NAME

       MPI_Errhandler_get -  Gets the error handler for a communicator

SYNOPSIS

       int MPI_Errhandler_get(MPI_Comm comm, MPI_Errhandler *errhandler)

INPUT PARAMETERS

       comm   - communicator to get the error handler from (handle)

OUTPUT PARAMETERS

       errhandler
              - MPI error handler currently associated with communicator (handle)

THREAD AND INTERRUPT SAFETY

       This  routine is thread-safe.  This means that this routine may be safely used by multiple
       threads without the need for any user-provided thread locks.  However, the routine is  not
       interrupt  safe.   Typically, this is due to the use of memory allocation routines such as
       malloc or other non-MPICH runtime routines that are themselves not interrupt-safe.

NOTES FOR FORTRAN

       All MPI routines in Fortran (except for MPI_WTIME  and  MPI_WTICK  )  have  an  additional
       argument  ierr  at  the  end  of  the  argument list.  ierr is an integer and has the same
       meaning as the  return  value  of  the  routine  in  C.   In  Fortran,  MPI  routines  are
       subroutines, and are invoked with the call statement.

       All MPI objects (e.g., MPI_Datatype , MPI_Comm ) are of type INTEGER in Fortran.

NOTE ON IMPLEMENTATION

       The  MPI  Standard  was  unclear  on  whether  this  routine  required  the  user  to call
       MPI_Errhandler_free once for each call made to this routine in order  to  free  the  error
       handler.   After  some  debate,  the  MPI Forum added an explicit statement that users are
       required to call MPI_Errhandler_free when the return value from this routine is no  longer
       needed.   This  behavior  is  similar  to  the other MPI routines for getting objects; for
       example, MPI_Comm_group requires that the user call MPI_Group_free when the group returned
       by MPI_Comm_group is no longer needed.

ERRORS

       All  MPI  routines  (except MPI_Wtime and MPI_Wtick ) return an error value; C routines as
       the value of the function and Fortran routines in the last argument.  Before the value  is
       returned,  the current MPI error handler is called.  By default, this error handler aborts
       the MPI  job.   The  error  handler  may  be  changed  with  MPI_Comm_set_errhandler  (for
       communicators),  MPI_File_set_errhandler  (for files), and MPI_Win_set_errhandler (for RMA
       windows).  The MPI-1 routine MPI_Errhandler_set may be used but  its  use  is  deprecated.
       The  predefined  error  handler  MPI_ERRORS_RETURN may be used to cause error values to be
       returned.  Note that MPI does not guarentee that an  MPI  program  can  continue  past  an
       error; however, MPI implementations will attempt to continue whenever possible.

       MPI_SUCCESS
              - No error; MPI routine completed successfully.
       MPI_ERR_COMM
              -  Invalid  communicator.   A  common error is to use a null communicator in a call
              (not even allowed in MPI_Comm_rank ).
       MPI_ERR_ARG
              - Invalid argument.  Some argument is invalid and is not identified by  a  specific
              error class (e.g., MPI_ERR_RANK ).

                                            11/12/2016                      MPI_Errhandler_get(3)