summaryrefslogtreecommitdiff
path: root/source4/lib/events/events_liboop.c
blob: 53238662f0cafdbadea900781251948e38258762 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
/* 
   Unix SMB/CIFS implementation.
   main select loop and event handling
   wrapper for http://liboop.org/

   Copyright (C) Stefan Metzmacher 2005
   
   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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "includes.h"
#include "lib/events/events.h"
#include "lib/events/events_internal.h"

#include <oop.h>

/*
 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 

 NOTE: this code compiles fine, but is completly *UNTESTED*
       and is only commited as example

 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!	 
*/

static int oop_event_context_destructor(struct event_context *ev)
{
	oop_source_sys *oop_sys = ev->additional_data;

	oop_sys_delete(oop_sys);

	return 0;
}

/*
  create a oop_event_context structure.
*/
static int oop_event_context_init(struct event_context *ev, void *private_data)
{
	oop_source_sys *oop_sys = private_data;

	if (!oop_sys) {
		oop_sys = oop_sys_new();
		if (!oop_sys) {
			return -1;
		}

		talloc_set_destructor(ev, oop_event_context_destructor);
	}

	ev->additional_data = oop_sys;

	return 0;
}

static void *oop_event_fd_handler(oop_source *oop, int fd, oop_event oop_type, void *ptr)
{
	struct fd_event *fde = ptr;

	if (fd != fde->fd) return OOP_ERROR;

	switch(oop_type) {
		case OOP_READ:
			fde->handler(fde->event_ctx, fde, EVENT_FD_READ, fde->private_data);
			return OOP_CONTINUE;
		case OOP_WRITE:
			fde->handler(fde->event_ctx, fde, EVENT_FD_WRITE, fde->private_data);
			return OOP_CONTINUE;			
		case OOP_EXCEPTION:
			return OOP_ERROR;
		case OOP_NUM_EVENTS:
			return OOP_ERROR;
	}

	return OOP_ERROR;
}

/*
  destroy an fd_event
*/
static int oop_event_fd_destructor(struct fd_event *fde)
{
	struct event_context *ev = fde->event_ctx;
	oop_source_sys *oop_sys = ev->additional_data;
	oop_source *oop = oop_sys_source(oop_sys);

	if (fde->flags & EVENT_FD_READ)
		oop->cancel_fd(oop, fde->fd, OOP_READ);
	if (fde->flags & EVENT_FD_WRITE)
		oop->cancel_fd(oop, fde->fd, OOP_WRITE);

	return 0;
}

/*
  add a fd based event
  return NULL on failure (memory allocation error)
*/
static struct fd_event *oop_event_add_fd(struct event_context *ev, TALLOC_CTX *mem_ctx,
					 int fd, uint16_t flags,
					 event_fd_handler_t handler,
					 void *private_data)
{
	struct fd_event *fde;
	oop_source_sys *oop_sys = ev->additional_data;
	oop_source *oop = oop_sys_source(oop_sys);
	
	fde = talloc(mem_ctx?mem_ctx:ev, struct fd_event);
	if (!fde) return NULL;

	fde->event_ctx		= ev;
	fde->fd			= fd;
	fde->flags		= flags;
	fde->handler		= handler;
	fde->private_data	= private_data;
	fde->additional_flags	= 0;
	fde->additional_data	= NULL;

	if (fde->flags & EVENT_FD_READ)
		oop->on_fd(oop, fde->fd, OOP_READ, oop_event_fd_handler, fde);
	if (fde->flags & EVENT_FD_WRITE)
		oop->on_fd(oop, fde->fd, OOP_WRITE, oop_event_fd_handler, fde);

	talloc_set_destructor(fde, oop_event_fd_destructor);

	return fde;
}

/*
  return the fd event flags
*/
static uint16_t oop_event_get_fd_flags(struct fd_event *fde)
{
	return fde->flags;
}

