2018-2019-1 20165219 实验三 实时系统
任务一
实验要求
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
客户端
#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 165219
#define BUFFER_SIZE 1024
#define FILE_NAME_MAX_SIZE 512
int main()
{
struct sockaddr_in client_addr;
bzero(&client_addr, sizeof(client_addr));
client_addr.sin_family = AF_INET;
client_addr.sin_addr.s_addr = htons(INADDR_ANY);
client_addr.sin_port = htons(0);
int client_socket_fd = socket(AF_INET, SOCK_STREAM, 0);
if(client_socket_fd < 0)
{
perror("Create Socket Failed:");
exit(1);
}
if(-1 == (bind(client_socket_fd, (struct sockaddr*)&client_addr, sizeof(client_addr))))
{
perror("Client Bind Failed:");
exit(1);
}
struct sockaddr_in server_addr;
bzero(&server_addr, sizeof(server_addr));
server_addr.sin_family = AF_INET;
if(inet_pton(AF_INET, "127.0.0.1", &server_addr.sin_addr) == 0)
{
perror("Server IP Address Error:");
exit(1);
}
server_addr.sin_port = htons(SERVER_PORT);
socklen_t server_addr_length = sizeof(server_addr);
if(connect(client_socket_fd, (struct sockaddr*)&server_addr, server_addr_length) < 0)
{
perror("Can Not Connect To Server IP:");
exit(0);
}
char file_name[FILE_NAME_MAX_SIZE+1];
bzero(file_name, FILE_NAME_MAX_SIZE+1);
printf("Please Input File Name On Server: ");
scanf("%s", file_name);
char buffer[BUFFER_SIZE];
bzero(buffer, BUFFER_SIZE);
strncpy(buffer, file_name, strlen(file_name)>BUFFER_SIZE?BUFFER_SIZE:strlen(file_name));
if(send(client_socket_fd, buffer, BUFFER_SIZE, 0) < 0)
{
perror("Send File Name Failed:");
exit(1);
}
FILE *fp = fopen(file_name, "w");
if(NULL == fp)
{
printf("File: %s Can Not Open To Write
", file_name);
exit(1);
}
bzero(buffer, BUFFER_SIZE);
int length = 0;
while((length = recv(client_socket_fd, buffer, BUFFER_SIZE, 0)) > 0)
{
if(fwrite(buffer, sizeof(char), length, fp) < length)
{
printf("File: %s Write Failed
", file_name);
break;
}
bzero(buffer, BUFFER_SIZE);
}
printf("Send File: %s Successful!
", file_name);
close(fp);
close(client_socket_fd);
char *argv[]={"wc","-w",file_name,0};
execvp("wc",argv);
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
int main(void)
{
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);
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));
if(-1 == (bind(server_socket_fd, (struct sockaddr*)&server_addr, sizeof(server_addr))))
{
perror("Server Bind Failed:");
exit(1);
}
if(-1 == (listen(server_socket_fd, LENGTH_OF_LISTEN_QUEUE)))
{
perror("Server Listen Failed:");
exit(1);
}
while(1)
{
struct sockaddr_in client_addr;
socklen_t client_addr_length = sizeof(client_addr);
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;
}
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;
}
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
", file_name);
FILE *fp = fopen(file_name, "r");
if(NULL == fp)
{
printf("File:%s Not Found
", file_name);
}
else
{
bzero(buffer, BUFFER_SIZE);
int length = 0;
while((length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0)
{
if(send(new_server_socket_fd, buffer, length, 0) < 0)
{
printf("Send File:%s Failed./n", file_name);
break;
}
bzero(buffer, BUFFER_SIZE);
}
fclose(fp);
printf("File:%s Transfer Successful!
", file_name);
}
close(new_server_socket_fd);
}
close(server_socket_fd);
return 0;
}
任务二
实验要求
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
服务器
#include "csapp.h"
#include<stdio.h>
#include<stdlib.h>
static int byte_cnt; /* byte counter */
static sem_t mutex;
#define NTHREADS 4
#define SBUFSIZE 16
typedef struct {
int *buf; /* Buffer array */
int n; /* Maximum number of slots */
int front; /* buf[(front+1)%n] is first item */
int rear; /* buf[rear%n] is last item */
sem_t mutex; /* Protects accesses to buf */
sem_t slots; /* Counts available slots */
sem_t items; /* Counts available items */
} sbuf_t;
void echo_cnt(int connfd);
void *thread(void *vargp);
int wc(char *name)
{
char ch;
FILE *fp;
long count=0;
char s[21];
if ((fp=fopen(name,"r+"))==NULL)
{
fprintf(stderr,"不能打开文件
");
exit(EXIT_FAILURE);
}
while(fscanf(fp,"%s",s)!=EOF)
count++;
fclose(fp);
printf("File %s has %ld characters
",name,count);
return 0;
}
sbuf_t sbuf; /* shared buffer of connected descriptors */
