Function xcb::ffi::xproto::xcb_open_font_checked

pub unsafe extern "C" fn xcb_open_font_checked(
    c: *mut xcb_connection_t, 
    fid: xcb_font_t, 
    name_len: u16, 
    name: *const c_char
) -> xcb_void_cookie_t

opens a font

Opens any X core font matching the given name (for example "-misc-fixed-*").

Note that X core fonts are deprecated (but still supported) in favor of client-side rendering using Xft.