looks among for dependency resolution and for loading by bundle identifier: kextload -repository /Applications/ TabletDriver.kext FILES
/System/Library/Extensions/ The standard system repository of kernel extensions /Library/Extensions/ The standard repository of non Apple kernel extensions DIAGNOSTICS
kextload exits with a zero status if all kexts specified load successfully (or are already loaded). If any kext fails to load, kextload prints an error message for that kext, continues trying to load any remaining kexts, then exits with a nonzero status. For a kext to be loadable, it must be valid, authenticated, and all dependencies of the kext must be available and loadable. A valid kext has a well formed bundle, info dictionary, and an executable built for the running kernel's architecture. An authentic kext's component files, not including plugins, are owned by root:wheel, with permissions nonwritable by group and other. If your kext fails to load, try using kextutil(8) to examine the kext for problems. SEE ALSO
kextcache(8), kextd(8), kextstat(8), kextunload(8), kextutil(8), kext_logging(8) Darwin November 14, 2012 Darwin
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