diff options
Diffstat (limited to 'libevent/test/regress_et.c')
| -rw-r--r-- | libevent/test/regress_et.c | 270 |
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 index 0000000..1b1f819 --- /dev/null +++ b/libevent/test/regress_et.c @@ -0,0 +1,270 @@ +/* + * 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 +}; |