11 files changed, 515 insertions, 351 deletions

diff --git a/examples/file/listdir.c b/examples/file/listdir.c
index cf91bc77d4..d8ea7af82a 100644
--- a/examples/file/listdir.c
+++ b/examples/file/listdir.c
@@ -1,56 +1,85 @@
 /*
- * File      : listdir.c
- * This file is part of RT-TestCase in RT-Thread RTOS
- * COPYRIGHT (C) 2010, RT-Thread Development Team
+ * Copyright (c) 2006-2020, RT-Thread Development Team
  *
- * The license and distribution terms for this file may be
- * found in the file LICENSE in this distribution or at
- * http://www.rt-thread.org/license/LICENSE
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
  * 2010-02-10     Bernard      first version
+ * 2020-04-12     Jianjia Ma   add msh cmd
  */
 #include <rtthread.h>
 #include <dfs_posix.h>
 
-static char fullpath[256];
 void list_dir(const char* path)
 {
-	DIR *dir;
+    char * fullpath;
+    DIR *dir;
 
-	dir = opendir(path);
-	if (dir != RT_NULL)
-	{
-		struct dirent* dirent;
-		struct stat s;
+    dir = opendir(path);
+    if (dir != RT_NULL)
+    {
+        struct dirent* dirent;
+        struct stat s;
 
-		do
-		{
-			dirent = readdir(dir);
-			if (dirent == RT_NULL) break;
-			rt_memset(&s, 0, sizeof(struct stat));
+        fullpath = rt_malloc(256);
+        if (fullpath == RT_NULL)
+        {
+            closedir(dir);
+            rt_kprintf("no memory\n");
+            return;
+        }
 
-			/* build full path for each file */
-			rt_sprintf(fullpath, "%s/%s", path, dirent->d_name);
+        do
+        {
+            dirent = readdir(dir);
+            if (dirent == RT_NULL) break;
+            rt_memset(&s, 0, sizeof(struct stat));
 
-			stat(fullpath, &s);
-			if ( s.st_mode & DFS_S_IFDIR )
-			{
-				rt_kprintf("%s\t\t<DIR>\n", dirent->d_name);
-			}
-			else
-			{
-				rt_kprintf("%s\t\t%lu\n", dirent->d_name, s.st_size);
-			}
-		} while (dirent != RT_NULL);
+            /* build full path for each file */
+            rt_sprintf(fullpath, "%s/%s", path, dirent->d_name);
 
-		closedir(dir);
-	}
-	else rt_kprintf("open %s directory failed\n", path);
+            stat(fullpath, &s);
+            if ( s.st_mode & S_IFDIR )
+            {
+                rt_kprintf("%s\t\t<DIR>\n", dirent->d_name);
+            }
+            else
+            {
+                rt_kprintf("%s\t\t%lu\n", dirent->d_name, s.st_size);
+            }
+        } while (dirent != RT_NULL);
+
+        closedir(dir);
+    }
+    else
+    {
+        rt_kprintf("open %s directory failed\n", path);
+    }
+
+    rt_free(fullpath);
 }
 
 #ifdef RT_USING_FINSH
 #include <finsh.h>
 FINSH_FUNCTION_EXPORT(list_dir, list directory);
-#endif
+
+#ifdef FINSH_USING_MSH
+static void cmd_list_dir(int argc, char *argv[])
+{
+    char* filename;
+
+    if(argc == 2)
+    {
+        filename = argv[1];
+    }
+    else
+    {
+        rt_kprintf("Usage: list_dir [file_path]\n");
+        return;
+    }
+    list_dir(filename);
+}
+FINSH_FUNCTION_EXPORT_ALIAS(cmd_list_dir, __cmd_list_dir, list directory);
+#endif /* FINSH_USING_MSH */
+#endif /* RT_USING_FINSH */
diff --git a/examples/file/readspeed.c b/examples/file/readspeed.c
index 52f15b627b..e5073856b4 100644
--- a/examples/file/readspeed.c
+++ b/examples/file/readspeed.c
@@ -1,15 +1,12 @@
 /*
- * File      : readspeed.c
- * This file is part of RT-TestCase in RT-Thread RTOS
- * COPYRIGHT (C) 2010, RT-Thread Development Team
+ * Copyright (c) 2006-2020, RT-Thread Development Team
  *
- * The license and distribution terms for this file may be
- * found in the file LICENSE in this distribution or at
- * http://www.rt-thread.org/license/LICENSE
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
  * 2010-02-10     Bernard      first version
+ * 2020-04-12     Jianjia Ma   add msh cmd
  */
 
 #include <rtthread.h>
@@ -34,7 +31,6 @@ void readspeed(const char* filename, int block_size)
     {
         rt_kprintf("no memory\n");
         close(fd);
-
         return;
     }
 
