int nbd_client(int fd) { int ret; int serrno; TRACE("Doing NBD loop"); ret = ioctl(fd, NBD_DO_IT); if (ret == -1 && errno == EPIPE) { /* NBD_DO_IT normally returns EPIPE when someone has disconnected * the socket via NBD_DISCONNECT. We do not want to return 1 in * that case. */ ret = 0; } serrno = errno; TRACE("NBD loop returned %d: %s", ret, strerror(serrno)); TRACE("Clearing NBD queue"); ioctl(fd, NBD_CLEAR_QUE); TRACE("Clearing NBD socket"); ioctl(fd, NBD_CLEAR_SOCK); errno = serrno; return ret; }