xref: /freebsd/contrib/libevent/test/regress_bufferevent.c (revision 52c2bb75163559a6e2866ad374a7de67a4ea1273)
1 /*
2  * Copyright (c) 2003-2007 Niels Provos <provos@citi.umich.edu>
3  * Copyright (c) 2007-2012 Niels Provos and Nick Mathewson
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 3. The name of the author may not be used to endorse or promote products
14  *    derived from this software without specific prior written permission.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26  */
27 #include "util-internal.h"
28 
29 /* The old tests here need assertions to work. */
30 #undef NDEBUG
31 
32 #ifdef _WIN32
33 #include <winsock2.h>
34 #include <windows.h>
35 #endif
36 
37 #include "event2/event-config.h"
38 
39 #include <sys/types.h>
40 #include <sys/stat.h>
41 #ifdef EVENT__HAVE_SYS_TIME_H
42 #include <sys/time.h>
43 #endif
44 #include <sys/queue.h>
45 #ifndef _WIN32
46 #include <sys/socket.h>
47 #include <sys/wait.h>
48 #include <signal.h>
49 #include <unistd.h>
50 #include <netdb.h>
51 #include <netinet/in.h>
52 #endif
53 #include <fcntl.h>
54 #include <signal.h>
55 #include <stdlib.h>
56 #include <stdio.h>
57 #include <string.h>
58 #include <errno.h>
59 #include <assert.h>
60 
61 #ifdef EVENT__HAVE_ARPA_INET_H
62 #include <arpa/inet.h>
63 #endif
64 
65 #include "event2/event-config.h"
66 #include "event2/event.h"
67 #include "event2/event_struct.h"
68 #include "event2/event_compat.h"
69 #include "event2/tag.h"
70 #include "event2/buffer.h"
71 #include "event2/bufferevent.h"
72 #include "event2/bufferevent_compat.h"
73 #include "event2/bufferevent_struct.h"
74 #include "event2/listener.h"
75 #include "event2/util.h"
76 
77 #include "bufferevent-internal.h"
78 #include "evthread-internal.h"
79 #include "util-internal.h"
80 #ifdef _WIN32
81 #include "iocp-internal.h"
82 #endif
83 
84 #include "regress.h"
85 #include "regress_testutils.h"
86 
87 /*
88  * simple bufferevent test
89  */
90 
91 static void
92 readcb(struct bufferevent *bev, void *arg)
93 {
94 	if (evbuffer_get_length(bev->input) == 8333) {
95 		struct evbuffer *evbuf = evbuffer_new();
96 		assert(evbuf != NULL);
97 
98 		/* gratuitous test of bufferevent_read_buffer */
99 		bufferevent_read_buffer(bev, evbuf);
100 
101 		bufferevent_disable(bev, EV_READ);
102 
103 		if (evbuffer_get_length(evbuf) == 8333) {
104 			test_ok++;
105 		}
106 
107 		evbuffer_free(evbuf);
108 	}
109 }
110 
111 static void
112 writecb(struct bufferevent *bev, void *arg)
113 {
114 	if (evbuffer_get_length(bev->output) == 0) {
115 		test_ok++;
116 	}
117 }
118 
119 static void
120 errorcb(struct bufferevent *bev, short what, void *arg)
121 {
122 	test_ok = -2;
123 }
124 
125 static void
126 test_bufferevent_impl(int use_pair, int flush)
127 {
128 	struct bufferevent *bev1 = NULL, *bev2 = NULL;
129 	char buffer[8333];
130 	int i;
131 	int expected = 2;
132 
133 	if (use_pair) {
134 		struct bufferevent *pair[2];
135 		tt_assert(0 == bufferevent_pair_new(NULL, 0, pair));
136 		bev1 = pair[0];
137 		bev2 = pair[1];
138 		bufferevent_setcb(bev1, readcb, writecb, errorcb, bev1);
139 		bufferevent_setcb(bev2, readcb, writecb, errorcb, NULL);
140 		tt_int_op(bufferevent_getfd(bev1), ==, -1);
141 		tt_ptr_op(bufferevent_get_underlying(bev1), ==, NULL);
142 		tt_ptr_op(bufferevent_pair_get_partner(bev1), ==, bev2);
143 		tt_ptr_op(bufferevent_pair_get_partner(bev2), ==, bev1);
144 	} else {
145 		bev1 = bufferevent_new(pair[0], readcb, writecb, errorcb, NULL);
146 		bev2 = bufferevent_new(pair[1], readcb, writecb, errorcb, NULL);
147 		tt_int_op(bufferevent_getfd(bev1), ==, pair[0]);
148 		tt_ptr_op(bufferevent_get_underlying(bev1), ==, NULL);
149 		tt_ptr_op(bufferevent_pair_get_partner(bev1), ==, NULL);
150 		tt_ptr_op(bufferevent_pair_get_partner(bev2), ==, NULL);
151 	}
152 
153 	{
154 		/* Test getcb. */
155 		bufferevent_data_cb r, w;
156 		bufferevent_event_cb e;
157 		void *a;
158 		bufferevent_getcb(bev1, &r, &w, &e, &a);
159 		tt_ptr_op(r, ==, readcb);
160 		tt_ptr_op(w, ==, writecb);
161 		tt_ptr_op(e, ==, errorcb);
162 		tt_ptr_op(a, ==, use_pair ? bev1 : NULL);
163 	}
164 
165 	bufferevent_disable(bev1, EV_READ);
166 	bufferevent_enable(bev2, EV_READ);
167 
168 	tt_int_op(bufferevent_get_enabled(bev1), ==, EV_WRITE);
169 	tt_int_op(bufferevent_get_enabled(bev2), ==, EV_WRITE|EV_READ);
170 
171 	for (i = 0; i < (int)sizeof(buffer); i++)
172 		buffer[i] = i;
173 
174 	bufferevent_write(bev1, buffer, sizeof(buffer));
175 	if (flush >= 0) {
176 		tt_int_op(bufferevent_flush(bev1, EV_WRITE, flush), >=, 0);
177 	}
178 
179 	event_dispatch();
180 
181 	bufferevent_free(bev2);
182 	tt_ptr_op(bufferevent_pair_get_partner(bev1), ==, NULL);
183 	bufferevent_free(bev1);
184 
185 	/** Only pair call errorcb for BEV_FINISHED */
186 	if (use_pair && flush == BEV_FINISHED) {
187 		expected = -1;
188 	}
189 	if (test_ok != expected)
190 		test_ok = 0;
191 end:
192 	;
193 }
194 
195 static void test_bufferevent(void) { test_bufferevent_impl(0, -1); }
196 static void test_bufferevent_pair(void) { test_bufferevent_impl(1, -1); }
197 
198 static void test_bufferevent_flush_normal(void) { test_bufferevent_impl(0, BEV_NORMAL); }
199 static void test_bufferevent_flush_flush(void) { test_bufferevent_impl(0, BEV_FLUSH); }
200 static void test_bufferevent_flush_finished(void) { test_bufferevent_impl(0, BEV_FINISHED); }
201 
202 static void test_bufferevent_pair_flush_normal(void) { test_bufferevent_impl(1, BEV_NORMAL); }
203 static void test_bufferevent_pair_flush_flush(void) { test_bufferevent_impl(1, BEV_FLUSH); }
204 static void test_bufferevent_pair_flush_finished(void) { test_bufferevent_impl(1, BEV_FINISHED); }
205 
206 #if defined(EVTHREAD_USE_PTHREADS_IMPLEMENTED)
207 /**
208  * Trace lock/unlock/alloc/free for locks.
