2013-01-08 21:05:02 +08:00
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#include <rtthread.h>
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#include <lwip/sockets.h> /* 使用BSD socket，需要包含sockets.h头文件 */
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#define BUFSZ 1024
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void udpserv(void* paramemter)
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{
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int sock;
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int bytes_read;
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char *recv_data;
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rt_uint32_t addr_len;
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struct sockaddr_in server_addr, client_addr;
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/* 分配接收用的数据缓冲 */
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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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/* 分配内存失败，返回 */
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rt_kprintf("No memory\n");
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return;
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}
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/* 创建一个socket，类型是SOCK_DGRAM，UDP类型 */
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if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
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{
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rt_kprintf("Socket error\n");
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/* 释放接收用的数据缓冲 */
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rt_free(recv_data);
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return;
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}
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/* 初始化服务端地址 */
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server_addr.sin_family = AF_INET;
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server_addr.sin_port = htons(5000);
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server_addr.sin_addr.s_addr = INADDR_ANY;
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rt_memset(&(server_addr.sin_zero),0, sizeof(server_addr.sin_zero));
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/* 绑定socket到服务端地址 */
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if (bind(sock,(struct sockaddr *)&server_addr,
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sizeof(struct sockaddr)) == -1)
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{
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/* 绑定地址失败 */
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rt_kprintf("Bind error\n");
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/* 释放接收用的数据缓冲 */
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rt_free(recv_data);
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return;
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}
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addr_len = sizeof(struct sockaddr);
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rt_kprintf("UDPServer Waiting for client on port 5000...\n");
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while (1)
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{
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/* 从sock中收取最大BUFSZ - 1字节数据 */
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bytes_read = recvfrom(sock, recv_data, BUFSZ - 1, 0,
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(struct sockaddr *)&client_addr, &addr_len);
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/* UDP不同于TCP，它基本不会出现收取的数据失败的情况，除非设置了超时等待 */
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recv_data[bytes_read] = '\0'; /* 把末端清零 */
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/* 输出接收的数据 */
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rt_kprintf("\n(%s , %d) said : ",inet_ntoa(client_addr.sin_addr),
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ntohs(client_addr.sin_port));
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rt_kprintf("%s", recv_data);
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/* 如果接收数据是exit，退出 */
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if (strcmp(recv_data, "exit") == 0)
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{
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lwip_close(sock);
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/* 释放接收用的数据缓冲 */
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rt_free(recv_data);
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break;
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}
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}
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return;
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}
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#ifdef RT_USING_FINSH
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#include <finsh.h>
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/* 输出udpserv函数到finsh shell中 */
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FINSH_FUNCTION_EXPORT(udpserv, startup udp server);
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#endif
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