2018-2019-1 20165301 20165304 20165314 实验三 实时系统

2018-2019-1 20165301 20165304 20165314 实验三 实时系统

• 实验三-并发程序-1
  • 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

查看man手册对wc的解释：
【man 1 wc】

• 基于LinuxSocket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

服务器代码

#include<netinet/in.h>  // sockaddr_in  
#include<sys/types.h>   // socket  
#include<sys/socket.h>  // socket  
#include<stdio.h>       // printf  
#include<stdlib.h>      // exit  
#include<string.h>      // bzero  

#define SERVER_PORT 165301
#define LENGTH_OF_LISTEN_QUEUE 20  
#define BUFFER_SIZE 1024
#define FILE_NAME_MAX_SIZE 512  
#define BEGIN 1; 

int main(void)  
{  

struct sockaddr_in server_addr;  
bzero(&server_addr, sizeof(server_addr));  
server_addr.sin_family = AF_INET;  
server_addr.sin_addr.s_addr = htons(INADDR_ANY);  
server_addr.sin_port = htons(SERVER_PORT);  

int server_socket_fd = socket(PF_INET, SOCK_STREAM, 0);  
if(server_socket_fd < 0)  
{  
    perror("Create Socket Failed:");  
    exit(1);  
}  
int opt = 1;  
setsockopt(server_socket_fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));  

if(-1 == (bind(server_socket_fd, (struct sockaddr*)&server_addr, sizeof(server_addr))))  
{  
    perror("Server Bind Failed:");  
    exit(1);  
}  
    
if(-1 == (listen(server_socket_fd, LENGTH_OF_LISTEN_QUEUE)))  
{  
    perror("Server Listen Failed:");  
    exit(1);  
}  

while(1)  
{  
    struct sockaddr_in client_addr;  
    socklen_t client_addr_length = sizeof(client_addr);  

    int new_server_socket_fd = accept(server_socket_fd, (struct sockaddr*)&client_addr, &client_addr_length);  
    if(new_server_socket_fd < 0)  
    {  
        perror("Server Accept Failed:");  
        break;  
    }  


    char buffer[BUFFER_SIZE];  
    bzero(buffer, BUFFER_SIZE);  
    if(recv(new_server_socket_fd, buffer, BUFFER_SIZE, 0) < 0)  
    {  
        perror("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));  
    printf("%s
", file_name);  


    FILE *fp = fopen(file_name, "w");  
    if(NULL == fp)  
    {  
        printf("File:	%s Can Not Open To Write
", file_name);  
        exit(1);  
    }  


    bzero(buffer, BUFFER_SIZE);  
    int length = 0;  
    while((length = recv(new_server_socket_fd, buffer, BUFFER_SIZE, 0)) > 0)  
    {  
    if(strcmp(buffer,"OK")==0) break;
        if(fwrite(buffer, sizeof(char), length, fp) < length)  
        {  
            printf("File:	%s Write Failed
", file_name);  
            break;  
        }  
        bzero(buffer, BUFFER_SIZE);  
    }  

    printf("Receive File:	%s From Client IP Successful!
", file_name);  
    fclose(fp);

int words=0;
char s[100];
FILE *fp2;
if((fp2=fopen(file_name,"r"))==NULL){
    printf("ERROR!
");
    exit(0);
}
while(fscanf(fp2,"%s",s)!=EOF)
    words++;
fclose(fp2);
printf("%d words.
",words);

char sendbuf[50];
sprintf(sendbuf,"%d",words);

send(new_server_socket_fd,sendbuf,50,0);

    close(new_server_socket_fd);  
}  

close(server_socket_fd);  
return 0;  
}

客户端代码

#include<netinet/in.h>   // sockaddr_in  
#include<sys/types.h>    // socket  
#include<sys/socket.h>   // socket  
#include<stdio.h>        // printf  
#include<stdlib.h>       // exit  
#include<string.h>       // bzero  

#define SERVER_PORT 165301 
#define BUFFER_SIZE 1024  
#define FILE_NAME_MAX_SIZE 512  
#define BEGIN 1;

int main()  
{  

struct sockaddr_in client_addr;  
bzero(&client_addr, sizeof(client_addr));  
client_addr.sin_family = AF_INET;  
client_addr.sin_addr.s_addr = htons(INADDR_ANY);  
client_addr.sin_port = htons(0);  

int client_socket_fd = socket(AF_INET, SOCK_STREAM, 0);  
if(client_socket_fd < 0)  
{  
    perror("Create Socket Failed:");  
    exit(1);  
}  

if(-1 == (bind(client_socket_fd, (struct sockaddr*)&client_addr, sizeof(client_addr))))  
{  
    perror("Client Bind Failed:");  
    exit(1);  
}  

struct sockaddr_in server_addr;  
bzero(&server_addr, sizeof(server_addr));  
server_addr.sin_family = AF_INET;  
if(inet_pton(AF_INET, "127.0.0.1", &server_addr.sin_addr) == 0)  
{  
    perror("Server IP Address Error:");  
    exit(1);  
}  
server_addr.sin_port = htons(SERVER_PORT);  
socklen_t server_addr_length = sizeof(server_addr);  

if(connect(client_socket_fd, (struct sockaddr*)&server_addr, server_addr_length) < 0)  
{  
    perror("Can Not Connect To Server IP:");  
    exit(0);  
}  

char file_name[FILE_NAME_MAX_SIZE+1];  
bzero(file_name, FILE_NAME_MAX_SIZE+1);  

printf("Please Input File Name On Client:	");
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));  
  
if(send(client_socket_fd, buffer, BUFFER_SIZE, 0) < 0)  
{  
    perror("Send File Name Failed:");  
    exit(1);  
}  

