manpagez: man pages & more
man kextd(8)
Home | html | info | man
kextd(8)                  BSD System Manager's Manual                 kextd(8)


     kextd -- kernel extension server


     kextd [options]


     kextd is the kernel extension server.  It runs as a standalone launchd(8)
     daemon to handle requests from the kernel and from other user-space pro-
     cesses to load kernel extensions (kexts) or provide information about


     These options are available:

     -c, -no-caches
              Ignore any repository cache files and scan all kext bundles to
              gather information.  If this option is not given, kextd attempts
              to use cache files and to create them if they are out of date or
              don't exist.

     -d, -debug
              Debug mode; print messages to stdout/stderr rather than the
              sysem log.

     -h, -help
              Print a help message describing each option flag and exit with a
              success result, regardless of any other options on the command

     -q, -quiet
              Quiet mode; log no informational or error messages.

     -v [0-6 | 0x####], -verbose [0-6 | 0x####]
              Verbose mode; print information about program operation.  Higher
              levels of verbosity include all lower levels.  By default kextd
              logs at verbose level 1.  You can specify a level from 0-6, or a
              hexadecimal log specification (as described in kext_logging(8)).
              The levels of verbose output are:

              0            Print only errors (that is, suppress warnings); see
                           also -quiet.

              1 (or none)  Print basic information about program operation.

              2            Print information about program operation progress,
                           client requests, and files created.

              3            Print information about individual kexts with an
                           OSBundleEnableKextLogging property set to true.

              4            Print information about spawned child processes.

              5            Print debug-level information.

              6            Identical to level 5 but for all kexts read by the

              See kext_logging(8) for more information on verbose logging.

     -x, -safe-boot
              Run kextd in safe boot mode (indicating startup with the Shift
              key held down).  Kexts that don't specify a proper value for the
              OSBundleRequired info dictionary property will not be loaded.
              As of Mac OS X 10.5 (Leopard), kextd determines from the kernel
              whether the system has started in safe boot mode, so this flag
              is no longer necessary (but may be used for testing).  In safe
              boot mode, kextd does not use caches (that is, this option
              implies the use of the -no-caches option).


     On Mac OS X 10.3 and later, it is possible to reset kextd without termi-
     nating and restarting it, by sending it a HUP signal.  This causes kextd
     to rescan the Extensions folder, rebuild all its caches, and send all I/O
     Kit drivers' personalities to the kernel for a new round of driver match-
     ing.  As of Mac OS X 10.5 (Leopard), kextd watches
     /System/Library/Extensions/ and automatically invokes kextcache(8) to
     rebuild kext caches when its modification time changes.  It also sends
     new drivers' personalities to the kernel at this time.

     Installers that add new drivers can signal kextd in these ways instead of
     requiring the computer to be restarted.  Note that if a hardware device
     has a driver attached when this is done, a newly-installed driver will
     not match on it.  For more information, see ``Apple Developer Technical
     Q&A QA1319: Installing an I/O Kit Kext Without Rebooting''.


     /System/Library/Extensions/  The standard system repository of kernel

                                  Contains all kext caches for a Mac OS X 10.6
                                  (Snow Leopard) system: prelinked kernel,
                                  mkext, and system kext info caches.

                                  Describes specific kext cache files for a
                                  Mac OS X volume.

                                  The launchd.plist(5) controlling the kextd


     kextd normally never exits.  If an error occurs it exits with a nonzero

     kextd logs all error and verbose messages to the system log, or to the
     console if the system log facility isn't available.  When running in
     debug mode all output is printed to the standard output and error


     kextcache(8), kextload(8), kextutil(8), kextstat(8), kextunload(8),
     kextfind(8), syslogd(8), launchd.plist(5)

Darwin                           March 6, 2009                          Darwin

Mac OS X 10.7 - Generated Fri Sep 2 05:53:45 CDT 2011
© 2000-2024
Individual documents may contain additional copyright information.