[sane-devel] sanei_usb_open() and permission denied

m. allan noah kitno455 at gmail.com
Sun Aug 25 17:58:43 UTC 2013

Your suggested changes sound fine to me.


On Sun, Aug 25, 2013 at 1:09 PM, Chris Bagwell <chris at cnpbagwell.com> wrote:
> Hi all,
> This is probably directly more towards Stéphane based on recent USB work but
> of interest to all.
> The sanie_usb_test.c test is failing on one of my Linux boxes in the
> test_open_all() test... I'd like to get some input on best way to fix this
> failure or if we should fix it at all.
> The reason it is failing for me is because this box has a USB wifi module
> that has a report with Vendor Specific Class/Subclass/Protocol and so sane
> adds it to the list as possible scanner.  The open itself fails when ran by
> normal user because its accessable only by root (EACCES).  The open fails
> when ran as root because its already opened by networking stuff (EBUSY).
> Because these two cases are kinda soft failures, I was thinking about
> changing the test to simply skip over these opens instead of failing the
> whole test case.  What do you think about this change?
> If you agree with that change, the second issue I'll have is that
> sanei_usb_open() seems to treat EPERM as permission denied
> (SANE_STATUS_ACCESS_DENIED) but not EACCES.  Do you see any issues with me
> changing it so both EPERM and EACCES map to SANE_STATUS_ACCESS_DENIED?
> If I don't make that change then the EACCES error code is mapped to generic
> SANE_STATUS_INVAL and I can't tell difference between real failures and
> permission failures.
> Chris
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