Function boring_sys::SSL_CTX_set_msg_callback

pub unsafe extern "C" fn SSL_CTX_set_msg_callback(
    ctx: *mut SSL_CTX,
    cb: Option<unsafe extern "C" fn(is_write: c_int, version: c_int, content_type: c_int, buf: *const c_void, len: usize, ssl: *mut SSL, arg: *mut c_void)>
)