static ssize_t write_all(int fd, const char *buf, size_t count) {
	size_t rem = count;
	while (rem > 0) {
//		ssize_t written = write(fd, buf, rem);
//		if (written < 0) {
//			if (errno == EAGAIN || errno == EINTR)
//				continue;
//			return -1;
//		} else if (written == 0) {
//			break;
//		}
//		rem -= written;
//		buf += written;
	}
	return count - rem;
}