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sane-dll(5)									      sane-dll(5)

       sane-dll - SANE dynamic backend loader

       The  sane-dll  library  implements  a SANE (Scanner Access Now Easy) backend that provides
       access to an arbitrary number of other SANE backends.  These backends may either  be  pre-
       loaded at the time the sane-dll library is built or, on systems that support dynamic load-
       ing of shared libraries, the backends may be loaded  at	runtime.   In  the  latter  case,
       adding  support	for  a	new  backend  simply  involves installing the relevant library in
       /usr/lib/sane and adding an entry to the dll.conf configuration file.  In other words,  no
       applications need to be modified or recompiled to add support for new devices.

       This backend expects device names of the form:


       Where  backend  is  the	name  of the backend and device is the name of the device in this
       backend that should be addressed.  If the device name does not contain a colon  (:),  then
       the  entire  string  is treated as the device string for the default backend.  The default
       backend is the backend listed last in the configuration file (see below) or the first pre-
       loaded backend (if any).

       The  contents  of  the dll.conf file is a list of backend names that may be loaded dynami-
       cally upon demand.  Empty lines and lines starting with a hash mark (#)	are  ignored.	A
       sample configuration file is shown below:

	      # this is a comment

       Note  that  backends  that  were  pre-loaded  when building this library do not have to be
       listed in this configuration file.  That is, if a backend was preloaded, then that backend
       will  always  be  present,  regardless of whether it's listed in the configuration file or

       The list of preloaded backends is determined by macro PRELOADABLE_BACKENDS in  file  back-
       end/Makefile.in	of  the  SANE source code distribution.  After changing the value of this
       macro, it is necessary to reconfigure, rebuild, and reinstall SANE for the change to  take

       Aliases are defined in the config file dll.aliases.  It can contain entries of the form

	      alias SomeName SaneDeviceName
	      alias "Some Name" SaneDeviceName
	      hide SaneDeviceName

       For example:

	      alias Epson net:somehost:epson:/dev/sgX
	      alias "Siemens ST400" st400:/dev/sgY
	      hide net:somehost:pnm:0
	      hide net:somehost:pnm:1
	      alias "Read from file" pnm:0
	      hide pnm:1

       Aliased device names are automatically hidden.

       The  idea  is  that users don't have to deal with complicated device names (especially for
       networked devices), and to hide other exported devices which might confuse them. Note that
       a  hidden device can still be accessed if the device name is known, it just doesn't appear
       on the list.

	      The list of aliased or hidden backends.

	      The backend configuration file (see also description of SANE_CONFIG_DIR below).

	      The static library implementing this backend.

	      The shared library implementing this  backend  (present  on  systems  that  support
	      dynamic loading).

	      This  environment  variable  specifies the list of directories that may contain the
	      configuration file.  Under UNIX, the directories are separated by  a  colon  (`:'),
	      under OS/2, they are separated by a semi-colon (`;').  If this variable is not set,
	      the configuration file is searched in two default directories: first,  the  current
	      working  directory  (".") and then in /etc/sane.d.  If the value of the environment
	      variable ends with the directory separator character, then the default  directories
	      are  searched  after  the  explicitly  specified directories.  For example, setting
	      SANE_CONFIG_DIR to "/tmp/config:" would result in  directories  "tmp/config",  ".",
	      and "/etc/sane.d" being searched (in this order).

	      If  the  library was compiled with debug support enabled, this environment variable
	      controls the debug level for this backend.  E.g., a value of 128 requests all debug
	      output to be printed.  Smaller levels reduce verbosity.

	      Value  Descsription
	      0      print severe errors only
	      1      print normal errors and important messages
	      2      print normal messages
	      3      print debugging messages
	      4      print everything

	      export SANE_DEBUG_DLL=3

       sane(7), scanimage(1), sane-"backendname"(5)

       David Mosberger

					   11 Nov 2001				      sane-dll(5)
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