Function nix::unistd::fchown

pub fn fchown(fd: RawFd, owner: Option<Uid>, group: Option<Gid>) -> Result<()>

Change the ownership of the file referred to by the open file descriptor fd to be owned by the specified owner (user) and group (see fchown(2)).

The owner/group for the provided file will not be modified if None is provided for that argument. Ownership change will be attempted for the path only if Some owner/group is provided.