slide_server.c

#include<stdio.h>
#include<sys/socket.h>
#include<sys/types.h>
#include<netinet/in.h>
#include<string.h>
#include<stdlib.h>
#include<arpa/inet.h>
#define SIZE 4
int main()
{
	int sfd,lfd,len,i,j,status;
	char str[20],frame[20],temp[20],ack[20];
	struct sockaddr_in saddr,caddr;
	
	sfd=socket(AF_INET,SOCK_STREAM,0);
	if(sfd<0)
		perror("Error");
	bzero(&saddr,sizeof(saddr));
	saddr.sin_family=AF_INET;
	saddr.sin_addr.s_addr=htonl(INADDR_ANY);
	saddr.sin_port=htons(5000);
	if(bind(sfd,(struct sockaddr*)&saddr,sizeof(saddr))<0)
		perror("Bind Error");
	listen(sfd,5);
	len=sizeof(&caddr);
	lfd=accept(sfd,(struct sockaddr*)&caddr,&len);
	printf("Enter the text to send : ");
	scanf("%s",str);
	i=0;
        printf("\n\n");
 	
	while(i<strlen(str))
	{
		memset(frame,0,20);
		strncpy(frame,str+i,SIZE);
		len=strlen(frame);
		for(j=0;j<len;j++)
		{
			sprintf(temp,"%d",i+j);
			strcat(frame,temp);
		}
                printf("Frame transmitted : %s\n",frame);
		write(lfd,frame,sizeof(frame));
		read(lfd,ack,20);
		sscanf(ack,"%d",&status);

		if(status==-1)
		{
			printf("-Transmission is successful. \n");
			i = i + SIZE ;
		}	
		else
		{
			printf("-Received error in %d. \n",status);
			i = status ;
		}
		printf("\n");
	}
	
	write(lfd,"exit",sizeof("exit"));
	printf("Exiting\n");
	sleep(2);
	close(lfd);
	close(sfd);
}