Shared memory between driver and user

Archived from groups: microsoft.public.windowsxp.device_driver.dev (More info?)

Of course MmMapLockedPagesSpecifyCache can't be caled from usermode.
An usermode app calls ReadFile, WriteFile, or ioctl; the driver that handles
these requests, receives them (in kernel mode) in the context of user application.
And you thought it's simple... Not quite
--PA


"sansegu" <sansegu@hotmail.com> wrote in message news:co1pbk$dcj$1@nsnmrro2-gest.nuria.telefonica-data.net...
> Hi,
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> I been read the 'Sharing Memory Between Drivers and Applications' from the
> NT insider, and I have a serious doubt about how to call a driver function
> within the contest of the user application.
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> The problem is that for calling MmMapLockedPagesSpecifyCache() function I
> need to be in the user space, but I think that I must do this call from the
> driver.
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> Textually, the article says:
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> '.you must call the function from within the context of the process into
> which you want to map the buffer.'
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> How can I do this?
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> Thanks in advance.
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