Function fchown 

pub fn fchown<F: AsFd>(fd: F, uid: Option<u32>, gid: Option<u32>) -> Result<()>

Available on non-Hermit and (Unix) and not ((WebAssembly and non-WASI, or Fortanix and SGX)) only.

Change the owner and group of the file referenced by the specified open file descriptor.

For semantics and required privileges, see chown.

Examples

use std::os::unix::fs;

fn main() -> std::io::Result<()> {
    let f = std::fs::File::open("/file")?;
    fs::fchown(&f, Some(0), Some(0))?;
    Ok(())
}