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[netatalk.git] / libevent / sample / hello-world.c

diff --git a/libevent/sample/hello-world.c b/libevent/sample/hello-world.c
new file mode 100644 (file)
index 0000000..d40af52
--- /dev/null
+++ b/libevent/sample/hello-world.c
@@ -0,0 +1,141 @@
+/*
+  This exmple program provides a trivial server program that listens for TCP
+  connections on port 9995.  When they arrive, it writes a short message to
+  each client connection, and closes each connection once it is flushed.
+
+  Where possible, it exits cleanly in response to a SIGINT (ctrl-c).
+*/
+
+
+#include <string.h>
+#include <errno.h>
+#include <stdio.h>
+#include <signal.h>
+#ifndef WIN32
+#include <netinet/in.h>
+# ifdef _XOPEN_SOURCE_EXTENDED
+#  include <arpa/inet.h>
+# endif
+#include <sys/socket.h>
+#endif
+
+#include <event2/bufferevent.h>
+#include <event2/buffer.h>
+#include <event2/listener.h>
+#include <event2/util.h>
+#include <event2/event.h>
+
+static const char MESSAGE[] = "Hello, World!\n";
+
+static const int PORT = 9995;
+
+static void listener_cb(struct evconnlistener *, evutil_socket_t,
+    struct sockaddr *, int socklen, void *);
+static void conn_writecb(struct bufferevent *, void *);
+static void conn_eventcb(struct bufferevent *, short, void *);
+static void signal_cb(evutil_socket_t, short, void *);
+
+int
+main(int argc, char **argv)
+{
+       struct event_base *base;
+       struct evconnlistener *listener;
+       struct event *signal_event;
+
+       struct sockaddr_in sin;
+#ifdef WIN32
+       WSADATA wsa_data;
+       WSAStartup(0x0201, &wsa_data);
+#endif
+
+       base = event_base_new();
+       if (!base) {
+               fprintf(stderr, "Could not initialize libevent!\n");
+               return 1;
+       }
+
+       memset(&sin, 0, sizeof(sin));
+       sin.sin_family = AF_INET;
+       sin.sin_port = htons(PORT);
+
+       listener = evconnlistener_new_bind(base, listener_cb, (void *)base,
+           LEV_OPT_REUSEABLE|LEV_OPT_CLOSE_ON_FREE, -1,
+           (struct sockaddr*)&sin,
+           sizeof(sin));
+
+       if (!listener) {
+               fprintf(stderr, "Could not create a listener!\n");
+               return 1;
+       }
+
+       signal_event = evsignal_new(base, SIGINT, signal_cb, (void *)base);
+
+       if (!signal_event || event_add(signal_event, NULL)<0) {
+               fprintf(stderr, "Could not create/add a signal event!\n");
+               return 1;
+       }
+
+       event_base_dispatch(base);
+
+       evconnlistener_free(listener);
+       event_free(signal_event);
+       event_base_free(base);
+
+       printf("done\n");
+       return 0;
+}
+
+static void
+listener_cb(struct evconnlistener *listener, evutil_socket_t fd,
+    struct sockaddr *sa, int socklen, void *user_data)
+{
+       struct event_base *base = user_data;
+       struct bufferevent *bev;
+
+       bev = bufferevent_socket_new(base, fd, BEV_OPT_CLOSE_ON_FREE);
+       if (!bev) {
+               fprintf(stderr, "Error constructing bufferevent!");
+               event_base_loopbreak(base);
+               return;
+       }
+       bufferevent_setcb(bev, NULL, conn_writecb, conn_eventcb, NULL);
+       bufferevent_enable(bev, EV_WRITE);
+       bufferevent_disable(bev, EV_READ);
+
+       bufferevent_write(bev, MESSAGE, strlen(MESSAGE));
+}
+
+static void
+conn_writecb(struct bufferevent *bev, void *user_data)
+{
+       struct evbuffer *output = bufferevent_get_output(bev);
+       if (evbuffer_get_length(output) == 0) {
+               printf("flushed answer\n");
+               bufferevent_free(bev);
+       }
+}
+
+static void
+conn_eventcb(struct bufferevent *bev, short events, void *user_data)
+{
+       if (events & BEV_EVENT_EOF) {
+               printf("Connection closed.\n");
+       } else if (events & BEV_EVENT_ERROR) {
+               printf("Got an error on the connection: %s\n",
+                   strerror(errno));/*XXX win32*/
+       }
+       /* None of the other events can happen here, since we haven't enabled
+        * timeouts */
+       bufferevent_free(bev);
+}
+
+static void
+signal_cb(evutil_socket_t sig, short events, void *user_data)
+{
+       struct event_base *base = user_data;
+       struct timeval delay = { 2, 0 };
+
+       printf("Caught an interrupt signal; exiting cleanly in two seconds.\n");
+
+       event_base_loopexit(base, &delay);
+}