/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/*
 *
 *  (C) 2001 by Argonne National Laboratory.
 *      See COPYRIGHT in top-level directory.
 */

#include "mpiimpl.h"

/* mpiext.h contains the prototypes for functions to interface MPICH
   and ROMIO */
#include "mpiext.h"

/* -- Begin Profiling Symbol Block for routine MPI_File_get_errhandler */
#if defined(HAVE_PRAGMA_WEAK)
#pragma weak MPI_File_get_errhandler = PMPI_File_get_errhandler
#elif defined(HAVE_PRAGMA_HP_SEC_DEF)
#pragma _HP_SECONDARY_DEF PMPI_File_get_errhandler  MPI_File_get_errhandler
#elif defined(HAVE_PRAGMA_CRI_DUP)
#pragma _CRI duplicate MPI_File_get_errhandler as PMPI_File_get_errhandler
#endif
/* -- End Profiling Symbol Block */

/* Define MPICH_MPI_FROM_PMPI if weak symbols are not supported to build
   the MPI routines */
#ifndef MPICH_MPI_FROM_PMPI
#undef MPI_File_get_errhandler
#define MPI_File_get_errhandler PMPI_File_get_errhandler

#endif

#undef FUNCNAME
#define FUNCNAME MPI_File_get_errhandler

/*@
   MPI_File_get_errhandler - Get the error handler attached to a file

Input Parameters:
. file - MPI file (handle) 

Output Parameters:
. errhandler - handler currently associated with file (handle) 

.N ThreadSafeNoUpdate

.N Fortran

.N Errors
.N MPI_SUCCESS
@*/
int MPI_File_get_errhandler(MPI_File file, MPI_Errhandler *errhandler)
{
#ifdef HAVE_ERROR_CHECKING
    static const char FCNAME[] = "MPI_File_get_errhandler";
#endif
    int mpi_errno = MPI_SUCCESS;
#ifdef MPI_MODE_RDONLY
    MPI_Errhandler eh;
    MPID_Errhandler *e;
#endif
    MPID_MPI_STATE_DECL(MPID_STATE_MPI_FILE_GET_ERRHANDLER);

    MPIR_ERRTEST_INITIALIZED_ORDIE();
    
    MPIU_THREAD_CS_ENTER(ALLFUNC,);
    MPID_MPI_FUNC_ENTER(MPID_STATE_MPI_FILE_GET_ERRHANDLER);

#ifdef MPI_MODE_RDONLY
    /* Validate parameters, especially handles needing to be converted */
    /* FIXME: check for a valid file handle (fh) before converting to a pointer */
    
    /* Validate parameters and objects (post conversion) */
#   ifdef HAVE_ERROR_CHECKING
    {
        MPID_BEGIN_ERROR_CHECKS;
        {
	    MPIR_ERRTEST_ARGNULL(errhandler,"errhandler",mpi_errno);
        }
        MPID_END_ERROR_CHECKS;
    }
#   endif /* HAVE_ERROR_CHECKING */

    /* ... body of routine ...  */
    
    MPIR_ROMIO_Get_file_errhand( file, &eh );
    if (!eh) {
	MPID_Errhandler_get_ptr( MPI_ERRORS_RETURN, e );
    }
    else {
	MPID_Errhandler_get_ptr( eh, e );
    }
    MPIR_Errhandler_add_ref( e );
    *errhandler = e->handle;

#else
    /* Dummy in case ROMIO is not defined */
    mpi_errno = MPI_ERR_INTERN;
#ifdef HAVE_ERROR_CHECKING
    if (0) goto fn_fail; /* quiet compiler warning about unused label */
#endif
#endif    
    /* ... end of body of routine ... */

#ifdef HAVE_ERROR_CHECKING
  fn_exit:
#endif
    MPID_MPI_FUNC_EXIT(MPID_STATE_MPI_FILE_GET_ERRHANDLER);
    MPIU_THREAD_CS_EXIT(ALLFUNC,);
    return mpi_errno;

    /* --BEGIN ERROR HANDLING-- */
#   ifdef HAVE_ERROR_CHECKING
  fn_fail:
    {
	mpi_errno = MPIR_Err_create_code(
	    mpi_errno, MPIR_ERR_RECOVERABLE, FCNAME, __LINE__, MPI_ERR_OTHER, 
	    "**mpi_file_get_errhandler",
	    "**mpi_file_get_errhandler %F %p", file, errhandler);
    }
    /* FIXME: Is this obsolete now? */
#ifdef MPI_MODE_RDONLY
    mpi_errno = MPIO_Err_return_file( file, mpi_errno );
#endif
    goto fn_exit;
#   endif
    /* --END ERROR HANDLING-- */
}

