2 * Copyright (c) 2009-2012 Niels Provos and Nick Mathewson
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. The name of the author may not be used to endorse or promote products
13 * derived from this software without specific prior written permission.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 #include "../util-internal.h"
27 #include "event2/event-config.h"
32 #include <sys/types.h>
34 #ifdef EVENT__HAVE_SYS_SOCKET_H
35 #include <sys/socket.h>
47 #include "event2/event.h"
48 #include "event2/util.h"
52 static int was_et = 0;
55 read_cb(evutil_socket_t fd, short event, void *arg)
60 len = recv(fd, &buf, sizeof(buf), 0);
75 #define LOCAL_SOCKETPAIR_AF AF_INET
77 #define LOCAL_SOCKETPAIR_AF AF_UNIX
81 test_edgetriggered(void *et)
83 struct event *ev = NULL;
84 struct event_base *base = NULL;
85 const char *test = "test string";
86 evutil_socket_t pair[2] = {-1,-1};
89 /* On Linux 3.2.1 (at least, as patched by Fedora and tested by Nick),
90 * doing a "recv" on an AF_UNIX socket resets the readability of the
91 * socket, even though there is no state change, so we don't actually
92 * get edge-triggered behavior. Yuck! Linux 3.1.9 didn't have this
96 if (evutil_ersatz_socketpair_(AF_INET, SOCK_STREAM, 0, pair) == -1) {
97 tt_abort_perror("socketpair");
100 if (evutil_socketpair(LOCAL_SOCKETPAIR_AF, SOCK_STREAM, 0, pair) == -1) {
101 tt_abort_perror("socketpair");
107 tt_int_op(send(pair[0], test, (int)strlen(test)+1, 0), >, 0);
108 shutdown(pair[0], SHUT_WR);
110 /* Initalize the event library */
111 base = event_base_new();
113 if (!strcmp(event_base_get_method(base), "epoll") ||
114 !strcmp(event_base_get_method(base), "epoll (with changelist)") ||
115 !strcmp(event_base_get_method(base), "kqueue"))
120 TT_BLATHER(("Checking for edge-triggered events with %s, which should %s"
121 "support edge-triggering", event_base_get_method(base),
122 supports_et?"":"not "));
124 /* Initalize one event */
125 ev = event_new(base, pair[1], EV_READ|EV_ET|EV_PERSIST, read_cb, &ev);
129 /* We're going to call the dispatch function twice. The first invocation
130 * will read a single byte from pair[1] in either case. If we're edge
131 * triggered, we'll only see the event once (since we only see transitions
132 * from no data to data), so the second invocation of event_base_loop will
133 * do nothing. If we're level triggered, the second invocation of
134 * event_base_loop will also activate the event (because there's still
136 event_base_loop(base,EVLOOP_NONBLOCK|EVLOOP_ONCE);
137 event_base_loop(base,EVLOOP_NONBLOCK|EVLOOP_ONCE);
140 tt_int_op(called, ==, 1);
143 tt_int_op(called, ==, 2);
153 event_base_free(base);
154 evutil_closesocket(pair[0]);
155 evutil_closesocket(pair[1]);
159 test_edgetriggered_mix_error(void *data_)
161 struct basic_test_data *data = data_;
162 struct event_base *base = NULL;
163 struct event *ev_et=NULL, *ev_lt=NULL;
165 #ifdef EVENT__DISABLE_DEBUG_MODE
170 if (!libevent_tests_running_in_debug_mode)
171 event_enable_debug_mode();
173 base = event_base_new();
175 /* try mixing edge-triggered and level-triggered to make sure it fails*/
176 ev_et = event_new(base, data->pair[0], EV_READ|EV_ET, read_cb, ev_et);
178 ev_lt = event_new(base, data->pair[0], EV_READ, read_cb, ev_lt);
181 /* Add edge-triggered, then level-triggered. Get an error. */
182 tt_int_op(0, ==, event_add(ev_et, NULL));
183 tt_int_op(-1, ==, event_add(ev_lt, NULL));
184 tt_int_op(EV_READ, ==, event_pending(ev_et, EV_READ, NULL));
185 tt_int_op(0, ==, event_pending(ev_lt, EV_READ, NULL));
187 tt_int_op(0, ==, event_del(ev_et));
188 /* Add level-triggered, then edge-triggered. Get an error. */
189 tt_int_op(0, ==, event_add(ev_lt, NULL));
190 tt_int_op(-1, ==, event_add(ev_et, NULL));
191 tt_int_op(EV_READ, ==, event_pending(ev_lt, EV_READ, NULL));
192 tt_int_op(0, ==, event_pending(ev_et, EV_READ, NULL));
200 event_base_free(base);
203 struct testcase_t edgetriggered_testcases[] = {
204 { "et", test_edgetriggered, TT_FORK, NULL, NULL },
205 { "et_mix_error", test_edgetriggered_mix_error,
206 TT_FORK|TT_NEED_SOCKETPAIR|TT_NO_LOGS, &basic_setup, NULL },