@@ -61,4 +57,31 @@ void readspeed(const char* filename, int block_size)
 #ifdef RT_USING_FINSH
 #include <finsh.h>
 FINSH_FUNCTION_EXPORT(readspeed, perform file read test);
-#endif
+
+#ifdef FINSH_USING_MSH
+static void cmd_readspeed(int argc, char *argv[])
+{
+    char* filename;
+    int block_size;
+
+    if(argc == 3)
+    {
+        filename = argv[1];
+        block_size = atoi(argv[2]);
+    }
+    else if(argc == 2)
+    {
+        filename = argv[1];
+        block_size = 512;
+    }
+    else
+    {
+       rt_kprintf("Usage:\nreadspeed [file_path] [block_size]\n");
+       rt_kprintf("readspeed [file_path] with default block size 512\n");
+       return;
+    }
+    readspeed(filename, block_size);
+}
+FINSH_FUNCTION_EXPORT_ALIAS(cmd_readspeed, __cmd_readspeed, test file system read speed);
+#endif /* FINSH_USING_MSH */
+#endif /* RT_USING_FINSH */
diff --git a/examples/file/readwrite.c b/examples/file/readwrite.c
index 6f25249c61..5738323805 100644
--- a/examples/file/readwrite.c
+++ b/examples/file/readwrite.c
@@ -1,123 +1,168 @@
 /*
- * 代码清单：文件读写例子
+ * Copyright (c) 2006-2020, RT-Thread Development Team
  *
- * 这个例子演示了如何读写一个文件，特别是写的时候应该如何操作。
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2010-02-10     Bernard      first version
+ * 2020-04-12     Jianjia Ma   add msh cmd
  */
 
 #include <rtthread.h>
-#include <dfs_posix.h> /* 当需要使用文件操作时，需要包含这个头文件 */
-
-#define TEST_FN		"/test.dat"
+#include <dfs_posix.h>
 
-/* 测试用的数据和缓冲 */
-static char test_data[120], buffer[120];
+#define TEST_DATA_LEN     120
 
-/* 文件读写测试 */
+/* file read write test */
 void readwrite(const char* filename)
 {
 	int fd;
 	int index, length;
+	char* test_data;
+	char* buffer;
+	int block_size = TEST_DATA_LEN;
 
-	/* 只写 & 创建 打开 */
-	fd = open(TEST_FN, O_WRONLY | O_CREAT | O_TRUNC, 0);
+	/* open with write only & create */
+	fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0);
 	if (fd < 0)
 	{
 		rt_kprintf("open file for write failed\n");
 		return;
 	}
 
-	/* 准备写入数据 */
-	for (index = 0; index < sizeof(test_data); index ++)
+	test_data = rt_malloc(block_size);
+    if (test_data == RT_NULL)
+    {
+        rt_kprintf("no memory\n");
+        close(fd);
+        return;
+    }
+
+    buffer = rt_malloc(block_size);
+    if (buffer == RT_NULL)
+    {
+        rt_kprintf("no memory\n");
+        close(fd);
+        rt_free(test_data);
+        return;
+    }
+
+	/* prepare some data */
+	for (index = 0; index < block_size; index ++)
 	{
 		test_data[index] = index + 27;
 	}
 
-	/* 写入数据 */
-	length = write(fd, test_data, sizeof(test_data));
-	if (length != sizeof(test_data))
+	/* write to file */
+	length = write(fd, test_data, block_size);
+	if (length != block_size)
 	{
 		rt_kprintf("write data failed\n");
 		close(fd);
-		return;
+		goto __exit;
 	}
 
-	/* 关闭文件 */
+	/* close file */
 	close(fd);
 
-	/* 只写并在末尾添加打开 */
-	fd = open(TEST_FN, O_WRONLY | O_CREAT | O_APPEND, 0);
+	/* reopen the file with append to the end */
+	fd = open(filename, O_WRONLY | O_CREAT | O_APPEND, 0);
 	if (fd < 0)
 	{
 		rt_kprintf("open file for append write failed\n");
-		return;
+		goto __exit;;
 	}
 
-	length = write(fd, test_data, sizeof(test_data));
-	if (length != sizeof(test_data))
+	length = write(fd, test_data, block_size);
+	if (length != block_size)
 	{
 		rt_kprintf("append write data failed\n");
 		close(fd);
-		return;
+		goto __exit;
 	}
-	/* 关闭文件 */
+	/* close the file */
 	close(fd);
 
-	/* 只读打开进行数据校验 */
-	fd = open(TEST_FN, O_RDONLY, 0);
+	/* open the file for data validation. */
+	fd = open(filename, O_RDONLY, 0);
 	if (fd < 0)
 	{
 		rt_kprintf("check: open file for read failed\n");
-		return;
+		goto __exit;
 	}
 
-	/* 读取数据(应该为第一次写入的数据) */
-	length = read(fd, buffer, sizeof(buffer));
-	if (length != sizeof(buffer))
+	/* read the data (should be the data written by the first time ) */
+	length = read(fd, buffer, block_size);
+	if (length != block_size)
 	{
 		rt_kprintf("check: read file failed\n");
 		close(fd);
-		return;
+		goto __exit;
 	}
 
-	/* 检查数据是否正确 */
-	for (index = 0; index < sizeof(test_data); index ++)
+	/* validate */
+	for (index = 0; index < block_size; index ++)
 	{
 		if (test_data[index] != buffer[index])
 		{
 			rt_kprintf("check: check data failed at %d\n", index);
 			close(fd);
-			return;
+			goto __exit;
 		}
 	}
 
