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sane-dll(5)		 SANE Scanner Access Now Easy		   sane-dll(5)

       sane-dll - SANE dynamic backend loader

       The  sane-dll library implements a SANE (Scanner Access Now Easy) back‐
       end 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 loading of	shared
       libraries,  the backends may be loaded at runtime.  In the latter case,
       adding support for a new backend simply involves installing  the	 rele‐
       vant  library  in  /system/resources/sane-backends/1.0.18/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

       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 dynamically upon  demand.   Empty  lines  are	ignored,  also
       everything  after a hash mark (#). A sample configuration file is shown

	      # 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 back‐
       end was preloaded, then that backend will always be present, regardless
       of whether it's listed in the configuration file or not.

       The list of preloaded backends is determined by macro PRELOADABLE_BACK‐
       ENDS in file backend/ 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 effect.

       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

	      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 config‐
	      uration  file is searched in two default directories: first, the
	      current	working	  directory   (".")   and   then   in	 /sys‐
	      tem/resources/sane-backends/1.0.18/etc/sane.d.   If the value of
	      the environment variable ends with the directory separator char‐
	      acter,  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	 "/system/resources/sane-back‐
	      ends/1.0.18/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  Description
	      0	     print severe errors only
	      1	     print normal errors and important messages
	      2	     print normal messages
	      3	     print debugging messages
	      4	     print everything

	      Example: export SANE_DEBUG_DLL=3

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

       David Mosberger

sane-backends 1.0.18		  4 Dec 2002			   sane-dll(5)

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