1 files changed, 76 insertions, 0 deletions
diff --git a/net/tipc/node_subscr.c b/net/tipc/node_subscr.c
new file mode 100644
index 0000000000000..c38a3b0e847d0
--- /dev/null
+++ b/net/tipc/node_subscr.c
@@ -0,0 +1,76 @@
+/*
+ * net/tipc/node_subscr.c: TIPC "node down" subscription handling
+ * 
+ * Copyright (c) 2003-2005, Ericsson Research Canada
+ * Copyright (c) 2005, Wind River Systems
+ * Copyright (c) 2005-2006, Ericsson AB
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without 
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this 
+ * list of conditions and the following disclaimer.
+ * 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.
+ * 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.
+ *
+ * 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);
+}