• 2019-2020-1《信息安全系统设计》20175311 20175324 20175330 实验三实时系统

    2019-2020-1《信息安全系统设计》20175311 20175324 20175330 实验三实时系统

    任务一
    • 学习使用Linux命令wc(1)
    • 基于Linux Socket程序设计实现wc（1）服务器(端口号是你学号的后6位)和客户端
    • 客户端传一个文本文件给服务器
    • 服务器返加文本文件中的单词数
    • 使用多线程实现wc服务器并使用同步互斥机制保证计数正确

    实验操作

    任务一 ：

    • 实现wc功能实现
    • 客户端给服务器传文件功能
    • 在客户端调用wc函数统计传过来的文件的单词个数
      wc命令参数：-
      用wc命令做到只打印统计数字不打印文件名：cat test.txt |wc -l
    1. -c 统计字节数。
    2. -l 统计行数。
    3. -m 统计字符数。这个标志不能与 -c 标志一起使用。
    4. -w 统计字数。一个字被定义为由空白、跳格或换行字符分隔的字符串。
    5. -L 打印最长行的长度。
    6. -help 显示帮助信息
    7. --version 显示版本信息

    服务器代码：

    #include <netinet/in.h>    // for sockaddr_in
#include <sys/types.h>    // for socket
#include <sys/socket.h>    // for socket
#include <stdio.h>        // for printf
#include <stdlib.h>        // for exit
#include <string.h>        // for bzero
#define HELLO_WORLD_SERVER_PORT    6666 
#define LENGTH_OF_LISTEN_QUEUE 20
#define BUFFER_SIZE 1024
#define FILE_NAME_MAX_SIZE 512
int main(int argc, char **argv)
{
    //设置一个socket地址结构server_addr,代表服务器internet地址, 端口
    struct sockaddr_in server_addr;
    bzero(&server_addr,sizeof(server_addr)); //把一段内存区的内容全部设置为0
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = htons(155202);
    server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);

    //创建用于internet的流协议(TCP)socket,用server_socket代表服务器socket
    int server_socket = socket(PF_INET,SOCK_STREAM,0);
    if( server_socket < 0)
    {
        printf("Create Socket Failed!");
        exit(1);
    }
    
    //把socket和socket地址结构联系起来
    if( bind(server_socket,(struct sockaddr*)&server_addr,sizeof(server_addr)))
    {
        printf("Server Bind Port : %d Failed!", HELLO_WORLD_SERVER_PORT); 
        exit(1);
    }
    
    //server_socket用于监听
    if ( listen(server_socket, LENGTH_OF_LISTEN_QUEUE) )
    {
        printf("Server Listen Failed!"); 
        exit(1);
    }
    while (1) //服务器端要一直运行
    {
        //定义客户端的socket地址结构client_addr
        struct sockaddr_in client_addr;
        socklen_t length = sizeof(client_addr);

        //接受一个到server_socket代表的socket的一个连接
        //如果没有连接请求,就等待到有连接请求--这是accept函数的特性
        //accept函数返回一个新的socket,这个socket(new_server_socket)用于同连接到的客户的通信
        //new_server_socket代表了服务器和客户端之间的一个通信通道
        //accept函数把连接到的客户端信息填写到客户端的socket地址结构client_addr中
        int new_server_socket = accept(server_socket,(struct sockaddr*)&client_addr,&length);
        if ( new_server_socket < 0)
        {
            printf("Server Accept Failed!
");
            break;
        }
        
        char buffer[BUFFER_SIZE];
        bzero(buffer, BUFFER_SIZE);
        length = recv(new_server_socket,buffer,BUFFER_SIZE,0);
        if (length < 0)
        {
            printf("Server Recieve Data Failed!
");
            break;
        }
        char file_name[FILE_NAME_MAX_SIZE+1];
        bzero(file_name, FILE_NAME_MAX_SIZE+1);
        strncpy(file_name, buffer, strlen(buffer)>FILE_NAME_MAX_SIZE?FILE_NAME_MAX_SIZE:strlen(buffer));
//        int fp = open(file_name, O_RDONLY);//        if( fp < 0 )
        FILE * fp = fopen(file_name,"r");
        if(NULL == fp )
        {
            printf("File:	%s Not Found
", file_name);
        }
        else
        {
            bzero(buffer, BUFFER_SIZE);
            int file_block_length = 0;
//            while( (file_block_length = read(fp,buffer,BUFFER_SIZE))>0)
            while( (file_block_length = fread(buffer,sizeof(char),BUFFER_SIZE,fp))>0)
            {
                printf("file_block_length = %d
",file_block_length);
                //发送buffer中的字符串到new_server_socket,实际是给客户端
                if(send(new_server_socket,buffer,file_block_length,0)<0)
                {
                    printf("Send File:	%s Failed
", file_name);
                    break;
                }
                bzero(buffer, BUFFER_SIZE);
            }
//            close(fp);
            fclose(fp);
            printf("File:	%s Transfer Finished
",file_name);
        }
        //关闭与客户端的连接
        close(new_server_socket);
    }
    //关闭监听用的socket
    close(server_socket);
    return 0;
}

