NAME

       scanbd- Scanner button monitoring daemon

SYNOPSIS

       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)

DESCRIPTION

       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

       -c configfile --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.

SEE ALSO

       scanbm(8), sane(7), saned(8), sane-dll(5), sane-net(5) /etc/scanbd/scanbd.conf
       http://scanbd.sourceforge.net

AUTHOR

       Louis Lagendijk