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HAL-LOCK(1)									      HAL-LOCK(1)

NAME
       hal-lock - lock an interface

SYNOPSIS
       hal-lock [options]

DESCRIPTION
       hal-lock  can  be  used to acquire a lock on a given interface either on a given device or
       globally. For more information about both the big picture and the semantics of HAL  locks,
       refer to the HAL spec which can be found in /usr/share/doc/packages/hal/spec/hal-spec.html
       depending on the distribution.

OPTIONS
       The following options are supported:

       --interface
	      The name of the interface to lock.

       --run  Program to run if the lock was acquired.

       --udi  The UDI (Unique Device Identifier) of the device object. If this is  ommitted,  the
	      global lock will be tried.

       --exclusive
	      Whether the lock can be held by others.

       --exit-with-lock
	      Kill  the program if the acquired lock is lost. This only makes sense if you pass a
	      specific UDI due to the semantics of HAL locks.

       --exit-with-dev
	      Kill the program if the device is removed. This only makes sense if you pass a spe-
	      cific UDI due to the semantics of HAL locks.

       --help Print out usage.

       --version
	      Print the version.

RETURN VALUE
       This  program will attempt to grab a lock on a given interface.	Unless, a specific UDI is
       given, the global lock will be tried.  If the lock was succesfully  acquired  the  program
       specified by the option --run will be run and upon termination this program will exit with
       exit code 0. If the lock wasn't acquired or an error occured while taking the  lock,  this
       program will exit with a non-zero exit code and the given program will not be run.

NOTES
       This program is only useful for launching software that doesn't use HAL at all (since such
       software launched using hal-lock would be locked out itself); for example a partition  ta-
       ble editor part-foo may use wrapper script like this

       hal-lock  --interface  org.freedesktop.Hal.Device.Storage --exclusive --run /path/to/part-
       foo-program

BUGS
       Please send bug	reports  to  either  the  distribution	or  the  HAL  mailing  list,  see
       http://lists.freedesktop.org/mailman/listinfo/hal on how to subscribe.

SEE ALSO
       hald(8), lshal(1), hal-get-property(1), hal-set-property(1), hal-find-by-property(1), hal-
       find-by-capability(1)

AUTHOR
       Written by David Zeuthen <david@fubar.dk> with a lot of help from many others.

										      HAL-LOCK(1)
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