/* -*- Mode: C; c-basic-offset:4 ; -*- */

/*

 *  (C) 2001 by Argonne National Laboratory.

 *      See COPYRIGHT in top-level directory.

 */

#include "mpi.h"

#include <stdlib.h>

#include <string.h>

#include <stdio.h>

/* tests various miscellaneous functions. */

#define VERBOSE 0

static void handle_error(int errcode, const char *str)

{

    char msg[MPI_MAX_ERROR_STRING];

    int resultlen;

    MPI_Error_string(errcode, msg, &resultlen);

    fprintf(stderr, "%s: %s\n", str, msg);

}

int main(int argc, char **argv)

{

    int buf[1024], amode, flag, mynod, len, i;

    int errs = 0, toterrs;

    MPI_File fh;

    MPI_Status status;

    MPI_Datatype newtype;

    MPI_Offset disp, offset;

    MPI_Group group;

    MPI_Datatype etype, filetype;

    char datarep[25], *filename;

    int errcode = 0;

    MPI_Init(&argc, &argv);

    MPI_Comm_rank(MPI_COMM_WORLD, &mynod);

/* process 0 takes the file name as a command-line argument and

   broadcasts it to other processes */

    if (!mynod) {

        i = 1;

        while ((i < argc) && strcmp("-fname", *argv)) {

            i++;

            argv++;

        }

        if (i >= argc) {

            fprintf(stderr, "\n*#  Usage: misc -fname filename\n\n");

            MPI_Abort(MPI_COMM_WORLD, 1);

        }

        argv++;

        len = strlen(*argv);

        filename = (char *) malloc(len + 1);

        strcpy(filename, *argv);

        MPI_Bcast(&len, 1, MPI_INT, 0, MPI_COMM_WORLD);

        MPI_Bcast(filename, len + 1, MPI_CHAR, 0, MPI_COMM_WORLD);

    } else {

        MPI_Bcast(&len, 1, MPI_INT, 0, MPI_COMM_WORLD);

        filename = (char *) malloc(len + 1);

        MPI_Bcast(filename, len + 1, MPI_CHAR, 0, MPI_COMM_WORLD);

    }

    errcode = MPI_File_open(MPI_COMM_WORLD, filename,

                            MPI_MODE_CREATE | MPI_MODE_RDWR, MPI_INFO_NULL, &fh;;

    if (errcode != MPI_SUCCESS) {

        handle_error(errcode, "MPI_File_open");

    }

    errcode = MPI_File_write(fh, buf, 1024, MPI_INT, &status);

    if (errcode != MPI_SUCCESS) {

        handle_error(errcode, "MPI_File_write");

    }

    errcode = MPI_File_sync(fh);

    if (errcode != MPI_SUCCESS) {

        handle_error(errcode, "MPI_File_sync");

    }

    errcode = MPI_File_get_amode(fh, &amode);

    if (errcode != MPI_SUCCESS) {

        handle_error(errcode, "MPI_File_get_amode");

    }

#if VERBOSE

    if (!mynod)

        fprintf(stderr, "testing MPI_File_get_amode\n");

#endif

    if (amode != (MPI_MODE_CREATE | MPI_MODE_RDWR)) {

        errs++;

        fprintf(stderr, "amode is %d, should be %d\n\n", amode, MPI_MODE_CREATE | MPI_MODE_RDWR);

    }

    errcode = MPI_File_get_atomicity(fh, &flag;;

    if (errcode != MPI_SUCCESS) {

        handle_error(errcode, "MPI_File_get_atomicity");

    }

    if (flag) {

        errs++;

        fprintf(stderr, "atomicity is %d, should be 0\n", flag);

    }

#if VERBOSE

    if (!mynod)

        fprintf(stderr, "setting atomic mode\n");

#endif

    errcode = MPI_File_set_atomicity(fh, 1);

    if (errcode != MPI_SUCCESS) {

        handle_error(errcode, "MPI_File_set_atomicity");

    }

    errcode = MPI_File_get_atomicity(fh, &flag;;

    if (errcode != MPI_SUCCESS) {

        handle_error(errcode, "MPI_File_get_atomicity");

    }

    if (!flag) {

        errs++;

        fprintf(stderr, "atomicity is %d, should be 1\n", flag);

    }

    errcode = MPI_File_set_atomicity(fh, 0);

    if (errcode != MPI_SUCCESS) {

        handle_error(errcode, "MPI_File_set_atomicity");

    }

#if VERBOSE

    if (!mynod)

        fprintf(stderr, "reverting back to nonatomic mode\n");

#endif

    MPI_Type_vector(10, 10, 20, MPI_INT, &newtype);

    MPI_Type_commit(&newtype);

    errcode = MPI_File_set_view(fh, 1000, MPI_INT, newtype, "native", MPI_INFO_NULL);

    if (errcode != MPI_SUCCESS) {

        handle_error(errcode, "MPI_File_set_view");

    }

#if VERBOSE

    if (!mynod)

        fprintf(stderr, "testing MPI_File_get_view\n");

#endif

    errcode = MPI_File_get_view(fh, &disp, &etype, &filetype, datarep);

    if (errcode != MPI_SUCCESS) {

        handle_error(errcode, "MPI_File_get_view");

