+
+ /* checking for closed peer connection */
+ pfd.fd = fd;
+ pfd.events = POLLIN | POLLHUP;
+ pfd.revents = 0;
+ if (poll(&pfd, 1, 0) > 0) {
+ char buffer[32];
+ if (recv(fd, buffer, sizeof(buffer), MSG_PEEK | MSG_DONTWAIT) == 0) {
+ // if recv returns zero (even though poll() said there is data to be read),
+ // that means the connection has been closed
+ return -1;
+ }
+ }