Chat application in C using named PIPES

This is a simple set of two C Programs which can act as a chat application. Basically there are two programs which need to run simultaneously. One is the client program and other the server program. This core concept used behind this is FIFO, named pipes.

Screenshots [Demo]

Client Side Chat Terminal running the client output file

Server Side Chat Terminal running the server output file

The Code
--> Receiver(Server) Side code

//client_chat
#include<stdio.h>
#include<stdlib.h>
#include<sys/stat.h>
#include<unistd.h>
#include<string.h> 
#include<linux/stat.h>
#define FIFO_FILE "MYFIFO"
int main()
{
   FILE *fp;
   char a[40];
   char readbuf[80];
   start:
      if((fp=fopen(FIFO_FILE,"r+"))==NULL)
      {
         perror("fopen");
         exit(1);
      }
      printf("Me : ");
      gets(a);
      if(a[strlen(a)-1]=='.')
      {
           fputs(a,fp);
           fclose(fp);
           return 0;
      }
      fputs(a,fp);
      fclose(fp);
      sleep(1);
      fp=fopen(FIFO_FILE,"r");
      fgets(readbuf,80,fp);
      printf("Him :%s\n",readbuf);
      fclose(fp);
      sleep(1);
      goto start;
   return 0;
}

--> Sender(Client) Side code

//server_chat
#include<stdio.h>
#include<stdlib.h>
#include<sys/stat.h>
#include<unistd.h>
#include<string.h>
#include<linux/stat.h>
#define FIFO_FILE "MYFIFO"
int main(void)
{
   FILE *fp;
   char readbuf[80],a[40];
   umask(0);
   mknod(FIFO_FILE,S_IFIFO|0666,1);
   start:
      fp=fopen(FIFO_FILE,"r");
      fgets(readbuf,80,fp);
      printf("Him :%s\n",readbuf);
      fclose(fp);
      sleep(1);
      printf("Me : ");
      gets(a);
      fp=fopen(FIFO_FILE,"r+");
      if(a[strlen(a)-1]=='.')
      {
         fputs(a,fp);
         fclose(fp);
         return 0;
       }
      fputs(a,fp);
      fclose(fp);
      sleep(1);
      goto start;
   return 0;
}

Initially you have to start the server_chat then you can start the client_chat.
End the sentence by a "." to terminate the chat !
Found Bugs, Please Comment them here :)