/* -*- 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;
}