FD_ISSET
if (rc > 0 && FD_ISSET(me->fd, &set)) {
if (r > 0 && FD_ISSET(STDIN_FILENO, &readfds)) {
if (FD_ISSET(STDIN_FILENO, &rfds))
if (FD_ISSET(fd, &wfds)) {
if (FD_ISSET(fd, &rfds)) {
if (FD_ISSET(STDOUT_FILENO, &wfds)) {
if (ret > 0 && FD_ISSET(fd, &rfds))
if (FD_ISSET(fd, &fds))
direction = FD_ISSET(src_fd, &rfds) ? SRC_TO_TARGET : TARGET_TO_SRC;
if (!FD_ISSET(sfd[3], &w)) {
if (!FD_ISSET(i, &w))
ret = FD_ISSET(self->sock, &rdfs);
if (FD_ISSET(sd, &rfds)) {
if (FD_ISSET(fileno(stdin), &rfds)) {
if (FD_ISSET(lsd, &rfds)) {
if (!FD_ISSET(sk[i], &left))
if (FD_ISSET(sk[i], &fds)) {
if (FD_ISSET(sk[i], &efds)) {
if (FD_ISSET(sock, &readfs))
if (FD_ISSET(sock, &errorfs))
if (!FD_ISSET(tun_fd, &fdset))
if (FD_ISSET(ep0, &rfds))
if (!FD_ISSET(evfd, &rfds))
if (FD_ISSET(ep0, &rfds))
if (FD_ISSET(evfd, &rfds)) {