Andreas Kling a28f29c82c Kernel+LibC: Don't allow a directory to become a subdirectory of itself ...

If you try to do this (e.g "mv directory directory"), sys$rename() will
now fail with EDIRINTOSELF.

Dr. POSIX says we should return EINVAL for this, but a custom error
code allows us to print a much more helpful error message when this
problem occurs. :^)

2020-11-01 19:21:19 +01:00

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