1use std::io;
2use std::path::Path;
3
4#[cfg(unix)]
5pub fn device_num<P: AsRef<Path>>(path: P) -> io::Result<u64> {
6 use std::os::unix::fs::MetadataExt;
7
8 path.as_ref().metadata().map(|md: Metadata| md.dev())
9}
10
11#[cfg(windows)]
12pub fn device_num<P: AsRef<Path>>(path: P) -> io::Result<u64> {
13 use winapi_util::{file, Handle};
14
15 let h = Handle::from_path_any(path)?;
16 file::information(h).map(|info| info.volume_serial_number())
17}
18
19#[cfg(not(any(unix, windows)))]
20pub fn device_num<P: AsRef<Path>>(_: P) -> io::Result<u64> {
21 Err(io::Error::new(
22 io::ErrorKind::Other,
23 "walkdir: same_file_system option not supported on this platform",
24 ))
25}
26