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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-15 18:02:34 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-15 18:02:34 +0000
commitfadeddfbb2aa38a980dd959b5ec1ffba7afd43cb (patch)
treea7bde6111c84ea64619656a38fba50909fa0bf60 /libevent/test/regress_et.c
parentInitial commit. (diff)
downloadlldpd-fadeddfbb2aa38a980dd959b5ec1ffba7afd43cb.tar.xz
lldpd-fadeddfbb2aa38a980dd959b5ec1ffba7afd43cb.zip
Adding upstream version 1.0.18.upstream/1.0.18upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'libevent/test/regress_et.c')
-rw-r--r--libevent/test/regress_et.c270
1 files changed, 270 insertions, 0 deletions
diff --git a/libevent/test/regress_et.c b/libevent/test/regress_et.c
new file mode 100644
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+++ b/libevent/test/regress_et.c
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+/*
+ * Copyright (c) 2009-2012 Niels Provos and Nick Mathewson
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#include "../util-internal.h"
+#include "event2/event-config.h"
+
+#ifdef _WIN32
+#include <winsock2.h>
+#endif
+#include <sys/types.h>
+#include <sys/stat.h>
+#ifdef EVENT__HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+#include <fcntl.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#ifndef _WIN32
+#include <sys/time.h>
+#include <unistd.h>
+#endif
+#include <errno.h>
+
+#include "event2/event.h"
+#include "event2/util.h"
+
+#include "regress.h"
+
+static int was_et = 0;
+
+static int base_supports_et(struct event_base *base)
+{
+ return
+ (!strcmp(event_base_get_method(base), "epoll") ||
+ !strcmp(event_base_get_method(base), "epoll (with changelist)") ||
+ !strcmp(event_base_get_method(base), "kqueue"));
+}
+
+static void
+read_cb(evutil_socket_t fd, short event, void *arg)
+{
+ char buf;
+ int len;
+
+ len = recv(fd, &buf, sizeof(buf), 0);
+
+ called++;
+ if (event & EV_ET)
+ was_et = 1;
+
+ if (!len)
+ event_del(arg);
+}
+
+static void
+test_edgetriggered(void *data_)
+{
+ struct basic_test_data *data = data_;
+ struct event_base *base = data->base;
+ evutil_socket_t *pair = data->pair;
+ struct event *ev = NULL;
+ const char *test = "test string";
+ int supports_et;
+
+ /* On Linux 3.2.1 (at least, as patched by Fedora and tested by Nick),
+ * doing a "recv" on an AF_UNIX socket resets the readability of the
+ * socket, even though there is no state change, so we don't actually
+ * get edge-triggered behavior. Yuck! Linux 3.1.9 didn't have this
+ * problem.
+ */
+
+ called = was_et = 0;
+
+ tt_int_op(send(pair[0], test, (int)strlen(test)+1, 0), >, 0);
+ tt_int_op(shutdown(pair[0], EVUTIL_SHUT_WR), ==, 0);
+
+ supports_et = base_supports_et(base);
+ TT_BLATHER(("Checking for edge-triggered events with %s, which should %s"
+ "support edge-triggering", event_base_get_method(base),
+ supports_et?"":"not "));
+
+ /* Initialize one event */
+ ev = event_new(base, pair[1], EV_READ|EV_ET|EV_PERSIST, read_cb, &ev);
+ tt_assert(ev != NULL);
+ tt_int_op(event_add(ev, NULL), ==, 0);
+
+ /* We're going to call the dispatch function twice. The first invocation
+ * will read a single byte from pair[1] in either case. If we're edge
+ * triggered, we'll only see the event once (since we only see transitions
+ * from no data to data), so the second invocation of event_base_loop will
+ * do nothing. If we're level triggered, the second invocation of
+ * event_base_loop will also activate the event (because there's still
+ * data to read). */
+ tt_int_op(event_base_loop(base,EVLOOP_NONBLOCK|EVLOOP_ONCE), ==, 0);
+ tt_int_op(event_base_loop(base,EVLOOP_NONBLOCK|EVLOOP_ONCE), ==, 0);
+
+ if (supports_et) {
+ tt_int_op(called, ==, 1);
+ tt_assert(was_et);
+ } else {
+ tt_int_op(called, ==, 2);
+ tt_assert(!was_et);
+ }
+
+end:
+ if (ev) {
+ event_del(ev);
+ event_free(ev);
+ }
+}
+
+static void
+test_edgetriggered_mix_error(void *data_)
+{
+ struct basic_test_data *data = data_;
+ struct event_base *base = NULL;
