[sane-devel] OS/2 version of Sane

[Paul Floyd]

Quoting Oliver Schwartz <Oliver.Schwartz at gmx.de>:

> Hi, 
> 
> > snapscan isn't compiled at all if ipc/semphore headers aren't found.
> > At least that's the intention.
> >
> > > My fix for this is to do something like
> > >
> > > #ifdef OS2
> > > #include "snapscan-usb-stubs.c"
> > > #else
> > > #include "snapscan-usb.c"
> > > #endif
> > >
> > > where the 'stubs' version doesn't include the offending header file,
> but
> > > it does have empty function bodies to keep the linker happy.
> 
> Not a very nice solution in my opinion. 

Expedient. 

> > To the snapscan developers: can this be implemented? Or something
> > similar, e.g. #ifdefing everything that uses ipc.h and sem.h? Is
> > sem.h/ipc.h needed at all?
> 
> The usb part uses semaphores to provide atomic commands. It may be
> possible 
> to replace the semaphore code by something similar, it's only used at
> one 
> place. But then, I'm quite sure that the OS/2 API also supports
> semaphores 
> (DosSemGet() etc., if my memory serves me right). So I'd suggest to map
> the 
> semaphore operations on OS/2 semaphores. 
> 
> For a start we can use separate functions for the semaphore operations
> (and  
> maybe bundle them in a separate file), e.g. snapscani_semaphore_open(),
> 
> snapscani_semaphore_close(), snapscani_semaphore_wait(), 
> snapscani_semaphore_signal. Until an OS/2 implementation is provided the
> OS/2 
> version of the functions may be left empty (maybe issuing a warning
> message). 
> However, the OS/2 implementation should be simple.

Are there any developers that have OS/2 and a USB scanner? For that matter, are
there any backends other than snapscan that use semaphores with USB?

A bientot
Paul
-- 
Paul Floyd   http://paulf.free.fr for those with time to waste
What's the point? The sharp thing on the end.