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https://git.kernel.org/pub/scm/network/wireless/iwd.git
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9e18552fe7
If during WATCHLIST_NOTIFY{,_MATCHES,_NO_ARGS} one of the watch
notify callback triggers a call to watchlist_destroy, give up calling
remaining watches and destroy the watchlist without crashing. This is
useful in frame-xchg.c (P2P use case) where a frame watch may trigger
a move to a new state after receiving a specific frame, and remove one
group of frame watches (including its watchlist) to create a different
group.
131 lines
4.1 KiB
C
131 lines
4.1 KiB
C
/*
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*
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* Wireless daemon for Linux
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*
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* Copyright (C) 2016-2019 Intel Corporation. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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typedef void (*watchlist_item_destroy_func_t)(void *data);
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struct watchlist_item {
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unsigned int id;
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void *notify;
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void *notify_data;
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watchlist_item_destroy_func_t destroy;
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};
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struct watchlist_ops {
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void (*item_free)(struct watchlist_item *item);
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};
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struct watchlist {
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int next_id;
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struct l_queue *items;
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bool in_notify : 1;
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bool stale_items : 1;
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bool pending_destroy : 1;
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const struct watchlist_ops *ops;
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};
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struct watchlist *watchlist_new(const struct watchlist_ops *ops);
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void watchlist_init(struct watchlist *watchlist,
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const struct watchlist_ops *ops);
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unsigned int watchlist_add(struct watchlist *watchlist, void *notify,
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void *notify_data,
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watchlist_item_destroy_func_t destroy);
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unsigned int watchlist_link(struct watchlist *watchlist,
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struct watchlist_item *item,
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void *notify, void *notify_data,
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watchlist_item_destroy_func_t destroy);
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bool watchlist_remove(struct watchlist *watchlist, unsigned int id);
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void watchlist_destroy(struct watchlist *watchlist);
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void watchlist_free(struct watchlist *watchlist);
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void __watchlist_prune_stale(struct watchlist *watchlist);
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#define WATCHLIST_NOTIFY(watchlist, type, args...) \
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do { \
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const struct l_queue_entry *entry = \
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l_queue_get_entries((watchlist)->items);\
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\
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(watchlist)->in_notify = true; \
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for (; entry; entry = entry->next) { \
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struct watchlist_item *item = entry->data; \
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type t = item->notify; \
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if (item->id == 0) \
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continue; \
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t(args, item->notify_data); \
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if ((watchlist)->pending_destroy) \
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break; \
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} \
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(watchlist)->in_notify = false; \
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if ((watchlist)->pending_destroy) \
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watchlist_destroy(watchlist); \
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else if ((watchlist)->stale_items) \
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__watchlist_prune_stale(watchlist); \
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} while (false) \
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#define WATCHLIST_NOTIFY_MATCHES(watchlist, match, match_data, type, args...) \
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do { \
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const struct l_queue_entry *entry = \
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l_queue_get_entries((watchlist)->items);\
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\
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(watchlist)->in_notify = true; \
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for (; entry; entry = entry->next) { \
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struct watchlist_item *item = entry->data; \
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type t = item->notify; \
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\
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if (item->id == 0) \
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continue; \
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if (!match(item, match_data)) \
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continue; \
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\
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t(args, item->notify_data); \
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\
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if ((watchlist)->pending_destroy) \
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break; \
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} \
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(watchlist)->in_notify = false; \
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if ((watchlist)->pending_destroy) \
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watchlist_destroy(watchlist); \
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else if ((watchlist)->stale_items) \
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__watchlist_prune_stale(watchlist); \
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} while (false)
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#define WATCHLIST_NOTIFY_NO_ARGS(watchlist, type) \
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do { \
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const struct l_queue_entry *entry = \
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l_queue_get_entries((watchlist)->items);\
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\
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(watchlist)->in_notify = true; \
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for (; entry; entry = entry->next) { \
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struct watchlist_item *item = entry->data; \
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type t = item->notify; \
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if (item->id == 0) \
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continue; \
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t(item->notify_data); \
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if ((watchlist)->pending_destroy) \
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break; \
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} \
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(watchlist)->in_notify = false; \
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if ((watchlist)->pending_destroy) \
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watchlist_destroy(watchlist); \
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else if ((watchlist)->stale_items) \
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__watchlist_prune_stale(watchlist); \
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} while (false)
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