From cd039a8b49add8238c4e721bdebcaabcccdd99b9 Mon Sep 17 00:00:00 2001 From: "bernard.xiong" Date: Wed, 24 Mar 2010 15:26:48 +0000 Subject: add more Chinese comments. git-svn-id: https://rt-thread.googlecode.com/svn/trunk@536 bbd45198-f89e-11dd-88c7-29a3b14d5316 --- examples/network/tcpserver.c | 211 +++++++++++++++++++++++-------------------- 1 file changed, 112 insertions(+), 99 deletions(-) (limited to 'examples/network/tcpserver.c') diff --git a/examples/network/tcpserver.c b/examples/network/tcpserver.c index 606e842c8d..9fa7bc8fb8 100644 --- a/examples/network/tcpserver.c +++ b/examples/network/tcpserver.c @@ -1,109 +1,122 @@ #include -#include +#include /* 使用BSD Socket接口必须包含sockets.h这个头文件 */ -static const char send_data[] = "This is TCP Server from RT-Thread."; +static const char send_data[] = "This is TCP Server from RT-Thread."; /* 发送用到的数据 */ void tcpserv(void* parameter) { - char *recv_data; - rt_uint32_t sin_size; - int sock, connected, bytes_received; - struct sockaddr_in server_addr, client_addr; - rt_bool_t stop = RT_FALSE; - - recv_data = rt_malloc(1024); - if (recv_data == RT_NULL) - { - rt_kprintf("No memory\n"); - return; - } - - /* create a socket */ - if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) - { - rt_kprintf("Socket error\n"); - - /* release recv buffer */ - rt_free(recv_data); - return; - } - - /* init server address */ - server_addr.sin_family = AF_INET; - server_addr.sin_port = htons(5000); - server_addr.sin_addr.s_addr = INADDR_ANY; - rt_memset(&(server_addr.sin_zero),8, sizeof(server_addr.sin_zero)); - - /* bind socket */ - if (bind(sock, (struct sockaddr *)&server_addr, sizeof(struct sockaddr)) == -1) - { - rt_kprintf("Unable to bind\n"); - - /* release recv buffer */ - rt_free(recv_data); - return; - } - - /* listen socket */ - if (listen(sock, 5) == -1) - { - rt_kprintf("Listen error\n"); - - /* release recv buffer */ - rt_free(recv_data); - return; - } - - rt_kprintf("\nTCPServer Waiting for client on port 5000...\n"); - while(stop != RT_TRUE) - { - sin_size = sizeof(struct sockaddr_in); - - /* accept a client socket */ - connected = accept(sock, (struct sockaddr *)&client_addr, &sin_size); - - rt_kprintf("I got a connection from (%s , %d)\n", - inet_ntoa(client_addr.sin_addr),ntohs(client_addr.sin_port)); - - while (1) - { - send(connected, send_data, strlen(send_data), 0); - - bytes_received = recv(connected,recv_data, 1024, 0); - if (bytes_received < 0) - { - /* close socket */ - lwip_close(connected); - break; - } - - recv_data[bytes_received] = '\0'; - if (strcmp(recv_data , "q") == 0 || strcmp(recv_data , "Q") == 0) - { - lwip_close(connected); - break; - } - else if (strcmp(recv_data, "exit") == 0) - { - lwip_close(connected); - stop = RT_TRUE; - break; - } - else - { - rt_kprintf("RECIEVED DATA = %s \n" , recv_data); - } - } - } - - lwip_close(sock); - - /* release recv buffer */ - rt_free(recv_data); - - return ; + char *recv_data; /* 用于接收的指针，后面会做一次动态分配以请求可用内存 */ + rt_uint32_t sin_size; + int sock, connected, bytes_received; + struct sockaddr_in server_addr, client_addr; + rt_bool_t stop = RT_FALSE; /* 停止标志 */ + + recv_data = rt_malloc(1024); /* 分配接收用的数据缓冲 */ + if (recv_data == RT_NULL) + { + rt_kprintf("No memory\n"); + return; + } + + /* 一个socket在使用前，需要预先创建出来，指定SOCK_STREAM为TCP的socket */ + if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) + { + /* 创建失败的错误处理 */ + rt_kprintf("Socket error\n"); + + /* 释放已分配的接收缓冲 */ + rt_free(recv_data); + return; + } + + /* 初始化服务端地址 */ + server_addr.sin_family = AF_INET; + server_addr.sin_port = htons(5000); /* 服务端工作的端口 */ + server_addr.sin_addr.s_addr = INADDR_ANY; + rt_memset(&(server_addr.sin_zero),8, sizeof(server_addr.sin_zero)); + + /* 绑定socket到服务端地址 */ + if (bind(sock, (struct sockaddr *)&server_addr, sizeof(struct sockaddr)) == -1) + { + /* 绑定失败 */ + rt_kprintf("Unable to bind\n"); + + /* 释放已分配的接收缓冲 */ + rt_free(recv_data); + return; + } + + /* 在socket上进行监听 */ + if (listen(sock, 5) == -1) + { + rt_kprintf("Listen error\n"); + + /* release recv buffer */ + rt_free(recv_data); + return; + } + + rt_kprintf("\nTCPServer Waiting for client on port 5000...\n"); + while(stop != RT_TRUE) + { + sin_size = sizeof(struct sockaddr_in); + + /* 接受一个客户端连接socket的请求，这个函数调用是阻塞式的 */ + connected = accept(sock, (struct sockaddr *)&client_addr, &sin_size); + /* 返回的是连接成功的socket */ + + /* 接受返回的client_addr指向了客户端的地址信息 */ + rt_kprintf("I got a connection from (%s , %d)\n", + inet_ntoa(client_addr.sin_addr),ntohs(client_addr.sin_port)); + + /* 客户端连接的处理 */ + while (1) + { + /* 发送数据到connected socket */ + send(connected, send_data, strlen(send_data), 0); + + /* 从connected socket中接收数据，接收buffer是1024大小，但并不一定能够收到1024大小的数据 */ + bytes_received = recv(connected,recv_data, 1024, 0); + if (bytes_received < 0) + { + /* 接收失败，关闭这个connected socket */ + lwip_close(connected); + break; + } + + /* 有接收到数据，把末端清零 */ + recv_data[bytes_received] = '\0'; + if (strcmp(recv_data , "q") == 0 || strcmp(recv_data , "Q") == 0) + { + /* 如果是首字母是q或Q，关闭这个连接 */ + lwip_close(connected); + break; + } + else if (strcmp(recv_data, "exit") == 0) + { + /* 如果接收的是exit，则关闭整个服务端 */ + lwip_close(connected); + stop = RT_TRUE; + break; + } + else + { + /* 在控制终端显示收到的数据 */ + rt_kprintf("RECIEVED DATA = %s \n" , recv_data); + } + } + } + + /* 退出服务 */ + lwip_close(sock); + + /* 释放接收缓冲 */ + rt_free(recv_data); + + return ; } #ifdef RT_USING_FINSH #include +/* 输出tcpserv函数到finsh shell中 */ FINSH_FUNCTION_EXPORT(tcpserv, startup tcp server); #endif -- cgit v1.3.1