michael@0: /*
michael@0:  * Copyright (c) 2009-2012 Niels Provos and Nick Mathewson
michael@0:  *
michael@0:  * Redistribution and use in source and binary forms, with or without
michael@0:  * modification, are permitted provided that the following conditions
michael@0:  * are met:
michael@0:  * 1. Redistributions of source code must retain the above copyright
michael@0:  *    notice, this list of conditions and the following disclaimer.
michael@0:  * 2. Redistributions in binary form must reproduce the above copyright
michael@0:  *    notice, this list of conditions and the following disclaimer in the
michael@0:  *    documentation and/or other materials provided with the distribution.
michael@0:  * 3. The name of the author may not be used to endorse or promote products
michael@0:  *    derived from this software without specific prior written permission.
michael@0:  *
michael@0:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
michael@0:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
michael@0:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
michael@0:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
michael@0:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
michael@0:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
michael@0:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
michael@0:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
michael@0:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
michael@0:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
michael@0:  */
michael@0: #include "../util-internal.h"
michael@0: #include "event2/event-config.h"
michael@0: 
michael@0: #ifdef WIN32
michael@0: #include <winsock2.h>
michael@0: #endif
michael@0: #include <sys/types.h>
michael@0: #include <sys/stat.h>
michael@0: #ifdef _EVENT_HAVE_SYS_SOCKET_H
michael@0: #include <sys/socket.h>
michael@0: #endif
michael@0: #include <fcntl.h>
michael@0: #include <stdlib.h>
michael@0: #include <stdio.h>
michael@0: #include <string.h>
michael@0: #ifndef WIN32
michael@0: #include <sys/time.h>
michael@0: #include <unistd.h>
michael@0: #endif
michael@0: #include <errno.h>
michael@0: 
michael@0: #include "event2/event.h"
michael@0: #include "event2/util.h"
michael@0: 
michael@0: #include "regress.h"
michael@0: 
michael@0: static int was_et = 0;
michael@0: 
michael@0: static void
michael@0: read_cb(evutil_socket_t fd, short event, void *arg)
michael@0: {
michael@0: 	char buf;
michael@0: 	int len;
michael@0: 
michael@0: 	len = recv(fd, &buf, sizeof(buf), 0);
michael@0: 
michael@0: 	called++;
michael@0: 	if (event & EV_ET)
michael@0: 		was_et = 1;
michael@0: 
michael@0: 	if (!len)
michael@0: 		event_del(arg);
michael@0: }
michael@0: 
michael@0: #ifndef SHUT_WR
michael@0: #define SHUT_WR 1
michael@0: #endif
michael@0: 
michael@0: #ifdef WIN32
michael@0: #define LOCAL_SOCKETPAIR_AF AF_INET
michael@0: #else
michael@0: #define LOCAL_SOCKETPAIR_AF AF_UNIX
michael@0: #endif
michael@0: 
michael@0: static void
michael@0: test_edgetriggered(void *et)
michael@0: {
michael@0: 	struct event *ev = NULL;
michael@0: 	struct event_base *base = NULL;
michael@0: 	const char *test = "test string";
michael@0: 	evutil_socket_t pair[2] = {-1,-1};
michael@0: 	int supports_et;
michael@0: 
michael@0: 	/* On Linux 3.2.1 (at least, as patched by Fedora and tested by Nick),
michael@0: 	 * doing a "recv" on an AF_UNIX socket resets the readability of the
michael@0: 	 * socket, even though there is no state change, so we don't actually
michael@0: 	 * get edge-triggered behavior.  Yuck!  Linux 3.1.9 didn't have this
michael@0: 	 * problem.
