On 3/20/07, Ahmed S. Darwish <darwish.07@xxxxxxxxx> wrote:
On Tue, Mar 20, 2007 at 05:34:03PM +0530, pradeep singh wrote: > >> since there is an open and a close related to every VMA struct for a > >> process address space, does this means vm_area_struct for a process's > >> address space is treated like a file?( in terms with the philosophy of > >> almost everything is file :) ) . > > > >Open and close are called when a region is created and deleted > >respectively. > >no_page is used during page faults for locating the pages and > >allocating it if needed etc. > > Ok got it. > > > > >> Does it means accessing a virtual address space for a process is not > >> allowed if open fails or is not allowed?( suppose i do that > >> delibarately in my module ). > > > >if open fails then it should mean that the region is not created how > >would you access it then? > > So, another question who defines these functions? > Broadly speaking ,Is it the job of the device driver writer? > I think no and yes :( Yes, it is. Though it can be left empty. LDD3 Chapter 15 discusses this topic in a very clean way, check it :).
Done, thank you for the pointer :) --psr
Regards, -- Ahmed S. Darwish http://darwish.07.googlepages.com
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