2017-2018-1 20155209 实验三 实时系统

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man 1 wc查看wc
• 代码实现如下：
• 客户端

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

#define RIO_BUFSIZE 8192

typedef struct{
    int rio_fd;
    int rio_cnt;
    char *rio_bufptr;
    char rio_buf[RIO_BUFSIZE];

}rio_t;

#define MAXLINE 200

int main(int argc,char **argv){

    int clientfd,port;
    char *host,buf[MAXLINE];
    char sbuf[MAXLINE];
    char rbuf[MAXLINE];
    rio_t rio;
    char str1[MAXLINE]="客户端IP:";
    char str2[MAXLINE]="服务器实现者学号:20155209”;

    char str3[MAXLINE]="当地时间:";

    FILE *fp;

    char filename[MAXLINE];

    if(argc!=3){

        fprintf(stderr,"usage:%s <host> <port>\n",argv[0]);
        exit(0);
    }
    host = argv[1];
    port = atoi(argv[2]);

    clientfd = open_clientfd(host,port);

    while(1){

        printf("输入文件名(.txt):\n");

        gets(filename);

        fp = fopen(filename,"rb");

        while(!feof(fp)){

        fgets(sbuf,MAXLINE,fp);

        send(clientfd,sbuf,MAXLINE,0);

        bzero(sbuf,sizeof(sbuf));
        }

        printf("%s",str1);
        puts(host);

        printf("%s",str2);
        putchar(‘\n‘);

        //printf("%s",str3);

        //puts(rbuf);

        fclose(fp);

        //sleep(1000);

        //recv(clientfd,rbuf,MAXLINE,0);

        //printf("传输完成，该文件单词数为%s\n!",rbuf);

        //puts(rbuf);

        close(clientfd);

        exit(0);
    }

}

• 服务器

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

#define MAXLINE 200
#define RIO_BUFSIZE 8192

typedef struct{
    int rio_fd;
    int rio_cnt;
    char *rio_bufptr;
    char rio_buf[RIO_BUFSIZE];

}rio_t;

typedef struct sockaddr SA;

typedef struct{
int tm_sec;
int tm_min;
int tm_hour;
int tm_mday;
int tm_mon;
int tm_year;
int tm_wday;
int tm_yday;
int tm_isdst;
}tm;

void sigchld_handler(int sig){

    pid_t pid;
    int stat;

    while((pid = waitpid(-1,&stat,WNOHANG))>0){
        printf("child %d terminated\n",pid);
    }
    return;
}

void itoa (int n,char s[])
{
    int i,j,sign;
    char temp[MAXLINE];

    if((sign=n)<0)//记录符号
        n=-n;//使n成为正数
    i=0;
    do{
               temp[i++]=n%10+‘0‘;//取下一个数字
    }
    while ((n/=10)>0);//删除该数字
    if(sign<0)
        temp[i++]=‘-‘;

    for(j=0;j<i;j++){//生成的数字是逆序的，所以要逆序输出
        s[j] = temp[i-j-1];
    }
    s[i] = ‘\0‘;
} 

int main(int argc,char **argv){

    int count=0,cnt=0,listenfd,connfd,port,clientlen;
    struct sockaddr_in clientaddr;
    struct hostent *hp;
    char *haddrp;
    char sbuf[MAXLINE];
   // char *bufp = sbuf;
    char rbuf[MAXLINE];
    rio_t rio;
    time_t lt;
    tm *local;
    char str1[MAXLINE]="客户端IP:";
    char str2[MAXLINE]="服务器实现者学号:";
    char str3[MAXLINE]="当地时间:";

    FILE *fp = fopen("test.txt","wb");

    if(argc != 2){

        fprintf(stderr,"usage:%s <port>\n",argv[0]);
        exit(0);
    }

    port = atoi(argv[1]);

    signal(SIGCHLD,sigchld_handler);
    listenfd = open_listenfd(port);
    while(1){

        clientlen = sizeof(clientaddr);
        connfd = accept(listenfd,(SA *)&clientaddr,&clientlen);

        hp = gethostbyaddr((const char*)&clientaddr.sin_addr.s_addr,
                sizeof(clientaddr.sin_addr.s_addr),AF_INET);
        haddrp = inet_ntoa(clientaddr.sin_addr);
        printf("server connected to %s (%s)\n",hp->h_name,haddrp);

        if(fork() == 0){
        close(listenfd);

        /*
        lt = time(NULL);
        local = localtime(&lt);
        strftime(sbuf,64,"%Y-%m-%d %H:%M:%S",local);
        */

        while(cnt = recv(connfd,rbuf,MAXLINE,0)){

        //printf("%d\n",recv(connfd,rbuf,MAXLINE,0));
        fputs(rbuf,fp);
        bzero(rbuf,sizeof(rbuf));

        count += cnt;
        }

        //printf("传输成功!,该文件单词数共%d\n!",count);

        fclose(fp);

        itoa(count,sbuf);

        //send(connfd,sbuf,MAXLINE,0);

        printf("该文件单词数为%s!\n",sbuf);

        close(connfd);
        exit(0);
        }

        close(connfd);
    }
}

• 实现截图：
• 

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

• 代码实现如下：
• 客户端

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

#define RIO_BUFSIZE 8192

typedef struct{
    int rio_fd;
    int rio_cnt;
    char *rio_bufptr;
    char rio_buf[RIO_BUFSIZE];

