kopia lustrzana https://gitlab.com/sane-project/website
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165 wiersze
6.7 KiB
HTML
<HTML>
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<TITLE>sane-dll.5</TITLE>
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<BODY BGCOLOR=#FFFFFF TEXT=#000000><H1 ALIGN=CENTER><IMG SRC="/images/sane.png" HEIGHT=117 WIDTH=346></H1>
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<H1>sane-dll.5</H1>
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<HR>
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<PRE>
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<!-- Manpage converted by man2html 3.0.1 -->
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<B><A HREF="sane-dll.5.html">sane-dll(5)</A></B> SANE Scanner Access Now Easy <B><A HREF="sane-dll.5.html">sane-dll(5)</A></B>
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</PRE>
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<H2>NAME</H2><PRE>
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sane-dll - SANE dynamic backend loader
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</PRE>
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<H2>DESCRIPTION</H2><PRE>
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The <B>sane-dll</B> library implements a SANE (Scanner Access Now Easy) back-
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end that provides access to an arbitrary number of other SANE backends.
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These backends may either be pre-loaded at the time the <B>sane-dll</B>
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library is built or, on systems that support dynamic loading of shared
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libraries, the backends may be loaded at runtime. In the latter case,
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adding support for a new backend simply involves installing the rele-
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vant library in <I>/usr/local/lib/sane</I> and adding an entry to the <I>dll.conf</I>
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configuration file. In other words, no applications need to be modi-
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fied or recompiled to add support for new devices.
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</PRE>
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<H2>DEVICE NAMES</H2><PRE>
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This backend expects device names of the form:
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<I>backend</I>:<I>device</I>
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Where <I>backend</I> is the name of the backend and <I>device</I> is the name of the
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device in this backend that should be addressed. If the device name
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does not contain a colon (:), then the entire string is treated as the
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<I>device</I> string for the default backend. The default backend is the
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backend listed last in the configuration file (see below) or the first
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pre-loaded backend (if any).
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</PRE>
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<H2>CONFIGURATION</H2><PRE>
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The contents of the <I>dll.conf</I> file is a list of backend names that may
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be loaded dynamically upon demand. Empty lines are ignored, also
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everything after a hash mark (#). A sample configuration file is shown
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below:
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net
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# this is a comment
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pnm
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mustek
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It is also possible to add a file in <I>/usr/local/etc/sane.d/dll.d</I> that
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contains the list of backends to be added. Backends mentioned in a file
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included in this directory will be added before any backends listed in
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<I>dll.conf.</I> Files in <I>/usr/local/etc/sane.d/dll.d</I> can be freely named.
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They shall follow the format conventions as apply for <I>dll.conf.</I>
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Note that backends that were pre-loaded when building this library do
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not have to be listed in this configuration file. That is, if a back-
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end was preloaded, then that backend will always be present, regardless
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of whether it's listed in the configuration file or not.
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The list of preloaded backends is determined by macro <B>PRELOADABLE_BACK-</B>
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<B>ENDS</B> in file backend/Makefile.in of the SANE source code distribution.
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After changing the value of this macro, it is necessary to reconfigure,
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rebuild, and reinstall SANE for the change to take effect.
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Aliases are defined in the config file <I>dll.aliases</I>. It can contain
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entries of the form
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alias SomeName SaneDeviceName
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alias "Some Name" SaneDeviceName
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hide SaneDeviceName
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For example:
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alias Epson net:somehost:epson:/dev/sgX
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alias "Siemens ST400" st400:/dev/sgY
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hide net:somehost:pnm:0
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hide net:somehost:pnm:1
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alias "Read from file" pnm:0
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hide pnm:1
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Aliased device names are automatically hidden.
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The idea is that users don't have to deal with complicated device names
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(especially for networked devices), and to hide other exported devices
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which might confuse them. Note that a hidden device can still be
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accessed if the device name is known, it just doesn't appear on the
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list.
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</PRE>
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<H2>FILES</H2><PRE>
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<I>/usr/local/etc/sane.d/dll.aliases</I>
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The list of aliased or hidden backends.
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<I>/usr/local/etc/sane.d/dll.conf</I>
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The backend configuration file (see also description of
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<B>SANE_CONFIG_DIR</B> below).
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<I>/usr/local/lib/sane/libsane-dll.a</I>
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The static library implementing this backend.
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<I>/usr/local/lib/sane/libsane-dll.so</I>
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The shared library implementing this backend (present on systems
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that support dynamic loading).
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</PRE>
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<H2>ENVIRONMENT</H2><PRE>
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<B>SANE_CONFIG_DIR</B>
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This environment variable specifies the list of directories that
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may contain the configuration file. On *NIX systems, the direc-
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tories are separated by a colon (`:'), under OS/2, they are sep-
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arated by a semi-colon (`;'). If this variable is not set, the
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configuration file is searched in two default directories:
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first, the current working directory (".") and then in
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<I>/usr/local/etc/sane.d</I>. If the value of the environment variable
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ends with the directory separator character, then the default
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directories are searched after the explicitly specified directo-
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ries. For example, setting <B>SANE_CONFIG_DIR</B> to "/tmp/config:"
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would result in directories <I>tmp/config</I>, <I>.</I>, and
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<I>/usr/local/etc/sane.d</I> being searched (in this order).
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<B>SANE_DEBUG_DLL</B>
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If the library was compiled with debug support enabled, this
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environment variable controls the debug level for this backend.
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E.g., a value of 128 requests all debug output to be printed.
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Smaller levels reduce verbosity.
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Value Description
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0 print severe errors only
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1 print normal errors and important messages
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2 print normal messages
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3 print debugging messages
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4 print everything
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Example: export SANE_DEBUG_DLL=3
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</PRE>
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<H2>SEE ALSO</H2><PRE>
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<B><A HREF="sane.7.html">sane(7)</A></B>, <B><A HREF="scanimage.1.html">scanimage(1)</A></B>, <B>sane-"backendname"</B>(5)
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</PRE>
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<H2>AUTHOR</H2><PRE>
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David Mosberger
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13 Jul 2008 <B><A HREF="sane-dll.5.html">sane-dll(5)</A></B>
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</PRE>
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