c语言中socket编程实现客户机-服务器进程执行
客户端代码:c语言中socket编程实现客户机-服务器进程执行,c,sockets,client-server,C,Sockets,Client Server,客户端代码: #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <string.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <netdb.h> void error(const cha
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
void error(const char *msg)
{
perror(msg);
exit(0);
}
int main(int argc, char *argv[])
{
int sockfd, portno, n,choice;
struct sockaddr_in serv_addr;
struct hostent *server;
int buffer;
if (argc < 3)
{
fprintf(stderr,"usage %s hostname port\n", argv[0]);
exit(0);
}
portno = atoi(argv[2]);
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
error("ERROR opening socket");
server = gethostbyname(argv[1]);
if (server == NULL)
{
fprintf(stderr,"ERROR, no such host\n");
exit(0);
}
serv_addr.sin_family = AF_INET;
bcopy((char *)server->h_addr,
(char *)&serv_addr.sin_addr.s_addr,server->h_length);
serv_addr.sin_port = htons(portno);
if (connect(sockfd,(struct sockaddr *) &serv_addr,sizeof(serv_addr)) < 0)
error("ERROR connecting");
//printf("Please enter positive integer ");
printf("Enter your choice\n1=Prime number\n2=Fibonacci number\n 3=power of 2\n");
scanf("%d",&choice);
if(choice==1){
printf("Please enter positive integer ");
scanf("%d", &buffer);
}
n = write(sockfd,&buffer,sizeof(buffer));
if (n < 0)
error("ERROR writing to socket");
char msg[256];
bzero(msg, 256);
n=read(sockfd, msg, 255);
printf("%d %s\n",buffer, msg);
close(sockfd);
return 0;
}
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
void error(const char *msg)
{
perror(msg);
exit(1);
}
int prime(int num)
{
int c;
for ( c = 2 ; c <= num - 1 ; c++ )
{
if ( num%c == 0 )
{
return 0;
}
}
if ( c == num )
return 1;
return 0;
}
int main(int argc, char *argv[])
{
int sockfd, newsockfd, portno;
socklen_t clilen;
int buffer;
struct sockaddr_in serv_addr, cli_addr;
int n;
int i=1;
if (argc < 2)
{
fprintf(stderr,"ERROR, no port provided\n");
exit(1);
}
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
error("ERROR opening socket");
portno = atoi(argv[1]);
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = htons(portno);
if (bind(sockfd, (struct sockaddr *) &serv_addr,sizeof(serv_addr)) < 0)
error("ERROR on binding");
listen(sockfd,5);
clilen = sizeof(cli_addr);
newsockfd = accept(sockfd,(struct sockaddr *) &cli_addr,&clilen);
if (newsockfd < 0)
error("ERROR on accept");
n = read(newsockfd,&buffer,sizeof(buffer));
int result= prime(buffer);
if (n < 0) error("ERROR reading from socket");
printf("Client's input is: %d\n",buffer);
if(result==1)
{
n = write(newsockfd,"is Prime Number",18);
if (n < 0) error("ERROR writing to socket");
}
else
{
n = write(newsockfd,"is not Prime Number",18);
if (n < 0) error("ERROR writing to socket");
}
close(newsockfd);
close(sockfd);
return 0;
}
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无效错误(常量字符*消息)
{
佩罗尔(味精);
出口(0);
}
int main(int argc,char*argv[])
{
int sockfd,端口号,n,选项;
服务地址中的结构sockaddr\u;
结构主机*服务器;
int缓冲区;
如果(argc<3)
{
fprintf(stderr,“使用%s主机名端口,\n”,argv[0]);
出口(0);
}
portno=atoi(argv[2]);
sockfd=套接字(AF_INET,SOCK_STREAM,0);
if(sockfd<0)
错误(“打开套接字时出错”);
server=gethostbyname(argv[1]);
如果(服务器==NULL)
{
fprintf(stderr,“错误,没有这样的主机\n”);
出口(0);
}
serv_addr.sin_family=AF_INET;
b复制((字符*)服务器->h_地址,
(char*)&服务器地址sin\u addr.s\u addr,服务器->h\u长度);
serv_addr.sin_port=htons(端口号);
if(connect(sockfd,(struct sockaddr*)&serv_addr,sizeof(serv_addr))<0)
错误(“连接错误”);
//printf(“请输入正整数”);
printf(“输入您的选择\n1=素数\n2=斐波那契数\n3=2的幂\n”);
scanf(“%d”,选择(&C);
如果(选项==1){
printf(“请输入正整数”);
scanf(“%d”和缓冲区);
}
n=写入(sockfd,&buffer,sizeof(buffer));
if(n<0)
错误(“写入套接字时出错”);
char-msg[256];
bzero(msg,256);
n=读取(sockfd,msg,255);
printf(“%d%s\n”,缓冲区,消息);
关闭(sockfd);
返回0;
}
服务器代码:
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
void error(const char *msg)
{
perror(msg);
exit(0);
}
int main(int argc, char *argv[])
{
int sockfd, portno, n,choice;
struct sockaddr_in serv_addr;
struct hostent *server;
int buffer;
if (argc < 3)
{
fprintf(stderr,"usage %s hostname port\n", argv[0]);
exit(0);
}
portno = atoi(argv[2]);
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
error("ERROR opening socket");
server = gethostbyname(argv[1]);
if (server == NULL)
{
