kopia lustrzana https://gitlab.com/sane-project/backends
167 wiersze
4.5 KiB
Groff
167 wiersze
4.5 KiB
Groff
.TH sane-dll 5 "4 Dec 2002" "@PACKAGEVERSION@" "SANE Scanner Access Now Easy"
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.IX sane-dll
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.SH NAME
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sane-dll \- SANE dynamic backend loader
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.SH DESCRIPTION
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The
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.B sane-dll
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library implements a SANE (Scanner Access Now Easy) backend that
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provides access to an arbitrary number of other SANE backends. These
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backends may either be pre-loaded at the time the
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.B sane-dll
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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
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relevant library in
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.I @LIBDIR@
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and adding an entry to the
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.I dll.conf
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configuration file. In other words, no applications need to be
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modified or recompiled to add support for new devices.
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.SH "DEVICE NAMES"
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This backend expects device names of the form:
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.PP
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.RS
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.IR backend : device
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.RE
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.PP
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Where
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.I backend
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is the name of the backend and
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.I device
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is the name of the device in this backend that should be addressed.
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If the device name does not contain a colon (:), then the entire string
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is treated as the
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.I device
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string for the default backend. The default backend is the backend
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listed last in the configuration file (see below) or the first
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pre-loaded backend (if any).
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.SH CONFIGURATION
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The contents of the
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.I dll.conf
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file is a list of backend names that may be loaded dynamically upon demand.
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Empty lines are ignored, also everything after a hash mark (#). A sample
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configuration file is shown below:
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.PP
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.RS
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net
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.br
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# this is a comment
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.br
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pnm
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.br
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mustek
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.RE
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.PP
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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
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backend was preloaded, then that backend will always be present,
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regardless of whether it's listed in the configuration file or not.
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.PP
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The list of preloaded backends is determined by macro
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.B PRELOADABLE_BACKENDS
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in file backend/Makefile.in of the SANE source code distribution. After
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changing the value of this macro, it is necessary to reconfigure, rebuild,
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and reinstall SANE for the change to take effect.
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Aliases are defined in the config file
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.IR dll.aliases .
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It can contain entries of the form
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.PP
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.RS
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.br
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alias SomeName SaneDeviceName
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.br
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alias "Some Name" SaneDeviceName
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.br
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hide SaneDeviceName
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.RE
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.PP
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For example:
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.PP
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.RS
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.br
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alias Epson net:somehost:epson:/dev/sgX
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.br
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alias "Siemens ST400" st400:/dev/sgY
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.br
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hide net:somehost:pnm:0
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.br
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hide net:somehost:pnm:1
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.br
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alias "Read from file" pnm:0
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.br
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hide pnm:1
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.RE
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.PP
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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
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names (especially for networked devices), and to hide other exported
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devices which might confuse them. Note that a hidden device can still
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be accessed if the device name is known, it just doesn't appear on the
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list.
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.SH FILES
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.TP
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.I @CONFIGDIR@/dll.aliases
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The list of aliased or hidden backends.
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.TP
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.I @CONFIGDIR@/dll.conf
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The backend configuration file (see also description of
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.B SANE_CONFIG_DIR
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below).
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.TP
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.I @LIBDIR@/libsane-dll.a
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The static library implementing this backend.
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.TP
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.I @LIBDIR@/libsane-dll.so
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The shared library implementing this backend (present on systems that
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support dynamic loading).
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.SH ENVIRONMENT
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.TP
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.B SANE_CONFIG_DIR
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This environment variable specifies the list of directories that may
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contain the configuration file. Under UNIX, the directories are
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separated by a colon (`:'), under OS/2, they are separated by a
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semi-colon (`;'). If this variable is not set, the configuration file
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is searched in two default directories: first, the current working
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directory (".") and then in @CONFIGDIR@. If the value of the
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environment variable ends with the directory separator character, then
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the default directories are searched after the explicitly specified
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directories. For example, setting
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.B SANE_CONFIG_DIR
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to "/tmp/config:" would result in directories "tmp/config", ".", and
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"@CONFIGDIR@" being searched (in this order).
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.TP
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.B SANE_DEBUG_DLL
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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. E.g.,
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a value of 128 requests all debug output to be printed. Smaller
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levels reduce verbosity.
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.ft CR
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.nf
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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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.fi
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.ft R
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Example:
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export SANE_DEBUG_DLL=3
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.SH "SEE ALSO"
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.BR sane (7),
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.BR scanimage (1),
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.BR sane-"backendname" (5)
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.SH AUTHOR
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David Mosberger
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