# Re: No scanners identified

From: David Gesswein (djg@drs-esg.com)
Date: Fri Mar 02 2001 - 14:22:35 PST

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  > Running scanimage as root will cause an error in loading libraries
  > (undefined symbol: outb), which indicates that the program progresses
  > beyond the point described in my problem.
  >
  I am not sure this is relevant but when I was doing some direct parallel
  port programming I saw that. You must compile with optimization or you
  will get the undefined outb, see the man page clip below.

  Also if it is using outb it needs to be suid root since that is privliged
  when accessing ports above 0x3ff which some of the extended parallel
  port registers are. I have a SCSI scanner so don't know how this all
  relates to sane.

  OUTB(2) Linux Programmer's Manual OUTB(2)

  NAME
  outb, outw, outl, outsb, outsw, outsl - port output
  inb, inw, inl, insb, insw, insl - port input
  outb_p, outw_p, outl_p, inb_p, inw_p, inl_p - paused I/O

  DESCRIPTION
  This family of functions is used to do low level port
  input and output. They are primarily designed for inter
  nal kernel use, but can be used from user space, given the
  following information in addition to that given in outb(9)

  You compile with -O or -O2 or similar. The functions are
  defined as inline macros, and will not be substituted in
  without optimization enabled, causing unresolved refer
  ences at link time.

  David Gesswein
  http://www.pdp8.net/ -- Run an old computers with blinkenlights
  Have any PDP-8 stuff your willing to part with?

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