fprintf(stderr,"ERROR, no such host\n");
exit(0);
}
serv_addr.sin_family = AF_INET;
bcopy((char *)server->h_addr,
(char *)&serv_addr.sin_addr.s_addr,server->h_length);
serv_addr.sin_port = htons(portno);
if (connect(sockfd,(struct sockaddr *) &serv_addr,sizeof(serv_addr)) < 0)
error("ERROR connecting");
//printf("Please enter positive integer ");
printf("Enter your choice\n1=Prime number\n2=Fibonacci number\n 3=power of 2\n");
scanf("%d",&choice);
if(choice==1){
printf("Please enter positive integer ");
scanf("%d", &buffer);
}
n = write(sockfd,&buffer,sizeof(buffer));
if (n < 0)
error("ERROR writing to socket");
char msg[256];
bzero(msg, 256);
n=read(sockfd, msg, 255);
printf("%d %s\n",buffer, msg);
close(sockfd);
return 0;
}
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
void error(const char *msg)
{
perror(msg);
exit(1);
}
int prime(int num)
{
int c;
for ( c = 2 ; c <= num - 1 ; c++ )
{
if ( num%c == 0 )
{
return 0;
}
}
if ( c == num )
return 1;
return 0;
}
int main(int argc, char *argv[])
{
int sockfd, newsockfd, portno;
socklen_t clilen;
int buffer;
struct sockaddr_in serv_addr, cli_addr;
int n;
int i=1;
if (argc < 2)
{
fprintf(stderr,"ERROR, no port provided\n");
exit(1);
}
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
error("ERROR opening socket");
portno = atoi(argv[1]);
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = htons(portno);
if (bind(sockfd, (struct sockaddr *) &serv_addr,sizeof(serv_addr)) < 0)
error("ERROR on binding");
listen(sockfd,5);
clilen = sizeof(cli_addr);
newsockfd = accept(sockfd,(struct sockaddr *) &cli_addr,&clilen);
if (newsockfd < 0)
error("ERROR on accept");
n = read(newsockfd,&buffer,sizeof(buffer));
int result= prime(buffer);
if (n < 0) error("ERROR reading from socket");
printf("Client's input is: %d\n",buffer);
if(result==1)
{
n = write(newsockfd,"is Prime Number",18);
if (n < 0) error("ERROR writing to socket");
}
else
{
n = write(newsockfd,"is not Prime Number",18);
if (n < 0) error("ERROR writing to socket");
}
close(newsockfd);
close(sockfd);
return 0;
}
#包括
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#包括
#包括
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无效错误(常量字符*消息)
{
佩罗尔(味精);
出口(1);
}
整数素数(整数)
{
INTC;
对于(c=2;c您显然需要循环并分叉。围绕接受/读/写/关闭的无限循环将保持服务器运行
至于同时接受多个连接,您可以选择在accept
之后创建一个新进程或线程。另一个选择是使套接字不阻塞(Google是您的朋友!),并使用轮询功能,如select
或poll
查看我的此任务实现:
最基本的技巧是,您需要将accept()关闭到一个无限循环中,然后使用fork()或在接受连接后创建一个新线程
如果您不想使用my helper函数,您将在此处看到一些非常好的教程:
在服务器端
while (1){
listen(sockfd,5);
clilen = sizeof(cli_addr);
newsockfd = accept(sockfd,(struct sockaddr *) &cli_addr,&clilen);
if (newsockfd < 0)
error("ERROR on accept");
n = read(newsockfd,&buffer,sizeof(buffer));
int result= prime(buffer);
if (n < 0) error("ERROR reading from socket");
printf("Client's input is: %d\n",buffer);
if(result==1)
{
n = write(newsockfd,"is Prime Number",18);
if (n < 0) error("ERROR writing to socket");
}
else
{
n = write(newsockfd,"is not Prime Number",18);
if (n < 0) error("ERROR writing to socket");
}
}
while(1){
听(sockfd,5);
clilen=sizeof(cli_addr);
newsockfd=accept(sockfd,(struct sockaddr*)&cli\u addr,&clilen);
if(newsockfd<0)
错误(“接受错误”);
n=读取(newsockfd,&buffer,sizeof(buffer));
int result=prime(缓冲区);
如果(n<0)错误(“从套接字读取错误”);
printf(“客户端的输入为:%d\n”,缓冲区);
如果(结果==1)
{
n=写入(newsockfd,“是素数”,18);
if(n<0)错误(“写入套接字错误”);
}
其他的
{
n=写入(newsockfd,“不是素数”,18);
if(n<0)错误(“写入套接字错误”);
}
}
在客户端:
//printf("Please enter positive integer ");
while (choice != -1){
printf("Enter your choice\n1=Prime number\n2=Fibonacci number\n 3=power of 2\n");
fflush(stdin);
scanf("%d",&choice);
if(choice==1){
printf("Please enter positive integer ");
scanf("%d", &buffer);
}
n = write(sockfd,&buffer,sizeof(buffer));
if (n < 0)
error("ERROR writing to socket");
char msg[256];
bzero(msg, 256);
n=read(sockfd, msg, 255);
printf("%d %s\n",buffer, msg);
}// end of while (choice != -1){
//printf(“请输入正整数”);
while(选项!=-1){
printf(“输入您的选择\n1=素数\n2=斐波那契数\n3=2的幂\n”);
fflush(stdin);
scanf(“%d”,选择(&C);
如果(选项==1){
printf(“请输入正整数”);
scanf(“%d”和缓冲区);
}
n=写入(sockfd,&buffer,sizeof(buffer));
if(n<0)
错误(“写入套接字时出错”);
char-msg[256];
bzero(msg,256);
n=读取(sockfd,msg,255);
printf(“%d%s\n”,缓冲区,消息);
}//时间结束(选项!=-1){
在服务器端,您需要创建一个进程,也许您可以实现一个进程同步系统。关键部分,锁定资源等