diff options
Diffstat (limited to 'net/tipc/node_subscr.c')
| -rw-r--r-- | net/tipc/node_subscr.c | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/net/tipc/node_subscr.c b/net/tipc/node_subscr.c new file mode 100644 index 00000000..c3c2815a --- /dev/null +++ b/net/tipc/node_subscr.c @@ -0,0 +1,97 @@ +/* + * net/tipc/node_subscr.c: TIPC "node down" subscription handling + * + * Copyright (c) 1995-2006, Ericsson AB + * Copyright (c) 2005, 2010-2011, 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 "node_subscr.h" +#include "node.h" + +/** + * tipc_nodesub_subscribe - create "node down" subscription for specified node + */ + +void tipc_nodesub_subscribe(struct tipc_node_subscr *node_sub, u32 addr, + void *usr_handle, net_ev_handler handle_down) +{ + if (addr == tipc_own_addr) { + node_sub->node = NULL; + return; + } + + node_sub->node = tipc_node_find(addr); + if (!node_sub->node) { + warn("Node subscription rejected, unknown node 0x%x\n", addr); + return; + } + node_sub->handle_node_down = handle_down; + node_sub->usr_handle = usr_handle; + + tipc_node_lock(node_sub->node); + list_add_tail(&node_sub->nodesub_list, &node_sub->node->nsub); + tipc_node_unlock(node_sub->node); +} + +/** + * tipc_nodesub_unsubscribe - cancel "node down" subscription (if any) + */ + +void tipc_nodesub_unsubscribe(struct tipc_node_subscr *node_sub) +{ + if (!node_sub->node) + return; + + tipc_node_lock(node_sub->node); + list_del_init(&node_sub->nodesub_list); + tipc_node_unlock(node_sub->node); +} + +/** + * tipc_nodesub_notify - notify subscribers that a node is unreachable + * + * Note: node is locked by caller + */ + +void tipc_nodesub_notify(struct tipc_node *node) +{ + struct tipc_node_subscr *ns; + + list_for_each_entry(ns, &node->nsub, nodesub_list) { + if (ns->handle_node_down) { + tipc_k_signal((Handler)ns->handle_node_down, + (unsigned long)ns->usr_handle); + ns->handle_node_down = NULL; + } + } +} |