pauld@scenic.wa.com (Paul Barton-Davis) (11/03/90)
The AT&T System V/386 device driver manual makes some reference to the notion of a layered system call (i.e. where one device driver calls another). Does anyone have any idea of the extent to which the regular System V 3.2 filesystem interface supports layered calls ? I'm musing on modifications to a AMD 29000 coprocessor driver that would enable it to call open() (or rather, the filesystem entry point for open() calls) directly, rather than have to rely on a stub daemon process via signals and ioctls. However, I doubt that the filesystem interface supports this; in particular, assumptions about a meaningful u area would no longer be valid. Any ideas or knowledge ? Please use mail - I don't get news. Paul Barton-Davis <pauld@scenic.wa.com> ScenicSoft, Inc. (206) 776-7760 "Stand down Margaret, stand down please ..."