SSL_POLL_EVENT_OS
#define SSL_POLL_EVENT_OSE (SSL_POLL_EVENT_OS | SSL_POLL_EVENT_EC)
expected_revents[4] = SSL_POLL_EVENT_OS;
expected_revents[4] = SSL_POLL_EVENT_OS | SSL_POLL_EVENT_ISB;
items[0].events = SSL_POLL_EVENT_OS;
expected_items[0].revents = SSL_POLL_EVENT_OS;