209  * (More heavier then evthread_debug*)
210  */
211 typedef struct
212 {
213 	void *lock;
214 	enum {
215 		ALLOC, FREE,
216 	} status;
217 	size_t locked /** allow recursive locking */;
218 } lock_wrapper;
219 struct lock_unlock_base
220 {
221 	/* Original callbacks */
222 	struct evthread_lock_callbacks cbs;
223 	/* Map of locks */
224 	lock_wrapper *locks;
225 	size_t nr_locks;
226 } lu_base = {
227 	.locks = NULL,
228 };
229 
230 static lock_wrapper *lu_find(void *lock_)
231 {
232 	size_t i;
233 	for (i = 0; i < lu_base.nr_locks; ++i) {
234 		lock_wrapper *lock = &lu_base.locks[i];
235 		if (lock->lock == lock_)
236 			return lock;
237 	}
238 	return NULL;
239 }
240 
241 static void *trace_lock_alloc(unsigned locktype)
242 {
243 	void *lock;
244 	++lu_base.nr_locks;
245 	lu_base.locks = realloc(lu_base.locks,
246 		sizeof(lock_wrapper) * lu_base.nr_locks);
247 	lock = lu_base.cbs.alloc(locktype);
248 	lu_base.locks[lu_base.nr_locks - 1] = (lock_wrapper){ lock, ALLOC, 0 };
249 	return lock;
250 }
251 static void trace_lock_free(void *lock_, unsigned locktype)
252 {
253 	lock_wrapper *lock = lu_find(lock_);
254 	if (!lock || lock->status == FREE || lock->locked) {
255 		TT_FAIL(("lock: free error"));
256 	} else {
257 		lock->status = FREE;
258 		lu_base.cbs.free(lock_, locktype);
259 	}
260 }
261 static int trace_lock_lock(unsigned mode, void *lock_)
262 {
263 	lock_wrapper *lock = lu_find(lock_);
264 	if (!lock || lock->status == FREE) {
265 		TT_FAIL(("lock: lock error"));
266 		return -1;
267 	} else {
268 		++lock->locked;
269 		return lu_base.cbs.lock(mode, lock_);
270 	}
271 }
272 static int trace_lock_unlock(unsigned mode, void *lock_)
273 {
274 	lock_wrapper *lock = lu_find(lock_);
275 	if (!lock || lock->status == FREE || !lock->locked) {
276 		TT_FAIL(("lock: unlock error"));
277 		return -1;
278 	} else {
279 		--lock->locked;
280 		return lu_base.cbs.unlock(mode, lock_);
281 	}
282 }
283 static void lock_unlock_free_thread_cbs(void)
284 {
285 	event_base_free(NULL);
286 
287 	if (libevent_tests_running_in_debug_mode)
288 		libevent_global_shutdown();
289 
290 	/** drop immutable flag */
291 	evthread_set_lock_callbacks(NULL);
292 	/** avoid calling of event_global_setup_locks_() for new cbs */
293 	libevent_global_shutdown();
294 	/** drop immutable flag for non-debug ops (since called after shutdown) */
295 	evthread_set_lock_callbacks(NULL);
296 }
297 
298 static int use_lock_unlock_profiler(void)
299 {
300 	struct evthread_lock_callbacks cbs = {
301 		EVTHREAD_LOCK_API_VERSION,
302 		EVTHREAD_LOCKTYPE_RECURSIVE,
303 		trace_lock_alloc,
304 		trace_lock_free,
305 		trace_lock_lock,
306 		trace_lock_unlock,
307 	};
308 	memcpy(&lu_base.cbs, evthread_get_lock_callbacks(),
309 		sizeof(lu_base.cbs));
310 	{
311 		lock_unlock_free_thread_cbs();
312 
313 		evthread_set_lock_callbacks(&cbs);
314 		/** re-create debug locks correctly */
315 		evthread_enable_lock_debugging();
316 
317 		event_init();
318 	}
319 	return 0;
320 }
321 static void free_lock_unlock_profiler(struct basic_test_data *data)
322 {
323 	/** fix "held_by" for kqueue */
324 	evthread_set_lock_callbacks(NULL);
325 
326 	lock_unlock_free_thread_cbs();
327 	free(lu_base.locks);
328 	data->base = NULL;
329 }
330 
331 static void test_bufferevent_pair_release_lock(void *arg)
332 {
333 	struct basic_test_data *data = arg;
334 	use_lock_unlock_profiler();
335 	{
336 		struct bufferevent *pair[2];
337 		if (!bufferevent_pair_new(NULL, BEV_OPT_THREADSAFE, pair)) {
338 			bufferevent_free(pair[0]);
339 			bufferevent_free(pair[1]);
340 		} else
341 			tt_abort_perror("bufferevent_pair_new");
342 	}
343 	free_lock_unlock_profiler(data);
344 end:
345 	;
346 }
347 #endif
348 
349 /*
350  * test watermarks and bufferevent
351  */
352 
353 static void
354 wm_readcb(struct bufferevent *bev, void *arg)
355 {
356 	struct evbuffer *evbuf = evbuffer_new();
357 	int len = (int)evbuffer_get_length(bev->input);
358 	static int nread;
359 
360 	assert(len >= 10 && len <= 20);
361 
362 	assert(evbuf != NULL);
363 
364 	/* gratuitous test of bufferevent_read_buffer */
365 	bufferevent_read_buffer(bev, evbuf);
366 
367 	nread += len;
368 	if (nread == 65000) {
369 		bufferevent_disable(bev, EV_READ);
370 		test_ok++;
371 	}
372 
373 	evbuffer_free(evbuf);
374 }
375 
376 static void
377 wm_writecb(struct bufferevent *bev, void *arg)
378 {
379 	assert(evbuffer_get_length(bev->output) <= 100);
380 	if (evbuffer_get_length(bev->output) == 0) {
381 		evbuffer_drain(bev->output, evbuffer_get_length(bev->output));
382 		test_ok++;
383 	}
384 }
385 
386 static void
387 wm_errorcb(struct bufferevent *bev, short what, void *arg)
388 {
389 	test_ok = -2;
390 }
391 
392 static void
393 test_bufferevent_watermarks_impl(int use_pair)
394 {
395 	struct bufferevent *bev1 = NULL, *bev2 = NULL;
396 	char buffer[65000];
397 	size_t low, high;
398 	int i;
399 	test_ok = 0;
400 
401 	if (use_pair) {
402 		struct bufferevent *pair[2];
403 		tt_assert(0 == bufferevent_pair_new(NULL, 0, pair));
404 		bev1 = pair[0];
405 		bev2 = pair[1];
406 		bufferevent_setcb(bev1, NULL, wm_writecb, errorcb, NULL);
407 		bufferevent_setcb(bev2, wm_readcb, NULL, errorcb, NULL);
408 	} else {
409 		bev1 = bufferevent_new(pair[0], NULL, wm_writecb, wm_errorcb, NULL);
410 		bev2 = bufferevent_new(pair[1], wm_readcb, NULL, wm_errorcb, NULL);
411 	}
412 	tt_assert(bev1);
413 	tt_assert(bev2);
414 	bufferevent_disable(bev1, EV_READ);
415 	bufferevent_enable(bev2, EV_READ);
416 
417 	/* By default, low watermarks are set to 0 */
418 	bufferevent_getwatermark(bev1, EV_READ, &low, NULL);
