20175203-20175206 实验三《实时系统》
本小组成员20175203、20175206
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
Linux系统中的wc(Word Count)命令的功能为统计指定文件中的字节数、字数、行数，并将统计结果显示输出
命令格式：wc [选项]文件
命令功能：统计指定文件中的字节数、字数、行数，并将统计结果显示输出。该命令统计指定文件中的字节数、字数、行数。如果没有给出文件名，则从标准输入读取。wc同时也给出所指定文件的总统计数。
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
服务端
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#define MYPORT 165318
void main(){
int serverfd, clientfd;
struct sockaddr_in my_addr;
struct sockaddr_in remote_addr;
char buffer[BUFSIZ];
memset(&my_addr, 0, sizeof(my_addr));
my_addr.sin_family=AF_INET;
my_addr.sin_addr.s_addr=INADDR_ANY;
my_addr.sin_port=htons(MYPORT);
if((serverfd=socket(PF_INET, SOCK_STREAM, 0))==-1){
perror("socket");
}
if(bind(serverfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr))<0){
perror("bind");
}
listen(serverfd, 5);
int addrlen=sizeof(struct sockaddr_in);
while(1){
if((clientfd=accept(serverfd, (struct sockaddr *)&remote_addr, &addrlen))<0){
perror("accept");
}
printf("accept client %s
", inet_ntoa(remote_addr.sin_addr));
int len, i;
long wordscount=0;
int flag=1;
while(1){
if((len=recv(clientfd, buffer, 1024, 0))>0){
for(i=0; i<len; i++){
if(flag==0){
switch(buffer[i]){
case ' ':
wordscount++;
break;
case '
':
wordscount++;
break;
case '
':
wordscount++;
break;
default:
break;
}
}
if(buffer[i]== ' ' || buffer[i]=='
' || buffer[i]=='
') flag=1;
else flag=0;
}
}
if(len<1024) break;
}
send(clientfd, &wordscount, sizeof(long), 0);
close(clientfd);
}
close(serverfd);
}
客户端
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#define MYPORT 165318
void main(){
int clientfd;
struct sockaddr_in remote_addr;
char buffer[BUFSIZ];
memset(&remote_addr, 0 , sizeof(remote_addr));
remote_addr.sin_family=AF_INET;
remote_addr.sin_addr.s_addr=inet_addr("127.0.0.1");
remote_addr.sin_port=htons(MYPORT);
if((clientfd=socket(PF_INET,SOCK_STREAM,0))<0){
perror("socket");
}
if(connect(clientfd, (struct sockaddr *)&remote_addr, sizeof(struct sockaddr))<0){
perror("connect");
}
int len;
FILE *fp;
char path[20];
gets(path);
fp=fopen(path, "r");
char readch;
int i=0;
while((readch=fgetc(fp))!=EOF){
if(i<1024){
buffer[i]=readch;
i++;
}
else{
i=0;
int n=send(clientfd, buffer, 1024, 0);
}
}
fclose(fp);
if(i!=0)
send(clientfd, buffer, i, 0);
long wordscount;
recv(clientfd, &wordscount, sizeof(long), 0);
printf("%ld
", wordscount);
close(clientfd);
}
实验截图
任务二
1.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
2.对比单线程版本的性能，并分析原因
服务端
#include<stdlib.h>
#include<pthread.h>
#include<sys/socket.h>
#include<sys/types.h>
#include<stdio.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<assert.h>
#include<string.h>
#include<unistd.h>
#define SOCK_PORT 9988
#define BUFFER_LENGTH 1024
#define MAX_CONN_LIMIT 512
static void Data_handle(void * sock_fd);
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);
assert(sockfd_server != -1);
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);
s_addr_in.sin_port = htons(SOCK_PORT);
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);
sockfd = accept(sockfd_server,(struct sockaddr * restrict)(&s_addr_client),(socklen_t *)(&client_length));
if(sockfd == -1)
{
fprintf(stderr,"Accept error!
");
continue;
}
printf("A new connection occurs!
");
if(pthread_create(&thread_id,NULL,(void *)(&Data_handle),(void *)(&sockfd)) == -1)
{
fprintf(stderr,"pthread_create error!
");
break;
}
}
int ret = shutdown(sockfd_server,SHUT_WR);
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...
");
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;
}
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;
}
}
printf("terminating current client_connection...
");
close(fd);
pthread_exit(NULL);
}
int CountWordsOfEuropeanTxtFile(char *szFileName)
{
int nWords = 0;
FILE *fp; //文件指针
char carrBuffer[1024]
if ((fp = fopen(szFileName, "r")) == NULL)
{
return -1;
}
while (!feof(fp))
{
if (fgets(carrBuffer, sizeof(carrBuffer),fp) != NULL)
nWords += CountWordsInOneLine(carrBuffer);
}
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++;
}
}
}
return nWords;
}
客户端
#include<stdlib.h>
#include<sys/socket.h>
#include<sys/types.h>
#include<stdio.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<assert.h>
#include<string.h>
#include<unistd.h>
#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);
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");
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);
tempfd = write(sockfd,data_send,BUFFER_LENGTH);
if(tempfd == -1)
{
fprintf(stderr,"write error
");
exit(0);
}
if(strcmp(data_send,"quit") == 0)
{
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);
assert(ret != -1);
return 0;
}
实验截图
分析单线程和多线程
单线程一次只允许一个客户端连接，易于实现，稳定安全但是无法实现多线程服务
多线程一次可以允许多个客户端连接，工作效率更高，但是可能不太稳定
任务三
交叉编译多线程版本服务器并部署到实验箱中
PC机作客户端测试wc服务器
提交测试截图
因为是交叉编译，即使用armgcc进行编译，与第一个实验的环境一致，所以首先ping通虚拟机和超级终端：
用ping命令使目标机和宿主机能互相ping通，ping通的截图如下:
虚拟机ping超级终端：
超级终端ping虚拟机：
实验截图
用arm-none-linux-gnuenbi-gcc编译的命名为armserver: /usr/local/toolchain/toolchain-4.3.2/bin/arm-none-linux-gnueabi-gcc server.c -o armserver
对需要共享的文件进行赋予权限：
打开Ubuntu命令行终端，配置/etc/exports:
sudo vim /etc/exports
在文件/etc/exports中进行了允许挂载权限的定义,在/etc/exports文件末添加如下一行：
/home/linux/linux_20175203_20175206 *(rw,sync,no_root_squash,no_subtree_check)
然后使用权限更新命令sudo /etc/init.d/nfs-kernel-server restart来重启服务
