Abort flush after 10 seconds.

From: Alexander Wirt <formorer@debian.org>

Patch from Debian iproute package.

diff -urNad iproute-20060323~/ip/ipaddress.c iproute-20060323/ip/ipaddress.c
--- iproute-20060323~/ip/ipaddress.c	2006-09-08 17:02:03.000000000 +0200
+++ iproute-20060323/ip/ipaddress.c	2006-09-08 17:03:01.000000000 +0200
@@ -15,6 +15,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
+#include <time.h>
 #include <syslog.h>
 #include <fcntl.h>
 #include <sys/ioctl.h>
@@ -589,6 +590,7 @@
 	if (flush) {
 		int round = 0;
 		char flushb[4096-512];
+		time_t start = time(0);
 
 		filter.flushb = flushb;
 		filter.flushp = 0;
@@ -617,6 +619,12 @@
 				printf("Warum?\n");
 				return 1;
 
+                        if (time(0) - start > 10) {
+                                printf("\n*** Flush not completed after %ld seconds, %d entries remain ***\n",
+                                       time(0) - start, filter.flushed);
+                                exit(1);
+                        }
+
 			if (show_stats) {
 				printf("\n*** Round %d, deleting %d addresses ***\n", round, filter.flushed);
 				fflush(stdout);