mirror of
https://github.com/libevent/libevent.git
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129 lines
2.7 KiB
C
129 lines
2.7 KiB
C
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#include <event-config.h>
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#ifdef WIN32
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#include <winsock2.h>
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#endif
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#ifdef _EVENT_HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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#include <fcntl.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include <event2/event.h>
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#include <event2/util.h>
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#include "regress.h"
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static int was_et = 0;
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static void
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read_cb(int fd, short event, void *arg)
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{
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char buf;
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int len;
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len = read(fd, &buf, sizeof(buf));
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/*printf("%s: %s %d%s\n", __func__, event & EV_ET ? "etread" : "read",
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len, len ? "" : " - means EOF");
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*/
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called++;
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if (event & EV_ET)
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was_et = 1;
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if (!len)
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event_del(arg);
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}
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#ifndef SHUT_WR
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#define SHUT_WR 1
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#endif
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#ifdef WIN32
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#define LOCAL_SOCKETPAIR_AF AF_INET
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#else
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#define LOCAL_SOCKETPAIR_AF AF_UNIX
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#endif
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static void
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test_edgetriggered(void *et)
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{
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struct event *ev = NULL;
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struct event_base *base = NULL;
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const char *test = "test string";
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evutil_socket_t pair[2] = {-1,-1};
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int supports_et;
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int success;
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if (evutil_socketpair(LOCAL_SOCKETPAIR_AF, SOCK_STREAM, 0, pair) == -1) {
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tt_fail_perror("socketpair");
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}
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called = was_et = 0;
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write(pair[0], test, strlen(test)+1);
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shutdown(pair[0], SHUT_WR);
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/* Initalize the event library */
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base = event_base_new();
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if (!strcmp(event_base_get_method(base), "epoll") ||
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!strcmp(event_base_get_method(base), "kqueue"))
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supports_et = 1;
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else
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supports_et = 0;
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TT_BLATHER(("Checking for edge-triggered events with %s, which should %s"
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"support edge-triggering", event_base_get_method(base),
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supports_et?"":"not "));
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/* Initalize one event */
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ev = event_new(base, pair[1], EV_READ|EV_ET|EV_PERSIST, read_cb, &ev);
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event_add(ev, NULL);
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/* We're going to call the dispatch function twice. The first invocation
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* will read a single byte from pair[1] in either case. If we're edge
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* triggered, we'll only see the event once (since we only see transitions
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* from no data to data), so the second invocation of event_base_loop will
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* do nothing. If we're level triggered, the second invocation of
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* event_base_loop will also activate the event (because there's still
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* data to read). */
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event_base_loop(base,EVLOOP_NONBLOCK|EVLOOP_ONCE);
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event_base_loop(base,EVLOOP_NONBLOCK|EVLOOP_ONCE);
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if (supports_et) {
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tt_int_op(called, ==, 1);
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tt_assert(was_et);
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} else {
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tt_int_op(called, ==, 2);
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tt_assert(!was_et);
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success = (called == 2) && !was_et;
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}
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end:
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if (ev) {
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event_del(ev);
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event_free(ev);
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}
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if (base)
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event_base_free(base);
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EVUTIL_CLOSESOCKET(pair[0]);
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EVUTIL_CLOSESOCKET(pair[1]);
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}
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struct testcase_t edgetriggered_testcases[] = {
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{ "et", test_edgetriggered, TT_FORK, NULL, NULL },
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END_OF_TESTCASES
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};
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