SSL_POLL_EVENT_ISB
if ((item->revents & SSL_POLL_EVENT_ISB) || (item->revents & SSL_POLL_EVENT_ISU)) {
if (item->revents & SSL_POLL_EVENT_ISB)
processed_event = processed_event | SSL_POLL_EVENT_ISB;
#define SSL_POLL_EVENT_IS (SSL_POLL_EVENT_ISB | SSL_POLL_EVENT_ISU)
if ((events & SSL_POLL_EVENT_ISB) != 0
revents |= SSL_POLL_EVENT_ISB;
expected_revents[4] = SSL_POLL_EVENT_OS | SSL_POLL_EVENT_ISB;