+ /* Buffer was 1K, but on linux-3.9.9 it was reported to be too small.
+ * netlink.h: "limit to 8K to avoid MSG_TRUNC when PAGE_SIZE is very large".
+ * Note: on error returns (-1) we exit, no need to free replybuf.
+ */
+ enum { BUF_SIZE = 8 * 1024 };
+ char *replybuf = xmalloc(BUF_SIZE);