419 	tt_int_op(low, ==, 0);
420 	bufferevent_getwatermark(bev2, EV_WRITE, &low, NULL);
421 	tt_int_op(low, ==, 0);
422 
423 	for (i = 0; i < (int)sizeof(buffer); i++)
424 		buffer[i] = (char)i;
425 
426 	/* limit the reading on the receiving bufferevent */
427 	bufferevent_setwatermark(bev2, EV_READ, 10, 20);
428 
429 	bufferevent_getwatermark(bev2, EV_READ, &low, &high);
430 	tt_int_op(low, ==, 10);
431 	tt_int_op(high, ==, 20);
432 
433 	/* Tell the sending bufferevent not to notify us till it's down to
434 	   100 bytes. */
435 	bufferevent_setwatermark(bev1, EV_WRITE, 100, 2000);
436 
437 	bufferevent_getwatermark(bev1, EV_WRITE, &low, &high);
438 	tt_int_op(low, ==, 100);
439 	tt_int_op(high, ==, 2000);
440 
441 	{
442 	int r = bufferevent_getwatermark(bev1, EV_WRITE | EV_READ, &low, &high);
443 	tt_int_op(r, !=, 0);
444 	}
445 
446 	bufferevent_write(bev1, buffer, sizeof(buffer));
447 
448 	event_dispatch();
449 
450 	tt_int_op(test_ok, ==, 2);
451 
452 	/* The write callback drained all the data from outbuf, so we
453 	 * should have removed the write event... */
454 	tt_assert(!event_pending(&bev2->ev_write, EV_WRITE, NULL));
455 
456 end:
457 	if (bev1)
458 		bufferevent_free(bev1);
459 	if (bev2)
460 		bufferevent_free(bev2);
461 }
462 
463 static void
464 test_bufferevent_watermarks(void)
465 {
466 	test_bufferevent_watermarks_impl(0);
467 }
468 
469 static void
470 test_bufferevent_pair_watermarks(void)
471 {
472 	test_bufferevent_watermarks_impl(1);
473 }
474 
475 /*
476  * Test bufferevent filters
477  */
478 
479 /* strip an 'x' from each byte */
480 
481 static enum bufferevent_filter_result
482 bufferevent_input_filter(struct evbuffer *src, struct evbuffer *dst,
483     ev_ssize_t lim, enum bufferevent_flush_mode state, void *ctx)
484 {
485 	const unsigned char *buffer;
486 	unsigned i;
487 
488 	buffer = evbuffer_pullup(src, evbuffer_get_length(src));
489 	for (i = 0; i < evbuffer_get_length(src); i += 2) {
490 		if (buffer[i] == '-')
491 			continue;
492 
493 		assert(buffer[i] == 'x');
494 		evbuffer_add(dst, buffer + i + 1, 1);
495 	}
496 
497 	evbuffer_drain(src, i);
498 	return (BEV_OK);
499 }
500 
501 /* add an 'x' before each byte */
502 
503 static enum bufferevent_filter_result
504 bufferevent_output_filter(struct evbuffer *src, struct evbuffer *dst,
505     ev_ssize_t lim, enum bufferevent_flush_mode state, void *ctx)
506 {
507 	const unsigned char *buffer;
508 	unsigned i;
509 	struct bufferevent **bevp = ctx;
510 
511 	++test_ok;
512 
513 	if (test_ok == 1) {
514 		buffer = evbuffer_pullup(src, evbuffer_get_length(src));
515 		for (i = 0; i < evbuffer_get_length(src); ++i) {
516 			evbuffer_add(dst, "x", 1);
517 			evbuffer_add(dst, buffer + i, 1);
518 		}
519 		evbuffer_drain(src, evbuffer_get_length(src));
520 	} else {
521 		return BEV_ERROR;
522 	}
523 
524 	if (bevp && test_ok == 1) {
525 		int prev = ++test_ok;
526 		bufferevent_write(*bevp, "-", 1);
527 		/* check that during this bufferevent_write()
528 		 * bufferevent_output_filter() will not be called again */
529 		assert(test_ok == prev);
530 		--test_ok;
531 	}
532 
533 	return (BEV_OK);
534 }
535 
536 static void
537 test_bufferevent_filters_impl(int use_pair, int disable)
538 {
539 	struct bufferevent *bev1 = NULL, *bev2 = NULL;
540 	struct bufferevent *bev1_base = NULL, *bev2_base = NULL;
541 	char buffer[8333];
542 	int i;
543 
544 	test_ok = 0;
545 
546 	if (use_pair) {
547 		struct bufferevent *pair[2];
548 		tt_assert(0 == bufferevent_pair_new(NULL, 0, pair));
549 		bev1 = pair[0];
550 		bev2 = pair[1];
551 	} else {
552 		bev1 = bufferevent_socket_new(NULL, pair[0], 0);
553 		bev2 = bufferevent_socket_new(NULL, pair[1], 0);
554 	}
555 	bev1_base = bev1;
556 	bev2_base = bev2;
557 
558 	for (i = 0; i < (int)sizeof(buffer); i++)
559 		buffer[i] = i;
560 
561 	bev1 = bufferevent_filter_new(bev1, NULL, bufferevent_output_filter,
562 				      BEV_OPT_CLOSE_ON_FREE, NULL,
563 					  disable ? &bev1 : NULL);
564 
565 	bev2 = bufferevent_filter_new(bev2, bufferevent_input_filter,
566 				      NULL, BEV_OPT_CLOSE_ON_FREE, NULL, NULL);
567 	bufferevent_setcb(bev1, NULL, writecb, errorcb, NULL);
568 	bufferevent_setcb(bev2, readcb, NULL, errorcb, NULL);
569 
570 	tt_ptr_op(bufferevent_get_underlying(bev1), ==, bev1_base);
571 	tt_ptr_op(bufferevent_get_underlying(bev2), ==, bev2_base);
572 	tt_int_op(bufferevent_getfd(bev1), ==, -1);
573 	tt_int_op(bufferevent_getfd(bev2), ==, -1);
574 
575 	bufferevent_disable(bev1, EV_READ);
576 	bufferevent_enable(bev2, EV_READ);
577 	/* insert some filters */
578 	bufferevent_write(bev1, buffer, sizeof(buffer));
579 
580 	event_dispatch();
581 
582 	if (test_ok != 3 + !!disable)
583 		test_ok = 0;
584 
585 end:
586 	if (bev1)
587 		bufferevent_free(bev1);
588 	if (bev2)
589 		bufferevent_free(bev2);
590 
591 }
592 
593 static void test_bufferevent_filters(void)
594 { test_bufferevent_filters_impl(0, 0); }
595 static void test_bufferevent_pair_filters(void)
596 { test_bufferevent_filters_impl(1, 0); }
597 static void test_bufferevent_filters_disable(void)
598 { test_bufferevent_filters_impl(0, 1); }
599 static void test_bufferevent_pair_filters_disable(void)
600 { test_bufferevent_filters_impl(1, 1); }
601 
602 
603 static void
604 sender_writecb(struct bufferevent *bev, void *ctx)
605 {
606 	if (evbuffer_get_length(bufferevent_get_output(bev)) == 0) {
607 		bufferevent_disable(bev,EV_READ|EV_WRITE);
608 		TT_BLATHER(("Flushed %d: freeing it.", (int)bufferevent_getfd(bev)));
609 		bufferevent_free(bev);
610 	}
611 }
612 
613 static void
