Messages in this thread |  | | Date | Mon, 15 Oct 2001 11:12:19 -0500 | From | Tommy Reynolds <> | Subject | Re: share buffer between user and kernel? |
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It was a dark and stormy night. Suddenly "Peter T. Breuer" <ptb@it.uc3m.es> spoke:
> What is the currently approved method of sharing a buffer between > user space and kernel space, so that I can avoid one or two > copy_to/from_user?
Two basic choices here:
1) Allocate the buffer in kernel space and use the mmap() method to give the user-space program access to it; and
2) Allocate the buffer in you user application program and use the KIOBUF method to give the kernel and/or hardware access to your buffer. Look in <linux/iobuf.h> for kernel-level inspiration.
---------------------------------------------+----------------------------- Tommy Reynolds | mailto: <reynolds@redhat.com> Red Hat, Inc., Embedded Development Services | Phone: +1.256.704.9286 307 Wynn Drive NW, Huntsville, AL 35805 USA | FAX: +1.236.837.3839 Senior Software Developer | Mobile: +1.919.641.2923 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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