external/bsd/libevent/dist/test/regress_et.c

   1 /*      $NetBSD: regress_et.c,v 1.2 2013/04/11 16:56:42 christos Exp $  */
   2 /*
   3  * Copyright (c) 2009-2012 Niels Provos and Nick Mathewson
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. The name of the author may not be used to endorse or promote products
  14  *    derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27 #include "../util-internal.h"
  28 #include "event2/event-config.h"
  29 #include <sys/cdefs.h>
  30 __RCSID("$NetBSD: regress_et.c,v 1.2 2013/04/11 16:56:42 christos Exp $");
  31
  32 #ifdef WIN32
  33 #include <winsock2.h>
  34 #endif
  35 #include <sys/types.h>
  36 #include <sys/stat.h>
  37 #ifdef _EVENT_HAVE_SYS_SOCKET_H
  38 #include <sys/socket.h>
  39 #endif
  40 #include <fcntl.h>
  41 #include <stdlib.h>
  42 #include <stdio.h>
  43 #include <string.h>
  44 #ifndef WIN32
  45 #include <sys/time.h>
  46 #include <unistd.h>
  47 #endif
  48 #include <errno.h>
  49
  50 #include "event2/event.h"
  51 #include "event2/util.h"
  52
  53 #include "regress.h"
  54
  55 static int was_et = 0;
  56
  57 static void
  58 read_cb(evutil_socket_t fd, short event, void *arg)
  59 {
  60         char buf;
  61         int len;
  62
  63         len = recv(fd, &buf, sizeof(buf), 0);
  64
  65         called++;
  66         if (event & EV_ET)
  67                 was_et = 1;
  68
  69         if (!len)
  70                 event_del(arg);
  71 }
  72
  73 #ifndef SHUT_WR
  74 #define SHUT_WR 1
  75 #endif
  76
  77 #ifdef WIN32
  78 #define LOCAL_SOCKETPAIR_AF AF_INET
  79 #else
  80 #define LOCAL_SOCKETPAIR_AF AF_UNIX
  81 #endif
  82
  83 static void
  84 test_edgetriggered(void *et)
  85 {
  86         struct event *ev = NULL;
  87         struct event_base *base = NULL;
  88         const char *test = "test string";
  89         evutil_socket_t xpair[2] = {-1,-1};
  90         int supports_et;
  91
  92         /* On Linux 3.2.1 (at least, as patched by Fedora and tested by Nick),
  93          * doing a "recv" on an AF_UNIX socket resets the readability of the
  94          * socket, even though there is no state change, so we don't actually
  95          * get edge-triggered behavior.  Yuck!  Linux 3.1.9 didn't have this
  96          * problem.
  97          */
  98 #ifdef __linux__
  99         if (evutil_ersatz_socketpair(AF_INET, SOCK_STREAM, 0, xpair) == -1) {
 100                 tt_abort_perror("socketpair");
 101         }
 102 #else
 103         if (evutil_socketpair(LOCAL_SOCKETPAIR_AF, SOCK_STREAM, 0, xpair) == -1) {
 104                 tt_abort_perror("socketpair");
 105         }
 106 #endif
 107
 108         called = was_et = 0;
 109
 110         tt_int_op(send(xpair[0], test, (int)strlen(test)+1, 0), >, 0);
 111         shutdown(xpair[0], SHUT_WR);
 112
 113         /* Initalize the event library */
 114         base = event_base_new();
 115
 116         if (!strcmp(event_base_get_method(base), "epoll") ||
 117             !strcmp(event_base_get_method(base), "epoll (with changelist)") ||
 118             !strcmp(event_base_get_method(base), "kqueue"))
 119                 supports_et = 1;
 120         else
 121                 supports_et = 0;
 122
 123         TT_BLATHER(("Checking for edge-triggered events with %s, which should %s"
 124                                 "support edge-triggering", event_base_get_method(base),
 125                                 supports_et?"":"not "));
 126
 127         /* Initalize one event */
 128         ev = event_new(base, xpair[1], EV_READ|EV_ET|EV_PERSIST, read_cb, &ev);
 129
 130         event_add(ev, NULL);
 131
 132         /* We're going to call the dispatch function twice.  The first invocation
 133          * will read a single byte from xpair[1] in either case.  If we're edge
 134          * triggered, we'll only see the event once (since we only see transitions
 135          * from no data to data), so the second invocation of event_base_loop will
 136          * do nothing.  If we're level triggered, the second invocation of
 137          * event_base_loop will also activate the event (because there's still
 138          * data to read). */
 139         event_base_loop(base,EVLOOP_NONBLOCK|EVLOOP_ONCE);
 140         event_base_loop(base,EVLOOP_NONBLOCK|EVLOOP_ONCE);
 141
 142         if (supports_et) {
 143                 tt_int_op(called, ==, 1);
 144                 tt_assert(was_et);
 145         } else {
 146                 tt_int_op(called, ==, 2);
 147                 tt_assert(!was_et);
 148         }
 149
 150  end:
 151         if (ev) {
 152                 event_del(ev);
 153                 event_free(ev);
 154         }
 155         if (base)
 156                 event_base_free(base);
 157         evutil_closesocket(xpair[0]);
 158         evutil_closesocket(xpair[1]);
 159 }
 160
 161 static void
 162 test_edgetriggered_mix_error(void *data_)
 163 {
 164         struct basic_test_data *data = data_;
 165         struct event_base *base = NULL;
 166         struct event *ev_et=NULL, *ev_lt=NULL;
 167
 168 #ifdef _EVENT_DISABLE_DEBUG_MODE
 169         if (1)
 170                 tt_skip();
 171 #endif
 172
 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 };