summaryrefslogtreecommitdiff
path: root/WIN32-Code/win32.c
blob: 867d1f22fd4382b59b5d3cdb248649f1d0c7c507 (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
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
/*
 * Copyright 2000-2002 Niels Provos <provos@citi.umich.edu>
 * Copyright 2003 Michael A. Davis <mike@datanerds.net>
 * 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. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */
#ifdef _MSC_VER
#include "config.h"
#else
/* Avoid the windows/msvc thing. */
#include "../config.h"
#endif

#include <windows.h>
#include <winsock2.h>
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/tree.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assert.h>

#include "log.h"
#include "event.h"
#include "event-internal.h"

#define XFREE(ptr) do { if (ptr) free(ptr); } while(0)

extern struct event_list timequeue;
extern struct event_list addqueue;
extern struct event_list signalqueue;

struct win_fd_set {
	u_int fd_count;
	SOCKET fd_array[1];
};

int evsigcaught[NSIG];
volatile sig_atomic_t signal_caught = 0;
/* MSDN says this is required to handle SIGFPE */
volatile double SIGFPE_REQ = 0.0f;

static void signal_handler(int sig);

void signal_process(void);
int signal_recalc(void);

struct win32op {
	int fd_setsz;
	struct win_fd_set *readset_in;
	struct win_fd_set *writeset_in;
	struct win_fd_set *readset_out;
	struct win_fd_set *writeset_out;
	struct win_fd_set *exset_out;
	int n_events;
	int n_events_alloc;
	struct event **events;
};

void *win32_init	(void);
int win32_insert	(void *, struct event *);
int win32_del	(void *, struct event *);
int win32_recalc	(struct event_base *base, void *, int);
int win32_dispatch	(struct event_base *base, void *, struct timeval *);
void win32_dealloc	(void *);

struct eventop win32ops = {
	"win32",
	win32_init,
	win32_insert,
	win32_del,
	win32_recalc,
	win32_dispatch,
	win32_dealloc
};

#define FD_SET_ALLOC_SIZE(n) ((sizeof(struct win_fd_set) + ((n)-1)*sizeof(SOCKET)))

static int
realloc_fd_sets(struct win32op *op, size_t new_size)
{
	size_t size;

	assert(new_size >= op->readset_in->fd_count &&
	       new_size >= op->writeset_in->fd_count);
	assert(new_size >= 1);

	size = FD_SET_ALLOC_SIZE(new_size);
	if (!(op->readset_in = realloc(op->readset_in, size)))
		return (-1);
	if (!(op->writeset_in = realloc(op->writeset_in, size)))
		return (-1);
	if (!(op->readset_out = realloc(op->readset_out, size)))
		return (-1);
	if (!(op->exset_out = realloc(op->exset_out, size)))
		return (-1);
	if (!(op->writeset_out = realloc(op->writeset_out, size)))
		return (-1);
	op->fd_setsz = new_size;
	return (0);
}

static int
timeval_to_ms(struct timeval *tv)
{
	return ((tv->tv_sec * 1000) + (tv->tv_usec / 1000));
}

static int
do_fd_set(struct win32op *op, SOCKET s, int read)
{
	unsigned int i;
	struct win_fd_set *set = read ? op->readset_in : op->writeset_in;
	for (i=0;i<set->fd_count;++i) {
		if (set->fd_array[i]==s)
			return (0);
	}
	if (set->fd_count == op->fd_setsz) {
		if (realloc_fd_sets(op, op->fd_setsz*2))
			return (-1);
		/* set pointer will have changed and needs reiniting! */
		set = read ? op->readset_in : op->writeset_in;
	}
	set->fd_array[set->fd_count] = s;
	return (set->fd_count++);
}

static int
do_fd_clear(struct win32op *op, SOCKET s, int read)
{
	unsigned int i;
	struct win_fd_set *set = read ? op->readset_in : op->writeset_in;
	for (i=0;i<set->fd_count;++i) {
		if (set->fd_array[i]==s) {
			if (--set->fd_count != i) {
				set->fd_array[i] = set->fd_array[set->fd_count];
			}
			return (0);
		}
	}
	return (0);
}

