1 /* 2 * Copyright (c) 2009-2012 Niels Provos and Nick Mathewson 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 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. 14 * 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. 25 */ 26 #include "../util-internal.h" 27 #include "event2/event-config.h" 28 29 #ifdef _WIN32 30 #include <winsock2.h> 31 #endif 32 #include <sys/types.h> 33 #include <sys/stat.h> 34 #ifdef EVENT__HAVE_SYS_SOCKET_H 35 #include <sys/socket.h> 36 #endif 37 #include <fcntl.h> 38 #include <stdlib.h> 39 #include <stdio.h> 40 #include <string.h> 41 #ifndef _WIN32 42 #include <sys/time.h> 43 #include <unistd.h> 44 #endif 45 #include <errno.h> 46 47 #include "event2/event.h" 48 #include "event2/util.h" 49 50 #include "regress.h" 51 52 static int was_et = 0; 53 54 static void 55 read_cb(evutil_socket_t fd, short event, void *arg) 56 { 57 char buf; 58 int len; 59 60 len = recv(fd, &buf, sizeof(buf), 0); 61 62 called++; 63 if (event & EV_ET) 64 was_et = 1; 65 66 if (!len) 67 event_del(arg); 68 } 69 70 #ifdef _WIN32 71 #define LOCAL_SOCKETPAIR_AF AF_INET 72 #else 73 #define LOCAL_SOCKETPAIR_AF AF_UNIX 74 #endif 75 76 static void 77 test_edgetriggered(void *et) 78 { 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}; 83 int supports_et; 84 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 89 * problem. 90 */ 91 #ifdef __linux__ 92 if (evutil_ersatz_socketpair_(AF_INET, SOCK_STREAM, 0, pair) == -1) { 93 tt_abort_perror("socketpair"); 94 } 95 #else 96 if (evutil_socketpair(LOCAL_SOCKETPAIR_AF, SOCK_STREAM, 0, pair) == -1) { 97 tt_abort_perror("socketpair"); 98 } 99 #endif 100 101 called = was_et = 0; 102 103 tt_int_op(send(pair[0], test, (int)strlen(test)+1, 0), >, 0); 104 shutdown(pair[0], EVUTIL_SHUT_WR); 105 106 /* Initalize the event library */ 107 base = event_base_new(); 108 109 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")) 112 supports_et = 1; 113 else 114 supports_et = 0; 115 116 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 ")); 119 120 /* Initalize one event */ 121 ev = event_new(base, pair[1], EV_READ|EV_ET|EV_PERSIST, read_cb, &ev); 122 123 event_add(ev, NULL); 124 125 /* 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 131 * data to read). */ 132 event_base_loop(base,EVLOOP_NONBLOCK|EVLOOP_ONCE); 133 event_base_loop(base,EVLOOP_NONBLOCK|EVLOOP_ONCE); 134 135 if (supports_et) { 136 tt_int_op(called, ==, 1); 137 tt_assert(was_et); 138 } else { 139 tt_int_op(called, ==, 2); 140 tt_assert(!was_et); 141 } 142 143 end: 144 if (ev) { 145 event_del(ev); 146 event_free(ev); 147 } 148 if (base) 149 event_base_free(base); 150 evutil_closesocket(pair[0]); 151 evutil_closesocket(pair[1]); 152 } 153 154 static void 155 test_edgetriggered_mix_error(void *data_) 156 { 157 struct basic_test_data *data = data_; 158 struct event_base *base = NULL; 159 struct event *ev_et=NULL, *ev_lt=NULL; 160 161 #ifdef EVENT__DISABLE_DEBUG_MODE 162 if (1) 163 tt_skip(); 164 #endif 165 166 if (!libevent_tests_running_in_debug_mode) 167 event_enable_debug_mode(); 168 169 base = event_base_new(); 170 171 /* 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); 173 tt_assert(ev_et); 174 ev_lt = event_new(base, data->pair[0], EV_READ, read_cb, ev_lt); 175 tt_assert(ev_lt); 176 177 /* 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)); 182 183 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)); 189 190 end: 191 if (ev_et) 192 event_free(ev_et); 193 if (ev_lt) 194 event_free(ev_lt); 195 if (base) 196 event_base_free(base); 197 } 198 199 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 }, 203 END_OF_TESTCASES 204 }; 205
