6 #include <event2/bufferevent.h>
7 #include <event2/buffer.h>
8 #include <event2/listener.h>
9 #include <event2/util.h>
10 #include <event2/event.h>
12 static const char MESSAGE[] = "Hello, World!\n";
14 static const int PORT = 9995;
16 static void listener_cb(struct evconnlistener *, evutil_socket_t,
17 struct sockaddr *, int socklen, void *);
18 static void conn_write_cb(struct bufferevent *, void *);
19 static void conn_event_cb(struct bufferevent *, short, void *);
20 static void signal_cb(evutil_socket_t, short, void *);
22 int main(int argc, char **argv) {
23 struct event_base *base;
24 struct evconnlistener *listener;
25 struct event *signal_event;
27 struct sockaddr_in sin;
29 base = event_base_new();
31 fprintf(stderr, "Could not initialize libevent!\n");
35 memset(&sin, 0, sizeof (sin));
36 sin.sin_family = AF_INET;
37 sin.sin_port = htons(PORT);
39 listener = evconnlistener_new_bind(base, listener_cb, (void *) base,
40 LEV_OPT_REUSEABLE | LEV_OPT_CLOSE_ON_FREE, -1,
41 (struct sockaddr*) &sin,
45 fprintf(stderr, "Could not create a listener!\n");
49 signal_event = evsignal_new(base, SIGINT, signal_cb, (void *) base);
51 if (!signal_event || event_add(signal_event, NULL) < 0) {
52 fprintf(stderr, "Could not create/add a signal event!\n");
56 event_base_dispatch(base);
58 evconnlistener_free(listener);
59 event_free(signal_event);
60 event_base_free(base);
66 static void listener_cb(struct evconnlistener *listener, evutil_socket_t fd, struct sockaddr *sa, int socklen, void *user_data) {
67 struct event_base *base = (event_base *) user_data;
68 struct bufferevent *bev;
70 bev = bufferevent_socket_new(base, fd, BEV_OPT_CLOSE_ON_FREE); // zavírá spojení
71 //bev = bufferevent_socket_new(base, fd, 0); // nezavírá spojení
73 fprintf(stderr, "Error constructing bufferevent!");
74 event_base_loopbreak(base);
77 bufferevent_setcb(bev, NULL, conn_write_cb, conn_event_cb, NULL);
78 bufferevent_enable(bev, EV_WRITE);
79 bufferevent_disable(bev, EV_READ);
81 printf("někdo se k nám připojil! / %p\n", bev);
83 bufferevent_write(bev, MESSAGE, strlen(MESSAGE));
86 static void conn_write_cb(struct bufferevent *bev, void *user_data) {
87 struct evbuffer *output = bufferevent_get_output(bev);
88 if (evbuffer_get_length(output) == 0) {
89 printf("flushed answer / %p\n", bev);
90 bufferevent_free(bev);
94 static void conn_event_cb(struct bufferevent *bev, short events, void *user_data) {
95 if (events & BEV_EVENT_EOF) {
96 printf("Connection closed.\n");
97 } else if (events & BEV_EVENT_ERROR) {
98 printf("Got an error on the connection: %s\n",
99 strerror(errno)); /*XXX win32*/
102 // None of the other events can happen here, since we haven't enabled timeouts
103 bufferevent_free(bev);
106 static void signal_cb(evutil_socket_t sig, short events, void *user_data) {
107 struct event_base *base = (event_base *) user_data;
108 struct timeval delay = {2, 123};
110 printf("Zachycen SIGINT (Ctrl+C); ukončuji program během %ld sekund a %ld mikrosekund.\n", delay.tv_sec, delay.tv_usec);
112 event_base_loopexit(base, &delay);