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From: Alf P. Steinbach (alf_p_steinbach_at_[hidden])
Date: 2005-03-31 11:35:09

Beman Dawes wrote:
> ... with the following errors I can't see any way to know if the path
> actually exists or not:
> [EACCES] Search permission is denied for a component of the path
> prefix.
> [EIO] An error occurred while reading from the file system.
> [ELOOP] A loop exists in symbolic links encountered during
> resolution of the path argument.
> [ENAMETOOLONG] The length of the path argument exceeds {PATH_MAX} or
> a pathname component is longer than {NAME_MAX}.
> If you agree with that analysis, then it looks like exists() should be
> changed to throw on those last four errors.

Looks to me that 'exists()' must yield a tri-state result if its going
to be kept with existing name.

Some questions cannot be answered with only yes or no.

An alternative to tri-state is to split the thing into two or more
functions. I vaguely remember seeing some documentation about this
where the current interface seemed obscure to me, the client code
programmer having to keep in mind a table of possible combinations of
results and what they would mean. Sorry I'm too lazy to look into this
again, but if that vague recollection is correct, then I suggest that
the elements in that table indicate the functions that _should_ be there.

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