/*
 * Copyright (C) by Argonne National Laboratory
 *     See COPYRIGHT in top-level directory
 */

#include "mpi.h"
#include "mpitestconf.h"
#ifdef HAVE_IOSTREAM
// Not all C++ compilers have iostream instead of iostream.h
#include <iostream>
#ifdef HAVE_NAMESPACE_STD
// Those that do often need the std namespace; otherwise, a bare "cout"
// is likely to fail to compile
using namespace std;
#endif
#else
#include <iostream.h>
#endif

#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include "mpitestcxx.h"

static int verbose = 0;

static int ncalls = 0;
void efn(MPI::File & fh, int *code, ...)
{
    ncalls++;
}

int main(int argc, char *argv[])
{
    MPI::File fh;
    MPI::Errhandler eh;
    char *filename;
    int errs = 0, toterrs, rank;
    int sawErr;

    MPI::Init();
    // Test that the default error handler is errors return for files

    filename = new char[10];
    strncpy(filename, "t1", 10);

    MPI::FILE_NULL.Set_errhandler(MPI::ERRORS_THROW_EXCEPTIONS);
    sawErr = 0;
    try {
        fh = MPI::File::Open(MPI::COMM_WORLD, filename, MPI::MODE_RDWR, MPI::INFO_NULL);
    } catch(MPI::Exception ex) {
        if (verbose)
            cout << "Caught exception from open\n";
        if (ex.Get_error_class() == MPI_SUCCESS) {
            errs++;
            cout << "Unexpected error from Open" << endl;
        }
        sawErr = 1;
    }
    if (!sawErr) {
        errs++;
        cout <<
            "Did not see error when opening a non-existent file for writing and reading (without MODE_CREATE)\n";
    }
    // Test that we can change the default error handler by changing
    // the error handler on MPI::FILE_NULL.
    eh = MPI::File::Create_errhandler(efn);
    MPI::FILE_NULL.Set_errhandler(eh);
    eh.Free();
    sawErr = 0;
    try {
        fh = MPI::File::Open(MPI::COMM_WORLD, filename, MPI::MODE_RDWR, MPI::INFO_NULL);
    }
    catch(MPI::Exception ex) {
        cout << "Caught exception from open (should have called error handler instead)\n";
        errs++;
        if (ex.Get_error_class() == MPI_SUCCESS) {
            errs++;
            cout << "Unexpected error from Open" << endl;
        }
        sawErr = 1;
    }
    if (ncalls != 1) {
        errs++;
        cout <<
            "Did not invoke error handler when opening a non-existent file for writing and reading (without MODE_CREATE)"
            << endl;
    }

    MTest_Finalize(errs);

    delete[]filename;

    return 0;
}