    }

    if ((disp != 1000) || strcmp(datarep, "native")) {

        errs++;

        fprintf(stderr, "disp = %@LL@, datarep = %s, should be 1000, native\n\n", disp, datarep);

    }

#if VERBOSE

    if (!mynod)

        fprintf(stderr, "testing MPI_File_get_byte_offset\n");

#endif

    errcode = MPI_File_get_byte_offset(fh, 10, &disp;;

    if (errcode != MPI_SUCCESS) {

        handle_error(errcode, "MPI_File_get_byte_offset");

    }

    if (disp != (1000 + 20 * sizeof(int))) {

        errs++;

        fprintf(stderr, "byte offset = %@LL@, should be %d\n\n",

                disp, (int) (1000 + 20 * sizeof(int)));

    }

    errcode = MPI_File_get_group(fh, &group);

    if (errcode != MPI_SUCCESS) {

        handle_error(errcode, "MPI_File_get_group");

    }

#if VERBOSE

    if (!mynod)

        fprintf(stderr, "testing MPI_File_set_size\n");

#endif

    errcode = MPI_File_set_size(fh, 1000 + 15 * sizeof(int));

    if (errcode != MPI_SUCCESS) {

        handle_error(errcode, "MPI_File_set_size");

    }

    MPI_Barrier(MPI_COMM_WORLD);

    errcode = MPI_File_sync(fh);

    if (errcode != MPI_SUCCESS) {

        handle_error(errcode, "MPI_File_sync");

    }

    errcode = MPI_File_get_size(fh, &disp;;

    if (errcode != MPI_SUCCESS) {

        handle_error(errcode, "MPI_File_get_size");

    }

    if (disp != 1000 + 15 * sizeof(int)) {

        errs++;

        fprintf(stderr, "file size = %@LL@, should be %d\n\n",

                disp, (int) (1000 + 15 * sizeof(int)));

    }

#if VERBOSE

    if (!mynod)

        fprintf(stderr, "seeking to eof and testing MPI_File_get_position\n");

#endif

    errcode = MPI_File_seek(fh, 0, MPI_SEEK_END);

    if (errcode != MPI_SUCCESS) {

        handle_error(errcode, "MPI_File_seek");

    }

    errcode = MPI_File_get_position(fh, &disp;;

    if (errcode != MPI_SUCCESS) {

        handle_error(errcode, "MPI_File_get_position");

    }

    if (disp != 10) {

        errs++;

        fprintf(stderr, "file pointer posn = %@LL@, should be 10\n\n", disp);

    }

#if VERBOSE

    if (!mynod)

        fprintf(stderr, "testing MPI_File_get_byte_offset\n");

#endif

    errcode = MPI_File_get_byte_offset(fh, disp, &offset);

    if (errcode != MPI_SUCCESS) {

        handle_error(errcode, "MPI_File_get_byte_offset");

    }

    if (offset != (1000 + 20 * sizeof(int))) {

        errs++;

        fprintf(stderr, "byte offset = %@LL@, should be %d\n\n",

                offset, (int) (1000 + 20 * sizeof(int)));

    }

    MPI_Barrier(MPI_COMM_WORLD);

#if VERBOSE

    if (!mynod)

        fprintf(stderr, "testing MPI_File_seek with MPI_SEEK_CUR\n");

#endif

    errcode = MPI_File_seek(fh, -10, MPI_SEEK_CUR);

    if (errcode != MPI_SUCCESS) {

        handle_error(errcode, "MPI_File_seek");

    }

    errcode = MPI_File_get_position(fh, &disp;;

    if (errcode != MPI_SUCCESS) {

        handle_error(errcode, "MPI_File_get_position");

    }

    errcode = MPI_File_get_byte_offset(fh, disp, &offset);

    if (errcode != MPI_SUCCESS) {

        handle_error(errcode, "MPI_File_get_byte_offset");

    }

    if (offset != 1000) {

        errs++;

        fprintf(stderr, "file pointer posn in bytes = %@LL@, should be 1000\n\n", offset);

    }

#if VERBOSE

    if (!mynod)

        fprintf(stderr, "preallocating disk space up to 8192 bytes\n");

#endif

    errcode = MPI_File_preallocate(fh, 8192);

    if (errcode != MPI_SUCCESS) {

        handle_error(errcode, "MPI_File_Preallocate");

    }

#if VERBOSE

    if (!mynod)

        fprintf(stderr, "closing the file and deleting it\n");

#endif

    MPI_File_close(&fh;;

    MPI_Barrier(MPI_COMM_WORLD);

    if (!mynod)

        MPI_File_delete(filename, MPI_INFO_NULL);

    MPI_Allreduce(&errs, &toterrs, 1, MPI_INT, MPI_SUM, MPI_COMM_WORLD);

    if (mynod == 0) {

        if (toterrs > 0) {

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

        } else {

            fprintf(stdout, " No Errors\n");

        }

    }

    MPI_Type_free(&newtype);

    MPI_Type_free(&filetype);

    MPI_Group_free(&group);

    free(filename);

    MPI_Finalize();

    return 0;

}