-	/* 读取数据(应该为第二次写入的数据) */
-	length = read(fd, buffer, sizeof(buffer));
-	if (length != sizeof(buffer))
+	/* read the data (should be the second time data) */
+	length = read(fd, buffer, block_size);
+	if (length != block_size)
 	{
 		rt_kprintf("check: read file failed\n");
 		close(fd);
-		return;
+		goto __exit;
 	}
 
-	/* 检查数据是否正确 */
-	for (index = 0; index < sizeof(test_data); index ++)
+	/* validate */
+	for (index = 0; index < block_size; index ++)
 	{
 		if (test_data[index] != buffer[index])
 		{
 			rt_kprintf("check: check data failed at %d\n", index);
 			close(fd);
-			return;
+			goto __exit;
 		}
 	}
 
-	/* 检查数据完毕，关闭文件 */
+	/* close the file */
 	close(fd);
-	/* 打印结果 */
-	rt_kprintf("read/write done.\n");
+	/* print result */
+	rt_kprintf("read/write test successful!\n");
+
+__exit:
+    rt_free(test_data);
+    rt_free(buffer);
 }
 
 #ifdef RT_USING_FINSH
 #include <finsh.h>
-/* 输出函数到finsh shell命令行中 */
+/* export to finsh */
 FINSH_FUNCTION_EXPORT(readwrite, perform file read and write test);
-#endif
+
+#ifdef FINSH_USING_MSH
+static void cmd_readwrite(int argc, char *argv[])
+{
+    char* filename;
+
+    if(argc == 2)
+    {
+        filename = argv[1];
+    }
+    else
+    {
+        rt_kprintf("Usage: readwrite [file_path]\n");
+        return;
+    }
+    readwrite(filename);
+}
+FINSH_FUNCTION_EXPORT_ALIAS(cmd_readwrite, __cmd_readwrite, perform file read and write test);
+#endif /* FINSH_USING_MSH */
+#endif /* RT_USING_FINSH */
diff --git a/examples/file/seekdir.c b/examples/file/seekdir.c
index 1cf8b5fd78..d6a33426b4 100644
--- a/examples/file/seekdir.c
+++ b/examples/file/seekdir.c
@@ -1,15 +1,12 @@
 /*
- * File      : seekdir.c
- * This file is part of RT-TestCase in RT-Thread RTOS
- * COPYRIGHT (C) 2011, RT-Thread Development Team
+ * Copyright (c) 2006-2020, RT-Thread Development Team
  *
- * The license and distribution terms for this file may be
- * found in the file LICENSE in this distribution or at
- * http://www.rt-thread.org/license/LICENSE
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
  * 2011-06-02     Bernard      first version
+ * 2020-04-12     Jianjia Ma   add msh cmd
  */
 #include <dfs_posix.h>
 
@@ -17,7 +14,6 @@ void seekdir_test(void)
 {
 	DIR * dirp;
 	long save3 = 0;
-	long cur;
 	int i = 0;
 	struct dirent *dp;
 
@@ -27,14 +23,14 @@ void seekdir_test(void)
 	{
 		rt_kprintf("direntry: %s\n", dp->d_name);
 
-		/* ���������Ŀ¼���Ŀ¼ָ�� */
+		/* save the pointer of the third directory */
 		if (i++ == 3)
 		{
 			save3 = telldir(dirp);
 		}
 	}
 
-	/* �ص��ղű���ĵ�����Ŀ¼���Ŀ¼ָ�� */
+	/* get back to the third directory */
 	seekdir (dirp, save3);
 	rt_kprintf("seek dientry to: %d\n", save3);
 	for (dp = readdir(dirp); dp != RT_NULL; dp = readdir(dirp))
@@ -42,9 +38,12 @@ void seekdir_test(void)
 		rt_kprintf("direntry: %s\n", dp->d_name);
 	}
 
-	/* �ر�Ŀ¼ */
+	/* close the directory */
 	closedir (dirp);
 } 
 
+#ifdef RT_USING_FINSH
 #include <finsh.h>
 FINSH_FUNCTION_EXPORT(seekdir_test, perform directory seek test);
+MSH_CMD_EXPORT(seekdir_test, perform directory seek test);
+#endif /* RT_USING_FINSH */
diff --git a/examples/file/writespeed.c b/examples/file/writespeed.c
index ab6946888f..60dd900a68 100644
--- a/examples/file/writespeed.c
+++ b/examples/file/writespeed.c
@@ -1,15 +1,12 @@
 /*
- * File      : writespeed.c
- * This file is part of RT-TestCase in RT-Thread RTOS
- * COPYRIGHT (C) 2010, RT-Thread Development Team
+ * Copyright (c) 2006-2020, RT-Thread Development Team
  *
- * The license and distribution terms for this file may be
- * found in the file LICENSE in this distribution or at
- * http://www.rt-thread.org/license/LICENSE
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
  * 2010-02-10     Bernard      first version
+ * 2020-04-12     Jianjia Ma   add msh cmd
  */
 #include <rtthread.h>
 #include <dfs_posix.h>
@@ -32,35 +29,34 @@ void writespeed(const char* filename, int total_length, int block_size)
     {
         rt_kprintf("no memory\n");
         close(fd);
-
         return;
     }
 
-	/* prepare write data */
-	for (index = 0; index < block_size; index++)
-	{
-		buff_ptr[index] = index;
-	}
-	index = 0;
+    /* prepare write data */
+    for (index = 0; index < block_size; index++)
+    {
+        buff_ptr[index] = index;
+    }
+    index = 0;
 
