Function us_socket_context_connect 

pub unsafe extern "C" fn us_socket_context_connect(
    ssl: c_int,
    context: *mut us_socket_context_t,
    host: *const c_char,
    port: c_int,
    source_host: *const c_char,
    options: c_int,
    socket_ext_size: c_int,
) -> *mut us_socket_t