move TCP client/server and UDP client/server example to this directory.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@457 bbd45198-f89e-11dd-88c7-29a3b14d5316

examples/network/tcpclient.c

@@ -0,0 +1,81 @@
+#include <rtthread.h>
+#include <lwip/netdb.h>
+#include <lwip/sockets.h>
+
+static const char send_data[] = "This is TCP Client from RT-Thread.";
+void tcpclient(const char* url, int port)
+{
+	char *recv_data;
+	struct hostent *host;
+	int sock, bytes_received;
+	struct sockaddr_in server_addr;
+
+	host = gethostbyname(url);
+
+    recv_data = rt_malloc(1024);
+    if (recv_data == RT_NULL)
+    {
+        rt_kprintf("No memory\n");
+        return;
+    }
+
+	if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1)
+	{
+		rt_kprintf("Socket error\n");
+
+        /* release recv buffer */
+        rt_free(recv_data);
+		return;
+	}
+
+	server_addr.sin_family = AF_INET;
+	server_addr.sin_port = htons(port);
+	server_addr.sin_addr = *((struct in_addr *)host->h_addr);
+	rt_memset(&(server_addr.sin_zero), 0, sizeof(server_addr.sin_zero));
+
+	if (connect(sock, (struct sockaddr *)&server_addr, sizeof(struct sockaddr)) == -1)
+	{
+		rt_kprintf("Connect error\n");
+
+        /* release recv buffer */
+        rt_free(recv_data);
+		return;
+	}
+
+	while(1)
+	{
+		bytes_received = recv(sock, recv_data, 1024, 0);
+		if (bytes_received < 0)
+		{
+		    lwip_close(sock);
+
+            /* release recv buffer */
+            rt_free(recv_data);
+			break;
+		}
+
+		recv_data[bytes_received] = '\0';
+
+		if (strcmp(recv_data , "q") == 0 || strcmp(recv_data , "Q") == 0)
+		{
+			lwip_close(sock);
+
+            /* release recv buffer */
+            rt_free(recv_data);
+			break;
+		}
+		else
+		{
+			rt_kprintf("\nRecieved data = %s " , recv_data);
+		}
+
+		send(sock,send_data,strlen(send_data), 0);
+	}
+
+	return;
+}
+
+#ifdef RT_USING_FINSH
+#include <finsh.h>
+FINSH_FUNCTION_EXPORT(tcpclient, startup tcp client);
+#endif