check_peer_close.c

//check whether the peer has close the socket connection
//netstat -antp  check the rev message queue
struct pollfd pfd[1];
pfd[0].fd = socket_fd;
pfd[0].events = POLLRDHUP;
int ret = poll(pfd, 1, 0);
if (ret > 0) {
  LG_DBG("poll detect RDHUP ret:%d", ret);
}