ipc/chromium/src/third_party/libevent/sample/hello-world.c@deefc01c0e14
ipc/chromium/src/third_party/libevent/sample/hello-world.c
Thu, 15 Jan 2015 21:03:48 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 15 Jan 2015 21:03:48 +0100
- branch
- TOR_BUG_9701
- changeset 11
- deefc01c0e14
- permissions
- -rw-r--r--
Integrate friendly tips from Tor colleagues to make (or not) 4.5 alpha 3;
This includes removal of overloaded (but unused) methods, and addition of
a overlooked call to DataStruct::SetData(nsISupports, uint32_t, bool.)
1 /*
2 This exmple program provides a trivial server program that listens for TCP
3 connections on port 9995. When they arrive, it writes a short message to
4 each client connection, and closes each connection once it is flushed.
6 Where possible, it exits cleanly in response to a SIGINT (ctrl-c).
7 */
10 #include <string.h>
11 #include <errno.h>
12 #include <stdio.h>
13 #include <signal.h>
14 #ifndef WIN32
15 #include <netinet/in.h>
16 # ifdef _XOPEN_SOURCE_EXTENDED
17 # include <arpa/inet.h>
18 # endif
19 #include <sys/socket.h>
20 #endif
22 #include <event2/bufferevent.h>
23 #include <event2/buffer.h>
24 #include <event2/listener.h>
25 #include <event2/util.h>
26 #include <event2/event.h>
28 static const char MESSAGE[] = "Hello, World!\n";
30 static const int PORT = 9995;
32 static void listener_cb(struct evconnlistener *, evutil_socket_t,
33 struct sockaddr *, int socklen, void *);
34 static void conn_writecb(struct bufferevent *, void *);
35 static void conn_eventcb(struct bufferevent *, short, void *);
36 static void signal_cb(evutil_socket_t, short, void *);
38 int
39 main(int argc, char **argv)
40 {
41 struct event_base *base;
42 struct evconnlistener *listener;
43 struct event *signal_event;
45 struct sockaddr_in sin;
46 #ifdef WIN32
47 WSADATA wsa_data;
48 WSAStartup(0x0201, &wsa_data);
49 #endif
51 base = event_base_new();
52 if (!base) {
53 fprintf(stderr, "Could not initialize libevent!\n");
54 return 1;
55 }
57 memset(&sin, 0, sizeof(sin));
58 sin.sin_family = AF_INET;
59 sin.sin_port = htons(PORT);
61 listener = evconnlistener_new_bind(base, listener_cb, (void *)base,
62 LEV_OPT_REUSEABLE|LEV_OPT_CLOSE_ON_FREE, -1,
63 (struct sockaddr*)&sin,
64 sizeof(sin));
66 if (!listener) {
67 fprintf(stderr, "Could not create a listener!\n");
68 return 1;
69 }
71 signal_event = evsignal_new(base, SIGINT, signal_cb, (void *)base);
73 if (!signal_event || event_add(signal_event, NULL)<0) {
74 fprintf(stderr, "Could not create/add a signal event!\n");
75 return 1;
76 }
78 event_base_dispatch(base);
80 evconnlistener_free(listener);
81 event_free(signal_event);
82 event_base_free(base);
84 printf("done\n");
85 return 0;
86 }
88 static void
89 listener_cb(struct evconnlistener *listener, evutil_socket_t fd,
90 struct sockaddr *sa, int socklen, void *user_data)
91 {
92 struct event_base *base = user_data;
93 struct bufferevent *bev;
95 bev = bufferevent_socket_new(base, fd, BEV_OPT_CLOSE_ON_FREE);
96 if (!bev) {
97 fprintf(stderr, "Error constructing bufferevent!");
98 event_base_loopbreak(base);
99 return;
100 }
101 bufferevent_setcb(bev, NULL, conn_writecb, conn_eventcb, NULL);
102 bufferevent_enable(bev, EV_WRITE);
103 bufferevent_disable(bev, EV_READ);
105 bufferevent_write(bev, MESSAGE, strlen(MESSAGE));
106 }
108 static void
109 conn_writecb(struct bufferevent *bev, void *user_data)
110 {
111 struct evbuffer *output = bufferevent_get_output(bev);
112 if (evbuffer_get_length(output) == 0) {
113 printf("flushed answer\n");
114 bufferevent_free(bev);
115 }
116 }
118 static void
119 conn_eventcb(struct bufferevent *bev, short events, void *user_data)
120 {
121 if (events & BEV_EVENT_EOF) {
122 printf("Connection closed.\n");
123 } else if (events & BEV_EVENT_ERROR) {
124 printf("Got an error on the connection: %s\n",
125 strerror(errno));/*XXX win32*/
126 }
127 /* None of the other events can happen here, since we haven't enabled
128 * timeouts */
129 bufferevent_free(bev);
130 }
132 static void
133 signal_cb(evutil_socket_t sig, short events, void *user_data)
134 {
135 struct event_base *base = user_data;
136 struct timeval delay = { 2, 0 };
138 printf("Caught an interrupt signal; exiting cleanly in two seconds.\n");
140 event_base_loopexit(base, &delay);
141 }
