dirCreateDirWasi

fn dirCreateDirWasi(userdata: ?*anyopaque, dir: Dir, sub_path: []const u8, permissions: Dir.Permissions) Dir.CreateDirError!void {
    if (builtin.link_libc) return dirCreateDirPosix(userdata, dir, sub_path, permissions);
    const t: *Threaded = @ptrCast(@alignCast(userdata));
    _ = t;
    const syscall: Syscall = try .start();
    while (true) {
        switch (std.os.wasi.path_create_directory(dir.handle, sub_path.ptr, sub_path.len)) {
            .SUCCESS => {
                syscall.finish();
                return;
            },
            .INTR => {
                try syscall.checkCancel();
                continue;
            },
            else => |e| {
                syscall.finish();
                switch (e) {
                    .ACCES => return error.AccessDenied,
                    .BADF => |err| return errnoBug(err), // File descriptor used after closed.
                    .PERM => return error.PermissionDenied,
                    .DQUOT => return error.DiskQuota,
                    .EXIST => return error.PathAlreadyExists,
                    .FAULT => |err| return errnoBug(err),
                    .LOOP => return error.SymLinkLoop,
                    .MLINK => return error.LinkQuotaExceeded,
                    .NAMETOOLONG => return error.NameTooLong,
                    .NOENT => return error.FileNotFound,
                    .NOMEM => return error.SystemResources,
                    .NOSPC => return error.NoSpaceLeft,
                    .NOTDIR => return error.NotDir,
                    .ROFS => return error.ReadOnlyFileSystem,
                    .NOTCAPABLE => return error.AccessDenied,
                    .ILSEQ => return error.BadPathName,
                    else => |err| return posix.unexpectedErrno(err),
                }
            },
        }
    }
}