[WASI] Consistency Issue with io::ErrorKind in wasm32-wasip1-threads

[namse]

I have code in a wasm32-wasip1-threads environment that uses std::fs to check if a file exists.

If the file does not exist, as you can see in this code snippet:

rust/library/std/src/sys/pal/wasi/fs.rs

Lines 713 to 727 in acaf0ae

	if fd == -1 {
	if io::Error::last_os_error().raw_os_error() == Some(libc::ENOMEM) {
	// Trigger the internal buffer resizing logic of `Vec` by requiring
	// more space than the current capacity.
	let cap = buf.capacity();
	buf.set_len(cap);
	buf.reserve(1);
	continue;
	}
	let msg = format!(
	"failed to find a pre-opened file descriptor \
	through which {:?} could be opened",
	p
	);
	return Err(io::Error::new(io::ErrorKind::Uncategorized, msg));

, it returns io::ErrorKind::Uncategorized when it cannot find the file descriptor.

In other environments, it provides io::ErrorKind::NotFound. Therefore, I would like this to be consistent.

[tbu-]

It's not really a file not existing, but the environment not giving access to it.

The code won't be able to know if the file exists or not.