/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
/*
 * Copyright (c) 2004-2007 The Trustees of Indiana University and Indiana
 *                         University Research and Technology
 *                         Corporation.  All rights reserved.
 * Copyright (c) 2004-2005 The University of Tennessee and The University
 *                         of Tennessee Research Foundation.  All rights
 *                         reserved.
 * Copyright (c) 2004-2008 High Performance Computing Center Stuttgart, 
 *                         University of Stuttgart.  All rights reserved.
 * Copyright (c) 2004-2005 The Regents of the University of California.
 *                         All rights reserved.
 * Copyright (c) 2013 Cisco Systems, Inc.  All rights reserved.
 * Copyright (c) 2013      Los Alamos National Security, LLC.  All rights
 *                         reserved.
 * $COPYRIGHT$
 * 
 * Additional copyrights may follow
 * 
 * $HEADER$
 */

#include "ompi_config.h"

#include "ompi/mpi/c/bindings.h"
#include "ompi/runtime/params.h"
#include "ompi/communicator/communicator.h"
#include "ompi/errhandler/errhandler.h"
#include "ompi/info/info.h"
#include "ompi/file/file.h"
#include "ompi/mca/io/io.h"
#include "ompi/mca/io/base/base.h"
#include "ompi/memchecker.h"

#if OPAL_HAVE_WEAK_SYMBOLS && OMPI_PROFILING_DEFINES
#pragma weak MPI_File_open = PMPI_File_open
#endif

#if OMPI_PROFILING_DEFINES
#include "ompi/mpi/c/profile/defines.h"
#endif

static const char FUNC_NAME[] = "MPI_File_open";


int MPI_File_open(MPI_Comm comm, const char *filename, int amode,
                  MPI_Info info, MPI_File *fh)
{
    int rc;

    MEMCHECKER(
        memchecker_comm(comm);
    );

    if (MPI_PARAM_CHECK) {
        OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
        if (NULL == info || ompi_info_is_freed(info)) {
            return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_INFO,
                                          FUNC_NAME);
        } else if (ompi_comm_invalid(comm)) {
            return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_COMM,
                                          FUNC_NAME);
        }
        if (OMPI_COMM_IS_INTER(comm)) {
            return OMPI_ERRHANDLER_INVOKE (comm, MPI_ERR_COMM,
                                          FUNC_NAME);
        }
	
    }

    /* Note that MPI-2:9.7 (p265 in the ps; p261 in the pdf) says that
       errors in MPI_FILE_OPEN (before the file handle is created)
       should invoke the default error handler on MPI_FILE_NULL.
       Hence, if we get a file handle out of ompi_file_open(), invoke
       the error handler on that.  If not, invoke the error handler on
       MPI_FILE_NULL. */

    /* The io framework is only initialized lazily.  If it hasn't
       already been initialized, do so now (note that MPI_FILE_OPEN
       and MPI_FILE_DELETE are the only two places that it will be
       initialized). */

    rc = mca_base_framework_open(&ompi_io_base_framework, 0);
    if (OMPI_SUCCESS != rc) {
        return OMPI_ERRHANDLER_INVOKE(MPI_FILE_NULL, rc, FUNC_NAME);
    }

    OPAL_CR_ENTER_LIBRARY();

    /* Create an empty MPI_File handle */

    *fh = MPI_FILE_NULL;
    /* XXX -- CONST -- do not cast away const -- update mca/io */
    rc = ompi_file_open(comm, (char *) filename, amode, info, fh);

    /* Creating the file handle also selects a component to use,
       creates a module, and calls file_open() on the module.  So
       we're good to go. */

    OMPI_ERRHANDLER_RETURN(rc, *fh, rc, FUNC_NAME);
}
