嵌入式linux下socket网络通信编程实例一

嵌入式linux下socket网络通信编程

（本人自己写的linux下的socket 测试通过了，也在实际的项目中套用过）

 

client：

/*  Make the necessary includes and set up the variables.  */

#include <sys/types.h>

#include <sys/socket.h>

#include <stdio.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <unistd.h>

#include <stdlib.h>

int main()

{

    int sockfd;

    int len;

    struct sockaddr_in address;

    int result;

    char ch = 'A';

/*  Create a socket for the client.  */

    sockfd = socket(AF_INET, SOCK_STREAM, 0);

/*  Name the socket, as agreed with the server.  */

    address.sin_family = AF_INET;

    address.sin_addr.s_addr = inet_addr("127.0.0.1");

    address.sin_port = htons(9734);

    len = sizeof(address);

/*  Now connect our socket to the server's socket.  */

    result = connect(sockfd, (struct sockaddr *)&address, len);

    if(result == -1) {

        perror("oops: client3");

        exit(1);

    }

/*  We can now read/write via sockfd.  */

    write(sockfd, &ch, 1);

    read(sockfd, &ch, 1);

    printf("char from server = %c\n", ch);

    close(sockfd);

    exit(0);

}

 

***************************************

server

/*  Make the necessary includes and set up the variables.  */

#include <sys/types.h>

#include <sys/socket.h>

#include <stdio.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <unistd.h>

#include <stdlib.h>

int main()

{

    int server_sockfd, client_sockfd;

    int server_len, client_len;

    struct sockaddr_in server_address;

    struct sockaddr_in client_address;

/*  Remove any old socket and create an unnamed socket for the server.  */

    server_sockfd = socket(AF_INET, SOCK_STREAM, 0);

/*  Name the socket.  */

    server_address.sin_family = AF_INET;

    server_address.sin_addr.s_addr = htonl(INADDR_ANY);

    server_address.sin_port = htons(9734);

    server_len = sizeof(server_address);

    bind(server_sockfd, (struct sockaddr *)&server_address, server_len);

/*  Create a connection queue and wait for clients.  */

    listen(server_sockfd, 5);

    while(1) {

        char ch;

        printf("server waiting\n");

/*  Accept a connection.  */

        client_len = sizeof(client_address);

        client_sockfd = accept(server_sockfd,

            (struct sockaddr *)&client_address, &client_len);

/*  We can now read/write to client on client_sockfd.  */

        read(client_sockfd, &ch, 1);

        ch++;

        write(client_sockfd, &ch, 1);

        close(client_sockfd);

    }

}