release/src/router/libevent/test/regress_et.c

   1 /*
   2  * Copyright (c) 2009-2010 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
  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         /*printf("%s: %s %d%s\n", __func__, event & EV_ET ? "etread" : "read",
  63                 len, len ? "" : " - means EOF");
  64         */
  65
  66         called++;
  67         if (event & EV_ET)
  68                 was_et = 1;
  69
  70         if (!len)
  71                 event_del(arg);
  72 }
  73
  74 #ifndef SHUT_WR
  75 #define SHUT_WR 1
  76 #endif
  77
  78 #ifdef WIN32
  79 #define LOCAL_SOCKETPAIR_AF AF_INET
  80 #else
  81 #define LOCAL_SOCKETPAIR_AF AF_UNIX
  82 #endif
  83
  84 static void
  85 test_edgetriggered(void *et)
  86 {
  87         struct event *ev = NULL;
  88         struct event_base *base = NULL;
  89         const char *test = "test string";
  90         evutil_socket_t pair[2] = {-1,-1};
  91         int supports_et;
  92
  93         if (evutil_socketpair(LOCAL_SOCKETPAIR_AF, SOCK_STREAM, 0, pair) == -1) {
  94                 tt_abort_perror("socketpair");
  95         }
  96
  97         called = was_et = 0;
  98
  99         send(pair[0], test, (int)strlen(test)+1, 0);
 100         shutdown(pair[0], SHUT_WR);
 101
 102         /* Initalize the event library */
 103         base = event_base_new();
 104
 105         if (!strcmp(event_base_get_method(base), "epoll") ||
 106             !strcmp(event_base_get_method(base), "epoll (with changelist)") ||
 107             !strcmp(event_base_get_method(base), "kqueue"))
 108                 supports_et = 1;
 109         else
 110                 supports_et = 0;
 111
 112         TT_BLATHER(("Checking for edge-triggered events with %s, which should %s"
 113                                 "support edge-triggering", event_base_get_method(base),
 114                                 supports_et?"":"not "));
 115
 116         /* Initalize one event */
 117         ev = event_new(base, pair[1], EV_READ|EV_ET|EV_PERSIST, read_cb, &ev);
 118
 119         event_add(ev, NULL);
 120
 121         /* We're going to call the dispatch function twice.  The first invocation
 122          * will read a single byte from pair[1] in either case.  If we're edge
 123          * triggered, we'll only see the event once (since we only see transitions
 124          * from no data to data), so the second invocation of event_base_loop will
 125          * do nothing.  If we're level triggered, the second invocation of
 126          * event_base_loop will also activate the event (because there's still
 127          * data to read). */
 128         event_base_loop(base,EVLOOP_NONBLOCK|EVLOOP_ONCE);
 129         event_base_loop(base,EVLOOP_NONBLOCK|EVLOOP_ONCE);
 130
 131         if (supports_et) {
 132                 tt_int_op(called, ==, 1);
 133                 tt_assert(was_et);
 134         } else {
 135                 tt_int_op(called, ==, 2);
 136                 tt_assert(!was_et);
 137         }
 138
 139  end:
 140         if (ev) {
 141                 event_del(ev);
 142                 event_free(ev);
 143         }
 144         if (base)
 145                 event_base_free(base);
 146         evutil_closesocket(pair[0]);
 147         evutil_closesocket(pair[1]);
 148 }
 149
 150 static void
 151 test_edgetriggered_mix_error(void *data_)
 152 {
 153         struct basic_test_data *data = data_;
 154         struct event_base *base = NULL;
 155         struct event *ev_et=NULL, *ev_lt=NULL;
 156
 157 #ifdef _EVENT_DISABLE_DEBUG_MODE
 158         if (1)
 159                 tt_skip();
 160 #endif
 161
 162         event_enable_debug_mode();
 163
 164         base = event_base_new();
 165
 166         /* try mixing edge-triggered and level-triggered to make sure it fails*/
 167         ev_et = event_new(base, data->pair[0], EV_READ|EV_ET, read_cb, ev_et);
 168         ev_lt = event_new(base, data->pair[0], EV_READ, read_cb, ev_lt);
 169
 170         /* Add edge-triggered, then level-triggered.  Get an error. */
 171         tt_int_op(0, ==, event_add(ev_et, NULL));
 172         tt_int_op(-1, ==, event_add(ev_lt, NULL));
 173         tt_int_op(EV_READ, ==, event_pending(ev_et, EV_READ, NULL));
 174         tt_int_op(0, ==, event_pending(ev_lt, EV_READ, NULL));
 175
 176         tt_int_op(0, ==, event_del(ev_et));
 177         /* Add level-triggered, then edge-triggered.  Get an error. */
 178         tt_int_op(0, ==, event_add(ev_lt, NULL));
 179         tt_int_op(-1, ==, event_add(ev_et, NULL));
 180         tt_int_op(EV_READ, ==, event_pending(ev_lt, EV_READ, NULL));
 181         tt_int_op(0, ==, event_pending(ev_et, EV_READ, NULL));
 182
 183 end:
 184         if (ev_et)
 185                 event_free(ev_et);
 186         if (ev_lt)
 187                 event_free(ev_lt);
 188         if (base)
 189                 event_base_free(base);
 190 }
 191
 192 struct testcase_t edgetriggered_testcases[] = {
 193         { "et", test_edgetriggered, TT_FORK, NULL, NULL },
 194         { "et_mix_error", test_edgetriggered_mix_error,
 195           TT_FORK|TT_NEED_SOCKETPAIR|TT_NO_LOGS, &basic_setup, NULL },
 196         END_OF_TESTCASES
 197 };