/*
  set the fd event flags
*/
static void oop_event_set_fd_flags(struct fd_event *fde, uint16_t flags)
{
	oop_source_sys *oop_sys;
	oop_source *oop;

	oop_sys = fde->event_ctx->additional_data;
	oop = oop_sys_source(oop_sys);

	if ((fde->flags & EVENT_FD_READ)&&(!(flags & EVENT_FD_READ)))
		oop->cancel_fd(oop, fde->fd, OOP_READ);

	if ((!(fde->flags & EVENT_FD_READ))&&(flags & EVENT_FD_READ))
		oop->on_fd(oop, fde->fd, OOP_READ, oop_event_fd_handler, fde);

	if ((fde->flags & EVENT_FD_WRITE)&&(!(flags & EVENT_FD_WRITE)))
		oop->cancel_fd(oop, fde->fd, OOP_WRITE);

	if ((!(fde->flags & EVENT_FD_WRITE))&&(flags & EVENT_FD_WRITE))
		oop->on_fd(oop, fde->fd, OOP_WRITE, oop_event_fd_handler, fde);

	fde->flags = flags;
}

static int oop_event_timed_destructor(struct timed_event *te);

static int oop_event_timed_deny_destructor(struct timed_event *te)
{
	return -1;
}

static void *oop_event_timed_handler(oop_source *oop, struct timeval t, void *ptr)
{
	struct timed_event *te = ptr;

	/* deny the handler to free the event */
	talloc_set_destructor(te, oop_event_timed_deny_destructor);
	te->handler(te->event_ctx, te, t, te->private_data);

	talloc_set_destructor(te, oop_event_timed_destructor);
	talloc_free(te);

	return OOP_CONTINUE;
}

/*
  destroy a timed event
*/
static int oop_event_timed_destructor(struct timed_event *te)
{
	struct event_context *ev = te->event_ctx;
	oop_source_sys *oop_sys = ev->additional_data;
	oop_source *oop = oop_sys_source(oop_sys);

	oop->cancel_time(oop, te->next_event, oop_event_timed_handler, te);

	return 0;
}

/*
  add a timed event
  return NULL on failure (memory allocation error)
*/
static struct timed_event *oop_event_add_timed(struct event_context *ev, TALLOC_CTX *mem_ctx,
					       struct timeval next_event, 
					       event_timed_handler_t handler, 
					       void *private_data) 
{
	oop_source_sys *oop_sys = ev->additional_data;
	oop_source *oop = oop_sys_source(oop_sys);
	struct timed_event *te;

	te = talloc(mem_ctx?mem_ctx:ev, struct timed_event);
	if (te == NULL) return NULL;

	te->event_ctx		= ev;
	te->next_event		= next_event;
	te->handler		= handler;
	te->private_data	= private_data;
	te->additional_data	= NULL;

	oop->on_time(oop, te->next_event, oop_event_timed_handler, te);

	talloc_set_destructor(te, oop_event_timed_destructor);

	return te;
}

/*
  do a single event loop using the events defined in ev 
*/
static int oop_event_loop_once(struct event_context *ev)
{
	void *oop_ret;
	oop_source_sys *oop_sys = ev->additional_data;

	oop_ret = oop_sys_run_once(oop_sys);
	if (oop_ret == OOP_CONTINUE) {
		return 0;
	}

	return -1;
}

/*
  return on failure or (with 0) if all fd events are removed
*/
static int oop_event_loop_wait(struct event_context *ev)
{
	void *oop_ret;
	oop_source_sys *oop_sys = ev->additional_data;

	oop_ret = oop_sys_run(oop_sys);
	if (oop_ret == OOP_CONTINUE) {
		return 0;
	}

	return -1;
}

static const struct event_ops event_oop_ops = {
	.context_init	= oop_event_context_init,
	.add_fd		= oop_event_add_fd,
	.get_fd_flags	= oop_event_get_fd_flags,
	.set_fd_flags	= oop_event_set_fd_flags,
	.add_timed	= oop_event_add_timed,
	.loop_once	= oop_event_loop_once,
	.loop_wait	= oop_event_loop_wait,
};

const struct event_ops *event_liboop_get_ops(void)
{
	return &event_oop_ops;
}