/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/*
 *
 *  (C) 2006 by Argonne National Laboratory.
 *      See COPYRIGHT in top-level directory.
 */
#include "mpi.h"
#include <stdio.h>
#include "mpitest.h"
#include "mpitestconf.h"

int verbose = 0;

int handlerCalled = 0;

/* Prototype to suppress compiler warnings */
void user_handler(MPI_File * fh, int *errcode, ...);

void user_handler(MPI_File * fh, int *errcode, ...)
{
    if (*errcode != MPI_SUCCESS) {
        handlerCalled++;
        if (verbose) {
            printf("In user_handler with code %d\n", *errcode);
        }
    }
}

int main(int argc, char *argv[])
{
    int rank, errs = 0, rc;
    MPI_Errhandler ioerr_handler;
    MPI_Status status;
    MPI_File fh;
    char inbuf[80];

    MTest_Init(&argc, &argv);

    MPI_Comm_rank(MPI_COMM_WORLD, &rank);

    /* Create a file to which to attach the handler */
    rc = MPI_File_open(MPI_COMM_WORLD, (char *) "/scratch/test.txt",
                       MPI_MODE_CREATE | MPI_MODE_WRONLY | MPI_MODE_DELETE_ON_CLOSE,
                       MPI_INFO_NULL, &fh);
    if (rc) {
        errs++;
        printf("Unable to open test.txt for writing\n");
    }

    rc = MPI_File_create_errhandler(user_handler, &ioerr_handler);
    if (rc) {
        errs++;
        printf("MPI_File_create_Errhandler returned an error code: %d\n", rc);
    }

    rc = MPI_File_set_errhandler(fh, ioerr_handler);
    if (rc) {
        errs++;
        printf("MPI_File_set_errhandler returned an error code: %d\n", rc);
    }

    /* avoid leaking the errhandler, safe because they have refcount semantics */
    rc = MPI_Errhandler_free(&ioerr_handler);
    if (rc) {
        errs++;
        printf("MPI_Errhandler_free returned an error code: %d\n", rc);
    }

    /* This should generate an error because the file mode is WRONLY */
    rc = MPI_File_read_at(fh, 0, inbuf, 80, MPI_BYTE, &status);
    if (handlerCalled != 1) {
        errs++;
        printf("User-defined error handler was not called\n");
    }

    rc = MPI_File_close(&fh);
    if (rc) {
        errs++;
        printf("MPI_File_close returned an error code: %d\n", rc);
    }

    MTest_Finalize(errs);
    MPI_Finalize();
    return 0;
}