-	/* get the beginning tick */
+    /* get the beginning tick */
     tick = rt_tick_get();
-	while (index < total_length / block_size)
-	{
-		length = write(fd, buff_ptr, block_size);
-		if (length != block_size)
-		{
-			rt_kprintf("write failed\n");
-			break;
-		}
+    while (index < total_length / block_size)
+    {
+        length = write(fd, buff_ptr, block_size);
+        if (length != block_size)
+        {
+            rt_kprintf("write failed\n");
+            break;
+        }
 
-		index ++;
-	}
+        index ++;
+    }
     tick = rt_tick_get() - tick;
 
-	/* close file and release memory */
+    /* close file and release memory */
     close(fd);
-	rt_free(buff_ptr);
+    rt_free(buff_ptr);
 
     /* calculate write speed */
     rt_kprintf("File write speed: %d byte/s\n", total_length / tick * RT_TICK_PER_SECOND);
@@ -69,4 +65,34 @@ void writespeed(const char* filename, int total_length, int block_size)
 #ifdef RT_USING_FINSH
 #include <finsh.h>
 FINSH_FUNCTION_EXPORT(writespeed, perform file write test);
-#endif
+
+#ifdef FINSH_USING_MSH
+static void cmd_writespeed(int argc, char *argv[])
+{
+    char* filename;
+    int length;
+    int block_size;
+
+    if(argc == 4)
+    {
+        filename = argv[1];
+        length = atoi(argv[2]);
+        block_size = atoi(argv[3]);
+    }
+    else if(argc == 2)
+    {
+        filename = argv[1];
+        block_size = 512;
+        length = 1024*1024;
+    }
+    else
+    {
+       rt_kprintf("Usage:\nwritespeed [file_path] [length] [block_size]\n");
+       rt_kprintf("writespeed [file_path] with default length 1MB and block size 512\n");
+       return;
+    }
+    writespeed(filename, length, block_size);
+}
+FINSH_FUNCTION_EXPORT_ALIAS(cmd_writespeed, __cmd_writespeed, test file system write speed);
+#endif /* FINSH_USING_MSH */
+#endif /* RT_USING_FINSH */
diff --git a/examples/network/tcpclient.c b/examples/network/tcpclient.c
index 2059d9f17f..cc67645868 100644
--- a/examples/network/tcpclient.c
+++ b/examples/network/tcpclient.c
@@ -129,7 +129,7 @@ static void tcpclient(void *arg)
         ret = send(sock, send_data, rt_strlen(send_data), 0);
         if (ret < 0)
         {
-            /* 接收失败，关闭这个连接 */
+            /* 发送失败，关闭这个连接 */
             LOG_I("send error, close the socket.");
             goto __exit;
         }
diff --git a/examples/network/tcpsendpacket.c b/examples/network/tcpsendpacket.c
index 75134c19a2..47bb562506 100644
--- a/examples/network/tcpsendpacket.c
+++ b/examples/network/tcpsendpacket.c
@@ -1,7 +1,7 @@
 #include <rtthread.h>
 
-#include <netdb.h>   /* Ϊ�˽�������������Ҫ����netdb.hͷ�ļ� */
-#include <sys/socket.h> /* ʹ��BSD socket����Ҫ����socket.hͷ�ļ� */
+#include <netdb.h>   /* 为了解析主机名，需要包含netdb.h头文件 */
+#include <sys/socket.h> /* 使用BSD socket，需要包含socket.h头文件 */
 
 void tcp_senddata(const char *url, int port, int length)
 {
@@ -10,45 +10,52 @@ void tcp_senddata(const char *url, int port, int length)
     struct sockaddr_in server_addr;
     rt_uint8_t *buffer_ptr;
 
-    /* ͨ��������ڲ���url���host��ַ��������������������������� */
+    /* 通过函数入口参数url获得host地址（如果是域名，会做域名解析） */
     host = gethostbyname(url);
-    /* ����һ��socket��������SOCKET_STREAM��TCP���� */
+    /* 创建一个socket，类型是SOCKET_STREAM，TCP类型 */
     if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1)
     {
-        /* ����socketʧ�� */
+        /* 创建socket失败 */
         rt_kprintf("Socket error\n");
         return;
     }
 
-    /* �����ڴ� */
+    /* 申请内存 */
     buffer_ptr = rt_malloc(length);
-    /* ���췢������ */
+    if(RT_NULL == buffer_ptr)
+    {
+        /* 申请内存失败 */
+        rt_kprintf("No memory\n");
+        return;        
+    }
+    
+    /* 构造发送数据 */
     for (index = 0; index < length; index ++)
         buffer_ptr[index] = index & 0xff;
 
     timeout = 100;
-    /* ���÷��ͳ�ʱʱ��100ms */
+    /* 设置发送超时时间100ms */
     setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &timeout, sizeof(timeout));
-    /* ��ʼ��Ԥ���ӵķ���˵�ַ */
+    /* 初始化预连接的服务端地址 */
     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));
 
