socket基础

头文件

#include<stdio.h>

#include<stdlib.h>

#include<sys/types.h>

#include<sys/socket.h>

#include<netinet/in.h>

相关函数：

socket(); connect(); bind(); listen(); accept(); send(); recv(); close();

socket地址结构体struct sockaddr_in。

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服务器端：

#include<stdio.h>

#include<stdlib.h>

#include<sys/types.h>

#include<sys/socket.h>

#include<netinet/in.h>

int main()

{

    int net_socket;

    char server_msg[256]="this is msg from server\n";

    net_socket = socket(AF_INET,SOCK_STREAM,0);

    struct sockaddr_in server_addr;

    server_addr.sin_family = AF_INET;

    server_addr.sin_port = htons(9000);

    server_addr.sin_addr.s_addr = INADDR_ANY;

    bind(net_socket,(struct sockaddr *) &server_addr ,sizeof(server_addr));

    listen(net_socket,5);

    int client_socket;

    client_socket = accept(net_socket,NULL,NULL);

    send(client_socket,server_msg,sizeof(server_msg),0);

    close(net_socket);

    return 0;

}

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客户端：

#include<stdio.h>

#include<stdlib.h>

#include<sys/types.h>

#include<sys/socket.h>

#include<netinet/in.h>

int main()

{

    int net_socket;

    net_socket = socket(AF_INET,SOCK_STREAM,0);

    struct sockaddr_in server_addr;

    server_addr.sin_family = AF_INET;

    server_addr.sin_port = htons(9000);

    server_addr.sin_addr.s_addr = INADDR_ANY;

    int connection_status = connect(net_socket,(struct sockaddr *) &server_addr ,sizeof(server_addr));

    if (connection_status == -1)

    { 

        printf("there was an error making a connection to the remote socket\n");    }

    char server_response[256];

    recv(net_socket,&server_response,sizeof(server_response),0);

    printf("The server sent the data:%s\n",server_response);

    close(net_socket);

    return 0;

}