int main(int argc, char **argv)
{
int i, listenfd, connfd, port, clientlen=sizeof(struct sockaddr_in);
struct sockaddr_in clientaddr;
pthread_t tid;
if (argc != 2) {
fprintf(stderr, "usage: %s <port>
", argv[0]);
exit(0);
}
port = atoi(argv[1]);
sbuf_init(&sbuf, SBUFSIZE);
listenfd = Open_listenfd(port);
for (i = 0; i < NTHREADS; i++) /* Create worker threads */
Pthread_create(&tid, NULL, thread, NULL);
while (1) {
connfd = Accept(listenfd, (SA *) &clientaddr, &clientlen);
sbuf_insert(&sbuf, connfd); /* Insert connfd in buffer */
}
}
static void init_echo_cnt(void)
{
Sem_init(&mutex, 0, 1);
byte_cnt = 0;
}
void echo_cnt(int connfd)
{
int n,x;
long int count;
char buf[MAXLINE];
char name[MAXLINE]
rio_t rio;
static pthread_once_t once = PTHREAD_ONCE_INIT;
Pthread_once(&once, init_echo_cnt);
Rio_readinitb(&rio, connfd);
while((n = Rio_readlineb(&rio, buf, MAXLINE)) != 0) {
P(&mutex);
byte_cnt += n;
/*x = sizeof(buf);
buf[x] = 0;
count = wc(buf);*/
printf("thread %d received %d (%d total) bytes on fd %d
",
(int) pthread_self(), n, byte_cnt, connfd);
//name = buf;
V(&mutex);
//sprint(buf,"%s:%ld characters".count);
Rio_writen(connfd, buf, n);
}
}
void sbuf_init(sbuf_t *sp, int n)
{
sp->buf = Calloc(n, sizeof(int));
sp->n = n; /* Buffer holds max of n items */
sp->front = sp->rear = 0; /* Empty buffer iff front == rear */
Sem_init(&sp->mutex, 0, 1); /* Binary semaphore for locking */
Sem_init(&sp->slots, 0, n); /* Initially, buf has n empty slots */
Sem_init(&sp->items, 0, 0); /* Initially, buf has zero data items */
}
/* $end sbuf_init */
/* Clean up buffer sp */
/* $begin sbuf_deinit */
void sbuf_deinit(sbuf_t *sp)
{
Free(sp->buf);
}
/* $end sbuf_deinit */
/* Insert item onto the rear of shared buffer sp */
/* $begin sbuf_insert */
void sbuf_insert(sbuf_t *sp, int item)
{
P(&sp->slots); /* Wait for available slot */
P(&sp->mutex); /* Lock the buffer */
sp->buf[(++sp->rear)%(sp->n)] = item; /* Insert the item */
V(&sp->mutex); /* Unlock the buffer */
V(&sp->items); /* Announce available item */
}
/* $end sbuf_insert */
/* Remove and return the first item from buffer sp */
/* $begin sbuf_remove */
int sbuf_remove(sbuf_t *sp)
{
int item;
P(&sp->items); /* Wait for available item */
P(&sp->mutex); /* Lock the buffer */
item = sp->buf[(++sp->front)%(sp->n)]; /* Remove the item */
V(&sp->mutex); /* Unlock the buffer */
V(&sp->slots); /* Announce available slot */
return item;
}
void *thread(void *vargp)
{
Pthread_detach(pthread_self());
while (1) {
int connfd = sbuf_remove(&sbuf); /* Remove connfd from buffer */
echo_cnt(connfd); /* Service client */
Close(connfd);
}
}
客户端
#include "csapp.h"
#include<stdio.h>
#include<stdlib.h>
int wc(char *name)
{
char ch;
FILE *fp;
long count=0;
char s[21];
if ((fp=fopen("test1.txt","r+"))==NULL)
{
fprintf(stderr,"不能打开文件%s
",name);
exit(EXIT_FAILURE);
}
while(fscanf(fp,"%s",s)!=EOF)
count++;
fclose(fp);
printf("File %s has %ld characters
",name,count);
return 0;
}
int main(int argc, char **argv)
{
int clientfd, port,n,count;
char *host, buf[MAXLINE];
rio_t rio;
if (argc != 3) {
fprintf(stderr, "usage: %s <host> <port>
", argv[0]);
exit(0);
}
host = argv[1];
port = atoi(argv[2]);
clientfd = Open_clientfd(host, port);
Rio_readinitb(&rio, clientfd);
while (Fgets(buf, MAXLINE, stdin) != NULL) {
if((num=recv(sockfd,buf,MAXDATASIZE,0))==-1)
{
printf("recv() error
");
exit(1);
}
buf[num-1]=' ';
Rio_writen(clientfd, buf, strlen(buf));
Rio_readlineb(&rio, buf, MAXLINE);
Fputs(buf, stdout);
}
Close(clientfd);
exit(0);
}
/* $end echoclientmain */
/* $begin echoclientmain */
//#include "csapp.h"
/*int main(int argc, char **argv)
{
int clientfd, port;
char *host, buf[MAXLINE];
char *name;
rio_t rio;
FILE *fp;
if (argc != 4) {
fprintf(stderr, "usage: %s <host> <port> <filename>
", argv[0]);
exit(0);
}
host = argv[1];
port = atoi(argv[2]);
name = argv[3];
clientfd = Open_clientfd(host, port);
Rio_readinitb(&rio, clientfd);
fp=fopen(name,"r+");
while (Fgets(buf, MAXLINE,fp) != NULL) {
Rio_writen(clientfd, buf, strlen(buf));
Rio_readlineb(&rio, buf, MAXLINE);
Fputs(buf, stdout);
}
Close(clientfd);
exit(0);
}
新学到的知识点
更深入的理解了客户端和服务端
学习了man查询命令