Rust PermissionsExt.set_mode用法及代码示例

use std::fs::File;
use std::os::unix::fs::PermissionsExt;

fn main() -> std::io::Result<()> {
    let f = File::create("foo.txt")?;
    let metadata = f.metadata()?;
    let mut permissions = metadata.permissions();

    permissions.set_mode(0o644); // Read/write for owner and read for others.
    assert_eq!(permissions.mode(), 0o644);
    Ok(())
}