! -*- Mode: Fortran; -*-

!

!  (C) 2014 by Argonne National Laboratory.

!      See COPYRIGHT in top-level directory.

!

       program main

       use mpi_f08

       integer errs, ierr, code(2), newerrclass, eclass

       character*(MPI_MAX_ERROR_STRING) errstring

       integer rlen

       type(MPI_Comm) comm

       integer buf(10)

       type(MPI_File) file

       type(MPI_Errhandler) myerrhan, qerr

       procedure(MPI_File_errhandler_function) myerrhanfunc

       integer callcount, codesSeen(3)

       common /myerrhan/ callcount, codesSeen

       errs = 0

       callcount = 0

       call mtest_init( ierr )

!

! Setup some new codes and classes

       call mpi_add_error_class( newerrclass, ierr )

       call mpi_add_error_code( newerrclass, code(1), ierr )

       call mpi_add_error_code( newerrclass, code(2), ierr )

       call mpi_add_error_string( newerrclass, "New Class", ierr )

       call mpi_add_error_string( code(1), "First new code", ierr )

       call mpi_add_error_string( code(2), "Second new code", ierr )

!

       call mpi_file_create_errhandler( myerrhanfunc, myerrhan, ierr )

!

! Create a new communicator so that we can leave the default errors-abort

! on MPI_COMM_WORLD.  Use this comm for file_open, just to leave a little

! more separation from comm_world

!

       call mpi_comm_dup( MPI_COMM_WORLD, comm, ierr )

       call mpi_file_open( comm, "testfile.txt", MPI_MODE_RDWR +           &

      &        MPI_MODE_CREATE, MPI_INFO_NULL, file, ierr )

       if (ierr .ne. MPI_SUCCESS) then

          errs = errs + 1

          call MTestPrintError( ierr )

       endif

!

       call mpi_file_set_errhandler( file, myerrhan, ierr )

       if (ierr .ne. MPI_SUCCESS) then

          errs = errs + 1

          call MTestPrintError( ierr )

       endif

       call mpi_file_get_errhandler( file, qerr, ierr )

       if (ierr .ne. MPI_SUCCESS) then

          errs = errs + 1

          call MTestPrintError( ierr )

       endif

       if (qerr .ne. myerrhan) then

          errs = errs + 1

          print *, ' Did not get expected error handler'

       endif

       call mpi_errhandler_free( qerr, ierr )

! We can free our error handler now

       call mpi_errhandler_free( myerrhan, ierr )

       call mpi_file_call_errhandler( file, newerrclass, ierr )

       if (ierr .ne. MPI_SUCCESS) then

          errs = errs + 1

          call MTestPrintError( ierr )

       endif

       call mpi_file_call_errhandler( file, code(1), ierr )

       if (ierr .ne. MPI_SUCCESS) then

          errs = errs + 1

          call MTestPrintError( ierr )

       endif

       call mpi_file_call_errhandler( file, code(2), ierr )

       if (ierr .ne. MPI_SUCCESS) then

          errs = errs + 1

          call MTestPrintError( ierr )

       endif

       if (callcount .ne. 3) then

          errs = errs + 1

          print *, ' Expected 3 calls to error handler, found ',  &

      &             callcount

       else

          if (codesSeen(1) .ne. newerrclass) then

             errs = errs + 1

             print *, 'Expected class ', newerrclass, ' got ',  &

      &                codesSeen(1)

          endif

          if (codesSeen(2) .ne. code(1)) then

             errs = errs + 1

             print *, 'Expected code ', code(1), ' got ',  &

      &                codesSeen(2)

          endif

          if (codesSeen(3) .ne. code(2)) then

             errs = errs + 1

             print *, 'Expected code ', code(2), ' got ',  &

      &                codesSeen(3)

          endif

       endif

       call mpi_file_close( file, ierr )

       call mpi_comm_free( comm, ierr )

       call mpi_file_delete( "testfile.txt", MPI_INFO_NULL, ierr )

!

! Check error strings while here here...

       call mpi_error_string( newerrclass, errstring, rlen, ierr )

       if (errstring(1:rlen) .ne. "New Class") then

          errs = errs + 1

          print *, ' Wrong string for error class: ', errstring(1:rlen)

       endif

       call mpi_error_class( code(1), eclass, ierr )

       if (eclass .ne. newerrclass) then

          errs = errs + 1

          print *, ' Class for new code is not correct'

       endif

       call mpi_error_string( code(1), errstring, rlen, ierr )

       if (errstring(1:rlen) .ne. "First new code") then

          errs = errs + 1

          print *, ' Wrong string for error code: ', errstring(1:rlen)

       endif

       call mpi_error_class( code(2), eclass, ierr )

       if (eclass .ne. newerrclass) then

          errs = errs + 1

          print *, ' Class for new code is not correct'

       endif

       call mpi_error_string( code(2), errstring, rlen, ierr )

       if (errstring(1:rlen) .ne. "Second new code") then

          errs = errs + 1

          print *, ' Wrong string for error code: ', errstring(1:rlen)

       endif

       call mtest_finalize( errs )

       call mpi_finalize( ierr )

       end

!

       subroutine myerrhanfunc( file, errcode )

       use mpi_f08

       type(MPI_File) file

       integer errcode

       integer rlen, ierr

       integer callcount, codesSeen(3)

       character*(MPI_MAX_ERROR_STRING) errstring

       common /myerrhan/ callcount, codesSeen

       callcount = callcount + 1

! Remember the code we've seen

       if (callcount .le. 3) then

          codesSeen(callcount) = errcode

       endif

       call mpi_error_string( errcode, errstring, rlen, ierr )

       if (ierr .ne. MPI_SUCCESS) then

          print *, ' Panic! could not get error string'

          call mpi_abort( MPI_COMM_WORLD, 1, ierr )

       endif

       end