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

/*

 *

 *  (C) 2003 by Argonne National Laboratory.

 *      See COPYRIGHT in top-level directory.

 */

#include "mpi.h"

#include <stdio.h>

#include <stdlib.h>

/*

 * This test attempts collective communication after a process in

 * the communicator has failed. Since all processes contribute to

 * the result of the operation, all process will receive an error.

 */

int main(int argc, char **argv)

{

    int rank, size, err, errclass;

    int sendbuf[1] = { 42 };

    int *recvbuf;

    MPI_Init(&argc, &argv);

    MPI_Comm_rank(MPI_COMM_WORLD, &rank;;

    MPI_Comm_size(MPI_COMM_WORLD, &size);

    MPI_Comm_set_errhandler(MPI_COMM_WORLD, MPI_ERRORS_RETURN);

    if (size < 3) {

        fprintf(stderr, "Must run with at least 3 processes\n");

        MPI_Abort(MPI_COMM_WORLD, 1);

    }

    if (rank == 1) {

        exit(EXIT_FAILURE);

    }

    recvbuf = (int *) malloc(size * sizeof(int));

    err = MPI_Gather(sendbuf, 1, MPI_INT, recvbuf, size, MPI_INT, 0, MPI_COMM_WORLD);

    if (rank == 0) {

#if defined (MPICH) && (MPICH_NUMVERSION >= 30100102)

        MPI_Error_class(err, &errclass);

        if (errclass == MPIX_ERR_PROC_FAILED) {

            printf(" No Errors\n");

            fflush(stdout);

        }

        else {

            fprintf(stderr, "Wrong error code (%d) returned. Expected MPIX_ERR_PROC_FAILED\n",

                    errclass);

        }

#else

        if (err) {

            printf(" No Errors\n");

            fflush(stdout);

        }

        else {

            fprintf(stderr, "Program reported MPI_SUCCESS, but an error code was expected.\n");

        }

#endif

    }

    free(recvbuf);

    MPI_Finalize();

    return 0;

}