1 files changed, 79 insertions, 0 deletions

diff --git a/net/tipc/node_subscr.c b/net/tipc/node_subscr.c
new file mode 100644
index 000000000000..79375927916f
--- /dev/null
+++ b/net/tipc/node_subscr.c
@@ -0,0 +1,79 @@
+/*
+ * net/tipc/node_subscr.c: TIPC "node down" subscription handling
+ * 
+ * Copyright (c) 1995-2006, Ericsson AB
+ * Copyright (c) 2005, Wind River Systems
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the names of the copyright holders nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "core.h"
+#include "dbg.h"
+#include "node_subscr.h"
+#include "node.h"
+#include "addr.h"
+
+/**
+ * nodesub_subscribe - create "node down" subscription for specified node
+ */
+
+void nodesub_subscribe(struct node_subscr *node_sub, u32 addr, 
+                       void *usr_handle, net_ev_handler handle_down)
+{
+        node_sub->node = 0;
+        if (addr == tipc_own_addr)
+                return;
+        if (!addr_node_valid(addr)) {
+                warn("node_subscr with illegal %x\n", addr);
+                return;
+        }
+
+        node_sub->handle_node_down = handle_down;
+        node_sub->usr_handle = usr_handle;
+        node_sub->node = node_find(addr);
+        assert(node_sub->node);
+        node_lock(node_sub->node);
+        list_add_tail(&node_sub->nodesub_list, &node_sub->node->nsub);
+        node_unlock(node_sub->node);
+}
+
+/**
+ * nodesub_unsubscribe - cancel "node down" subscription (if any)
+ */
+
+void nodesub_unsubscribe(struct node_subscr *node_sub)
+{
+        if (!node_sub->node)
+                return;
+
+        node_lock(node_sub->node);
+        list_del_init(&node_sub->nodesub_list);
+        node_unlock(node_sub->node);
+}