Messages in this thread | | | Date | Thu, 15 May 2008 09:40:47 +0200 | From | "Francis Moreau" <> | Subject | Re: How to avoid data copies in a driver ? |
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Hello,
On Wed, May 14, 2008 at 11:23 PM, linux-os (Dick Johnson) <linux-os@analogic.com> wrote: > You memory-map the data. Impliment mmap() in your driver. > You can also impliment poll() { select() } so your > application knows when new data are available. > > You cannot use a user-mode file-descriptor in the kernel. >
Why not ?
I'm suprised because what I need doens't seem so uncommon, usually devices send or receive data to/from files. So a helper (system call ?) to achieve that other than the basic read/write seems needed, no ?
-- Francis
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