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