scanbd8
Usage
Polling mode:
scanbd [-c
configfile]
[-f]
[-d
[debuglevel]]
Manager-mode
The manager
mode
of
scanbd
that
can
be
triggered
by
the
-m
option
is
not
documented
in
this
man-page
but
in
scanbm(8)
Overview
scanbd is a scanner button monitoring daemon that can trigger execution of scripts when a button on a scanner is pressed. scanbd (the scanner button daemon) opens and polls the scanner and therefore locks the device. So no other application can access the device directly (open the /dev/..., or via libusb, etc).
To enable scanning from applications, we use scanbm as a "proxy" for saned to access the scanner from an application. scanbm listens for requests on the saned network port for scanning requests. If a scan request arrives, scanbm requests the scanbd daemon to release the scanner. Then it starts the real saned which scans and sends the data back to the requesting application. When the scanning is done and saned exits, the scanbm daemon tells scanbd to resume polling the scanner.
scanbd polls the scanner regularly (the interval can be set in scanbd.conf ) and monitors for any scanner button to be pressed. If it detects a button press it triggers execution of the appropriate script as defined in scanbd.conf
Options
-cconfigfile --config=configfile-
Use configfile instead of the default /etc/scanbd/scanbd.conf configuration file.
-d[debuglevel] --debug[=debuglevel]-
turn debug mode on. If specified, set the debug level to debuglevel
1 = error
2 = warn
3 = info
4 - 7 = debug)
-
-f --foreground -
Run scanbd in the foreground
Signals
SIGUSR1-
Stop polling and relase the scanner (used by
scanbm)
SIGUSR1-
Resume polling (used by
scanbm)
- SIGHUP
-
Rescan for available devices (useful when no automatic detection is available (HAL, UDEV) )
Main scanbd configuration
scanbd and scanbm are configured trough scanbd.conf (/etc/scanbd/scanbd.conf). The distributed scanbd.conf contains a detailed explantion of the configuration options.
The -c option can be used to override the default configuration file.
Releases
6 releases since Debian 8 (Jessie); the text changed 1 time.