SOCKET USING ONE CLIENT & 1 SERVER

/MY PROGRAM ARE COMPILED IN FEDORA15 ..WITH 4.6 gcc compiler...../

HELLO I M SERVER*/

/*An implementation of client-server project for 1 client using socket*/

#include<stdio.h>

#include<stdlib.h>

#include<fcntl.h>

#include<unistd.h>

#include<linux/in.h>

#include<sys/socket.h>

int main()

{

int no1,no2,op,res=0,count=0;

int profd,fd,client_fd,ret;

socklen_t len;

len=sizeof(struct sockaddr_in);

struct sockaddr_in client_addr,server_addr,pro_addr;

server_addr.sin_family=AF_INET;

server_addr.sin_port=htons(4044);//sometimes bind returns 0...means client will be connected...but with same code ...sometimes...bind returns -1...so client will not be connected..means port is still busy..in that case...we have to wait for 5 minutes..||2 min..or any much time || we have to change the port no. to make bind successfull....

//close(fd);

server_addr.sin_addr.s_addr=inet_addr("127.0.0.1");

fd=socket(AF_INET,SOCK_STREAM,0);

printf("fd=%d\n",fd);

//strcpy(server_addr.sin_path,"sock");

ret=bind(fd,(struct sockaddr*)&server_addr,len);

printf("ret=%d\n",ret);

ret=listen(fd,6);

if(ret==0)

{

printf("queue is waiting facility for clients\n");

}

client_fd=accept(fd,(struct sockaddr*)&client_addr,&len);

printf("client_fd=%d\n",client_fd);

count=read(client_fd,&no1,4);

printf("count read frm c1=%d\n",count);

count=read(client_fd,&no2,4);

printf("count=%d\n",count);

count=read(client_fd,&op,1);

printf("count=%d\n",count);

//sleep(5);//after 5 sec...in server again i m writing from server to client...

printf("no1=%d no2=%d op=%c\n",no1,no2,op);

//write(client_fd,"hello",5);//writer will go on block..untill server writes to client again after 5 sec....means again...untill...there is no. reader ...writer will not write....||untill write does not write anything...reader will not read..MEANS reader will go on block....

//profd=socket(AF_INET,SOCK_STREAM,0);

profd=accept(fd,(struct sockaddr*)&pro_addr,&len);//copy of process socket is made here...the socket in which process has written data..that copy...of socket..that socket which is created by process...

printf("profd=%d\n",profd);//fd of a new socket for process will be retuned..

count=write(profd,&no1,4);//Means untill socket of some other system connnected to it,..||accept its request ||copy of this socket is created into other process..,,,it will not write into this socket....as

//fifo does not write untill reader is not there...but it is not stopping to read...it is reading..either no writer is there frm same fd...but if server has created a copy of this socket ...then that will not read untill...writer writes...........

printf("count write to pro1=%d\n",count);

count=write(profd,&no2,4);//write  into process_fd ...so that process may read...

printf("count write to pro1=%d\n",count);//i know writer will not write anything untill there is no reader....but writer is not standing at block ..if u have not conneted to other socket....so if u r not connected to other socket ...this fd will neither perform any function nor go on block...at point of write statement..(if u r not connected)..after that it is leaving all the statements ..either it is printf.....

count=write(profd,&op,1);

printf("count write to pro1=%d\n",count);

count=read(profd,&res,4);//frm same fd result is also read

printf("RES IN SERVER=%d\n",res);

count=write(client_fd,&res,4);//in same fd of client result is written...which will be read in client

printf("count RESULT WRITTEN TO C1 *IN SERVER*=%d\n",count);

return 0;

}

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