(standards.info) Mmap

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 Mmap
 ====
 
    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 `read' and `write'.
 
    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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