Errno handling in kernel.

kernel_netlink.c

@@ -575,7 +575,9 @@ kernel_route(int operation, const unsigned char *dest, unsigned short plen,
     if(nl_command.sock < 0) {
         rc = netlink_socket(&nl_command, 0);
         if(rc < 0) {
+            int olderrno = errno;
             perror("kernel_route: netlink_socket()");
+            errno = olderrno;
             return -1;
         }
     }