From: Guus Sliepen <guus@tinc-vpn.org>
Date: Fri, 14 Jan 2011 19:35:40 +0000 (+0100)
Subject: Add a copy of tinc 1.0's event infrastructure.
X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=commitdiff_plain;h=c19cc669d01b7720add8c80a47947a5c43ed12fc

Add a copy of tinc 1.0's event infrastructure.
---

diff --git a/src/event.c b/src/event.c
new file mode 100644
index 00000000..36dab9ff
--- /dev/null
+++ b/src/event.c
@@ -0,0 +1,109 @@
+/*
+    event.c -- event queue
+    Copyright (C) 2002-2009 Guus Sliepen <guus@tinc-vpn.org>,
+                  2002-2005 Ivo Timmermans
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include "system.h"
+
+#include "splay_tree.h"
+#include "event.h"
+#include "utils.h"
+#include "xalloc.h"
+
+splay_tree_t *event_tree;
+
+int id;
+
+static int event_compare(const event_t *a, const event_t *b) {
+	if(a->time > b->time)
+		return 1;
+
+	if(a->time < b->time)
+		return -1;
+
+	return a->id - b->id;
+}
+
+void init_events(void) {
+	event_tree = splay_alloc_tree((splay_compare_t) event_compare, (splay_action_t) free_event);
+}
+
+void exit_events(void) {
+	splay_delete_tree(event_tree);
+}
+
+void expire_events(void) {
+	splay_node_t *node;
+	event_t *event;
+	time_t diff;
+
+	/*
+	 * Make all events appear expired by substracting the difference between
+         * the expiration time of the last event and the current time.
+	 */
+
+	if(!event_tree->tail)
+		return;
+
+	event = event_tree->tail->data;
+	time_t now = time(NULL);
+
+	if(event->time < now)
+		return;
+
+	diff = 1 + event->time - now;
+	
+	for(node = event_tree->head; node; node = node->next) {
+		event = node->data;
+		event->time -= diff;
+	}
+}
+
+event_t *new_event(void) {
+	return xmalloc_and_zero(sizeof(event_t));
+}
+
+void free_event(event_t *event) {
+	free(event);
+}
+
+void event_add(event_t *event) {
+	event->id = ++id;
+	splay_insert(event_tree, event);
+}
+
+void event_del(event_t *event) {
+	splay_delete(event_tree, event);
+}
+
+event_t *get_expired_event(void) {
+	event_t *event;
+
+	if(event_tree->head) {
+		event = event_tree->head->data;
+
+		if(event->time < time(NULL)) {
+			splay_node_t *node = event_tree->head;
+			splay_unlink_node(event_tree, node);
+			free(node);
+			return event;
+		}
+	}
+
+	return NULL;
+}
diff --git a/src/event.h b/src/event.h
new file mode 100644
index 00000000..b823c725
--- /dev/null
+++ b/src/event.h
@@ -0,0 +1,46 @@
+/*
+    event.h -- header for event.c
+    Copyright (C) 2002-2009 Guus Sliepen <guus@tinc-vpn.org>,
+                  2002-2005 Ivo Timmermans
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#ifndef __TINC_EVENT_H__
+#define __TINC_EVENT_H__
+
+#include "splay_tree.h"
+
+extern splay_tree_t *event_tree;
+
+typedef void (*event_handler_t)(void *);
+
+typedef struct event {
+	time_t time;
+	int id;
+	event_handler_t handler;
+	void *data;
+} event_t;
+
+extern void init_events(void);
+extern void exit_events(void);
+extern void expire_events(void);
+extern event_t *new_event(void) __attribute__ ((__malloc__));
+extern void free_event(event_t *);
+extern void event_add(event_t *);
+extern void event_del(event_t *);
+extern event_t *get_expired_event(void);
+
+#endif							/* __TINC_EVENT_H__ */