614 sender_errorcb(struct bufferevent *bev, short what, void *ctx)
615 {
616 	TT_FAIL(("Got sender error %d",(int)what));
617 }
618 
619 static int bufferevent_connect_test_flags = 0;
620 static int bufferevent_trigger_test_flags = 0;
621 static int n_strings_read = 0;
622 static int n_reads_invoked = 0;
623 static int n_events_invoked = 0;
624 
625 #define TEST_STR "Now is the time for all good events to signal for " \
626 	"the good of their protocol"
627 static void
628 listen_cb(struct evconnlistener *listener, evutil_socket_t fd,
629     struct sockaddr *sa, int socklen, void *arg)
630 {
631 	struct event_base *base = arg;
632 	struct bufferevent *bev;
633 	const char s[] = TEST_STR;
634 	TT_BLATHER(("Got a request on socket %d", (int)fd ));
635 	bev = bufferevent_socket_new(base, fd, bufferevent_connect_test_flags);
636 	tt_assert(bev);
637 	bufferevent_setcb(bev, NULL, sender_writecb, sender_errorcb, NULL);
638 	bufferevent_write(bev, s, sizeof(s));
639 end:
640 	;
641 }
642 
643 static int
644 fake_listener_create(struct sockaddr_in *localhost)
645 {
646 	struct sockaddr *sa = (struct sockaddr *)localhost;
647 	evutil_socket_t fd = -1;
648 	ev_socklen_t slen = sizeof(*localhost);
649 
650 	memset(localhost, 0, sizeof(*localhost));
651 	localhost->sin_port = 0; /* have the kernel pick a port */
652 	localhost->sin_addr.s_addr = htonl(0x7f000001L);
653 	localhost->sin_family = AF_INET;
654 
655 	/* bind, but don't listen or accept. should trigger
656 	   "Connection refused" reliably on most platforms. */
657 	fd = socket(localhost->sin_family, SOCK_STREAM, 0);
658 	tt_assert(fd >= 0);
659 	tt_assert(bind(fd, sa, slen) == 0);
660 	tt_assert(getsockname(fd, sa, &slen) == 0);
661 
662 	return fd;
663 
664 end:
665 	return -1;
666 }
667 
668 static void
669 reader_eventcb(struct bufferevent *bev, short what, void *ctx)
670 {
671 	struct event_base *base = ctx;
672 	if (what & BEV_EVENT_ERROR) {
673 		perror("foobar");
674 		TT_FAIL(("got connector error %d", (int)what));
675 		return;
676 	}
677 	if (what & BEV_EVENT_CONNECTED) {
678 		TT_BLATHER(("connected on %d", (int)bufferevent_getfd(bev)));
679 		bufferevent_enable(bev, EV_READ);
680 	}
681 	if (what & BEV_EVENT_EOF) {
682 		char buf[512];
683 		size_t n;
684 		n = bufferevent_read(bev, buf, sizeof(buf)-1);
685 		tt_int_op(n, >=, 0);
686 		buf[n] = '\0';
687 		tt_str_op(buf, ==, TEST_STR);
688 		if (++n_strings_read == 2)
689 			event_base_loopexit(base, NULL);
690 		TT_BLATHER(("EOF on %d: %d strings read.",
691 			(int)bufferevent_getfd(bev), n_strings_read));
692 	}
693 end:
694 	;
695 }
696 
697 static void
698 reader_eventcb_simple(struct bufferevent *bev, short what, void *ctx)
699 {
700 	TT_BLATHER(("Read eventcb simple invoked on %d.",
701 		(int)bufferevent_getfd(bev)));
702 	n_events_invoked++;
703 }
704 
705 static void
706 reader_readcb(struct bufferevent *bev, void *ctx)
707 {
708 	TT_BLATHER(("Read invoked on %d.", (int)bufferevent_getfd(bev)));
709 	n_reads_invoked++;
710 }
711 
712 static void
713 test_bufferevent_connect(void *arg)
714 {
715 	struct basic_test_data *data = arg;
716 	struct evconnlistener *lev=NULL;
717 	struct bufferevent *bev1=NULL, *bev2=NULL;
718 	struct sockaddr_in localhost;
719 	struct sockaddr_storage ss;
720 	struct sockaddr *sa;
721 	ev_socklen_t slen;
722 
723 	int be_flags=BEV_OPT_CLOSE_ON_FREE;
724 
725 	if (strstr((char*)data->setup_data, "defer")) {
726 		be_flags |= BEV_OPT_DEFER_CALLBACKS;
727 	}
728 	if (strstr((char*)data->setup_data, "unlocked")) {
729 		be_flags |= BEV_OPT_UNLOCK_CALLBACKS;
730 	}
731 	if (strstr((char*)data->setup_data, "lock")) {
732 		be_flags |= BEV_OPT_THREADSAFE;
733 	}
734 	bufferevent_connect_test_flags = be_flags;
735 #ifdef _WIN32
736 	if (!strcmp((char*)data->setup_data, "unset_connectex")) {
737 		struct win32_extension_fns *ext =
738 		    (struct win32_extension_fns *)
739 		    event_get_win32_extension_fns_();
740 		ext->ConnectEx = NULL;
741 	}
742 #endif
743 
744 	memset(&localhost, 0, sizeof(localhost));
745 
746 	localhost.sin_port = 0; /* pick-a-port */
747 	localhost.sin_addr.s_addr = htonl(0x7f000001L);
748 	localhost.sin_family = AF_INET;
749 	sa = (struct sockaddr *)&localhost;
750 	lev = evconnlistener_new_bind(data->base, listen_cb, data->base,
751 	    LEV_OPT_CLOSE_ON_FREE|LEV_OPT_REUSEABLE,
752 	    16, sa, sizeof(localhost));
753 	tt_assert(lev);
754 
755 	sa = (struct sockaddr *)&ss;
756 	slen = sizeof(ss);
757 	if (regress_get_listener_addr(lev, sa, &slen) < 0) {
758 		tt_abort_perror("getsockname");
759 	}
760 
761 	tt_assert(!evconnlistener_enable(lev));
762 	bev1 = bufferevent_socket_new(data->base, -1, be_flags);
763 	bev2 = bufferevent_socket_new(data->base, -1, be_flags);
764 	tt_assert(bev1);
765 	tt_assert(bev2);
766 	bufferevent_setcb(bev1, reader_readcb,NULL, reader_eventcb, data->base);
767 	bufferevent_setcb(bev2, reader_readcb,NULL, reader_eventcb, data->base);
768 
769 	bufferevent_enable(bev1, EV_READ);
770 	bufferevent_enable(bev2, EV_READ);
771 
772 	tt_want(!bufferevent_socket_connect(bev1, sa, sizeof(localhost)));
773 	tt_want(!bufferevent_socket_connect(bev2, sa, sizeof(localhost)));
774 
775 	event_base_dispatch(data->base);
776 
777 	tt_int_op(n_strings_read, ==, 2);
778 	tt_int_op(n_reads_invoked, >=, 2);
779 end:
780 	if (lev)
781 		evconnlistener_free(lev);
782 
783 	if (bev1)
784 		bufferevent_free(bev1);
785 
786 	if (bev2)
787 		bufferevent_free(bev2);
788 }
789 
790 static void
791 test_bufferevent_connect_fail_eventcb(void *arg)
792 {
793 	struct basic_test_data *data = arg;
794 	int flags = BEV_OPT_CLOSE_ON_FREE | (long)data->setup_data;
