BIO_CTRL_DGRAM_GET_EFFECTIVE_CAPS
case BIO_CTRL_DGRAM_GET_EFFECTIVE_CAPS:
case BIO_CTRL_DGRAM_GET_EFFECTIVE_CAPS: /* Non-threadsafe */
case BIO_CTRL_DGRAM_GET_EFFECTIVE_CAPS: /* Non-threadsafe */
(uint32_t)BIO_ctrl((b), BIO_CTRL_DGRAM_GET_EFFECTIVE_CAPS, 0, NULL)