Function nix::unistd::fchown
pub fn fchown(fd: RawFd, owner: Option<Uid>, group: Option<Gid>) -> Result<()>Documentation
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.