/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */

/*

 *  (C) 2001 by Argonne National Laboratory.

 *      See COPYRIGHT in top-level directory.

 */

/*

  Check that MPI_File_c2f, applied to the same object several times,

  yields the same handle.  We do this because when MPI handles in

  C are a different length than those in Fortran, care needs to

  be exercised to ensure that the mapping from one to another is unique.

  (Test added to test a potential problem in ROMIO for handling MPI_File

  on 64-bit systems)

*/

#include "mpi.h"

#include <stdio.h>

int main(int argc, char *argv[])

{

    MPI_Fint handleA, handleB;

    int rc;

    int errs = 0;

    int rank;

    MPI_File cFile;

    MPI_Init(&argc, &argv);

    MPI_Comm_rank(MPI_COMM_WORLD, &rank;;

    /* File */

    rc = MPI_File_open(MPI_COMM_WORLD, (char *) "temp",

                       MPI_MODE_RDWR | MPI_MODE_DELETE_ON_CLOSE | MPI_MODE_CREATE,

                       MPI_INFO_NULL, &cFile);

    if (rc) {

        errs++;

        printf("Unable to open file \"temp\"\n");

    }

    else {

        handleA = MPI_File_c2f(cFile);

        handleB = MPI_File_c2f(cFile);

        if (handleA != handleB) {

            errs++;

            printf("MPI_File_c2f does not give the same handle twice on the same MPI_File\n");

        }

    }

    MPI_File_close(&cFile);

    if (rank == 0) {

        if (errs) {

            fprintf(stderr, "Found %d errors\n", errs);

        }

        else {

            printf(" No Errors\n");

        }

    }

    MPI_Finalize();

    return 0;

}