[openbeos] driver interface question

for some time now i have been wondering why the declaration of the driver interface posix calls (open, close, ioctl, ...) are split over 3 header files? (i don't know by heart which 3, and i don't have a BeOS system nearby at this moment)

wouldn't it make much more sense to have all those calls combined in 1 header file?
not to mention the fact that the BeBook does not contain information on how to actually call and use device drivers.

i learned it by going through the examples a year ago, but still...

of course i don't know very much about posix, so my question could be a little silly, but does anyone know the 'why' of this?

kind regards,
   Bruno.

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