1 TCP本地通信 简单程序实现 （一）

服务端：

#include<sys/types.h>
#include<sys/socket.h>
#include<stdio.h>
#include<sys/un.h>
#include<unistd.h>
#include<stdlib.h>

int main(int argc,char *argv[])
{
    int server_sockfd,client_sockfd;
    int server_len,client_len;
    struct sockaddr_un server_address;
    struct sockaddr_un client_address;

    int i,byte;
    char ch_send,ch_recv;
    unlink("server_socket");

        server_sockfd=socket(AF_UNIX,SOCK_STREAM,0); // AF_INET IPV4域  AF_UNIX  UNIX 域 SOCK_STREAM 可靠/双向
                                                     //面向链接字节流，0 ：系统自动选择 协议

    server_address.sun_family=AF_UNIX;
    strcpy(server_address.sun_path,"server_socket");//如果是 AF_UNIX域，需要与一个文件进行绑定 //临时文件                           //会在当前目录下，生成临时文件  server_socket
    server_len=sizeof(server_address);
    //绑定 ip 地址和端口
    bind(server_sockfd,(struct sockaddr *)&server_address,server_len);
    //监听网络，
    listen(server_sockfd,5);
    printf("is watiing for client connect...\n");

    //客户端发起连接
    client_len=sizeof(client_address);
    client_sockfd=accept(server_sockfd,(struct sockaddr *)&client_address,(socklen_t *)&client_len);    //当没有 客户端请求，accept 会阻塞
    while(1)
    {
        if((byte=read(client_sockfd,&ch_recv,1))==-1)
        {
            perror("read");
            exit(EXIT_FAILURE);
        }
        printf("receive a character from client is : %c \n",ch_recv);
        //sleep(1);

    //    printf("input a charater to send :\n");
        ch_send=getchar();
        if((byte=write(client_sockfd,&ch_send,1))==-1)
        {
            perror("write");
            exit(EXIT_FAILURE);
        }
        //printf("");

      }
    close(client_sockfd);
    unlink("server socket");
    return 0;

}/**/

客户端：

#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <sys/un.h>
#include <stdlib.h>
#include <unistd.h>

int main(int argc,char *argv[])
{
    int sockfd;
    int len;
    struct sockaddr_un address;
    int i,byte;
    char ch_recv,ch_send;

    sockfd=socket(PF_UNIX,SOCK_STREAM,0);

    address.sun_family=AF_UNIX;
    strcpy(address.sun_path,"server_socket");
    len=sizeof(address);
    connect(sockfd,(struct sockaddr*)&address,len);

    while(1)
    {
    //    printf("intpur a charater to send:\n");
        ch_send=getchar();
        write(sockfd,&ch_send,1);
        byte=read(sockfd,&ch_recv,1);
        printf("receiver charater from server is %c:\n\n",ch_recv);
    }

    close(sockfd);
    return 0;
}