mount.rs

fn mount_(
    c_source: Option<&CString>,
    c_target: &CString,
    c_fstype: &CString,
    flags: MountFlags,
    c_data: *const c_void,
) -> io::Result<()> {
    let result = unsafe {
        mount(
            c_source.map_or_else(ptr::null, |s| s.as_ptr()),
            c_target.as_ptr(),
            c_fstype.as_ptr(),
            flags.bits(),
            c_data
        )
    };

    match result {
        0 => Ok(()),
        _err => Err(io::Error::last_os_error()),
    }
}