[PATCH 0/2] Unaligned mmap() on Mac OS X
ken at codeweavers.com
Wed May 12 18:37:45 CDT 2010
On May 12, 2010, at 2:30 PM, Charles Davis wrote:
> In Mac OS X 10.5, mmap() was changed to conform to UNIX '03. Among other
> things, this means that mmap() no longer supports unaligned file offsets
> (like Linux).
What problems does this cause?
> However, by reading Darwin source, I learned that the check for unaligned
> file offsets is done at the library level, and not in the kernel. This is
> to support older binaries compiled for Tiger and earlier. This means that Wine
> compiled for Tiger should support unaligned file offsets, like want. But it
> also means that, if we make the syscall ourselves instead of calling libc, we
> can support them on Leopard (and by extension, Snow Leopard) too! This patch
> series does just that.
Can't we achieve that just by avoiding the mapping of the "mmap" identifier to the _mmap$UNIX2003 symbol?
It may be sufficient to #define _NONSTD_SOURCE, #include <sys/mman.h> as the first header, #undef _NONSTD_SOURCE, and then continue to include any other headers.
Alternatively, you can probably use an approach like this:
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