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Don't assume that
mmap either works on all files or fails
for all files. It may work on some files and fail on others.
The proper way to use
mmap is to try it on the specific file for
which you want to use it--and if
mmap doesn't work, fall back on
doing the job in another way using
The reason this precaution is needed is that the GNU kernel (the HURD)
provides a user-extensible file system, in which there can be many
different kinds of "ordinary files." Many of them support
mmap, but some do not. It is important to make programs handle
all these kinds of files.
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