Am 19.02.2016 um 14:38 schrieb Rolf Leggewie: > Hello, > > I'd like to know if it is possible to have a computer that does > button-triggered scanning via scanbd but also exports the scanner over > the network to be accesible via the common. How would one do that?
Well, absolutely: thats the whole story of scanbd (see the readme.txt of scanbd). With scanbd all scan-request must be via network, even local applications must use network-scanning instead of local (via usb) access to the scanner. >From ReadMe.txt: 0.1) the solution 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 solve this, we use a second daemon (in the so called "manager-mode" of scanbd): scanbm is configured as a "proxy" to access the scanner and, if another application tries to use the scanner, the polling daemon is ordered to disable polling for the time the other scan-application wants to use the scanner. To make this happen, scanbm is configured instead of saned as the network scanning daemon. If a scan request arrives to scanbm on the sane-port, scanbm stops the polling by sending a dbus-signal (default) or a posix-signal (SIGUSR1) (signal-mode) to the polling scanbd-daemon. Then it starts the real saned which scans and sends the data back to the requesting application. Afterwards the scanbd-manager scanbm restarts the polling by sending another dbus-signal (or the posix-signal SIGUSR2) to scanbd. scanbd now reenables polling of the devices. Scanbm is actually only a symbolic link to scanbd. Manager mode can be activatied by calling scanbd as scanbm OR as scanbd -m as in previous version of scanbd. So all applications must be enabled to use network-scanning (even if the scanner is local, see below)! Hth -- Wilhelm -- sane-devel mailing list: sane-devel@lists.alioth.debian.org http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/sane-devel Unsubscribe: Send mail with subject "unsubscribe your_password" to sane-devel-requ...@lists.alioth.debian.org
