file-write-access?[procedure] file-read-access? filename [realuid?]
[procedure] file-write-access? filename [realuid?]
[procedure] file-execute-access? filename [realuid?]
Chicken: check file accessibility. Use effective uid unless
realuid? is given and true. See Concept:FileSystem,
file-permissions.
Some implementations have file-is-readable? or file-readable? etc.
Gauche has sys-access which is POSIX access() interface.
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