Manual Pages for UNIX Operating System command usage for man sane-dll

SANE Scanner Access Now Easy                          sane-dll(5)



NAME
     sane-dll - SANE dynamic backend loader

DESCRIPTION
     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 sys-
     tems 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 relevant library in /usr/lib/sane and adding an entry to
     the dll.conf configuration file.  In other words, no  appli-
     cations need to be modified or recompiled to add support for
     new devices.

DEVICE NAMES
     This backend expects device names of the form:

          backend:device

     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).

CONFIGURATION
     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 below:

          net
          # this is a comment
          pnm
          mustek

     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 not.

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




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SANE Scanner Access Now Easy                          sane-dll(5)



     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.


FILES
     /etc/sane.d/dll.aliases
          The list of aliased or hidden backends.

     /etc/sane.d/dll.conf
          The backend configuration file (see also description of
          SANE_CONFIG_DIR below).

     /usr/lib/sane/libsane-dll.a
          The static library implementing this backend.

     /usr/lib/sane/libsane-dll.so
          The shared library implementing this  backend  (present
          on systems that support dynamic loading).

ENVIRONMENT
     SANE_CONFIG_DIR
          This environment variable specifies the list of  direc-
          tories  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



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SANE Scanner Access Now Easy                          sane-dll(5)



          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).

     SANE_DEBUG_DLL
          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



SEE ALSO
     sane(7), scanimage(1), " .}S 3 1  "sane-backendname""  "(5)"
     "" "" "" ""


AUTHOR
     David Mosberger

ATTRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:

     _________________________________________________________
    |   ATTRIBUTE TYPE   |           ATTRIBUTE VALUE         |
    |____________________|____________________________________|_
    | Availability       |  image/scanner/xsane/sane-backends|
    |____________________|____________________________________|_
    | Interface Stability|  Uncommitted                      |
    |____________________|___________________________________|

NOTES
     Source for SANE is available on http://opensolaris.org.










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