-    /* ���ӵ������ */
+    /* 连接到服务端 */
     err = connect(sock, (struct sockaddr *)&server_addr, sizeof(struct sockaddr));
     rt_kprintf("TCP thread connect error code: %d\n", err);
 
     while (1)
     {
-        /* �������ݵ�sock���� */
+        /* 发送数据到sock连接 */
         result = send(sock, buffer_ptr, length, MSG_DONTWAIT);
-        if (result < 0) //���ݷ��ʹ�����
+        if (result < 0) //数据发送错误处理
         {
             rt_kprintf("TCP thread send error: %d\n", result);
             closesocket(sock);
 
-            /* �ر����ӣ����´������� */
+            /* 关闭连接，重新创建连接 */
             rt_thread_delay(10);
 
             if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1)
@@ -59,7 +66,7 @@ void tcp_senddata(const char *url, int port, int length)
         }
         else if (result == 0)
         {
-            /* ��ӡsend��������ֵΪ0�ľ�����Ϣ */
+            /* 打印send函数返回值为0的警告信息 */
             rt_kprintf("\n Send warning,send function return 0.\r\n");
         }
     }
@@ -67,7 +74,7 @@ void tcp_senddata(const char *url, int port, int length)
 
 #ifdef RT_USING_FINSH
 #include <finsh.h>
-/* ���tcpclient������finsh shell�� */
+/* 输出tcpclient函数到finsh shell中 */
 FINSH_FUNCTION_EXPORT(tcp_senddata, send a packet through tcp connection);
 #endif
 
diff --git a/examples/network/tcpserver.c b/examples/network/tcpserver.c
index c019ec132f..8c7382dcbb 100644
--- a/examples/network/tcpserver.c
+++ b/examples/network/tcpserver.c
@@ -229,8 +229,8 @@ static void tcpserver_test(int argc, char** argv)
         {
             if (started)
             {
-                LOG_I("The tcpclient has started!");
-                LOG_I("Please stop tcpclient firstly, by: tcpclient --stop");
+                LOG_I("The tcpserver has started!");
+                LOG_I("Please stop tcpserver firstly, by: tcpserver --stop");
                 return;
             }
 
diff --git a/examples/network/udpclient.c b/examples/network/udpclient.c
index cd870cd758..f8c42f3a12 100644
--- a/examples/network/udpclient.c
+++ b/examples/network/udpclient.c
@@ -89,7 +89,7 @@ static void usage(void)
     rt_kprintf("  -h           Specify host address\n");
     rt_kprintf("  -p           Specify the host port number\n");
     rt_kprintf("  --cnt        Specify the send data count\n");
-    rt_kprintf("  --stop       Stop tcpclient program\n");
+    rt_kprintf("  --stop       Stop udpclient program\n");
     rt_kprintf("  --help       Print help information\n");
 }
 
@@ -117,8 +117,8 @@ static void udpclient_test(int argc, char** argv)
         {
             if (started)
             {
-                LOG_I("The tcpclient has started!");
-                LOG_I("Please stop tcpclient firstly, by: tcpclient --stop");
+                LOG_I("The udpclient has started!");
+                LOG_I("Please stop udpclient firstly, by: udpclient --stop");
                 return;
             }
 
diff --git a/examples/network/udpserver.c b/examples/network/udpserver.c
index ed63363189..a249475e04 100644
--- a/examples/network/udpserver.c
+++ b/examples/network/udpserver.c
@@ -163,8 +163,8 @@ static void udpserver_test(int argc, char** argv)
         {
             if (started)
             {
-                LOG_I("The tcpclient has started!");
-                LOG_I("Please stop tcpclient firstly, by: tcpclient --stop");
+                LOG_I("The udpserver has started!");
+                LOG_I("Please stop udpserver firstly, by: udpserver --stop");
                 return;
             }
 
diff --git a/examples/test/net_test.c b/examples/test/net_test.c
index 53bd2836fa..553305f4d0 100644
--- a/examples/test/net_test.c
+++ b/examples/test/net_test.c
@@ -14,41 +14,51 @@
 rt_thread_t udpecho_tid = RT_NULL;
 void udpecho_entry(void *parameter)
 {
-	struct netconn *conn;
-	struct netbuf *buf;
-	struct ip_addr *addr;
-	unsigned short port;
+    struct netconn *conn;
+    struct netbuf *buf;
+    struct ip_addr *addr;
+    unsigned short port;
 
-	conn = netconn_new(NETCONN_UDP);
-	netconn_bind(conn, IP_ADDR_ANY, 7);
+    conn = netconn_new(NETCONN_UDP);
+    if(conn == NULL)
+    {
+        rt_kprintf("no memory error\n");
+        return;
+    }
+    netconn_bind(conn, IP_ADDR_ANY, 7);
 
-	while(1)
-	{
+    while(1)
+    {
         /* received data to buffer */
 #if LWIP_VERSION_MINOR==3U 
-		buf = netconn_recv(conn);
+        buf = netconn_recv(conn);
 #else
-		netconn_recv(conn, &buf);
+        netconn_recv(conn, &buf);
 #endif
-		
-		addr = netbuf_fromaddr(buf);
-		port = netbuf_fromport(buf);
+        if(buf == NULL)	
+        {
+            break;
+        }
+        addr = netbuf_fromaddr(buf);
+        port = netbuf_fromport(buf);
 