+ struct event *ev_et=NULL, *ev_lt=NULL;
+
+#ifdef EVENT__DISABLE_DEBUG_MODE
+ if (1)
+ tt_skip();
+#endif
+
+ if (!libevent_tests_running_in_debug_mode)
+ event_enable_debug_mode();
+
+ base = event_base_new();
+
+ /* try mixing edge-triggered and level-triggered to make sure it fails*/
+ ev_et = event_new(base, data->pair[0], EV_READ|EV_ET, read_cb, ev_et);
+ tt_assert(ev_et);
+ ev_lt = event_new(base, data->pair[0], EV_READ, read_cb, ev_lt);
+ tt_assert(ev_lt);
+
+ /* Add edge-triggered, then level-triggered. Get an error. */
+ tt_int_op(0, ==, event_add(ev_et, NULL));
+ tt_int_op(-1, ==, event_add(ev_lt, NULL));
+ tt_int_op(EV_READ, ==, event_pending(ev_et, EV_READ, NULL));
+ tt_int_op(0, ==, event_pending(ev_lt, EV_READ, NULL));
+
+ tt_int_op(0, ==, event_del(ev_et));
+ /* Add level-triggered, then edge-triggered. Get an error. */
+ tt_int_op(0, ==, event_add(ev_lt, NULL));
+ tt_int_op(-1, ==, event_add(ev_et, NULL));
+ tt_int_op(EV_READ, ==, event_pending(ev_lt, EV_READ, NULL));
+ tt_int_op(0, ==, event_pending(ev_et, EV_READ, NULL));
+
+end:
+ if (ev_et)
+ event_free(ev_et);
+ if (ev_lt)
+ event_free(ev_lt);
+ if (base)
+ event_base_free(base);
+}
+
+static int read_notification_count;
+static int last_read_notification_was_et;
+static void
+read_notification_cb(evutil_socket_t fd, short event, void *arg)
+{
+ read_notification_count++;
+ last_read_notification_was_et = (event & EV_ET);
+}
+
+static int write_notification_count;
+static int last_write_notification_was_et;
+static void
+write_notification_cb(evutil_socket_t fd, short event, void *arg)
+{
+ write_notification_count++;
+ last_write_notification_was_et = (event & EV_ET);
+}
+
+/* After two or more events have been registered for the same
+ * file descriptor using EV_ET, if one of the events is
+ * deleted, then the epoll_ctl() call issued by libevent drops
+ * the EPOLLET flag resulting in level triggered
+ * notifications.
+ */
+static void
+test_edge_triggered_multiple_events(void *data_)
+{
+ struct basic_test_data *data = data_;
+ struct event *read_ev = NULL;
+ struct event *write_ev = NULL;
+ const char c = 'A';
+ struct event_base *base = data->base;
+ evutil_socket_t *pair = data->pair;
+
+ if (!base_supports_et(base)) {
+ tt_skip();
+ return;
+ }
+
+ read_notification_count = 0;
+ last_read_notification_was_et = 0;
+ write_notification_count = 0;
+ last_write_notification_was_et = 0;
+
+ /* Make pair[1] readable */
+ tt_int_op(send(pair[0], &c, 1, 0), >, 0);
+
+ read_ev = event_new(base, pair[1], EV_READ|EV_ET|EV_PERSIST,
+ read_notification_cb, NULL);
+ write_ev = event_new(base, pair[1], EV_WRITE|EV_ET|EV_PERSIST,
+ write_notification_cb, NULL);
+
+ event_add(read_ev, NULL);
+ event_add(write_ev, NULL);
+ event_base_loop(base, EVLOOP_NONBLOCK|EVLOOP_ONCE);
+ event_base_loop(base, EVLOOP_NONBLOCK|EVLOOP_ONCE);
+
+ tt_assert(last_read_notification_was_et);
+ tt_int_op(read_notification_count, ==, 1);
+ tt_assert(last_write_notification_was_et);
+ tt_int_op(write_notification_count, ==, 1);
+
+ event_del(read_ev);
+
+ /* trigger acitivity second time for the backend that can have multiple
+ * events for one fd (like kqueue) */
+ close(pair[0]);
+ pair[0] = -1;
+
+ /* Verify that we are still edge-triggered for write notifications */
+ event_base_loop(base, EVLOOP_NONBLOCK|EVLOOP_ONCE);
+ event_base_loop(base, EVLOOP_NONBLOCK|EVLOOP_ONCE);
+ tt_assert(last_write_notification_was_et);
+ tt_int_op(write_notification_count, ==, 2);
+
+end:
+ if (read_ev)
+ event_free(read_ev);
+ if (write_ev)
+ event_free(write_ev);
+}
+
+struct testcase_t edgetriggered_testcases[] = {
+ { "et", test_edgetriggered,
+ TT_FORK|TT_NEED_BASE|TT_NEED_SOCKETPAIR, &basic_setup, NULL },
+ { "et_mix_error", test_edgetriggered_mix_error,
+ TT_FORK|TT_NEED_SOCKETPAIR|TT_NO_LOGS, &basic_setup, NULL },
+ { "et_multiple_events", test_edge_triggered_multiple_events,
+ TT_FORK|TT_NEED_BASE|TT_NEED_SOCKETPAIR, &basic_setup, NULL },
+ END_OF_TESTCASES
+};