Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 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 | }; |