    FILE *fp = fopen(file_name, "r");  
    if(NULL == fp)  
    {  
        printf("File:%s Not Found
", file_name);  
    }  
    else  
    {  
        bzero(buffer, BUFFER_SIZE);  
        int length = 0;  
        while((length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0)  
        {  
            if(send(client_socket_fd, buffer, length, 0) < 0)  
            {  
                printf("Send File:%s Failed./n", file_name);  
                break;  
            }  
            bzero(buffer, BUFFER_SIZE);  
        }  

        fclose(fp);  
        printf("File:%s Transfer Successful!
", file_name);  
    }  

char s[50];
scanf("%s",s);
send(client_socket_fd,"OK",50,0);

char recvdata[sizeof(int)+1];
recv(client_socket_fd,recvdata,sizeof(int),0);
recvdata[sizeof(int)]='';
int words=atoi(recvdata);
close(client_socket_fd);  
return 0;  
}

实验截图

• 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
  • 上方提交代码
  • 下方提交测试
  • 对比单线程版本的性能，并分析原因

服务器代码

#include<stdlib.h>
#include<pthread.h>
#include<sys/socket.h>
#include<sys/types.h>       //pthread_t , pthread_attr_t and so on.
#include<stdio.h>
#include<netinet/in.h>      //structure sockaddr_in
#include<arpa/inet.h>       //Func : htonl; htons; ntohl; ntohs
#include<assert.h>          //Func :assert
#include<string.h>          //Func :memset bzero
#include<unistd.h>          //Func :close,write,read
#define SOCK_PORT 9988
#define BUFFER_LENGTH 1024
#define MAX_CONN_LIMIT 512     //MAX connection limit
static void Data_handle(void * sock_fd);   //Only can be seen in the file
int CountWordsOfEuropeanTxtFile(char *szFileName);
int CountWordsInOneLine(const char *szLine);
int main()
{
    int sockfd_server;
    int sockfd;
    int fd_temp;
    struct sockaddr_in s_addr_in;
    struct sockaddr_in s_addr_client;
    int client_length;
    sockfd_server = socket(AF_INET,SOCK_STREAM,0);  //ipv4,TCP
    assert(sockfd_server != -1);
    //before bind(), set the attr of structure sockaddr.
    memset(&s_addr_in,0,sizeof(s_addr_in));
    s_addr_in.sin_family = AF_INET;
    s_addr_in.sin_addr.s_addr = htonl(INADDR_ANY);  //trans addr from uint32_t host byte order to network byte order.
    s_addr_in.sin_port = htons(SOCK_PORT);          //trans port from uint16_t host byte order to network byte order.
    fd_temp = bind(sockfd_server,(const struct sockaddr *)(&s_addr_in),sizeof(s_addr_in));
    if(fd_temp == -1)
    {
        fprintf(stderr,"bind error!
");
        exit(1);
    }
    fd_temp = listen(sockfd_server,MAX_CONN_LIMIT);
    if(fd_temp == -1)
    {
        fprintf(stderr,"listen error!
");
        exit(1);
    }
    while(1)
    {
        printf("waiting for new connection...
");
        pthread_t thread_id;
        client_length = sizeof(s_addr_client);
        //Block here. Until server accpets a new connection.
        sockfd = accept(sockfd_server,(struct sockaddr * restrict)(&s_addr_client),(socklen_t *)(&client_length));
        if(sockfd == -1)
        {
            fprintf(stderr,"Accept error!
");
            continue;                               //ignore current socket ,continue while loop.
        }
        printf("A new connection occurs!
");
        if(pthread_create(&thread_id,NULL,(void *)(&Data_handle),(void *)(&sockfd)) == -1)
        {
            fprintf(stderr,"pthread_create error!
");
            break;                                  //break while loop
        }
    }
    //Clear
    int ret = shutdown(sockfd_server,SHUT_WR); //shut down the all or part of a full-duplex connection.
    assert(ret != -1);
    printf("Server shuts down
");
    return 0;
}
static void Data_handle(void * sock_fd)
{
    int fd = *((int *)sock_fd);
    int i_recvBytes;
    char data_recv[BUFFER_LENGTH];
    const char * data_send = "Server has received your request!
";
    while(1)
    {
        printf("waiting for file_name...
");
        //Reset data.
        memset(data_recv,0,BUFFER_LENGTH);
        i_recvBytes = read(fd,data_recv,BUFFER_LENGTH);
        if(i_recvBytes == 0)
        {
            printf("Maybe the client has closed
");
            break;
        }
        if(i_recvBytes == -1)
        {
            fprintf(stderr,"read error!
");
            break;
        }
        if(strcmp(data_recv,"quit")==0)
        {
            printf("Quit command!
");
            break;                           //Break the while loop.
        }
        printf("read from client : %s
",data_recv);
        