}rio_t;

#define MAXLINE 200

int main(int argc,char **argv){

    int clientfd,port;
    char *host,buf[MAXLINE];
    char sbuf[MAXLINE];
    char rbuf[MAXLINE];
    rio_t rio;
    char str1[MAXLINE]="客户端IP:";
    char str2[MAXLINE]="服务器实现者学号:20155209”;

    char str3[MAXLINE]="当地时间:";

    FILE *fp;

    char filename[MAXLINE];

    if(argc!=3){

        fprintf(stderr,"usage:%s <host> <port>\n",argv[0]);
        exit(0);
    }
    host = argv[1];
    port = atoi(argv[2]);

    clientfd = open_clientfd(host,port);

    while(1){

        printf("输入文件名(.txt):\n");

        gets(filename);

        fp = fopen(filename,"rb");

        while(!feof(fp)){

        fgets(sbuf,MAXLINE,fp);

        send(clientfd,sbuf,MAXLINE,0);

        bzero(sbuf,sizeof(sbuf));
        }

        printf("%s",str1);
        puts(host);

        printf("%s",str2);
        putchar(‘\n‘);

        //printf("%s",str3);

        //puts(rbuf);

        fclose(fp);

        //sleep(1000);

        //recv(clientfd,rbuf,MAXLINE,0);

        //printf("传输完成，该文件单词数为%s\n!",rbuf);

        //puts(rbuf);

        close(clientfd);

        exit(0);
    }

}

• 服务器

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

#define MAXLINE 200
#define RIO_BUFSIZE 8192

typedef struct{
    int rio_fd;
    int rio_cnt;
    char *rio_bufptr;
    char rio_buf[RIO_BUFSIZE];

}rio_t;

typedef struct sockaddr SA;

typedef struct{
int tm_sec;
int tm_min;
int tm_hour;
int tm_mday;
int tm_mon;
int tm_year;
int tm_wday;
int tm_yday;
int tm_isdst;
}tm;

void itoa (int n,char s[]);

void *thread(void *vargp);

int main(int argc,char **argv){

    int listenfd,*connfdp,port;
    int clientlen;
    struct sockaddr_in clientaddr;
    struct hostent *hp;
    char *haddrp;
    pthread_t tid;

    if(argc != 2){

        fprintf(stderr,"usage:%s <port>\n",argv[0]);
        exit(0);
    }

    port = atoi(argv[1]);

    listenfd = open_listenfd(port);

    while(1){

        clientlen = sizeof(clientaddr);

        connfdp =malloc(sizeof(int));

        *connfdp = accept(listenfd,(SA *)&clientaddr,&clientlen);

        hp = gethostbyaddr((const char*)&clientaddr.sin_addr.s_addr,
                sizeof(clientaddr.sin_addr.s_addr),AF_INET);

        haddrp = inet_ntoa(clientaddr.sin_addr);

        printf("server connected to %s (%s)\n",hp->h_name,haddrp);

        pthread_create(&tid,NULL,thread,connfdp);

        pthread_join(tid,NULL);
    }
}

void *thread(void *vargp){

    time_t lt;
    tm *local;
    char sbuf[MAXLINE];
    int cnt = 0,count = 0;
    char *fp = fopen("test.txt","wb");
    char rbuf[MAXLINE];
    int connfd = *((int*)vargp);

    free(vargp);

    pthread_detach(pthread_self());

    /*lt = time(NULL);
    local = localtime(&lt);
    strftime(sbuf,64,"%Y-%m-%d %H:%M:%S",local);
    send(connfd,sbuf,MAXLINE,0);
    */
while(cnt = recv(connfd,rbuf,MAXLINE,0)){

        //printf("%d\n",recv(connfd,rbuf,MAXLINE,0));
        fputs(rbuf,fp);
        bzero(rbuf,sizeof(rbuf));

        count += cnt;
        }

        //printf("传输成功!,该文件单词数共%d\n!",count);

        fclose(fp);

        itoa(count,sbuf);

        //send(connfd,sbuf,MAXLINE,0);

        printf("该文件单词数为%s!\n",sbuf);

    close(connfd);

    return NULL;
}

void itoa (int n,char s[])
{
    int i,j,sign;
    char temp[MAXLINE];

    if((sign=n)<0)//记录符号
        n=-n;//使n成为正数
    i=0;
    do{
               temp[i++]=n%10+‘0‘;//取下一个数字
    }
    while ((n/=10)>0);//删除该数字
    if(sign<0)
        temp[i++]=‘-‘;

    for(j=0;j<i;j++){//生成的数字是逆序的，所以要逆序输出
        s[j] = temp[i-j-1];
    }
    s[i] = ‘\0‘;
}

• 程序运行结果截图：
• 
• 实验中遇到的问题：在自己电脑（Mac）运行代码出现如下问题：Static library link issue with Mac OS X: symbol(s) not found for architecture x86_64。
• 解决方法：在网上寻找了许多方法都不能编译成功。最后在Mac里安装了Linux虚拟机，在虚拟机里做这个实验了。