-   		 /* send the data to buffer */
-		netconn_connect(conn, addr, port);
+        /* send the data to buffer */
+        netconn_connect(conn, addr, port);
 
-		/* reset address, and send to client */
+        /* reset address, and send to client */
 #if LWIP_VERSION_MINOR==3U 		
-		buf->addr = RT_NULL;
+        buf->addr = RT_NULL;
 #else
-		buf->addr = *IP_ADDR_ANY;
+        buf->addr = *IP_ADDR_ANY;
 #endif
 		
-		netconn_send(conn, buf);
+        netconn_send(conn, buf);
 		
-		/* release buffer */
-		netbuf_delete(buf);
-	}
+        /* release buffer */
+        netbuf_delete(buf);
+    }
+	
+    netconn_delete(conn);
 }
 /*
  * UDP socket echo server
@@ -58,57 +68,57 @@ void udpecho_entry(void *parameter)
 rt_thread_t udpecho_socket_tid = RT_NULL;
 void udpecho_socket_entry(void *parameter)
 {
-	int sock;
-	int bytes_read;
-	char *recv_data;
-	rt_uint32_t addr_len;
-	struct sockaddr_in server_addr, client_addr;
-
-	/* allocate the data buffer */
-	recv_data = rt_malloc(UDP_SOCKET_BUFFER_SIZE);
-	if (recv_data == RT_NULL)
-	{
-		/* no memory yet */
-		rt_kprintf("no memory\n");
-		goto _exit;
-	}
-	/* create a UDP socket */
-	if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
-	{
-		rt_kprintf("create socket error\n");
-		goto _exit;
-	}
+    int sock;
+    int bytes_read;
+    char *recv_data;
+    rt_uint32_t addr_len;
+    struct sockaddr_in server_addr, client_addr;
 
-	/* initialize server address */
-	server_addr.sin_family = AF_INET;
-	server_addr.sin_port = htons(UDP_SOCKET_ECHO_PORT);
-	server_addr.sin_addr.s_addr = INADDR_ANY;
-	rt_memset(&(server_addr.sin_zero),0, sizeof(server_addr.sin_zero));
+    /* allocate the data buffer */
+    recv_data = rt_malloc(UDP_SOCKET_BUFFER_SIZE);
+    if (recv_data == RT_NULL)
+    {
+        /* no memory yet */
+        rt_kprintf("no memory\n");
+        return;
+    }
+    /* create a UDP socket */
+    if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
+    {
+        rt_kprintf("create socket error\n");
+        goto _exit;
+    }
 
-	/* bind socket to server address */
-	if (bind(sock,(struct sockaddr *)&server_addr,
-			sizeof(struct sockaddr)) == -1)
-	{
-		/* bind failed */
-		rt_kprintf("bind error\n");
-		goto _exit;
-	}
+    /* initialize server address */
+    server_addr.sin_family = AF_INET;
+    server_addr.sin_port = htons(UDP_SOCKET_ECHO_PORT);
+    server_addr.sin_addr.s_addr = INADDR_ANY;
+    rt_memset(&(server_addr.sin_zero),0, sizeof(server_addr.sin_zero));
 
-	addr_len = sizeof(struct sockaddr);
-	while (1)
-	{
-		/* try to receive from UDP socket */
-		bytes_read = recvfrom(sock, recv_data, UDP_SOCKET_BUFFER_SIZE, 0,
-							 (struct sockaddr *)&client_addr, &addr_len);
+    /* bind socket to server address */
+    if (bind(sock,(struct sockaddr *)&server_addr,
+        sizeof(struct sockaddr)) == -1)
+    {
+        /* bind failed */
+        rt_kprintf("bind error\n");
+        goto _exit;
+    }
 
-		/* send back */
-		sendto(sock, recv_data, bytes_read, 0,
-			(struct sockaddr *)&client_addr, addr_len);
-	}
+    addr_len = sizeof(struct sockaddr);
+    while (1)
+    {
+        /* try to receive from UDP socket */
+        bytes_read = recvfrom(sock, recv_data, UDP_SOCKET_BUFFER_SIZE, 0,
+            (struct sockaddr *)&client_addr, &addr_len);
+	    
+        /* send back */
+        sendto(sock, recv_data, bytes_read, 0,
+            (struct sockaddr *)&client_addr, addr_len);
+    }
 
 _exit:
-	rt_free(recv_data);
-	return;
+    rt_free(recv_data);
+    return;
 }
 
 /*
@@ -118,52 +128,62 @@ _exit:
 rt_thread_t tcpecho_tid = RT_NULL;
 void tcpecho_entry(void *parameter)
 {
-	struct netconn *conn, *newconn;
-	err_t err;
+    struct netconn *conn, *newconn;
+    err_t err;
 
-	/* Create a new connection identifier. */
-	conn = netconn_new(NETCONN_TCP);
+    /* Create a new connection identifier. */
+    conn = netconn_new(NETCONN_TCP);
+    if(conn == NULL)
+    {
+        rt_kprintf("no memory error\n");
+        return;
+    }
 
-	/* Bind connection to well known port number 7. */
-	netconn_bind(conn, NULL, TCP_ECHO_PORT);
+    /* Bind connection to well known port number 7. */
+    netconn_bind(conn, NULL, TCP_ECHO_PORT);
 
