text: /* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
  /*
   *  (C) 2001 by Argonne National Laboratory.
   *      See COPYRIGHT in top-level directory.
   */
  
  #include <stdio.h>
  #include "mpi.h"
  
  int main(int argc, char *argv[])
  {
      MPI_Comm intercomm;
      char str[10];
      int err, rank;
  
      MPI_Init(&argc, &argv);
  
      MPI_Comm_rank(MPI_COMM_WORLD, &rank);
  
      MPI_Comm_get_parent(&intercomm);
  
      if (rank == 3) {
          err = MPI_Send("hi", 3, MPI_CHAR, 3, 0, intercomm);
  
          err = MPI_Recv(str, 4, MPI_CHAR, 3, 0, intercomm, MPI_STATUS_IGNORE);
          printf("Child received from parent: %s\n", str);
          fflush(stdout);
      }
  
      MPI_Finalize();
      return 0;
  }
  