Root/net/tipc/node_subscr.c

1/*
2 * net/tipc/node_subscr.c: TIPC "node down" subscription handling
3 *
4 * Copyright (c) 1995-2006, Ericsson AB
5 * Copyright (c) 2005, Wind River Systems
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the names of the copyright holders nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
19 *
20 * Alternatively, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") version 2 as published by the Free
22 * Software Foundation.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#include "core.h"
38#include "dbg.h"
39#include "node_subscr.h"
40#include "node.h"
41#include "addr.h"
42
43/**
44 * tipc_nodesub_subscribe - create "node down" subscription for specified node
45 */
46
47void tipc_nodesub_subscribe(struct tipc_node_subscr *node_sub, u32 addr,
48               void *usr_handle, net_ev_handler handle_down)
49{
50    if (addr == tipc_own_addr) {
51        node_sub->node = NULL;
52        return;
53    }
54
55    node_sub->node = tipc_node_find(addr);
56    if (!node_sub->node) {
57        warn("Node subscription rejected, unknown node 0x%x\n", addr);
58        return;
59    }
60    node_sub->handle_node_down = handle_down;
61    node_sub->usr_handle = usr_handle;
62
63    tipc_node_lock(node_sub->node);
64    list_add_tail(&node_sub->nodesub_list, &node_sub->node->nsub);
65    tipc_node_unlock(node_sub->node);
66}
67
68/**
69 * tipc_nodesub_unsubscribe - cancel "node down" subscription (if any)
70 */
71
72void tipc_nodesub_unsubscribe(struct tipc_node_subscr *node_sub)
73{
74    if (!node_sub->node)
75        return;
76
77    tipc_node_lock(node_sub->node);
78    list_del_init(&node_sub->nodesub_list);
79    tipc_node_unlock(node_sub->node);
80}
81

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