795 	struct bufferevent *bev = NULL;
796 	struct evconnlistener *lev = NULL;
797 	struct sockaddr_in localhost;
798 	ev_socklen_t slen = sizeof(localhost);
799 	evutil_socket_t fake_listener = -1;
800 
801 	fake_listener = fake_listener_create(&localhost);
802 
803 	tt_int_op(n_events_invoked, ==, 0);
804 
805 	bev = bufferevent_socket_new(data->base, -1, flags);
806 	tt_assert(bev);
807 	bufferevent_setcb(bev, reader_readcb, reader_readcb,
808 		reader_eventcb_simple, data->base);
809 	bufferevent_enable(bev, EV_READ|EV_WRITE);
810 	tt_int_op(n_events_invoked, ==, 0);
811 	tt_int_op(n_reads_invoked, ==, 0);
812 	/** @see also test_bufferevent_connect_fail() */
813 	bufferevent_socket_connect(bev, (struct sockaddr *)&localhost, slen);
814 	tt_int_op(n_events_invoked, ==, 0);
815 	tt_int_op(n_reads_invoked, ==, 0);
816 	event_base_dispatch(data->base);
817 	tt_int_op(n_events_invoked, ==, 1);
818 	tt_int_op(n_reads_invoked, ==, 0);
819 
820 end:
821 	if (lev)
822 		evconnlistener_free(lev);
823 	if (bev)
824 		bufferevent_free(bev);
825 	if (fake_listener >= 0)
826 		evutil_closesocket(fake_listener);
827 }
828 
829 static void
830 want_fail_eventcb(struct bufferevent *bev, short what, void *ctx)
831 {
832 	struct event_base *base = ctx;
833 	const char *err;
834 	evutil_socket_t s;
835 
836 	if (what & BEV_EVENT_ERROR) {
837 		s = bufferevent_getfd(bev);
838 		err = evutil_socket_error_to_string(evutil_socket_geterror(s));
839 		TT_BLATHER(("connection failure on "EV_SOCK_FMT": %s",
840 			EV_SOCK_ARG(s), err));
841 		test_ok = 1;
842 	} else {
843 		TT_FAIL(("didn't fail? what %hd", what));
844 	}
845 
846 	event_base_loopexit(base, NULL);
847 }
848 
849 static void
850 close_socket_cb(evutil_socket_t fd, short what, void *arg)
851 {
852 	evutil_socket_t *fdp = arg;
853 	if (*fdp >= 0) {
854 		evutil_closesocket(*fdp);
855 		*fdp = -1;
856 	}
857 }
858 
859 static void
860 test_bufferevent_connect_fail(void *arg)
861 {
862 	struct basic_test_data *data = (struct basic_test_data *)arg;
863 	struct bufferevent *bev=NULL;
864 	struct event close_listener_event;
865 	int close_listener_event_added = 0;
866 	struct timeval one_second = { 1, 0 };
867 	struct sockaddr_in localhost;
868 	ev_socklen_t slen = sizeof(localhost);
869 	evutil_socket_t fake_listener = -1;
870 	int r;
871 
872 	test_ok = 0;
873 
874 	fake_listener = fake_listener_create(&localhost);
875 	bev = bufferevent_socket_new(data->base, -1,
876 		BEV_OPT_CLOSE_ON_FREE | BEV_OPT_DEFER_CALLBACKS);
877 	tt_assert(bev);
878 	bufferevent_setcb(bev, NULL, NULL, want_fail_eventcb, data->base);
879 
880 	r = bufferevent_socket_connect(bev, (struct sockaddr *)&localhost, slen);
881 	/* XXXX we'd like to test the '0' case everywhere, but FreeBSD tells
882 	 * detects the error immediately, which is not really wrong of it. */
883 	tt_want(r == 0 || r == -1);
884 
885 	/* Close the listener socket after a second. This should trigger
886 	   "connection refused" on some other platforms, including OSX. */
887 	evtimer_assign(&close_listener_event, data->base, close_socket_cb,
888 	    &fake_listener);
889 	event_add(&close_listener_event, &one_second);
890 	close_listener_event_added = 1;
891 
892 	event_base_dispatch(data->base);
893 
894 	tt_int_op(test_ok, ==, 1);
895 
896 end:
897 	if (fake_listener >= 0)
898 		evutil_closesocket(fake_listener);
899 
900 	if (bev)
901 		bufferevent_free(bev);
902 
903 	if (close_listener_event_added)
904 		event_del(&close_listener_event);
905 }
906 
907 struct timeout_cb_result {
908 	struct timeval read_timeout_at;
909 	struct timeval write_timeout_at;
910 	struct timeval last_wrote_at;
911 	int n_read_timeouts;
912 	int n_write_timeouts;
913 	int total_calls;
914 };
915 
916 static void
917 bev_timeout_write_cb(struct bufferevent *bev, void *arg)
918 {
919 	struct timeout_cb_result *res = arg;
920 	evutil_gettimeofday(&res->last_wrote_at, NULL);
921 }
922 
923 static void
924 bev_timeout_event_cb(struct bufferevent *bev, short what, void *arg)
925 {
926 	struct timeout_cb_result *res = arg;
927 	++res->total_calls;
928 
929 	if ((what & (BEV_EVENT_READING|BEV_EVENT_TIMEOUT))
930 	    == (BEV_EVENT_READING|BEV_EVENT_TIMEOUT)) {
931 		evutil_gettimeofday(&res->read_timeout_at, NULL);
932 		++res->n_read_timeouts;
933 	}
934 	if ((what & (BEV_EVENT_WRITING|BEV_EVENT_TIMEOUT))
935 	    == (BEV_EVENT_WRITING|BEV_EVENT_TIMEOUT)) {
936 		evutil_gettimeofday(&res->write_timeout_at, NULL);
937 		++res->n_write_timeouts;
938 	}
939 }
940 
941 static void
942 test_bufferevent_timeouts(void *arg)
943 {
944 	/* "arg" is a string containing "pair" and/or "filter". */
945 	struct bufferevent *bev1 = NULL, *bev2 = NULL;
946 	struct basic_test_data *data = arg;
947 	int use_pair = 0, use_filter = 0;
948 	struct timeval tv_w, tv_r, started_at;
949 	struct timeout_cb_result res1, res2;
950 	char buf[1024];
951 
952 	memset(&res1, 0, sizeof(res1));
953 	memset(&res2, 0, sizeof(res2));
954 
955 	if (strstr((char*)data->setup_data, "pair"))
956 		use_pair = 1;
957 	if (strstr((char*)data->setup_data, "filter"))
958 		use_filter = 1;
959 
960 	if (use_pair) {
961 		struct bufferevent *p[2];
962 		tt_int_op(0, ==, bufferevent_pair_new(data->base, 0, p));
963 		bev1 = p[0];
964 		bev2 = p[1];
965 	} else {
966 		bev1 = bufferevent_socket_new(data->base, data->pair[0], 0);
967 		bev2 = bufferevent_socket_new(data->base, data->pair[1], 0);
968 	}
969 
970 	tt_assert(bev1);
971 	tt_assert(bev2);
972 
973 	if (use_filter) {
974 		struct bufferevent *bevf1, *bevf2;
975 		bevf1 = bufferevent_filter_new(bev1, NULL, NULL,