-	/* Tell connection to go into listening mode. */
-	netconn_listen(conn);
+    /* Tell connection to go into listening mode. */
+    netconn_listen(conn);
 
-	while(1)
-	{
-		/* Grab new connection. */
+    while(1)
+    {
+        /* Grab new connection. */
 #if LWIP_VERSION_MINOR==3U 
-		newconn = netconn_accept(conn);
-		if(newconn != NULL)
+        newconn = netconn_accept(conn);
+        if(newconn != NULL)
 #else
-		err = netconn_accept(conn, &newconn);
-		if(err == ERR_OK)
+        err = netconn_accept(conn, &newconn);
+        if(err == ERR_OK)
 #endif
-		/* Process the new connection. */
-		{
-			struct netbuf *buf;
-			void *data;
-			u16_t len;
+        /* Process the new connection. */
+        {
+            struct netbuf *buf;
+            void *data;
+            u16_t len;
 #if LWIP_VERSION_MINOR==3U
-			while((buf = netconn_recv(newconn)) != NULL)
+            while((buf = netconn_recv(newconn)) != NULL)
 #else
-			while((err = netconn_recv(newconn, &buf)) == ERR_OK)
+            while((err = netconn_recv(newconn, &buf)) == ERR_OK)
 #endif
-			{
-				do
-				{
-					netbuf_data(buf, &data, &len);
-					err = netconn_write(newconn, data, len, NETCONN_COPY);
-					if(err != ERR_OK){}
-				}
-				while(netbuf_next(buf) >= 0);
-				netbuf_delete(buf);
-			}
-			/* Close connection and discard connection identifier. */
-			netconn_delete(newconn);
-		}
-	}
+            {
+                do
+                {
+                    netbuf_data(buf, &data, &len);
+                    err = netconn_write(newconn, data, len, NETCONN_COPY);
+                    if(err != ERR_OK)
+                    {
+                        break;			    
+                    }
+                }while(netbuf_next(buf) >= 0);
+		    
+                netbuf_delete(buf);
+            }
+            /* Close connection and discard connection identifier. */
+            netconn_delete(newconn);
+        }
+    }
+	
+    netconn_delete(conn);
 }
 
 /*
@@ -174,84 +194,83 @@ void tcpecho_entry(void *parameter)
 rt_thread_t tcpecho_socket_tid = RT_NULL;
 void tcpecho_socket_entry(void *parameter)
 {
-   char *recv_data;
-   rt_uint32_t sin_size;
-   int sock = -1, connected, bytes_received;
-   struct sockaddr_in server_addr, client_addr;
+    char *recv_data;
+    rt_uint32_t sin_size;
+    int sock = -1, connected, bytes_received;
+    struct sockaddr_in server_addr, client_addr;
 
-	recv_data = rt_malloc(TCP_SOCKET_BUFFER_SIZE);
-	if (recv_data == RT_NULL)
-	{
-		rt_kprintf("no memory\n");
-		goto _exit;
-	}
+    recv_data = rt_malloc(TCP_SOCKET_BUFFER_SIZE);
+    if (recv_data == RT_NULL)
+    {
+        rt_kprintf("no memory\n");
+        return;
+    }
 
-	/* create a TCP socket */
-	if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1)
-	{
-		rt_kprintf("create socket error\n");
-		goto _exit;
-	}
+    /* create a TCP socket */
+    if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1)
+    {
+        rt_kprintf("create socket error\n");
+        goto _exit;
+    }
 
-	/* initialize server address */
-	server_addr.sin_family = AF_INET;
-	server_addr.sin_port = htons(TCP_SOCKET_ECHO_PORT);
-	server_addr.sin_addr.s_addr = INADDR_ANY;
-	rt_memset(&(server_addr.sin_zero),8, sizeof(server_addr.sin_zero));
+    /* initialize server address */
+    server_addr.sin_family = AF_INET;
+    server_addr.sin_port = htons(TCP_SOCKET_ECHO_PORT);
+    server_addr.sin_addr.s_addr = INADDR_ANY;
+    rt_memset(&(server_addr.sin_zero),8, sizeof(server_addr.sin_zero));
 
-	/* bind to server address */
-	if (bind(sock, (struct sockaddr *)&server_addr, sizeof(struct sockaddr)) == -1)
-	{
-		rt_kprintf("bind address failed\n");
-		goto _exit;
-   }
+    /* bind to server address */
+    if (bind(sock, (struct sockaddr *)&server_addr, sizeof(struct sockaddr)) == -1)
+    {
+        rt_kprintf("bind address failed\n");
+        goto _exit;
+    }
 
-	/* listen */
-	if (listen(sock, 5) == -1)
-	{
-		rt_kprintf("listen error\n");
-		goto _exit;
-	}
+    /* listen */
+    if (listen(sock, 5) == -1)
+    {
+        rt_kprintf("listen error\n");
+        goto _exit;
+    }
 
-	sin_size = sizeof(struct sockaddr_in);
-	while(1)
-	{
-		/* accept client connected */
-		connected = accept(sock, (struct sockaddr *)&client_addr, &sin_size);
-		if (connected > 0)
-		{
-			int timeout;
+    sin_size = sizeof(struct sockaddr_in);
+    while(1)
+    {
+        /* accept client connected */
+        connected = accept(sock, (struct sockaddr *)&client_addr, &sin_size);
+        if (connected > 0)
+        {
+            int timeout;
 			
