Josh Megnauth f5d432644f Implement renameat, renameat2 ...

Like the other "at" functions, renameat renames files with respect with
a directory descriptor. "renameat2" is Linux specific but really nice -
it adds a flag which supports atomically swapping two files or failing
if the target already exists. The latter is easily supported in relibc.
The former requires redoxfs support.

Besides the impl itself, I refactored "cap_path_at" into what it really
is: a mini openat2-like function.

2025-10-21 14:47:39 -04:00

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