The fix contains an errno remapping in macOS case where in case
when we try to rename a file into a path with a trailing slash an
ENOENT is returned. In this case, if the destination does not exist,
an ENOTDIR should be thrown as is thrown correctly on Linux hosts.
Thus, as a fix, if an ENOENT is thrown, an additional check is
performed to see whether the destination path indeed contains
a trailing slash, and if so, the errno is adjusted to ENOTDIR
to match the POSIX/WASI spec.
* Fix fd_readdir on BSD-style nixes
The fix was tested on Darwin-XNU and FreeBSD. The change introduces
thread-safe cache of (RawFd, *mut libc::DIR) pairs so that
libc::fdopendir syscall is called only once when invoking fd_readdir
for the first time, and then the pointer to the directory stream,
*mut libc::DIR, is reused until the matching raw file descriptor
is closed.
This fix allows then correct use (and matching to the implementation
on Linux kernels) of libc::seekdir and libc::rewinddir to seek through
and rewind the existing directory stream, *mut libc::DIR, which
otherwise seems to be reset/invalidated every time libc::fdopendir
is called (unlike on Linux, where this behaviour is not observed).
* Store dir stream as part of the FdEntry's Descriptor
* Move bsd specifics into separate module
* Add todo comments and fix formatting
* Refactor int conversions
* Emphasise in debug logs that we're looking at fd_readdir entry
* Change visibility of FdEntry and related to public-private
* Rewrite creating DirStream for the first time