976 		    BEV_OPT_CLOSE_ON_FREE, NULL, NULL);
977 		bevf2 = bufferevent_filter_new(bev2, NULL, NULL,
978 		    BEV_OPT_CLOSE_ON_FREE, NULL, NULL);
979 		tt_assert(bevf1);
980 		tt_assert(bevf2);
981 		bev1 = bevf1;
982 		bev2 = bevf2;
983 	}
984 
985 	/* Do this nice and early. */
986 	bufferevent_disable(bev2, EV_READ);
987 
988 	/* bev1 will try to write and read.  Both will time out. */
989 	evutil_gettimeofday(&started_at, NULL);
990 	tv_w.tv_sec = tv_r.tv_sec = 0;
991 	tv_w.tv_usec = 100*1000;
992 	tv_r.tv_usec = 150*1000;
993 	bufferevent_setcb(bev1, NULL, bev_timeout_write_cb,
994 	    bev_timeout_event_cb, &res1);
995 	bufferevent_setwatermark(bev1, EV_WRITE, 1024*1024+10, 0);
996 	bufferevent_set_timeouts(bev1, &tv_r, &tv_w);
997 	if (use_pair) {
998 		/* For a pair, the fact that the other side isn't reading
999 		 * makes the writer stall */
1000 		bufferevent_write(bev1, "ABCDEFG", 7);
1001 	} else {
1002 		/* For a real socket, the kernel's TCP buffers can eat a
1003 		 * fair number of bytes; make sure that at some point we
1004 		 * have some bytes that will stall. */
1005 		struct evbuffer *output = bufferevent_get_output(bev1);
1006 		int i;
1007 		memset(buf, 0xbb, sizeof(buf));
1008 		for (i=0;i<1024;++i) {
1009 			evbuffer_add_reference(output, buf, sizeof(buf),
1010 			    NULL, NULL);
1011 		}
1012 	}
1013 	bufferevent_enable(bev1, EV_READ|EV_WRITE);
1014 
1015 	/* bev2 has nothing to say, and isn't listening. */
1016 	bufferevent_setcb(bev2, NULL,  bev_timeout_write_cb,
1017 	    bev_timeout_event_cb, &res2);
1018 	tv_w.tv_sec = tv_r.tv_sec = 0;
1019 	tv_w.tv_usec = 200*1000;
1020 	tv_r.tv_usec = 100*1000;
1021 	bufferevent_set_timeouts(bev2, &tv_r, &tv_w);
1022 	bufferevent_enable(bev2, EV_WRITE);
1023 
1024 	tv_r.tv_sec = 0;
1025 	tv_r.tv_usec = 350000;
1026 
1027 	event_base_loopexit(data->base, &tv_r);
1028 	event_base_dispatch(data->base);
1029 
1030 	/* XXXX Test that actually reading or writing a little resets the
1031 	 * timeouts. */
1032 
1033 	/* Each buf1 timeout happens, and happens only once. */
1034 	tt_want(res1.n_read_timeouts);
1035 	tt_want(res1.n_write_timeouts);
1036 	tt_want(res1.n_read_timeouts == 1);
1037 	tt_want(res1.n_write_timeouts == 1);
1038 
1039 	test_timeval_diff_eq(&started_at, &res1.read_timeout_at, 150);
1040 	test_timeval_diff_eq(&started_at, &res1.write_timeout_at, 100);
1041 
1042 end:
1043 	if (bev1)
1044 		bufferevent_free(bev1);
1045 	if (bev2)
1046 		bufferevent_free(bev2);
1047 }
1048 
1049 static void
1050 trigger_failure_cb(evutil_socket_t fd, short what, void *ctx)
1051 {
1052 	TT_FAIL(("The triggered callback did not fire or the machine is really slow (try increasing timeout)."));
1053 }
1054 
1055 static void
1056 trigger_eventcb(struct bufferevent *bev, short what, void *ctx)
1057 {
1058 	struct event_base *base = ctx;
1059 	if (what == ~0) {
1060 		TT_BLATHER(("Event successfully triggered."));
1061 		event_base_loopexit(base, NULL);
1062 		return;
1063 	}
1064 	reader_eventcb(bev, what, ctx);
1065 }
1066 
1067 static void
1068 trigger_readcb_triggered(struct bufferevent *bev, void *ctx)
1069 {
1070 	TT_BLATHER(("Read successfully triggered."));
1071 	n_reads_invoked++;
1072 	bufferevent_trigger_event(bev, ~0, bufferevent_trigger_test_flags);
1073 }
1074 
1075 static void
1076 trigger_readcb(struct bufferevent *bev, void *ctx)
1077 {
1078 	struct timeval timeout = { 30, 0 };
1079 	struct event_base *base = ctx;
1080 	size_t low, high, len;
1081 	int expected_reads;
1082 
1083 	TT_BLATHER(("Read invoked on %d.", (int)bufferevent_getfd(bev)));
1084 	expected_reads = ++n_reads_invoked;
1085 
1086 	bufferevent_setcb(bev, trigger_readcb_triggered, NULL, trigger_eventcb, ctx);
1087 
1088 	bufferevent_getwatermark(bev, EV_READ, &low, &high);
1089 	len = evbuffer_get_length(bufferevent_get_input(bev));
1090 
1091 	bufferevent_setwatermark(bev, EV_READ, len + 1, 0);
1092 	bufferevent_trigger(bev, EV_READ, bufferevent_trigger_test_flags);
1093 	/* no callback expected */
1094 	tt_int_op(n_reads_invoked, ==, expected_reads);
1095 
1096 	if ((bufferevent_trigger_test_flags & BEV_TRIG_DEFER_CALLBACKS) ||
1097 	    (bufferevent_connect_test_flags & BEV_OPT_DEFER_CALLBACKS)) {
1098 		/* will be deferred */
1099 	} else {
1100 		expected_reads++;
1101 	}
1102 
1103 	event_base_once(base, -1, EV_TIMEOUT, trigger_failure_cb, NULL, &timeout);
1104 
1105 	bufferevent_trigger(bev, EV_READ,
1106 	    bufferevent_trigger_test_flags | BEV_TRIG_IGNORE_WATERMARKS);
1107 	tt_int_op(n_reads_invoked, ==, expected_reads);
1108 
1109 	bufferevent_setwatermark(bev, EV_READ, low, high);
1110 end:
1111 	;
1112 }
1113 
1114 static void
1115 test_bufferevent_trigger(void *arg)
1116 {
1117 	struct basic_test_data *data = arg;
1118 	struct evconnlistener *lev=NULL;
1119 	struct bufferevent *bev=NULL;
1120 	struct sockaddr_in localhost;
1121 	struct sockaddr_storage ss;
1122 	struct sockaddr *sa;
1123 	ev_socklen_t slen;
1124 
1125 	int be_flags=BEV_OPT_CLOSE_ON_FREE;
1126 	int trig_flags=0;
1127 
1128 	if (strstr((char*)data->setup_data, "defer")) {
1129 		be_flags |= BEV_OPT_DEFER_CALLBACKS;
1130 	}
1131 	bufferevent_connect_test_flags = be_flags;
1132 
1133 	if (strstr((char*)data->setup_data, "postpone")) {
1134 		trig_flags |= BEV_TRIG_DEFER_CALLBACKS;
1135 	}
1136 	bufferevent_trigger_test_flags = trig_flags;
1137 
1138 	memset(&localhost, 0, sizeof(localhost));
1139 
1140 	localhost.sin_port = 0; /* pick-a-port */
1141 	localhost.sin_addr.s_addr = htonl(0x7f000001L);
1142 	localhost.sin_family = AF_INET;
1143 	sa = (struct sockaddr *)&localhost;