-			/* set timeout option */
-			timeout = 5000; /* 5second */
-			setsockopt(connected, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout));
+            /* set timeout option */
+            timeout = 5000; /* 5second */
+            setsockopt(connected, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout));
 
-			/* handle this client */
-			while (1)
-			{
-				/* receive data from this connection */
-				bytes_received = recv(connected,recv_data, TCP_SOCKET_BUFFER_SIZE, 0);
-				if (bytes_received <= 0)
-				{
-					rt_kprintf("close client connection, errno: %d\n", 
-						rt_get_errno());
-					/* connection closed. */
-					lwip_close(connected);
-					break;
-				}
+            /* handle this client */
+            while (1)
+            {
+                /* receive data from this connection */
+                bytes_received = recv(connected,recv_data, TCP_SOCKET_BUFFER_SIZE, 0);
+                if (bytes_received <= 0)
+                {
+                    rt_kprintf("close client connection, errno: %d\n", rt_get_errno());
+                    /* connection closed. */
+                    lwip_close(connected);
+                    break;
+                }
 
-				/* send data to client */
-				send(connected, recv_data, bytes_received, 0);
-			}
-		}
-   }
+                /* send data to client */
+                send(connected, recv_data, bytes_received, 0);
+            }
+        }
+    }
 
 _exit:
-	/* close socket */
-	if (sock != -1) lwip_close(sock);
-	rt_free(recv_data);
+    /* close socket */
+    if (sock != -1) lwip_close(sock);
+    rt_free(recv_data);
 
-	return ;
+    return;
 }
 
 /*
@@ -261,40 +280,56 @@ _exit:
 /* network test utilities entry */
 void net_test(void)
 {
-	/* start UDP echo server */
-	if (udpecho_tid == RT_NULL)
-	{
-		udpecho_tid = rt_thread_create("uecho",
-									udpecho_entry, RT_NULL,
-									512, RT_THREAD_PRIORITY_MAX/2, 5);
-		if (udpecho_tid != RT_NULL)
-			rt_thread_startup(udpecho_tid);
-	}
-	if (udpecho_socket_tid == RT_NULL)
-	{
-		udpecho_socket_tid = rt_thread_create("uecho_s",
-									udpecho_socket_entry, RT_NULL,
-									512, RT_THREAD_PRIORITY_MAX/2 + 1, 5);
-		if (udpecho_socket_tid != RT_NULL)
-			rt_thread_startup(udpecho_socket_tid);
-	}
+    /* start UDP echo server */
+    if (udpecho_tid == RT_NULL)
+    {
+        udpecho_tid = rt_thread_create("uecho",
+                                       udpecho_entry,
+                                       RT_NULL, 
+                                       512, 
+                                       RT_THREAD_PRIORITY_MAX/2, 5);
+        if (udpecho_tid != RT_NULL)
+        {
+            rt_thread_startup(udpecho_tid);
+        }
+    }
 
-	if (tcpecho_tid == RT_NULL)
-	{
-		tcpecho_tid = rt_thread_create("techo",
-									tcpecho_entry, RT_NULL,
-									512, RT_THREAD_PRIORITY_MAX/2 + 2, 5);
-		if (tcpecho_tid != RT_NULL)
-			rt_thread_startup(tcpecho_tid);
-	}
-	if (tcpecho_socket_tid == RT_NULL)
-	{
-		tcpecho_socket_tid = rt_thread_create("techo_s",
-									tcpecho_socket_entry, RT_NULL,
-									512, RT_THREAD_PRIORITY_MAX/2 + 3, 5);
-		if (tcpecho_socket_tid != RT_NULL)
-			rt_thread_startup(tcpecho_socket_tid);
-	}
+    if (udpecho_socket_tid == RT_NULL)
+    {
+        udpecho_socket_tid = rt_thread_create("uecho_s",
+                                              udpecho_socket_entry,
+                                              RT_NULL,
+                                              512, 
+                                              RT_THREAD_PRIORITY_MAX/2 + 1, 5);
+        if (udpecho_socket_tid != RT_NULL)
+        {
+            rt_thread_startup(udpecho_socket_tid);
+        }
+    }
+
+    if (tcpecho_tid == RT_NULL)
+    {
+        tcpecho_tid = rt_thread_create("techo",
+                                       tcpecho_entry, 
+                                       RT_NULL,
+                                       512, 
+                                       RT_THREAD_PRIORITY_MAX/2 + 2, 5);
+        if (tcpecho_tid != RT_NULL)
+        {
+            rt_thread_startup(tcpecho_tid);
+        }
+    }
+	
+    if (tcpecho_socket_tid == RT_NULL)
+    {
+        tcpecho_socket_tid = rt_thread_create("techo_s",
+                                              tcpecho_socket_entry, 
+                                              RT_NULL,
+                                              512, 
+                                              RT_THREAD_PRIORITY_MAX/2 + 3, 5);
+    if (tcpecho_socket_tid != RT_NULL)
+    {
+        rt_thread_startup(tcpecho_socket_tid);
+    }
 }
 FINSH_FUNCTION_EXPORT(net_test, network test);
-