[PATCH v2] manual: Clarify File Access Modes section and add O_PATH

[Florian Weimer]

* Michael Kerrisk:

>> +reading or writing.  Permission checks for the file itself are skipped
>> +when the file is opened (but permission to access the directory that
>> +contains it is still needed), and permissions are checked when the
>> +descriptor is used later.
>
> Perhaps a little more idiomatic: s/used later/later used/

“is used later on"?

> You switch between "access modes" earlier and "access mode" here.
> I myself tend to use the singular, though I see that POSIX is also
> a little fuzzy in its use of plural vs singular.

I changed the introduction to singular in v3.  Now “modes” refer to
multiple different O_* constants, I think, so it should be consistent.

As discussed a while back, the idea that O_RDWR consists of multiple
access modes is predominantly Hurd-specific.

Thanks,
Florian
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