net/tipc/node_subscr.c

   1 /*
   2  * net/tipc/node_subscr.c: TIPC "node down" subscription handling
   3  *
   4  * Copyright (c) 2003-2005, Ericsson Research Canada
   5  * Copyright (c) 2005, Wind River Systems
   6  * Copyright (c) 2005-2006, Ericsson AB
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the names of the copyright holders nor the names of its
  18  *    contributors may be used to endorse or promote products derived from
  19  *    this software without specific prior written permission.
  20  *
  21  * Alternatively, this software may be distributed under the terms of the
  22  * GNU General Public License ("GPL") version 2 as published by the Free
  23  * Software Foundation.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  26  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  29  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  35  * POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include "core.h"
  39 #include "dbg.h"
  40 #include "node_subscr.h"
  41 #include "node.h"
  42 #include "addr.h"
  43
  44 /**
  45  * nodesub_subscribe - create "node down" subscription for specified node
  46  */
  47
  48 void nodesub_subscribe(struct node_subscr *node_sub, u32 addr,
  49                        void *usr_handle, net_ev_handler handle_down)
  50 {
  51         node_sub->node = 0;
  52         if (addr == tipc_own_addr)
  53                 return;
  54         if (!addr_node_valid(addr)) {
  55                 warn("node_subscr with illegal %x\n", addr);
  56                 return;
  57         }
  58
  59         node_sub->handle_node_down = handle_down;
  60         node_sub->usr_handle = usr_handle;
  61         node_sub->node = node_find(addr);
  62         assert(node_sub->node);
  63         node_lock(node_sub->node);
  64         list_add_tail(&node_sub->nodesub_list, &node_sub->node->nsub);
  65         node_unlock(node_sub->node);
  66 }
  67
  68 /**
  69  * nodesub_unsubscribe - cancel "node down" subscription (if any)
  70  */
  71
  72 void nodesub_unsubscribe(struct node_subscr *node_sub)
  73 {
  74         if (!node_sub->node)
  75                 return;
  76
  77         node_lock(node_sub->node);
  78         list_del_init(&node_sub->nodesub_list);
  79         node_unlock(node_sub->node);
  80 }