> Hmm... I don't know of any way to use mmap() on non-file things,
> either; there are odd special cases, like using MAP_ANONYMOUS on
> /dev/zero to allocate memory, but that's still using a file.
but that's not always the case -- OSF/1 supports
truly anonymous mappings, for example. in fact,
it bombs if you use ANONYMOUS with a file handle:
$ man mmap
...
If MAP_ANONYMOUS is set in the flags parameter:
+ A new memory region is created and initialized to all zeros. This
memory region can be shared only with descendents of the current pro-
cess.
+ If the filedes parameter is not -1, the mmap() function fails.
...
(btw, doing anonymous maps isn't exactly an odd special
case under this operating system; it's the only memory-
allocation mechanism provided by the kernel...)
</F>
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