#define NEVENT 64
void *
win32_init(void)
{
	struct win32op *winop;
	size_t size;
	if (!(winop = calloc(1, sizeof(struct win32op))))
		return NULL;
	winop->fd_setsz = NEVENT;
	size = FD_SET_ALLOC_SIZE(NEVENT);
	if (!(winop->readset_in = malloc(size)))
		goto err;
	if (!(winop->writeset_in = malloc(size)))
		goto err;
	if (!(winop->readset_out = malloc(size)))
		goto err;
	if (!(winop->writeset_out = malloc(size)))
		goto err;
	if (!(winop->exset_out = malloc(size)))
		goto err;
	winop->n_events = 0;
	winop->n_events_alloc = NEVENT;
	if (!(winop->events = malloc(NEVENT*sizeof(struct event*))))
		goto err;
	winop->readset_in->fd_count = winop->writeset_in->fd_count = 0;
	winop->readset_out->fd_count = winop->writeset_out->fd_count
		= winop->exset_out->fd_count = 0;

	return (winop);
 err:
        XFREE(winop->readset_in);
        XFREE(winop->writeset_in);
        XFREE(winop->readset_out);
        XFREE(winop->writeset_out);
        XFREE(winop->exset_out);
        XFREE(winop->events);
        XFREE(winop);
        return (NULL);
}

int
win32_recalc(struct event_base *base, void *arg, int max)
{
	return (signal_recalc());
}

int
win32_insert(void *op, struct event *ev)
{
	struct win32op *win32op = op;
	int i;

	if (ev->ev_events & EV_SIGNAL) {
		if (ev->ev_events & (EV_READ|EV_WRITE))
			event_errx(1, "%s: EV_SIGNAL incompatible use",
			           __func__);
		if((int)signal(EVENT_SIGNAL(ev), signal_handler) == -1)
			return (-1);

		return (0);
	}
	if (!(ev->ev_events & (EV_READ|EV_WRITE)))
		return (0);

	for (i=0;i<win32op->n_events;++i) {
		if(win32op->events[i] == ev) {
			event_debug(("%s: Event for %d already inserted.",
				     __func__, (int)ev->ev_fd));
			return (0);
		}
	}
	event_debug(("%s: adding event for %d", __func__, (int)ev->ev_fd));
	if (ev->ev_events & EV_READ) {
		if (do_fd_set(win32op, ev->ev_fd, 1)<0)
			return (-1);
	}
	if (ev->ev_events & EV_WRITE) {
		if (do_fd_set(win32op, ev->ev_fd, 0)<0)
			return (-1);
	}

	if (win32op->n_events_alloc == win32op->n_events) {
		size_t sz;
		win32op->n_events_alloc *= 2;
		sz = sizeof(struct event*)*win32op->n_events_alloc;
		if (!(win32op->events = realloc(win32op->events, sz)))
			return (-1);
	}
	win32op->events[win32op->n_events++] = ev;

	return (0);
}

int
win32_del(void *op, struct event *ev)
{
	struct win32op *win32op = op;
	int i, found;

	if (ev->ev_events & EV_SIGNAL)
		return ((int)signal(EVENT_SIGNAL(ev), SIG_IGN));

	found = -1;
	for (i=0;i<win32op->n_events;++i) {
		if(win32op->events[i] == ev) {
			found = i;
			break;
		}
	}
	if (found < 0) {
		event_debug(("%s: Unable to remove non-inserted event for %d",
			     __func__, ev->ev_fd));
		return (-1);
	}
	event_debug(("%s: Removing event for %d", __func__, ev->ev_fd));
	if (ev->ev_events & EV_READ)
		do_fd_clear(win32op, ev->ev_fd, 1);
	if (ev->ev_events & EV_WRITE)
		do_fd_clear(win32op, ev->ev_fd, 0);

	if (i != --win32op->n_events) {
		win32op->events[i] = win32op->events[win32op->n_events];
	}

	return 0;
}

static void
fd_set_copy(struct win_fd_set *out, const struct win_fd_set *in)
{
	out->fd_count = in->fd_count;
	memcpy(out->fd_array, in->fd_array, in->fd_count * (sizeof(SOCKET)));
}

