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kc3-lang/libevent/test/regress_et.c
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- 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); tt_assert(read_ev); tt_assert(write_ev); 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 };