Hi, On Sun, Feb 03, 2002 at 01:06:12PM -0500, Douglas Gilbert wrote: > The sg ioctl SG_GET_SCSI_ID yields the same information as > > SCSI_IOCTL_GET_IDLUN plus the SCSI device type. SANE should > be only interested in SCSI device types: > - SCANNER (6) > - PROCESSOR (3) [HP scanners prefer this type]
Can anyone write a patch for this so we can test it? I won't touch sanei_scsi.c with all it's different paths for different systems. Way to complex for me :-) > Just a suggestion ... once SANE spots a SCSI, USB, parport > etc. scanner it should hold open a file descriptor to it. If > the scanner is hot unplugged you should get a sensible > error message next time you try to access it (e.g. ENODEV). > By keeping a fd open to a device the module subsystem > (or the user) is inhibited from "autocleaning" the module > away. If that happens then the next time you open /dev/sg2 > (for example) it may not be the scanner you expect it to > be! SANE could then have a high level function to rescan > for devices. Hooks could also be added so hotplug (and unplug) > alerts could be consumed sensibly. A common case would be > users power cycling their scanners. Maybe an idea for SANE2. But all backends must be rewritten for this to work. Bye, Henning