1144 	lev = evconnlistener_new_bind(data->base, listen_cb, data->base,
1145 	    LEV_OPT_CLOSE_ON_FREE|LEV_OPT_REUSEABLE,
1146 	    16, sa, sizeof(localhost));
1147 	tt_assert(lev);
1148 
1149 	sa = (struct sockaddr *)&ss;
1150 	slen = sizeof(ss);
1151 	if (regress_get_listener_addr(lev, sa, &slen) < 0) {
1152 		tt_abort_perror("getsockname");
1153 	}
1154 
1155 	tt_assert(!evconnlistener_enable(lev));
1156 	bev = bufferevent_socket_new(data->base, -1, be_flags);
1157 	tt_assert(bev);
1158 	bufferevent_setcb(bev, trigger_readcb, NULL, trigger_eventcb, data->base);
1159 
1160 	bufferevent_enable(bev, EV_READ);
1161 
1162 	tt_want(!bufferevent_socket_connect(bev, sa, sizeof(localhost)));
1163 
1164 	event_base_dispatch(data->base);
1165 
1166 	tt_int_op(n_reads_invoked, ==, 2);
1167 end:
1168 	if (lev)
1169 		evconnlistener_free(lev);
1170 
1171 	if (bev)
1172 		bufferevent_free(bev);
1173 }
1174 
1175 static void
1176 test_bufferevent_socket_filter_inactive(void *arg)
1177 {
1178 	struct basic_test_data *data = arg;
1179 	struct bufferevent *bev = NULL, *bevf = NULL;
1180 
1181 	bev = bufferevent_socket_new(data->base, -1, 0);
1182 	tt_assert(bev);
1183 	bevf = bufferevent_filter_new(bev, NULL, NULL, 0, NULL, NULL);
1184 	tt_assert(bevf);
1185 
1186 end:
1187 	if (bevf)
1188 		bufferevent_free(bevf);
1189 	if (bev)
1190 		bufferevent_free(bev);
1191 }
1192 
1193 static void
1194 pair_flush_eventcb(struct bufferevent *bev, short what, void *ctx)
1195 {
1196 	int *callback_what = ctx;
1197 	*callback_what = what;
1198 }
1199 
1200 static void
1201 test_bufferevent_pair_flush(void *arg)
1202 {
1203 	struct basic_test_data *data = arg;
1204 	struct bufferevent *pair[2];
1205 	struct bufferevent *bev1 = NULL;
1206 	struct bufferevent *bev2 = NULL;
1207 	int callback_what = 0;
1208 
1209 	tt_assert(0 == bufferevent_pair_new(data->base, 0, pair));
1210 	bev1 = pair[0];
1211 	bev2 = pair[1];
1212 	tt_assert(0 == bufferevent_enable(bev1, EV_WRITE));
1213 	tt_assert(0 == bufferevent_enable(bev2, EV_READ));
1214 
1215 	bufferevent_setcb(bev2, NULL, NULL, pair_flush_eventcb, &callback_what);
1216 
1217 	bufferevent_flush(bev1, EV_WRITE, BEV_FINISHED);
1218 
1219 	event_base_loop(data->base, EVLOOP_ONCE);
1220 
1221 	tt_assert(callback_what == (BEV_EVENT_READING | BEV_EVENT_EOF));
1222 
1223 end:
1224 	if (bev1)
1225 		bufferevent_free(bev1);
1226 	if (bev2)
1227 		bufferevent_free(bev2);
1228 }
1229 
1230 struct bufferevent_filter_data_stuck {
1231 	size_t header_size;
1232 	size_t total_read;
1233 };
1234 
1235 static void
1236 bufferevent_filter_data_stuck_readcb(struct bufferevent *bev, void *arg)
1237 {
1238 	struct bufferevent_filter_data_stuck *filter_data = arg;
1239 	struct evbuffer *input = bufferevent_get_input(bev);
1240 	size_t read_size = evbuffer_get_length(input);
1241 	evbuffer_drain(input, read_size);
1242 	filter_data->total_read += read_size;
1243 }
1244 
1245 /**
1246  * This filter prepends header once before forwarding data.
1247  */
1248 static enum bufferevent_filter_result
1249 bufferevent_filter_data_stuck_inputcb(
1250     struct evbuffer *src, struct evbuffer *dst, ev_ssize_t dst_limit,
1251     enum bufferevent_flush_mode mode, void *ctx)
1252 {
1253 	struct bufferevent_filter_data_stuck *filter_data = ctx;
1254 	static int header_inserted = 0;
1255 	size_t payload_size;
1256 	size_t header_size = 0;
1257 
1258 	if (!header_inserted) {
1259 		char *header = calloc(filter_data->header_size, 1);
1260 		evbuffer_add(dst, header, filter_data->header_size);
1261 		free(header);
1262 		header_size = filter_data->header_size;
1263 		header_inserted = 1;
1264 	}
1265 
1266 	payload_size = evbuffer_get_length(src);
1267 	if (payload_size > dst_limit - header_size) {
1268 		payload_size = dst_limit - header_size;
1269 	}
1270 
1271 	tt_int_op(payload_size, ==, evbuffer_remove_buffer(src, dst, payload_size));
1272 
1273 end:
1274 	return BEV_OK;
1275 }
1276 
1277 static void
1278 test_bufferevent_filter_data_stuck(void *arg)
1279 {
1280 	const size_t read_high_wm = 4096;
1281 	struct bufferevent_filter_data_stuck filter_data;
1282 	struct basic_test_data *data = arg;
1283 	struct bufferevent *pair[2];
1284 	struct bufferevent *filter = NULL;
1285 
1286 	int options = BEV_OPT_CLOSE_ON_FREE | BEV_OPT_DEFER_CALLBACKS;
1287 
1288 	char payload[4096];
1289 	int payload_size = sizeof(payload);
1290 
1291 	memset(&filter_data, 0, sizeof(filter_data));
1292 	filter_data.header_size = 20;
1293 
1294 	tt_assert(bufferevent_pair_new(data->base, options, pair) == 0);
1295 
1296 	bufferevent_setwatermark(pair[0], EV_READ, 0, read_high_wm);
1297 	bufferevent_setwatermark(pair[1], EV_READ, 0, read_high_wm);
1298 
1299 	tt_assert(
1300 		filter =
1301 		 bufferevent_filter_new(pair[1],
1302 		 bufferevent_filter_data_stuck_inputcb,
1303 		 NULL,
1304 		 options,
1305 		 NULL,
1306 		 &filter_data));
1307 
1308 	bufferevent_setcb(filter,
1309 		bufferevent_filter_data_stuck_readcb,
1310 		NULL,
1311 		NULL,
1312 		&filter_data);
1313 
1314 	tt_assert(bufferevent_enable(filter, EV_READ|EV_WRITE) == 0);
1315 
1316 	bufferevent_setwatermark(filter, EV_READ, 0, read_high_wm);
1317 
1318 	tt_assert(bufferevent_write(pair[0], payload, sizeof(payload)) == 0);
1319 
1320 	event_base_dispatch(data->base);
1321 
1322 	tt_int_op(filter_data.total_read, ==, payload_size + filter_data.header_size);
1323 end:
1324 	if (pair[0])
1325 		bufferevent_free(pair[0]);
1326 	if (filter)
1327 		bufferevent_free(filter);
1328 }
1329 
1330 struct testcase_t bufferevent_testcases[] = {
1331 
1332 	LEGACY(bufferevent, TT_ISOLATED),
