212 lines
5.7 KiB
C
212 lines
5.7 KiB
C
/*
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* Copyright (c) 2006-2023, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2022-01-24 ChungHsuan improve code comments
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*/
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#include <rtthread.h>
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#include <string.h>
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#if !defined(SAL_USING_POSIX)
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#error "Please enable SAL_USING_POSIX!"
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#else
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#include <sys/time.h>
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#include <sys/select.h>
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#endif
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#include <sys/socket.h> /* socket.h header file is needed when using BSD socket */ /* 使用BSD socket，需要包含socket.h头文件 */
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#include "netdb.h"
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#define DEBUG_TCP_CLIENT
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#define DBG_TAG "TCP"
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#ifdef DEBUG_TCP_CLIENT
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#define DBG_LVL DBG_LOG
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#else
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#define DBG_LVL DBG_INFO /* DBG_ERROR */
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#endif
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#include <rtdbg.h>
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#include "lwip_demo.h"
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#ifdef SAM_LWIP_EXAMPLE
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#define BUFSZ 1024
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static int started = 0;
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static int is_running = 0;
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static char url[256] = "www.baidu.com";
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static int port = 8080;
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static const char send_data[] = "This is TCP Client from RT-Thread."; /* The message be sent */ /* 发送用到的数据 */
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/**
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* @brief This function is for creating a tcp client on RT-Thread
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*/
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static void tcpclient(void *arg)
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{
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int ret;
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char *recv_data;
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int bytes_received;
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int sock = -1;
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struct hostent *host = RT_NULL;
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struct sockaddr_in server_addr;
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struct timeval timeout;
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fd_set readset;
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/* Get host address by parameter url(Domain name resolution if input domain) */
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/* 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） */
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host = gethostbyname(url);
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if (host == RT_NULL)
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{
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LOG_E("Get host by name failed!");
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return;
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}
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/* Allocate space for recv_data */
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/* 分配用于存放接收数据的缓冲 */
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recv_data = rt_malloc(BUFSZ);
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if (recv_data == RT_NULL)
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{
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LOG_E("No memory");
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return;
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}
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/* Create a socket and set it to SOCK_STREAM(TCP) */
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/* 创建一个socket，类型是SOCKET_STREAM，TCP类型 */
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if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1)
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{
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/* Failed on creating socket */
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/* 创建socket失败 */
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LOG_E("Create socket error");
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goto __exit;
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}
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/* Initialize server side address */
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/* 初始化预连接的服务端地址 */
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server_addr.sin_family = AF_INET;
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server_addr.sin_port = htons(port);
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server_addr.sin_addr = *((struct in_addr *)host->h_addr);
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rt_memset(&(server_addr.sin_zero), 0, sizeof(server_addr.sin_zero));
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/* Connect to server */
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/* 连接到服务端 */
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if (connect(sock, (struct sockaddr *)&server_addr, sizeof(struct sockaddr)) == -1)
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{
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/* Failed on connecting to server */
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/* 连接失败 */
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LOG_E("Connect fail!");
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goto __exit;
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}
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started = 1;
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is_running = 1;
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timeout.tv_sec = 3;
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timeout.tv_usec = 0;
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while (is_running)
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{
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FD_ZERO(&readset);
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FD_SET(sock, &readset);
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/* Wait for read */
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if (select(sock + 1, &readset, RT_NULL, RT_NULL, &timeout) == 0)
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continue;
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/* Receive the maximum size 1024 bytes from socket */
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/* 从sock连接中接收最大BUFSZ - 1字节数据 */
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bytes_received = recv(sock, recv_data, BUFSZ - 1, 0);
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if (bytes_received < 0)
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{
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/* Receive failed and close the connection */
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/* 接收失败，关闭这个连接 */
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LOG_E("Received error, close the socket.");
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goto __exit;
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}
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else if (bytes_received == 0)
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{
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/* Print warning message when recv function returns 0 */
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/* 打印recv函数返回值为0的警告信息 */
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LOG_W("Received warning, recv function returns 0.");
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continue;
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}
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else
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{
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/* Receive data successfully and append '\0' at the end of message */
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/* 有接收到数据，把末端清零 */
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recv_data[bytes_received] = '\0';
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if (rt_strcmp(recv_data, "q") == 0 || rt_strcmp(recv_data, "Q") == 0)
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{
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/* If the first letter is 'q' or 'Q', close the connection */
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/* 如果是首字母是q或Q，关闭这个连接 */
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LOG_I("Got a 'q' or 'Q', close the socket.");
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goto __exit;
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}
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else
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{
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/* Show the message in terminal */
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/* 在控制终端显示收到的数据 */
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LOG_D("Received data = %s", recv_data);
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}
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}
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/* Send message to connected socket */
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/* 发送数据到sock连接 */
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ret = send(sock, send_data, rt_strlen(send_data), 0);
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if (ret < 0)
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{
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/* Send failed, close the connection */
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/* 发送失败，关闭这个连接 */
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LOG_I("send error, close the socket.");
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goto __exit;
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}
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else if (ret == 0)
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{
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/* Print warning message when send function returns 0 */
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/* 打印send函数返回值为0的警告信息 */
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LOG_W("Send warning, send function returns 0.");
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}
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}
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__exit:
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if (recv_data)
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{
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rt_free(recv_data);
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recv_data = RT_NULL;
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}
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if (sock >= 0)
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{
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closesocket(sock);
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sock = -1;
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}
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started = 0;
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is_running = 0;
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return;
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}
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/**
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* @brief Call this function will run LWIP example code.
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*
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* @note .
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*
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* @param None.
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*
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* @return RT_OK or -RT_ERROR.
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*/
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rt_err_t lwip_demo_run(void)
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{
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rt_thread_t tid;
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tid = rt_thread_create("tcp_client",
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tcpclient, RT_NULL,
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2048, RT_THREAD_PRIORITY_MAX/3, 20);
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if (tid != RT_NULL)
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{
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rt_thread_startup(tid);
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}
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return RT_EOK;
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}
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#endif
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/*@}*/
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