root/opal/mca/event/libevent2022/libevent/test/regress_et.c

DEFINITIONS

1. read_cb
2. test_edgetriggered
3. test_edgetriggered_mix_error

   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 #ifndef SHUT_WR
  71 #define SHUT_WR 1
  72 #endif
  73 
  74 #ifdef WIN32
  75 #define LOCAL_SOCKETPAIR_AF AF_INET
  76 #else
  77 #define LOCAL_SOCKETPAIR_AF AF_UNIX
  78 #endif
  79 
  80 static void
  81 test_edgetriggered(void *et)
  82 {
  83         struct event *ev = NULL;
  84         struct event_base *base = NULL;
  85         const char *test = "test string";
  86         evutil_socket_t pair[2] = {-1,-1};
  87         int supports_et;
  88 
  89         /* On Linux 3.2.1 (at least, as patched by Fedora and tested by Nick),
  90          * doing a "recv" on an AF_UNIX socket resets the readability of the
  91          * socket, even though there is no state change, so we don't actually
  92          * get edge-triggered behavior.  Yuck!  Linux 3.1.9 didn't have this
  93          * problem.
  94          */
  95 #ifdef __linux__
  96         if (evutil_ersatz_socketpair(AF_INET, SOCK_STREAM, 0, pair) == -1) {
  97                 tt_abort_perror("socketpair");
  98         }
  99 #else
 100         if (evutil_socketpair(LOCAL_SOCKETPAIR_AF, SOCK_STREAM, 0, pair) == -1) {
 101                 tt_abort_perror("socketpair");
 102         }
 103 #endif
 104 
 105         called = was_et = 0;
 106 
 107         tt_int_op(send(pair[0], test, (int)strlen(test)+1, 0), >, 0);
 108         shutdown(pair[0], SHUT_WR);
 109 
 110         /* Initalize the event library */
 111         base = event_base_new();
 112 
 113         if (!strcmp(event_base_get_method(base), "epoll") ||
 114             !strcmp(event_base_get_method(base), "epoll (with changelist)") ||
 115             !strcmp(event_base_get_method(base), "kqueue"))
 116                 supports_et = 1;
 117         else
 118                 supports_et = 0;
 119 
 120         TT_BLATHER(("Checking for edge-triggered events with %s, which should %s"
 121                                 "support edge-triggering", event_base_get_method(base),
 122                                 supports_et?"":"not "));
 123 
 124         /* Initalize one event */
 125         ev = event_new(base, pair[1], EV_READ|EV_ET|EV_PERSIST, read_cb, &ev);
 126 
 127         event_add(ev, NULL);
 128 
 129         /* We're going to call the dispatch function twice.  The first invocation
 130          * will read a single byte from pair[1] in either case.  If we're edge
 131          * triggered, we'll only see the event once (since we only see transitions
 132          * from no data to data), so the second invocation of event_base_loop will
 133          * do nothing.  If we're level triggered, the second invocation of
 134          * event_base_loop will also activate the event (because there's still
 135          * data to read). */
 136         event_base_loop(base,EVLOOP_NONBLOCK|EVLOOP_ONCE);
 137         event_base_loop(base,EVLOOP_NONBLOCK|EVLOOP_ONCE);
 138 
 139         if (supports_et) {
 140                 tt_int_op(called, ==, 1);
 141                 tt_assert(was_et);
 142         } else {
 143                 tt_int_op(called, ==, 2);
 144                 tt_assert(!was_et);
 145         }
 146 
 147  end:
 148         if (ev) {
 149                 event_del(ev);
 150                 event_free(ev);
 151         }
 152         if (base)
 153                 event_base_free(base);
 154         evutil_closesocket(pair[0]);
 155         evutil_closesocket(pair[1]);
 156 }
 157 
 158 static void
 159 test_edgetriggered_mix_error(void *data_)
 160 {
 161         struct basic_test_data *data = data_;
 162         struct event_base *base = NULL;
 163         struct event *ev_et=NULL, *ev_lt=NULL;
 164 
 165 #ifdef _EVENT_DISABLE_DEBUG_MODE
 166         if (1)
 167                 tt_skip();
 168 #endif
 169 
 170         event_enable_debug_mode();
 171 
 172         base = event_base_new();
 173 
 174         /* try mixing edge-triggered and level-triggered to make sure it fails*/
 175         ev_et = event_new(base, data->pair[0], EV_READ|EV_ET, read_cb, ev_et);
 176         tt_assert(ev_et);
 177         ev_lt = event_new(base, data->pair[0], EV_READ, read_cb, ev_lt);
 178         tt_assert(ev_lt);
 179 
 180         /* Add edge-triggered, then level-triggered.  Get an error. */
 181         tt_int_op(0, ==, event_add(ev_et, NULL));
 182         tt_int_op(-1, ==, event_add(ev_lt, NULL));
 183         tt_int_op(EV_READ, ==, event_pending(ev_et, EV_READ, NULL));
 184         tt_int_op(0, ==, event_pending(ev_lt, EV_READ, NULL));
 185 
 186         tt_int_op(0, ==, event_del(ev_et));
 187         /* Add level-triggered, then edge-triggered.  Get an error. */
 188         tt_int_op(0, ==, event_add(ev_lt, NULL));
 189         tt_int_op(-1, ==, event_add(ev_et, NULL));
 190         tt_int_op(EV_READ, ==, event_pending(ev_lt, EV_READ, NULL));
 191         tt_int_op(0, ==, event_pending(ev_et, EV_READ, NULL));
 192 
 193 end:
 194         if (ev_et)
 195                 event_free(ev_et);
 196         if (ev_lt)
 197                 event_free(ev_lt);
 198         if (base)
 199                 event_base_free(base);
 200 }
 201 
 202 struct testcase_t edgetriggered_testcases[] = {
 203         { "et", test_edgetriggered, TT_FORK, NULL, NULL },
 204         { "et_mix_error", test_edgetriggered_mix_error,
 205           TT_FORK|TT_NEED_SOCKETPAIR|TT_NO_LOGS, &basic_setup, NULL },
 206         END_OF_TESTCASES
 207 };