20155332 实验三

任务一：

    1.学习使用Linux命令wc(1)
  2.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
  3.客户端传一个文本文件给服务器
  4.服务器返加文本文件中的单词数

客户端

#include<netinet/in.h> 
#include<sys/types.h>  
#include<sys/socket.h> 
#include<stdio.h>   
#include<stdlib.h>   
#include<string.h>   
#define SERVER_PORT 5201
#define LENGTH_OF_LISTEN_QUEUE 20
#define BUFFER_SIZE 1024
#define FILE_NAME_MAX_SIZE 512
#define MAX 10000000

int main(void)
{
  // 声明并初始化一个服务器端的socket地址结构
  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);
  
  // 创建socket，若成功，返回socket描述符
  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));
  
  // 绑定socket和socket地址结构
  if(-1 == (bind(server_socket_fd, (struct sockaddr*)&server_addr, sizeof(server_addr))))
      {
            perror("Server Bind Failed:");
            exit(1);
          }
    
  // socket监听
  if(-1 == (listen(server_socket_fd, LENGTH_OF_LISTEN_QUEUE)))
      {
            perror("Server Listen Failed:");
            exit(1);
          }
  
  while(1)
      {
            // 定义客户端的socket地址结构
            struct sockaddr_in client_addr;
            socklen_t client_addr_length = sizeof(client_addr);
          
            // 接受连接请求，返回一个新的socket(描述符)，这个新socket用于同连接的客户端通信
            // accept函数会把连接到的客户端信息写到client_addr中
            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;
                    }
          
            // recv函数接收数据到缓冲区buffer中
            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;
                    }
          
            // 然后从buffer(缓冲区)拷贝到file_name中
            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\n", file_name);
          
            // 打开文件并读取文件数据
            FILE *fp = fopen(file_name, "r");
            if(NULL == fp)
                {
                      printf("File:%s Not Found\n", file_name);
                    } 
            else
                {
                printf("buffer:%s\n",buffer);//buffer为filename
                
                char *argv[]={"wc","-w",file_name,0};
                execvp( "wc" ,argv);
                
                       
                      fclose(fp); 
                      
                    } 
            // 关闭与客户端的连接 
            close(new_server_socket_fd); 
          } 
  // 关闭监听用的socket 
  close(server_socket_fd); 
  return 0; 
}

服务器

    #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 8000
    #define LENGTH_OF_LISTEN_QUEUE 20
    #define BUFFER_SIZE 1024
    #define FILE_NAME_MAX_SIZE 512

void itoa(int i,char* string)
{
    int power,j;
    j=i;
    for(power=1;j>=10;j/=10)
        power*=10;
    for(;power>0;power/=10)
    {
        *string++=‘0‘+i/power;
        i%=power;
    }
    *string=‘\0‘;
}

int main(void)
{
  // 声明并初始化一个服务器端的socket地址结构
  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);

  // 创建socket，若成功，返回socket描述符
  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));

  // 绑定socket和socket地址结构
  if(-1 == (bind(server_socket_fd, (struct sockaddr*)&server_addr, sizeof(server_addr))))
  {
    perror("Server Bind Failed:");
    exit(1);
  }

  // socket监听
  if(-1 == (listen(server_socket_fd, LENGTH_OF_LISTEN_QUEUE)))
  {
    perror("Server Listen Failed:");
    exit(1);
  }

  while(1)
  {
    // 定义客户端的socket地址结构
    struct sockaddr_in client_addr;
    socklen_t client_addr_length = sizeof(client_addr);

    // 接受连接请求，返回一个新的socket(描述符)，这个新socket用于同连接的客户端通信
    // accept函数会把连接到的客户端信息写到client_addr中
    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;
    }

    // recv函数接收数据到缓冲区buffer中
    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;
    }

    // 然后从buffer(缓冲区)拷贝到file_name中
    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\n", file_name);

    // 打开文件并读取文件数据
    FILE *fp = fopen(file_name, "w");
    if(NULL == fp)
    {
      printf("File:%s Not Found\n", file_name);
    }
    else
    {
      bzero(buffer, BUFFER_SIZE);
      int length = 0;
      // 每读取一段数据，便将其发送给客户端，循环直到文件读完为止
      char*ch="bye";
    while((length = recv(new_server_socket_fd, buffer, 1024, 0)) > 0)
    {
    if(strcmp(buffer,ch)==0)break;
    if(fwrite(buffer, sizeof(char), length, fp) < length)
    {
      printf("File:\t%s Write Failed\n", file_name);
      break;
    }
    bzero(buffer, BUFFER_SIZE);
    }fclose(fp);
    int count=0;
    char s[21];
    FILE *fp1;
    if((fp1=fopen(file_name,"r"))==NULL){
        printf("Open the file failure...\n");
        exit(0);
    }
    while(fscanf(fp,"%s",s)!=EOF)
        count++;
    fclose(fp1);
    itoa(count,buffer);
    printf("There is(are) %s word(s) in the text.\n",buffer);
      // 关闭文件

