Hans de Goede wrote: > open /dev/mem > mmap the entire lfb > close /dev/mem > mmap part of the lfb (64k) at a random address, using the mmap of the > entire lfb as source instead of an fd. > mmap another part of the lfb (64k) at the address the previous part had. Just like this, it is not possible. mmap always uses a file descriptor. The closest technique to what you describe is the remap_file_pages() function. No file descriptor needed and you can remap parts of a previously mmap()ed area to other file offsets, on a per-page basis. I.e., map for instance 128k initially, then you can map the 128k/pagesize pages of the map each to a different offset of the underlying "file". And no, you cannot use /proc/self/mem for any of this. mmap of /proc/self/mem is not possible. -- ➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
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