core: new sr events system

- designed to have small footprint in core
- the goal is to execute a event manager function during core processing
- event managers can be implemented in modules or elsewhere
- two event types added: SREV_NET_DATA_IN and SREV_NET_DATA_OUT (see the
  other commit)

events.c

@@ -0,0 +1,90 @@
+/**
+ * $Id$
+ *
+ * Copyright (C) 2009 SIP-Router.org
+ *
+ * This file is part of Extensible SIP Router, a free SIP server.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "dprint.h"
+#include "mem/mem.h"
+#include "events.h"
+
+static sr_event_cb_t _sr_events_list;
+static int _sr_events_inited = 0;
+
+void sr_event_cb_init(void)
+{
+	if(_sr_events_inited == 0)
+	{
+		memset(&_sr_events_list, 0, sizeof(sr_event_cb_t));
+		_sr_events_inited = 1;
+	}
+}
+
+int sr_event_register_cb(int type, sr_event_cb_f f)
+{
+	sr_event_cb_init();
+	switch(type) {
+		case SREV_NET_DATA_IN:
+				if(_sr_events_list.net_data_in==0)
+					_sr_events_list.net_data_in = f;
+				else return -1;
+			break;
+		case SREV_NET_DATA_OUT:
+				if(_sr_events_list.net_data_out==0)
+					_sr_events_list.net_data_out = f;
+				else return -1;
+			break;
+		default:
+			return -1;
+	}
+	return 0;
+}
+
+int sr_event_exec(int type, void *data)
+{
+	int ret;
+	str *p;
+	switch(type) {
+		case SREV_NET_DATA_IN:
+				if(_sr_events_list.net_data_in!=0)
+				{
+					p = (str*)data;
+					LM_DBG("PRE-IN ++++++++++++++++++++++++++++++++\n"
+							"%.*s\n+++++\n", p->len, p->s);
+					ret = _sr_events_list.net_data_in(data);
+					LM_DBG("POST-IN ++++++++++++++++++++++++++++++++\n"
+							"%.*s\n+++++\n", p->len, p->s);
+					return ret;
+				} else return 1;
+			break;
+		case SREV_NET_DATA_OUT:
+				if(_sr_events_list.net_data_out!=0)
+				{
+					p = (str*)data;
+					LM_DBG("PRE-OUT ++++++++++++++++++++\n"
+							"%.*s\n+++++++++++++++++++\n", p->len, p->s);
+					ret = _sr_events_list.net_data_out(data);
+					LM_DBG("POST-OUT ++++++++++++++++++++\n"
+							"%.*s\n+++++++++++++++++++\n", p->len, p->s);
+					return ret;
+				} else return 1;
+			break;
+		default:
+			return -1;
+	}
+}
+

events.h

@@ -0,0 +1,40 @@
+/**
+ * $Id$
+ *
+ * Copyright (C) 2009 SIP-Router.org
+ *
+ * This file is part of Extensible SIP Router, a free SIP server.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef _SR_EVENTS_H_
+#define _SR_EVENTS_H_
+
+#include "parser/msg_parser.h"
+
+#define SREV_NET_DATA_IN	1
+#define SREV_NET_DATA_OUT	2
+
+typedef int (*sr_event_cb_f)(void *data);
+
+typedef struct sr_event_cb {
+	sr_event_cb_f net_data_in;
+	sr_event_cb_f net_data_out;
+} sr_event_cb_t;
+
+void sr_event_cb_init(void);
+int sr_event_register_cb(int type, sr_event_cb_f f);
+int sr_event_exec(int type, void *data);
+
+#endif