/* -*- 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"
#include "mpir_ext.h"

/* -- Begin Profiling Symbol Block for routine MPI_File_call_errhandler */
#if defined(HAVE_PRAGMA_WEAK)
#pragma weak MPI_File_call_errhandler = PMPI_File_call_errhandler
#elif defined(HAVE_PRAGMA_HP_SEC_DEF)
#pragma _HP_SECONDARY_DEF PMPI_File_call_errhandler  MPI_File_call_errhandler
#elif defined(HAVE_PRAGMA_CRI_DUP)
#pragma _CRI duplicate MPI_File_call_errhandler as PMPI_File_call_errhandler
#elif defined(HAVE_WEAK_ATTRIBUTE)
int MPI_File_call_errhandler(MPI_File fh, int errorcode)
    __attribute__ ((weak, alias("PMPI_File_call_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_call_errhandler
#define MPI_File_call_errhandler PMPI_File_call_errhandler

#endif

#undef FUNCNAME
#define FUNCNAME MPI_File_call_errhandler
#undef FCNAME
#define FCNAME "MPI_File_call_errhander"
/*@
   MPI_File_call_errhandler - Call the error handler installed on a
   file

Input Parameters:
+ fh - MPI file with error handler (handle)
- errorcode - error code (integer)

.N ThreadSafeNoUpdate

.N Fortran

.N Errors
.N MPI_SUCCESS
.N MPI_ERR_FILE
@*/
int MPI_File_call_errhandler(MPI_File fh, int errorcode)
{
    int mpi_errno = MPI_SUCCESS;
#ifdef MPI_MODE_RDONLY
    MPIR_Errhandler *e;
    MPI_Errhandler eh;
#endif
    MPIR_FUNC_TERSE_STATE_DECL(MPID_STATE_MPI_FILE_CALL_ERRHANDLER);

    MPIR_ERRTEST_INITIALIZED_ORDIE();

    MPIR_FUNC_TERSE_ENTER(MPID_STATE_MPI_FILE_CALL_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 */

    /* ... body of routine ...  */

    MPIR_ROMIO_Get_file_errhand(fh, &eh);
    /* Check for the special case of errors-throw-exception.  In this case
     * return the error code; the C++ wrapper will cause an exception to
     * be thrown.
     */
#ifdef HAVE_CXX_BINDING
    if (eh == MPIR_ERRORS_THROW_EXCEPTIONS) {
        mpi_errno = errorcode;
        goto fn_exit;
    }
#endif
    if (!eh) {
        MPIR_Errhandler_get_ptr(MPI_ERRORS_RETURN, e);
    } else {
        MPIR_Errhandler_get_ptr(eh, e);
    }

    /* Note that, unlike the rest of MPICH, MPI_File objects are pointers,
     * not integers.  */

    if (e->handle == MPI_ERRORS_RETURN) {
        goto fn_exit;
    }

    if (e->handle == MPI_ERRORS_ARE_FATAL) {
        MPIR_Handle_fatal_error(NULL, "MPI_File_call_errhandler", errorcode);
    }

    switch (e->language) {
        case MPIR_LANG__C:
            (*e->errfn.C_File_Handler_function) (&fh, &errorcode);
            break;
#ifdef HAVE_CXX_BINDING
        case MPIR_LANG__CXX:
            /* See HAVE_LANGUAGE_FORTRAN below for an explanation */
            {
                void *fh1 = (void *) &fh;
                (*MPIR_Process.cxx_call_errfn) (1, fh1, &errorcode,
                                                (void (*)(void)) *e->errfn.C_File_Handler_function);
            }
            break;
#endif
#ifdef HAVE_FORTRAN_BINDING
        case MPIR_LANG__FORTRAN90:
        case MPIR_LANG__FORTRAN:
            /* The assignemt to a local variable prevents the compiler
             * from generating a warning about a type-punned pointer.  Since
             * the value is really const (but MPI didn't define error handlers
             * with const), this preserves the intent */
            {
                void *fh1 = (void *) &fh;
                MPI_Fint ferr = errorcode;      /* Needed if MPI_Fint and int aren't
                                                 * the same size */
                (*e->errfn.F77_Handler_function) (fh1, &ferr);
            }
            break;
#endif
    }

#else
    /* Dummy in case ROMIO is not defined */
    mpi_errno = MPI_ERR_INTERN;
#endif
    /* ... end of body of routine ... */

#if defined(HAVE_CXX_BINDING) && defined(MPI_MODE_RDONLY)
  fn_exit:
#else
  fn_exit:
#endif
    MPIR_FUNC_TERSE_EXIT(MPID_STATE_MPI_FILE_CALL_ERRHANDLER);
    return mpi_errno;
}

#ifndef MPICH_MPI_FROM_PMPI
/* This is a glue routine that can be used by ROMIO
   (see mpi-io/glue/mpich/mpio_err.c) to properly invoke the C++
   error handler */
#undef FUNCNAME
#define FUNCNAME MPIR_File_call_cxx_errhandler
#undef FCNAME
#define FCNAME MPL_QUOTE(FUNCNAME)
int MPIR_File_call_cxx_errhandler(MPI_File * fh, int *errorcode,
                                  void (*c_errhandler) (MPI_File *, int *, ...))
{
    /* ROMIO will contain a reference to this routine, so if there is
     * no C++ support, it will never be called but it must be availavle. */
#ifdef HAVE_CXX_BINDING
    void *fh1 = (void *) fh;
    (*MPIR_Process.cxx_call_errfn) (1, fh1, errorcode, (void (*)(void)) c_errhandler);
    /* The C++ code throws an exception if the error handler
     * returns something other than MPI_SUCCESS. There is no "return"
     * of an error code. This code mirrors that in errutil.c */
    *errorcode = MPI_SUCCESS;
#endif
    return *errorcode;
}
#endif