Function openssl_sys::SSL_CTX_sess_set_get_cb

pub unsafe extern "C" fn SSL_CTX_sess_set_get_cb(
    ctx: *mut SSL_CTX, 
    get_session_cb: Option<unsafe extern "C" fn(_: *mut SSL, _: *const c_uchar, _: c_int, _: *mut c_int) -> *mut SSL_SESSION>
)