    客户端代码：

    #include <netinet/in.h>    // for sockaddr_in
#include <sys/types.h>    // for socket
#include <sys/socket.h>    // for socket
#include <stdio.h>        // for printf
#include <stdlib.h>        // for exit
#include <string.h>        // for bzero
#define HELLO_WORLD_SERVER_PORT    6666 #define BUFFER_SIZE 1024
#define FILE_NAME_MAX_SIZE 512
#define INADDR_ANY 175311     
int main(int argc, char **argv){
    if (argc != 2)
    {
        printf("Usage: ./%s ServerIPAddress
",argv[0]);
        exit(1);
    }

    //设置一个socket地址结构client_addr,代表客户机internet地址, 端口
    struct sockaddr_in client_addr;
    bzero(&client_addr,sizeof(client_addr)); //把一段内存区的内容全部设置为0
    client_addr.sin_family = AF_INET;    //internet协议族
    client_addr.sin_addr.s_addr = htons(INADDR_ANY);//INADDR_ANY表示自动获取本机地址
    client_addr.sin_port = htons(0);    //0表示让系统自动分配一个空闲端口
    //创建用于internet的流协议(TCP)socket,用client_socket代表客户机socket
    int client_socket = socket(AF_INET,SOCK_STREAM,0);
    if( client_socket < 0)
    {
        printf("Create Socket Failed!
");
        exit(1);
    }
    //把客户机的socket和客户机的socket地址结构联系起来
    if( bind(client_socket,(struct sockaddr*)&client_addr,sizeof(client_addr)))
    {
        printf("Client Bind Port Failed!
"); 
        exit(1);
    }

    //设置一个socket地址结构server_addr,代表服务器的internet地址, 端口
    struct sockaddr_in server_addr;
    bzero(&server_addr,sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    if(inet_aton(argv[1],&server_addr.sin_addr) == 0) //服务器的IP地址来自程序的参数
    {
        printf("Server IP Address Error!
");
        exit(1);
    }
    server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);
    socklen_t server_addr_length = sizeof(server_addr);
    //向服务器发起连接,连接成功后client_socket代表了客户机和服务器的一个socket连接
    if(connect(client_socket,(struct sockaddr*)&server_addr, server_addr_length) < 0)
    {
        printf("Can Not Connect To %s!
",argv[1]);
        exit(1);
    }

    char file_name[FILE_NAME_MAX_SIZE+1];
    bzero(file_name, FILE_NAME_MAX_SIZE+1);
    printf("Please Input File Name On Server:	");
    scanf("%s", file_name);
    
    char buffer[BUFFER_SIZE];
    bzero(buffer,BUFFER_SIZE);
    strncpy(buffer, file_name, strlen(file_name)>BUFFER_SIZE?BUFFER_SIZE:strlen(file_name));
    //向服务器发送buffer中的数据
    send(client_socket,buffer,BUFFER_SIZE,0);

//    int fp = open(file_name, O_WRONLY|O_CREAT);//    if( fp < 0 )
    FILE * fp = fopen(file_name,"w");
    if(NULL == fp )
    {
        printf("File:	%s Can Not Open To Write
", file_name);
        exit(1);
    }
    
