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use std::io;
use std::path::Path;
#[cfg(unix)]
pub fn device_num<P: AsRef<Path>>(path: P) -> io::Result<u64> {
use std::os::unix::fs::MetadataExt;
path.as_ref().metadata().map(|md| md.dev())
}
#[cfg(windows)]
pub fn device_num<P: AsRef<Path>>(path: P) -> io::Result<u64> {
use winapi_util::{file, Handle};
let h = Handle::from_path_any(path)?;
file::information(h).map(|info| info.volume_serial_number())
}
#[cfg(not(any(unix, windows)))]
pub fn device_num<P: AsRef<Path>>(_: P) -> io::Result<u64> {
Err(io::Error::new(
io::ErrorKind::Other,
"walkdir: same_file_system option not supported on this platform",
))
}