2018-2019-1 20165303 实验三实时系统

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发布时间：2019-06-20

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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

上方提交代码

附件提交测试截图，至少要测试附件中的两个文件

命令参数：
-c 统计字节数。
-l 统计行数。
-m 统计字符数。这个标志不能与 -c 标志一起使用。
-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。
-L 打印最长行的长度。
-help 显示帮助信息
--version 显示版本信息

server
´´´

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 PORT 155306

define BACKLOG 1

define MAXRECVLEN 1024

int main(int argc, char argv[])

{

char buf[MAXRECVLEN];
int listenfd, connectfd; / socket descriptors /
struct sockaddr_in server; / server's address information /
struct sockaddr_in client; / client's address information /
socklen_t addrlen;
/ Create TCP socket /
if ((listenfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
{

/ handle exception */

perror("socket() error. Failed to initiate a socket");

exit(1);

}

/* set socket option */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(" Client ip :  %s \n",inet_ntoa(client.sin_addr));  printf(" Port id : %d \n ",htons(client.sin_port));  printf("Time is %ld.%ld\n",tv.tv_sec,tv.tv_usec);        int iret=-1;    char d[1024];     iret = recv(connectfd, buf, MAXRECVLEN, 0);        if(iret>0)        {           strcpy(d,buf);            stream = fopen(buf,"r");            bzero(buf, sizeof(buf));            //strcat(buf,"Word number:");

strcat(buf,"Word number:");

char s[21];

long int count = 0;

while(fscanf(stream,"%s",s)!=EOF)

count++;

char str[10];

sprintf(str, " %ld\n", count);

int n = sizeof(str);

str[n] = '\0';

strcat(buf,"\n");

//strcat(buf,"\t");strcat(buf,str);

printf("\n");

strcat(buf,"\n");

}else        {            close(connectfd);            break;        }        /* print client's ip and port */        send(connectfd, buf, iret, 0); /* send to the client welcome message */    }close(listenfd); /* close listenfd */return 0;

}

´´´

client
´´´

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> /* netdb is necessary for struct hostent */

define PORT 155306 /* server port */

define MAXDATASIZE 100

int main(int argc, char argv[])

{

int sockfd, num; / files descriptors /
char buf[MAXDATASIZE]; / buf will store received text /
struct hostent he; /* structure that will get information about remote host */

struct sockaddr_in server;

if (argc != 3){    printf("Usage: %s 
    
     
      \n",argv[0]);    exit(1);}if((he=gethostbyname(argv[1]))==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[2]);

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(" Successful! \n %s\n",buf);

close(sockfd);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

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

server
´´´

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!\n");
exit(1);
}
fd_temp = listen(sockfd_server,MAX_CONN_LIMIT);
if(fd_temp == -1)
{

fprintf(stderr,"listen error!\n");
exit(1);
}
while(1)
{

printf("waiting for new connection...\n");
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!\n");
continue; //ignore current socket ,continue while loop.
}
printf("A new connection occurs!\n");
if(pthread_create(&thread_id,NULL,(void )(&Data_handle),(void )(&sockfd)) == -1)
{

fprintf(stderr,"pthread_create error!\n");
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\n");
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!\n";
while(1)
{

printf("waiting for file_name...\n");
//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\n");
break;
}
if(i_recvBytes == -1)
{

fprintf(stderr,"read error!\n");
break;
}
if(strcmp(data_recv,"quit")==0)
{

printf("Quit command!\n");
break; //Break the while loop.
}
printf("read from client : %s\n",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...\n");
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)!='\0'))
{

i++;
}
}

}
//printf("%d\t",nWords);

return nWords;
}
´´´

client
´´´

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!\n");
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! \n");
exit(1);
}
while(1)
{

printf("Please Input File Name On Server(input "quit" to quit):\t");
scanf("%s", data_send);
//gets(data_send);
//scanf("%[^\n]",data_send); //or you can also use this
tempfd = write(sockfd,data_send,BUFFER_LENGTH);
if(tempfd == -1)
{

fprintf(stderr,"write error\n");
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\n",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] = '\0';
printf("count=%s\n", 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;
}
´´´