Creates path and any missing parent directories.

Walks back from the deepest non-existent component, recursing on the parent first. If path already exists and is a directory, the call is a no-op success; if it exists and is not a directory, returns Err(IoError(kind: .AlreadyExists)) (EEXIST) without disturbing the file. Each created intermediate uses the default mode 0o755.

Errors

Forwards any mkdir failure verbatim. Specific to this function: Err(IoError(kind: .AlreadyExists)) when path exists as a non-directory.

Examples

mkdirAll("/tmp/foo/bar/baz"); // creates all three levels