      send(new_server_socket_fd, buffer, strlen(buffer), 0);
      printf("File:%s Transfer Successful!\n", file_name);
    }
    // 关闭与客户端的连接
    close(new_server_socket_fd);
    }
    // 关闭监听用的socket
    close(server_socket_fd);
    return 0;
    }

任务二

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

#include <sys/time.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#define BACKLOG 1
#define MAXRECVLEN 10240

int main(int argc, char *argv[])
{
    char buf[MAXRECVLEN];
    int listenfd, connectfd;  
    int port;
    struct sockaddr_in server; 
    struct sockaddr_in client; 
    socklen_t addrlen;
    if (argc != 2) {
    fprintf(stderr, "usage: %s <port>\n", argv[0]);
    exit(0);
    }
    port = atoi(argv[1]);
    
    if ((listenfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
    {
        
        perror("socket() error. Failed to initiate a socket");
        exit(1);
    }
 
    
    int opt = SO_REUSEADDR;
    setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));

    bzero(&server, sizeof(server));

    server.sin_family = AF_INET;
    server.sin_port = htons(port);
    server.sin_addr.s_addr = htonl(INADDR_ANY);
    if(bind(listenfd, (struct sockaddr *)&server, sizeof(server)) == -1)
    {
        /* handle exception */
        perror("Bind() error.");
        exit(1);
    }
    
    if(listen(listenfd, BACKLOG) == -1)
    {
        perror("listen() error. \n");
        exit(1);
    }

    addrlen = sizeof(client);
    while(1){
        if((connectfd=accept(listenfd,(struct sockaddr *)&client, &addrlen))==-1)
          {
            perror("accept() error. \n");
            exit(1);
          }
        FILE *stream;
        struct timeval tv;
        gettimeofday(&tv, NULL);
          printf("You got a connection from client‘s ip %s, port %d ",inet_ntoa(client.sin_addr),port);
        
        int iret=-1;
        char d[10240];
         iret = recv(connectfd, buf, MAXRECVLEN, 0);
            if(iret>0)
            {
               strcpy(d,buf);
                stream = fopen(buf,"r");
                bzero(buf, sizeof(buf));
                strcat(buf,"单词数：");
                char s[21];
long int count = 0;
                while(fscanf(stream,"%s",s)!=EOF)
                count++;
                char str[10];
sprintf(str, "%ld", count); 
int n = sizeof(str);
str[n] = ‘\0‘; 
strcat(buf,str);
strcat(buf,"\n");
                
            }else
            {
                close(connectfd);
                break;
            }
            
            send(connectfd, buf, iret, 0); 
    
    close(listenfd); 
    return 0;
}
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h> 
#define MAXDATASIZE 100

int main(int argc, char *argv[])
{
    int sockfd, num;    
    int port;
    char buf[MAXDATASIZE];   
    struct hostent *he;    
    
    if (argc != 4)
    {
        printf("Usage: %s <PORT><IP Address><Filename>\n",argv[0]);
        exit(1);
    }
    port = atoi(argv[1]);
    if((he=gethostbyname(argv[2]))==NULL)
    {
        printf("gethostbyname() error\n");
        exit(1);
    }
    
    if((sockfd=socket(AF_INET,SOCK_STREAM, 0))==-1)
    {
        printf("socket() error\n");
        exit(1);
    }
    bzero(&server,sizeof(server));
    server.sin_family = AF_INET;
    server.sin_port = htons(port);
    server.sin_addr = *((struct in_addr *)he->h_addr);
    if(connect(sockfd, (struct sockaddr *)&server, sizeof(server))==-1)
    {
        printf("connect() error\n");
        exit(1);
    }
char str[MAXDATASIZE] ;
strcpy(str,argv[3]);

if((num=send(sockfd,str,sizeof(str),0))==-1){
      printf("send() error\n");
        exit(1);
    }
    if((num=recv(sockfd,buf,MAXDATASIZE,0))==-1)
    {
        printf("recv() error\n");
        exit(1);
    }
    buf[num-1]=‘\0‘;
    printf("%s",buf);

    close(sockfd);
    return 0;
}