err("%s: %s", entp->fts_path, strerror(errno));
if (write(to_fd, p, fs->st_size) != fs->st_size)
err("%s: %s", to.p_path, strerror(errno));
err("%s: %s", entp->fts_path, strerror(errno));
if (write(to_fd, p, fs->st_size) != fs->st_size)
err("%s: %s", to.p_path, strerror(errno));