Linux UDP服务端和客户端程序

1. 源码

UDP服务端：

/**
 * @brief   UDP服务端
 * @author  Mculover666
 * @date    2020/04/15
*/
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <string.h>

int main(int argc, char* argv[])
{

    int server_sock_fd;
    struct sockaddr_in server_addr, client_addr;
    char recv_buf[100];
    int nbytes = 0;
    socklen_t len = 0;

    /* 创建Server Socket */
    server_sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
    if (server_sock_fd < 0)
    {
        printf("服务端Socket创建失败");
        return -1;
    }
    printf("服务端Socket创建成功\n");

    /* 绑定ip和端口 */
    bzero(&server_addr, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    server_addr.sin_port = htons(atoi(argv[1]));//指定端口号
    bind(server_sock_fd, (struct sockaddr *) &server_addr, sizeof(server_addr));

    printf("服务端Socket绑定成功\n");
    
    while(1)
    {
        /* 接收UDP客户端的数据 */
        printf("等待接收客户端数据：\n");
        len = sizeof(client_addr);
        nbytes = recvfrom(server_sock_fd, recv_buf, 100, 0, (struct sockaddr *)&client_addr, &len);
        printf("ok\n");
        recv_buf[nbytes] = '\0';
        printf("recv %d bytes:%s.\n", nbytes, recv_buf);

        //接收用户输入，发送给客户端
        printf("请输入要发送给客户端的数据:");
        fgets(recv_buf, 100, stdin);
        sendto(server_sock_fd,recv_buf,strlen(recv_buf),0,(struct sockaddr *)&client_addr,len);
    }

    return 0;
}

UDP客户端：

/**
 * @brief   UDP客户端程序
 * @author  Mculover666
 * @date    2020/04/15
*/
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <string.h>

int main(int argc, char* argv[])
{
    int sock_fd;
    struct sockaddr_in server_addr;
    char recv_buf[100];
    int nbytes = 0;
    socklen_t len = 0;

    /* 创建Socket */
    sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
    if (sock_fd < 0)
    {
        printf("客户端Socket创建失败");
        return -1;
    }

    /* 绑定ip和端口 */
    bzero(&server_addr, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = inet_addr(argv[1]);
    server_addr.sin_port = htons(atoi(argv[2]));//指定端口号
    while(1)
    {
	    len = sizeof(server_addr);
        //接收用户输入，发送给服务端
        printf("请输入要发送给服务端的数据:");
	    fgets(recv_buf, 100, stdin);
        sendto(sock_fd,recv_buf,100,0,(struct sockaddr *)(&server_addr),len);
        
        /* 接收UDP客户端的数据 */
        len = sizeof(server_addr);
        nbytes = recvfrom(sock_fd, recv_buf, 100, 0, (struct sockaddr *)&server_addr, &len);
        recv_buf[nbytes] = '\0';
        printf("recv %d bytes:%s.\n", nbytes, recv_buf);
    
    }

    return 0;
}

2. 在本机运行结果

编译：

gcc server.c -o srever_wangshiwei.o
gcc client.c -o client_wangshiwei.o

运行：

3. 在开发板与PC之间运行结果

编译：

gcc server.c -o srever_wangshiwei.o
arm-linux-gnueabi-gcc client.c -o clientARM_wangshiwei.o