    //从服务器接收数据到buffer中
    bzero(buffer,BUFFER_SIZE);
    int length = 0;
    while( length = recv(client_socket,buffer,BUFFER_SIZE,0))
    {
        if(length < 0)
        {
            printf("Recieve Data From Server %s Failed!
", argv[1]);
            break;
        }
//        int write_length = write(fp, buffer,length);
        int write_length = fwrite(buffer,sizeof(char),length,fp);
        if (write_length<length)
        {
            printf("File:	%s Write Failed
", file_name);
            break;
        }
        bzero(buffer,BUFFER_SIZE);    
    }
    printf("Recieve File:	 %s From Server[%s] Finished
",file_name, argv[1]);
    
    fclose(fp);
    //关闭socket
    close(client_socket);
    return 0;
}



    实验三-并发程序-2

    • 使用多线程实现wc服务器并使用同步互斥机制保证计数正确
    • 对比单线程版本的性能，并分析原因
    • 多线程实现wc服务器时，会出现多个客户端同时像服务器传送文件的情况，所以仅仅在服务器端创建一个recvfile.txt用于接收文件是远远不够的，需要根据发送的不同文件名创建新的接收文件。
    实验代码

    服务器：

    #include"csapp.h"
#include<stdio.h>
#include<stdlib.h>
static int byte_cnt;
static sem_t mutex;
#define NTHREADS  4
#define SBUFSIZE  16
typedef struct {
    int *buf;          /* Buffer array     
    int n;             /* Maximum number of slots 
    int front;         /* buf[(front+1)%n] is first item 
    int rear;          /* buf[rear%n] is last item 
    sem_t mutex;       /* Protects accesses to buf 
    sem_t slots;       /* Counts available slots 
    sem_t items;       /* Counts available items 
} sbuf_t;
void echo_cnt(int connfd);
void *thread(void *vargp);
int wc(char *name){
 char ch;
 FILE *fp;
 long count=0;
 char s[21];
  
  
 if ((fp=fopen(name,"r+"))==NULL)
 {
  fprintf(stderr,"不能打开文件
");
  exit(EXIT_FAILURE);
 }
while(fscanf(fp,"%s",s)!=EOF)
        count++;
  
 fclose(fp);
 printf("File %s has %ld characters
",name,count);
 return 0;
}
 
sbuf_t sbuf; /* shared buffer of connected descriptors */
 
int main(int argc, char **argv){
    int i, listenfd, connfd, port, clientlen=sizeof(struct sockaddr_in);
    struct sockaddr_in clientaddr;
    pthread_t tid;
 
    if (argc != 2) {
    fprintf(stderr, "usage: %s <port>
", argv[0]);
    exit(0);
    }
    port = atoi(argv[1]);
    sbuf_init(&sbuf, SBUFSIZE);
    listenfd = Open_listenfd(port);
 
    for (i = 0; i < NTHREADS; i++)  /* Create worker threads */
    Pthread_create(&tid, NULL, thread, NULL);
 
    while (1) {
    connfd = Accept(listenfd, (SA *) &clientaddr, &clientlen);
    sbuf_insert(&sbuf, connfd); /* Insert connfd in buffer */
    }
}
 
static void init_echo_cnt(void){
    Sem_init(&mutex, 0, 1);
    byte_cnt = 0;
}
 
void echo_cnt(int connfd){
    int n,x;
    long int count;
    char buf[MAXLINE];
    char name[MAXLINE]
    rio_t rio;
    static pthread_once_t once = PTHREAD_ONCE_INIT;
 
    Pthread_once(&once, init_echo_cnt);
    Rio_readinitb(&rio, connfd);
    while((n = Rio_readlineb(&rio, buf, MAXLINE)) != 0) {
    P(&mutex);
    byte_cnt += n;
        /*x = sizeof(buf);
        buf[x] = 0;
        count = wc(buf);*/
    printf("thread %d received %d (%d total) bytes on fd %d
",
           (int) pthread_self(), n, byte_cnt, connfd);
        //name = buf;
    V(&mutex);
        //sprint(buf,"%s:%ld characters".count);
 
    Rio_writen(connfd, buf, n);
    }
}
 
void sbuf_init(sbuf_t *sp, int n){
    sp->buf = Calloc(n, sizeof(int));
    sp->n = n;                       /* Buffer holds max of n items */
    sp->front = sp->rear = 0;        /* Empty buffer iff front == rear */
    Sem_init(&sp->mutex, 0, 1);      /* Binary semaphore for locking */
    Sem_init(&sp->slots, 0, n);      /* Initially, buf has n empty slots */
    Sem_init(&sp->items, 0, 0);      /* Initially, buf has zero data items */
}
/* $end sbuf_init */
 