    char buffer[BUFFER_LENGTH];
    int count=0;
    bzero(buffer, BUFFER_LENGTH);
    count = CountWordsOfEuropeanTxtFile(data_recv);
    sprintf(buffer,"%d", count);
        send(fd, buffer, sizeof(buffer), 0);
        if(write(fd,data_send,strlen(data_send)) == -1)
        {
            break;
        }
    }
    //Clear
    printf("terminating current client_connection...
");
    close(fd);            //close a file descriptor.
    pthread_exit(NULL);   //terminate calling thread!
}
int CountWordsOfEuropeanTxtFile(char *szFileName)
{
    int nWords = 0;//词计数变量，初始值为0
    FILE *fp; //文件指针
    char carrBuffer[1024];//每行字符缓冲，每行最多1024个字符
    //打开文件
    if ((fp = fopen(szFileName,  "r")) == NULL)
    {
        return -1;  //文件打开不成功是返回-1
    }
    while (!feof(fp))//如果没有读到文件末尾 
    {
        //从文件中读一行
        if (fgets(carrBuffer, sizeof(carrBuffer),fp) != NULL)
            //统计每行词数
            nWords += CountWordsInOneLine(carrBuffer);
    }

    //关闭文件
    fclose(fp);
    return nWords;
}
int CountWordsInOneLine(const char *szLine)
{
    int nWords = 0;
    int i=0;
    for (;i<strlen(szLine);i++)
    {
        if (*(szLine+i)!=' ')
        {
            nWords++;
            while ((*(szLine+i)!=' ')&&(*(szLine+i)!=''))
            {
                i++;
            }
        }

    }
            //printf("%d	",nWords);
    
    return nWords;
}

客户端代码

#include<stdlib.h>
#include<sys/socket.h>
#include<sys/types.h>       //pthread_t , pthread_attr_t and so on.
#include<stdio.h>
#include<netinet/in.h>      //structure sockaddr_in
#include<arpa/inet.h>       //Func : htonl; htons; ntohl; ntohs
#include<assert.h>          //Func :assert
#include<string.h>          //Func :memset bzero
#include<unistd.h>          //Func :close,write,read
#define SOCK_PORT 9988
#define BUFFER_LENGTH 1024
int main()
{
    int sockfd;
    int tempfd;
    struct sockaddr_in s_addr_in;
    char data_send[BUFFER_LENGTH];
    char data_recv[BUFFER_LENGTH];
    memset(data_send,0,BUFFER_LENGTH);
    memset(data_recv,0,BUFFER_LENGTH);
    sockfd = socket(AF_INET,SOCK_STREAM,0);       //ipv4,TCP
    if(sockfd == -1)
    {
        fprintf(stderr,"socket error!
");
        exit(1);
    }
    //before func connect, set the attr of structure sockaddr.
    memset(&s_addr_in,0,sizeof(s_addr_in));
    s_addr_in.sin_addr.s_addr = inet_addr("127.0.0.1");      //trans char * to in_addr_t
    s_addr_in.sin_family = AF_INET;
    s_addr_in.sin_port = htons(SOCK_PORT);
    tempfd = connect(sockfd,(struct sockaddr *)(&s_addr_in),sizeof(s_addr_in));
    if(tempfd == -1)
    {
        fprintf(stderr,"Connect error! 
");
        exit(1);
    }
    while(1)
    {
        printf("Please Input File Name On Server(input "quit" to quit):	");
    scanf("%s", data_send);        
    //gets(data_send);
        //scanf("%[^
]",data_send);         //or you can also use this
        tempfd = write(sockfd,data_send,BUFFER_LENGTH);
        if(tempfd == -1)
        {
            fprintf(stderr,"write error
");
            exit(0);
        }

        if(strcmp(data_send,"quit") == 0)  //quit,write the quit request and shutdown client
        {
            break;
        }
        else
        {
            tempfd = read(sockfd,data_recv,BUFFER_LENGTH);
            assert(tempfd != -1);
            printf("%s
",data_recv);
            memset(data_send,0,BUFFER_LENGTH);
            memset(data_recv,0,BUFFER_LENGTH);
        }
    char buffer[BUFFER_LENGTH];
    int length=0;
    bzero(buffer, BUFFER_LENGTH);
        length = recv(sockfd, buffer, BUFFER_LENGTH, 0);
        buffer[length] = '';
        printf("count=%s
", buffer);
        bzero(buffer, BUFFER_LENGTH);
    }
    int ret = shutdown(sockfd,SHUT_WR);       //or you can use func close()--<unistd.h> to close the fd
    assert(ret != -1);
    return 0;
}

实验截图

多线程处理的优缺点：

• 同步应用程序的开发比较容易，但由于需要在上一个任务完成后才能开始新的任务，其效率通常比多线程应用程序低。如果完成同步任务所用的时间比预计时间长，应用程序可能会不响应。