1333 	LEGACY(bufferevent_pair, TT_ISOLATED),
1334 	LEGACY(bufferevent_flush_normal, TT_ISOLATED),
1335 	LEGACY(bufferevent_flush_flush, TT_ISOLATED),
1336 	LEGACY(bufferevent_flush_finished, TT_ISOLATED),
1337 	LEGACY(bufferevent_pair_flush_normal, TT_ISOLATED),
1338 	LEGACY(bufferevent_pair_flush_flush, TT_ISOLATED),
1339 	LEGACY(bufferevent_pair_flush_finished, TT_ISOLATED),
1340 #if defined(EVTHREAD_USE_PTHREADS_IMPLEMENTED)
1341 	{ "bufferevent_pair_release_lock", test_bufferevent_pair_release_lock,
1342 	  TT_FORK|TT_ISOLATED|TT_NEED_THREADS|TT_NEED_BASE|TT_LEGACY,
1343 	  &basic_setup, NULL },
1344 #endif
1345 	LEGACY(bufferevent_watermarks, TT_ISOLATED),
1346 	LEGACY(bufferevent_pair_watermarks, TT_ISOLATED),
1347 	LEGACY(bufferevent_filters, TT_ISOLATED),
1348 	LEGACY(bufferevent_pair_filters, TT_ISOLATED),
1349 	LEGACY(bufferevent_filters_disable, TT_ISOLATED),
1350 	LEGACY(bufferevent_pair_filters_disable, TT_ISOLATED),
1351 	{ "bufferevent_connect", test_bufferevent_connect, TT_FORK|TT_NEED_BASE,
1352 	  &basic_setup, (void*)"" },
1353 	{ "bufferevent_connect_defer", test_bufferevent_connect,
1354 	  TT_FORK|TT_NEED_BASE, &basic_setup, (void*)"defer" },
1355 	{ "bufferevent_connect_lock", test_bufferevent_connect,
1356 	  TT_FORK|TT_NEED_BASE|TT_NEED_THREADS, &basic_setup, (void*)"lock" },
1357 	{ "bufferevent_connect_lock_defer", test_bufferevent_connect,
1358 	  TT_FORK|TT_NEED_BASE|TT_NEED_THREADS, &basic_setup,
1359 	  (void*)"defer lock" },
1360 	{ "bufferevent_connect_unlocked_cbs", test_bufferevent_connect,
1361 	  TT_FORK|TT_NEED_BASE|TT_NEED_THREADS, &basic_setup,
1362 	  (void*)"lock defer unlocked" },
1363 	{ "bufferevent_connect_fail", test_bufferevent_connect_fail,
1364 	  TT_FORK|TT_NEED_BASE, &basic_setup, NULL },
1365 	{ "bufferevent_timeout", test_bufferevent_timeouts,
1366 	  TT_FORK|TT_NEED_BASE|TT_NEED_SOCKETPAIR, &basic_setup, (void*)"" },
1367 	{ "bufferevent_timeout_pair", test_bufferevent_timeouts,
1368 	  TT_FORK|TT_NEED_BASE, &basic_setup, (void*)"pair" },
1369 	{ "bufferevent_timeout_filter", test_bufferevent_timeouts,
1370 	  TT_FORK|TT_NEED_BASE, &basic_setup, (void*)"filter" },
1371 	{ "bufferevent_timeout_filter_pair", test_bufferevent_timeouts,
1372 	  TT_FORK|TT_NEED_BASE, &basic_setup, (void*)"filter pair" },
1373 	{ "bufferevent_trigger", test_bufferevent_trigger, TT_FORK|TT_NEED_BASE,
1374 	  &basic_setup, (void*)"" },
1375 	{ "bufferevent_trigger_defer", test_bufferevent_trigger,
1376 	  TT_FORK|TT_NEED_BASE, &basic_setup, (void*)"defer" },
1377 	{ "bufferevent_trigger_postpone", test_bufferevent_trigger,
1378 	  TT_FORK|TT_NEED_BASE|TT_NEED_THREADS, &basic_setup,
1379 	  (void*)"postpone" },
1380 	{ "bufferevent_trigger_defer_postpone", test_bufferevent_trigger,
1381 	  TT_FORK|TT_NEED_BASE|TT_NEED_THREADS, &basic_setup,
1382 	  (void*)"defer postpone" },
1383 #ifdef EVENT__HAVE_LIBZ
1384 	LEGACY(bufferevent_zlib, TT_ISOLATED),
1385 #else
1386 	{ "bufferevent_zlib", NULL, TT_SKIP, NULL, NULL },
1387 #endif
1388 
1389 	{ "bufferevent_connect_fail_eventcb_defer",
1390 	  test_bufferevent_connect_fail_eventcb,
1391 	  TT_FORK|TT_NEED_BASE, &basic_setup, (void*)BEV_OPT_DEFER_CALLBACKS },
1392 	{ "bufferevent_connect_fail_eventcb",
1393 	  test_bufferevent_connect_fail_eventcb,
1394 	  TT_FORK|TT_NEED_BASE, &basic_setup, NULL },
1395 
1396 	{ "bufferevent_socket_filter_inactive",
1397 	  test_bufferevent_socket_filter_inactive,
1398 	  TT_FORK|TT_NEED_BASE, &basic_setup, NULL },
1399 	{ "bufferevent_pair_flush",
1400 	  test_bufferevent_pair_flush,
1401 	  TT_FORK|TT_NEED_BASE, &basic_setup, NULL },
1402 	{ "bufferevent_filter_data_stuck",
1403 	  test_bufferevent_filter_data_stuck,
1404 	  TT_FORK|TT_NEED_BASE, &basic_setup, NULL },
1405 
1406 	END_OF_TESTCASES,
1407 };
1408 
1409 struct testcase_t bufferevent_iocp_testcases[] = {
1410 
1411 	LEGACY(bufferevent, TT_ISOLATED|TT_ENABLE_IOCP),
1412 	LEGACY(bufferevent_flush_normal, TT_ISOLATED),
1413 	LEGACY(bufferevent_flush_flush, TT_ISOLATED),
1414 	LEGACY(bufferevent_flush_finished, TT_ISOLATED),
1415 	LEGACY(bufferevent_watermarks, TT_ISOLATED|TT_ENABLE_IOCP),
1416 	LEGACY(bufferevent_filters, TT_ISOLATED|TT_ENABLE_IOCP),
1417 	LEGACY(bufferevent_filters_disable, TT_ISOLATED|TT_ENABLE_IOCP),
1418 	{ "bufferevent_connect", test_bufferevent_connect,
1419 	  TT_FORK|TT_NEED_BASE|TT_ENABLE_IOCP, &basic_setup, (void*)"" },
1420 	{ "bufferevent_connect_defer", test_bufferevent_connect,
1421 	  TT_FORK|TT_NEED_BASE|TT_ENABLE_IOCP, &basic_setup, (void*)"defer" },
1422 	{ "bufferevent_connect_lock", test_bufferevent_connect,
1423 	  TT_FORK|TT_NEED_BASE|TT_NEED_THREADS|TT_ENABLE_IOCP, &basic_setup,
1424 	  (void*)"lock" },
1425 	{ "bufferevent_connect_lock_defer", test_bufferevent_connect,
1426 	  TT_FORK|TT_NEED_BASE|TT_NEED_THREADS|TT_ENABLE_IOCP, &basic_setup,
1427 	  (void*)"defer lock" },
1428 	{ "bufferevent_connect_fail", test_bufferevent_connect_fail,
1429 	  TT_FORK|TT_NEED_BASE|TT_ENABLE_IOCP, &basic_setup, NULL },
1430 	{ "bufferevent_connect_nonblocking", test_bufferevent_connect,
1431 	  TT_FORK|TT_NEED_BASE|TT_ENABLE_IOCP, &basic_setup,
1432 	  (void*)"unset_connectex" },
1433 
1434 	{ "bufferevent_connect_fail_eventcb_defer",
1435 	  test_bufferevent_connect_fail_eventcb,
1436 	  TT_FORK|TT_NEED_BASE|TT_ENABLE_IOCP, &basic_setup,
1437 	  (void*)BEV_OPT_DEFER_CALLBACKS },
1438 	{ "bufferevent_connect_fail_eventcb",
1439 	  test_bufferevent_connect_fail_eventcb,
1440 	  TT_FORK|TT_NEED_BASE|TT_ENABLE_IOCP, &basic_setup, NULL },
1441 
1442 	END_OF_TESTCASES,
1443 };
1444