#define PIPE_ID "aa"
int Pipe_FD = 0;

int main (int argc, char **argv)
{
  printf("Waiting on openn");
  while(Pipe_FD = open(PIPE_ID, O_RDONLY) < 0) {
  }

  printf("waiting on readn");
  char ch;
  while(read(Pipe_FD, &ch, 1) > 0) {
    printf("Read: %ct", ch);
    fflush(stdout);
  }
  close(Pipe_FD);
  return 1;
}

#define PIPE_ID "aa"
int Pipe_FD = 0;

// This function configures named pipe
void configure_pipe() {
  if(mkfifo(PIPE_ID, 0666) != 0) {
    perror("mkfifo errorn");
  }
}

void writeInPipe() {
  Pipe_FD = open(PIPE_ID, O_WRONLY);
  int num;
  if((num = write(Pipe_FD, "Hi", sizeof("Hi"))) < 0) {
    perror("Error in writingt");
    exit(-1);
  }  else
    printf("Wrote bytes: %dn", num);
  close(Pipe_FD);
}

int main() {
  configure_pipe();

  writeInPipe();
  sleep(1);
  unlink(PIPE_ID);
}

Wrote bytes: 3

Waiting on open
waiting on read

Read:

        Read:

        Read:
a
        Read: a Read:
ab
        Read: a Read: b Read: