client.c

#include<string.h>
#include<arpa/inet.h>
#include<stdlib.h>
#include<stdio.h>
#include<unistd.h>
#include<sys/socket.h>
#include<sys/types.h>
#include<netinet/in.h>
#include<fcntl.h>
#include<sys/stat.h>
int main()
{
	int s,r,recb,sntb,x;
	printf("INPUT port number: ");
	scanf("%d", &x);
	struct sockaddr_in server;
	char buff[50],buff2[50];
	s=socket(AF_INET,SOCK_STREAM,0);
	if(s==-1)
	{
		printf("\nSocket creation error.");
		exit(0);
	}
	printf("\nSocket created.");

	server.sin_family=AF_INET;
	server.sin_port=htons(x);
	server.sin_addr.s_addr=inet_addr("127.0.0.1");

	r=connect(s,(struct sockaddr*)&server,sizeof(server));
	if(r==-1)
	{
		printf("\nConnection error.");
		exit(0);
	}
	printf("\nSocket connected.");
	
	printf("\n\n");
	int pid;
	pid=fork();
	while(1){
	if(pid>0)
	{
		//parent
		recb=recv(s,buff,sizeof(buff),0);
		if(recb==-1)
		{
		printf("\nMessage Recieving Failed");	
		close(s);
		exit(0);
		}
	if(strcmp(buff,"BYE")==0)
		break;
	printf("\nParent - Message Recieved: ");
	printf("%s\n", buff);
	}
	else
	{
		//child
		printf("\nChild - Type Message: ");
	scanf("%s", buff2);

	sntb=send(s,buff2,sizeof(buff2),0);
	if(sntb==-1)
	{
		close(s);
		printf("\nMessage Sending Failed");
		exit(0);
	}
	if(strcmp(buff2,"BYE")==0)
		break;
	}
}

	close(s);

}