Josh Megnauth c899feb774 Implement fstatat ...

Linux's variant uses the syscall as intended. Redox's variant uses fpath
to build a path to pass to fstat from the file descriptor plus the file
name. Unlike the syscall, this isn't atomic so the liminal space between
fpath/getcwd and fstat is subject to TOCTOU.

Beyond fstatat, I moved the stat test to its correct location and added
an assert since the output of the test is unchecked.

I also added AT_FDCWD which seems to be -100 across Unixes. The other
AT_* constants are unimplemented for now.

2025-08-27 08:21:41 -04:00

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