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);
71 #define LOCAL_SOCKETPAIR_AF AF_INET
73 #define LOCAL_SOCKETPAIR_AF AF_UNIX
77 test_edgetriggered(void *et)
79 struct event *ev = NULL;
80 struct event_base *base = NULL;
81 const char *test = "test string";
82 evutil_socket_t pair[2] = {-1,-1};
85 /* On Linux 3.2.1 (at least, as patched by Fedora and tested by Nick),
86 * doing a "recv" on an AF_UNIX socket resets the readability of the
87 * socket, even though there is no state change, so we don't actually
88 * get edge-triggered behavior. Yuck! Linux 3.1.9 didn't have this
92 if (evutil_ersatz_socketpair_(AF_INET, SOCK_STREAM, 0, pair) == -1) {
93 tt_abort_perror("socketpair");
96 if (evutil_socketpair(LOCAL_SOCKETPAIR_AF, SOCK_STREAM, 0, pair) == -1) {
97 tt_abort_perror("socketpair");
103 tt_int_op(send(pair[0], test, (int)strlen(test)+1, 0), >, 0);
104 shutdown(pair[0], EVUTIL_SHUT_WR);
106 /* Initalize the event library */
107 base = event_base_new();
109 if (!strcmp(event_base_get_method(base), "epoll") ||
110 !strcmp(event_base_get_method(base), "epoll (with changelist)") ||
111 !strcmp(event_base_get_method(base), "kqueue"))
116 TT_BLATHER(("Checking for edge-triggered events with %s, which should %s"
117 "support edge-triggering", event_base_get_method(base),
118 supports_et?"":"not "));
120 /* Initalize one event */
121 ev = event_new(base, pair[1], EV_READ|EV_ET|EV_PERSIST, read_cb, &ev);
125 /* We're going to call the dispatch function twice. The first invocation
126 * will read a single byte from pair[1] in either case. If we're edge
127 * triggered, we'll only see the event once (since we only see transitions
128 * from no data to data), so the second invocation of event_base_loop will
129 * do nothing. If we're level triggered, the second invocation of
130 * event_base_loop will also activate the event (because there's still
132 event_base_loop(base,EVLOOP_NONBLOCK|EVLOOP_ONCE);
133 event_base_loop(base,EVLOOP_NONBLOCK|EVLOOP_ONCE);
136 tt_int_op(called, ==, 1);
139 tt_int_op(called, ==, 2);
149 event_base_free(base);
150 evutil_closesocket(pair[0]);
151 evutil_closesocket(pair[1]);
155 test_edgetriggered_mix_error(void *data_)
157 struct basic_test_data *data = data_;
158 struct event_base *base = NULL;
159 struct event *ev_et=NULL, *ev_lt=NULL;
161 #ifdef EVENT__DISABLE_DEBUG_MODE
166 if (!libevent_tests_running_in_debug_mode)
167 event_enable_debug_mode();
169 base = event_base_new();
171 /* try mixing edge-triggered and level-triggered to make sure it fails*/
172 ev_et = event_new(base, data->pair[0], EV_READ|EV_ET, read_cb, ev_et);
174 ev_lt = event_new(base, data->pair[0], EV_READ, read_cb, ev_lt);
177 /* Add edge-triggered, then level-triggered. Get an error. */
178 tt_int_op(0, ==, event_add(ev_et, NULL));
179 tt_int_op(-1, ==, event_add(ev_lt, NULL));
180 tt_int_op(EV_READ, ==, event_pending(ev_et, EV_READ, NULL));
181 tt_int_op(0, ==, event_pending(ev_lt, EV_READ, NULL));
183 tt_int_op(0, ==, event_del(ev_et));
184 /* Add level-triggered, then edge-triggered. Get an error. */
185 tt_int_op(0, ==, event_add(ev_lt, NULL));
186 tt_int_op(-1, ==, event_add(ev_et, NULL));
187 tt_int_op(EV_READ, ==, event_pending(ev_lt, EV_READ, NULL));
188 tt_int_op(0, ==, event_pending(ev_et, EV_READ, NULL));
196 event_base_free(base);
199 struct testcase_t edgetriggered_testcases[] = {
200 { "et", test_edgetriggered, TT_FORK, NULL, NULL },
201 { "et_mix_error", test_edgetriggered_mix_error,
202 TT_FORK|TT_NEED_SOCKETPAIR|TT_NO_LOGS, &basic_setup, NULL },