1 /* $NetBSD: regress_et.c,v 1.5 2020/05/25 20:47:34 christos Exp $ */ 2 3 /* 4 * Copyright (c) 2009-2012 Niels Provos and Nick Mathewson 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 #include "../util-internal.h" 29 #include "event2/event-config.h" 30 31 #ifdef _WIN32 32 #include <winsock2.h> 33 #endif 34 #include <sys/types.h> 35 #include <sys/stat.h> 36 #ifdef EVENT__HAVE_SYS_SOCKET_H 37 #include <sys/socket.h> 38 #endif 39 #include <fcntl.h> 40 #include <stdlib.h> 41 #include <stdio.h> 42 #include <string.h> 43 #ifndef _WIN32 44 #include <sys/time.h> 45 #include <unistd.h> 46 #endif 47 #include <errno.h> 48 49 #include "event2/event.h" 50 #include "event2/util.h" 51 52 #include "regress.h" 53 54 static int was_et = 0; 55 56 static void 57 read_cb(evutil_socket_t fd, short event, void *arg) 58 { 59 char buf; 60 int len; 61 62 len = recv(fd, &buf, sizeof(buf), 0); 63 64 called++; 65 if (event & EV_ET) 66 was_et = 1; 67 68 if (!len) 69 event_del(arg); 70 } 71 72 #ifndef SHUT_WR 73 #define SHUT_WR 1 74 #endif 75 76 #ifdef _WIN32 77 #define LOCAL_SOCKETPAIR_AF AF_INET 78 #else 79 #define LOCAL_SOCKETPAIR_AF AF_UNIX 80 #endif 81 82 static void 83 test_edgetriggered(void *et) 84 { 85 struct event *ev = NULL; 86 struct event_base *base = NULL; 87 const char *test = "test string"; 88 evutil_socket_t pair[2] = {-1,-1}; 89 int supports_et; 90 91 /* On Linux 3.2.1 (at least, as patched by Fedora and tested by Nick), 92 * doing a "recv" on an AF_UNIX socket resets the readability of the 93 * socket, even though there is no state change, so we don't actually 94 * get edge-triggered behavior. Yuck! Linux 3.1.9 didn't have this 95 * problem. 96 */ 97 #ifdef __linux__ 98 if (evutil_ersatz_socketpair_(AF_INET, SOCK_STREAM, 0, pair) == -1) { 99 tt_abort_perror("socketpair"); 100 } 101 #else 102 if (evutil_socketpair(LOCAL_SOCKETPAIR_AF, SOCK_STREAM, 0, pair) == -1) { 103 tt_abort_perror("socketpair"); 104 } 105 #endif 106 107 called = was_et = 0; 108 109 tt_int_op(send(pair[0], test, (int)strlen(test)+1, 0), >, 0); 110 shutdown(pair[0], SHUT_WR); 111 112 /* Initalize the event library */ 113 base = event_base_new(); 114 115 if (!strcmp(event_base_get_method(base), "epoll") || 116 !strcmp(event_base_get_method(base), "epoll (with changelist)") || 117 !strcmp(event_base_get_method(base), "kqueue")) 118 supports_et = 1; 119 else 120 supports_et = 0; 121 122 TT_BLATHER(("Checking for edge-triggered events with %s, which should %s" 123 "support edge-triggering", event_base_get_method(base), 124 supports_et?"":"not ")); 125 126 /* Initalize one event */ 127 ev = event_new(base, pair[1], EV_READ|EV_ET|EV_PERSIST, read_cb, &ev); 128 129 event_add(ev, NULL); 130 131 /* We're going to call the dispatch function twice. The first invocation 132 * will read a single byte from pair[1] in either case. If we're edge 133 * triggered, we'll only see the event once (since we only see transitions 134 * from no data to data), so the second invocation of event_base_loop will 135 * do nothing. If we're level triggered, the second invocation of 136 * event_base_loop will also activate the event (because there's still 137 * data to read). */ 138 event_base_loop(base,EVLOOP_NONBLOCK|EVLOOP_ONCE); 139 event_base_loop(base,EVLOOP_NONBLOCK|EVLOOP_ONCE); 140 141 if (supports_et) { 142 tt_int_op(called, ==, 1); 143 tt_assert(was_et); 144 } else { 145 tt_int_op(called, ==, 2); 146 tt_assert(!was_et); 147 } 148 149 end: 150 if (ev) { 151 event_del(ev); 152 event_free(ev); 153 } 154 if (base) 155 event_base_free(base); 156 evutil_closesocket(pair[0]); 157 evutil_closesocket(pair[1]); 158 } 159 160 static void 161 test_edgetriggered_mix_error(void *data_) 162 { 163 struct basic_test_data *data = data_; 164 struct event_base *base = NULL; 165 struct event *ev_et=NULL, *ev_lt=NULL; 166 167 #ifdef EVENT__DISABLE_DEBUG_MODE 168 if (1) 169 tt_skip(); 170 #endif 171 172 if (!libevent_tests_running_in_debug_mode) 173 event_enable_debug_mode(); 174 175 base = event_base_new(); 176 177 /* try mixing edge-triggered and level-triggered to make sure it fails*/ 178 ev_et = event_new(base, data->pair[0], EV_READ|EV_ET, read_cb, ev_et); 179 tt_assert(ev_et); 180 ev_lt = event_new(base, data->pair[0], EV_READ, read_cb, ev_lt); 181 tt_assert(ev_lt); 182 183 /* Add edge-triggered, then level-triggered. Get an error. */ 184 tt_int_op(0, ==, event_add(ev_et, NULL)); 185 tt_int_op(-1, ==, event_add(ev_lt, NULL)); 186 tt_int_op(EV_READ, ==, event_pending(ev_et, EV_READ, NULL)); 187 tt_int_op(0, ==, event_pending(ev_lt, EV_READ, NULL)); 188 189 tt_int_op(0, ==, event_del(ev_et)); 190 /* Add level-triggered, then edge-triggered. Get an error. */ 191 tt_int_op(0, ==, event_add(ev_lt, NULL)); 192 tt_int_op(-1, ==, event_add(ev_et, NULL)); 193 tt_int_op(EV_READ, ==, event_pending(ev_lt, EV_READ, NULL)); 194 tt_int_op(0, ==, event_pending(ev_et, EV_READ, NULL)); 195 196 end: 197 if (ev_et) 198 event_free(ev_et); 199 if (ev_lt) 200 event_free(ev_lt); 201 if (base) 202 event_base_free(base); 203 } 204 205 struct testcase_t edgetriggered_testcases[] = { 206 { "et", test_edgetriggered, TT_FORK, NULL, NULL }, 207 { "et_mix_error", test_edgetriggered_mix_error, 208 TT_FORK|TT_NEED_SOCKETPAIR|TT_NO_LOGS, &basic_setup, NULL }, 209 END_OF_TESTCASES 210 }; 211