/*
  static void dump_fd_set(struct win_fd_set *s)
  {
  unsigned int i;
  printf("[ ");
  for(i=0;i<s->fd_count;++i)
  printf("%d ",(int)s->fd_array[i]);
  printf("]\n");
  }
*/

int
win32_dispatch(struct event_base *base, void *op,
	       struct timeval *tv)
{
	struct win32op *win32op = op;
	int res = 0;
	int i;
	int fd_count;

	fd_set_copy(win32op->readset_out, win32op->readset_in);
	fd_set_copy(win32op->exset_out, win32op->readset_in);
	fd_set_copy(win32op->writeset_out, win32op->writeset_in);

	fd_count =
           (win32op->readset_out->fd_count > win32op->writeset_out->fd_count) ?
	    win32op->readset_out->fd_count : win32op->writeset_out->fd_count;

	if (!fd_count) {
		/* Windows doesn't like you to call select() with no sockets */
		Sleep(timeval_to_ms(tv));
		signal_process();
		return (0);
	}

	res = select(fd_count,
		     (struct fd_set*)win32op->readset_out,
		     (struct fd_set*)win32op->writeset_out,
		     (struct fd_set*)win32op->exset_out, tv);

	event_debug(("%s: select returned %d", __func__, res));

	if(res <= 0) {
		signal_process();
		return res;
	}

	for (i=0;i<win32op->n_events;++i) {
		struct event *ev;
		int got = 0;
		ev = win32op->events[i];
		if ((ev->ev_events & EV_READ)) {
			if (FD_ISSET(ev->ev_fd, win32op->readset_out) ||
			    FD_ISSET(ev->ev_fd, win32op->exset_out)) {
				got |= EV_READ;
			}
		}
		if ((ev->ev_events & EV_WRITE)) {
			if (FD_ISSET(ev->ev_fd, win32op->writeset_out)) {
				got |= EV_WRITE;
			}
		}
		if (!got)
			continue;
		if (!(ev->ev_events & EV_PERSIST)) {
			event_del(ev);
		}
		event_active(ev,got,1);
	}

	if (signal_recalc() == -1)
		return (-1);

	return (0);
}

void
win32_dealloc(void *arg)
{
	struct win32op *win32op = arg;

	if (win32op->readset_in)
		free(win32op->readset_in);
	if (win32op->writeset_in)
		free(win32op->writeset_in);
	if (win32op->readset_out)
		free(win32op->readset_out);
	if (win32op->writeset_out)
		free(win32op->writeset_out);
	if (win32op->exset_out)
		free(win32op->exset_out);
	if (win32op->events)
		free(win32op->events);

	memset(win32op, 0, sizeof(win32op));
	free(win32op);
}

static void
signal_handler(int sig)
{
	evsigcaught[sig]++;
	signal_caught = 1;
}

int
signal_recalc(void)
{
	struct event *ev;

	/* Reinstall our signal handler. */
	TAILQ_FOREACH(ev, &signalqueue, ev_signal_next) {
		if((int)signal(EVENT_SIGNAL(ev), signal_handler) == -1)
			return (-1);
	}
	return (0);
}

void
signal_process(void)
{
	struct event *ev;
	short ncalls;

	TAILQ_FOREACH(ev, &signalqueue, ev_signal_next) {
		ncalls = evsigcaught[EVENT_SIGNAL(ev)];
		if (ncalls) {
			if (!(ev->ev_events & EV_PERSIST))
				event_del(ev);
			event_active(ev, EV_SIGNAL, ncalls);
		}
	}

	memset(evsigcaught, 0, sizeof(evsigcaught));
	signal_caught = 0;
}