/* Clean up buffer sp *//* $begin sbuf_deinit */void sbuf_deinit(sbuf_t *sp){
    Free(sp->buf);
}
/* $end sbuf_deinit */
 
/* Insert item onto the rear of shared buffer sp *//* $begin sbuf_insert */void sbuf_insert(sbuf_t *sp, int item){
    P(&sp->slots);                          /* Wait for available slot */
    P(&sp->mutex);                          /* Lock the buffer */
    sp->buf[(++sp->rear)%(sp->n)] = item;   /* Insert the item */
    V(&sp->mutex);                          /* Unlock the buffer */
    V(&sp->items);                          /* Announce available item */
}
/* $end sbuf_insert */
 
/* Remove and return the first item from buffer sp *//* $begin sbuf_remove */int sbuf_remove(sbuf_t *sp){
    int item;
    P(&sp->items);                          /* Wait for available item */
    P(&sp->mutex);                          /* Lock the buffer */
    item = sp->buf[(++sp->front)%(sp->n)];  /* Remove the item */
    V(&sp->mutex);                          /* Unlock the buffer */
    V(&sp->slots);                          /* Announce available slot */
    return item;
}
 
void *thread(void *vargp){ 
    Pthread_detach(pthread_self());
    while (1) {
    int connfd = sbuf_remove(&sbuf); /* Remove connfd from buffer */
    echo_cnt(connfd);                /* Service client */
    Close(connfd);
    }
}

    客户端：

    #include"csapp.h"
#include<stdio.h>
#include<stdlib.h>
int wc(char *name){
 char ch;
 FILE *fp;
 long count=0;
 char s[21];
  
  
 if ((fp=fopen("test1.txt","r+"))==NULL)
 {
  fprintf(stderr,"不能打开文件%s
",name);
  exit(EXIT_FAILURE);
 }
while(fscanf(fp,"%s",s)!=EOF)
        count++;
  
 fclose(fp);
 printf("File %s has %ld characters
",name,count);
 return 0;
}
int main(int argc, char **argv){
    int clientfd, port,n,count;
    char *host, buf[MAXLINE];
    rio_t rio;
 
    if (argc != 3) {
    fprintf(stderr, "usage: %s <host> <port>
", argv[0]);
    exit(0);
    }
    host = argv[1];
    port = atoi(argv[2]);
 
    clientfd = Open_clientfd(host, port);
    Rio_readinitb(&rio, clientfd);
 
    while (Fgets(buf, MAXLINE, stdin) != NULL) {
        if((num=recv(sockfd,buf,MAXDATASIZE,0))==-1)
    {
        printf("recv() error
");
        exit(1);
    }
    buf[num-1]='';
     
         
    Rio_writen(clientfd, buf, strlen(buf));
    Rio_readlineb(&rio, buf, MAXLINE);
    Fputs(buf, stdout);
    }
    Close(clientfd);
    exit(0);
}
/* $end echoclientmain *//* $begin echoclientmain *///#include "csapp.h"/*int main(int argc, char **argv)
{
    int clientfd, port;
    char *host, buf[MAXLINE];
    char *name;
    rio_t rio;
    FILE *fp;
    if (argc != 4) {
    fprintf(stderr, "usage: %s <host> <port> <filename>
", argv[0]);
    exit(0);
    }
    host = argv[1];
    port = atoi(argv[2]);
    name = argv[3];
    clientfd = Open_clientfd(host, port);
    Rio_readinitb(&rio, clientfd);
 
    fp=fopen(name,"r+");
    while (Fgets(buf, MAXLINE,fp) != NULL) {
    Rio_writen(clientfd, buf, strlen(buf));
    Rio_readlineb(&rio, buf, MAXLINE);
    Fputs(buf, stdout);
    }
    Close(clientfd);
    exit(0);
}






  • 相关阅读:
    Redis-配置文件与持久化
    Redis-搭建简单集群
    python实现简单的统计
    Redis-三种数据结构与事务
    String 类的理解
    针对Java面试来学习JAVA内容，让你事半功倍
    jdbc实现原理
    一朋友的Java基础面试题及答案（TCP/IP部分）
    Java Docker容器化技术详解
    Java新手开源项目集合
  • 原文地址：https://www.cnblogs.com/hujidong42/p/11922163.html
Copyright © 2020-2023  润新知