Update 101_helloworld_fu_wu_qi.md

101_helloworld_fu_wu_qi.md

@@ -1,2 +1,136 @@
 # 10.1 Hello_World服务器
 
+```cpp
+#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);
+}
+```