2017-2018-11 20155307刘浩 20155338常胜杰 20155335俞昆 实验三 实时系统实验报告

2017-2018-11 20155307刘浩 20155338常胜杰 20155335俞昆 实验三 实时系统

实验目的

要实现客户端和服务器的通信，这些我们在计算机网络中学过，具体为：客户端：socket()→bind()→connect()→send()→recv()→close()，然后服务器：socket()→bind()→accept()→recv()→send()→close()

为了正确实现统计单词个数的功能，找到其与wc命令的关系，先用「man 1 wc」查看wc命令的manpages，如下所示：



可见，wc命令的功能是统计指定文件中的字节数、字数、行数，

发现他的参数等信息如下：

实验代码如下：点击链接即可

或者这个是客户端，

#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 PORT 155307

#define MAXDATASIZE 100

int main(int argc, char *argv[])
{
int sockfd, num;
char buf[MAXDATASIZE];
struct hostent *he;
struct sockaddr_in server;

if (argc != 3)
{
printf("Usage: %s <IP Address><Filename>\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("server message: %s\n",buf);

close(sockfd);
return 0;
}

这个是服务器：

#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 155307

#define BACKLOG 1
#define MAXRECVLEN 1024

int main(int argc, char *argv[])
{
char buf[MAXRECVLEN];
int listenfd, connectfd;
struct sockaddr_in server;
struct sockaddr_in client;
socklen_t addrlen;

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)
{

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 at time %ld.%ld\n",inet_ntoa(client.sin_addr),htons(client.sin_port), 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,"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
= '\0';
strcat(buf,"\n");
strcat(buf,str);
strcat(buf,"(");
strcat(buf,d);
strcat(buf,"单词数)");strcat(buf,"\n");

}else
{
close(connectfd);
break;
}

send(connectfd, buf, iret, 0);
}

close(listenfd);
return 0;
}

最后的结果：




代码如下：

#include<stdlib.h>
int main(int argc, char *argv[])
{
char ch;
FILE *fp;
long count=0;
char s[21];
if(argc !=2)
{
printf("文件名为：%s\n",argv[0]);
exit(EXIT_FAILURE);
}
exit(EXIT_FAILURE);
}
while(fscanf(fp,"%s",s)!=EOF)
count++;
fclose(fp);
printf("File %s has %ld characters\n",argv[1],count);
return 0;
}

或者可以去这里看一下

实验结果：

实验感想：此次实验在Linux下实现了wc命令统计文本文件中的单词数，在任务二中创建了一个并发服务器，节省了时间。可以使服务器同时为多个客户端服务了。

实验一完成的过程中还不是很困难，只是实验二中要注意下windows的socket转入linux时需要做的一系列改变。