// C program to implement one side of FIFO
// This side reads first, then reads
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

int main()
{
  int fd1;

  // FIFO file path
  char * myfifo = "/export/home/public/spiegel/cis552/demo/FIFO/myfifo";
  printf("Start wr to get the prompt\n");
  // Creating the named file(FIFO)
  // mkfifo(<pathname>,<permission>)
  mkfifo(myfifo, 0666);

  char str1[80], str2[80];
  while (1)
    {
      // First open in read only and read
      fd1 = open(myfifo,O_RDONLY);

      // printf("About to read from pipe with descriptor %d\n",fd1);
      read(fd1, str1, 80);
      // printf("Read %s from pipe with descriptor %d\n",str1,fd1);
      // Print the read string and close
      printf("User1: %s\n", str1);
      close(fd1);

      // Now open in write mode and write
      // string taken from user.
      fd1 = open(myfifo,O_WRONLY);
      printf("Enter a string of up to 80 characters\n");
      fgets(str2, 80, stdin);
      // printf("About to write %s to pipe with descriptor %d\n",str2,fd1);
      write(fd1, str2, strlen(str2)+1);
      // printf("Wrote %s to pipe with descriptor %d\n",str2,fd1);
      close(fd1);
    }
  return 0;
}