michael@0: 	 */
michael@0: #ifdef __linux__
michael@0: 	if (evutil_ersatz_socketpair(AF_INET, SOCK_STREAM, 0, pair) == -1) {
michael@0: 		tt_abort_perror("socketpair");
michael@0: 	}
michael@0: #else
michael@0: 	if (evutil_socketpair(LOCAL_SOCKETPAIR_AF, SOCK_STREAM, 0, pair) == -1) {
michael@0: 		tt_abort_perror("socketpair");
michael@0: 	}
michael@0: #endif
michael@0: 
michael@0: 	called = was_et = 0;
michael@0: 
michael@0: 	tt_int_op(send(pair[0], test, (int)strlen(test)+1, 0), >, 0);
michael@0: 	shutdown(pair[0], SHUT_WR);
michael@0: 
michael@0: 	/* Initalize the event library */
michael@0: 	base = event_base_new();
michael@0: 
michael@0: 	if (!strcmp(event_base_get_method(base), "epoll") ||
michael@0: 	    !strcmp(event_base_get_method(base), "epoll (with changelist)") ||
michael@0: 	    !strcmp(event_base_get_method(base), "kqueue"))
michael@0: 		supports_et = 1;
michael@0: 	else
michael@0: 		supports_et = 0;
michael@0: 
michael@0: 	TT_BLATHER(("Checking for edge-triggered events with %s, which should %s"
michael@0: 				"support edge-triggering", event_base_get_method(base),
michael@0: 				supports_et?"":"not "));
michael@0: 
michael@0: 	/* Initalize one event */
michael@0: 	ev = event_new(base, pair[1], EV_READ|EV_ET|EV_PERSIST, read_cb, &ev);
michael@0: 
michael@0: 	event_add(ev, NULL);
michael@0: 
michael@0: 	/* We're going to call the dispatch function twice.  The first invocation
michael@0: 	 * will read a single byte from pair[1] in either case.  If we're edge
michael@0: 	 * triggered, we'll only see the event once (since we only see transitions
michael@0: 	 * from no data to data), so the second invocation of event_base_loop will
michael@0: 	 * do nothing.  If we're level triggered, the second invocation of
michael@0: 	 * event_base_loop will also activate the event (because there's still
michael@0: 	 * data to read). */
michael@0: 	event_base_loop(base,EVLOOP_NONBLOCK|EVLOOP_ONCE);
michael@0: 	event_base_loop(base,EVLOOP_NONBLOCK|EVLOOP_ONCE);
michael@0: 
michael@0: 	if (supports_et) {
michael@0: 		tt_int_op(called, ==, 1);
michael@0: 		tt_assert(was_et);
michael@0: 	} else {
michael@0: 		tt_int_op(called, ==, 2);
michael@0: 		tt_assert(!was_et);
michael@0: 	}
michael@0: 
michael@0:  end:
michael@0: 	if (ev) {
michael@0: 		event_del(ev);
michael@0: 		event_free(ev);
michael@0: 	}
michael@0: 	if (base)
michael@0: 		event_base_free(base);
michael@0: 	evutil_closesocket(pair[0]);
michael@0: 	evutil_closesocket(pair[1]);
michael@0: }
michael@0: 
michael@0: static void
michael@0: test_edgetriggered_mix_error(void *data_)
michael@0: {
michael@0: 	struct basic_test_data *data = data_;
michael@0: 	struct event_base *base = NULL;
michael@0: 	struct event *ev_et=NULL, *ev_lt=NULL;
michael@0: 
michael@0: #ifdef _EVENT_DISABLE_DEBUG_MODE
michael@0: 	if (1)
michael@0: 		tt_skip();
michael@0: #endif
michael@0: 
michael@0: 	event_enable_debug_mode();
michael@0: 
michael@0: 	base = event_base_new();
michael@0: 
michael@0: 	/* try mixing edge-triggered and level-triggered to make sure it fails*/
michael@0: 	ev_et = event_new(base, data->pair[0], EV_READ|EV_ET, read_cb, ev_et);
michael@0: 	tt_assert(ev_et);
michael@0: 	ev_lt = event_new(base, data->pair[0], EV_READ, read_cb, ev_lt);
michael@0: 	tt_assert(ev_lt);
michael@0: 
michael@0: 	/* Add edge-triggered, then level-triggered.  Get an error. */
michael@0: 	tt_int_op(0, ==, event_add(ev_et, NULL));
michael@0: 	tt_int_op(-1, ==, event_add(ev_lt, NULL));
michael@0: 	tt_int_op(EV_READ, ==, event_pending(ev_et, EV_READ, NULL));
michael@0: 	tt_int_op(0, ==, event_pending(ev_lt, EV_READ, NULL));
michael@0: 
michael@0: 	tt_int_op(0, ==, event_del(ev_et));
michael@0: 	/* Add level-triggered, then edge-triggered.  Get an error. */
michael@0: 	tt_int_op(0, ==, event_add(ev_lt, NULL));
michael@0: 	tt_int_op(-1, ==, event_add(ev_et, NULL));
michael@0: 	tt_int_op(EV_READ, ==, event_pending(ev_lt, EV_READ, NULL));
michael@0: 	tt_int_op(0, ==, event_pending(ev_et, EV_READ, NULL));
michael@0: 
michael@0: end:
michael@0: 	if (ev_et)
michael@0: 		event_free(ev_et);
michael@0: 	if (ev_lt)
michael@0: 		event_free(ev_lt);
michael@0: 	if (base)
michael@0: 		event_base_free(base);
michael@0: }
michael@0: 
michael@0: struct testcase_t edgetriggered_testcases[] = {
michael@0: 	{ "et", test_edgetriggered, TT_FORK, NULL, NULL },
michael@0: 	{ "et_mix_error", test_edgetriggered_mix_error,
michael@0: 	  TT_FORK|TT_NEED_SOCKETPAIR|TT_NO_LOGS, &basic_setup, NULL },
michael@0: 	END_OF_TESTCASES
michael@0: };