## 4.13.1. Error Handlers for Communicators

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MPI_COMM_CREATE_ERRHANDLER(function, errhandler)
IN function | user defined error handling procedure (function)
OUT errhandler | MPI error handler (handle)

`int MPI_Comm_create_errhandler(MPI_Comm_errhandler_fn *function, MPI_Errhandler *errhandler)
`

`MPI_COMM_CREATE_ERRHANDLER(FUNCTION, ERRHANDLER, IERROR)
EXTERNAL FUNCTION
INTEGER ERRHANDLER, IERROR
`

`static MPI::Errhandler MPI::Comm::Create_errhandler(MPI::Comm::Errhandler_fn* function)
`

Creates an error handler that can be attached to communicators. This function is identical to MPI_ERRHANDLER_CREATE, whose use is deprecated.

The user routine should be, in C, a function of type MPI_Comm_errhandler_fn, which is defined as

`typedef void MPI_Comm_errhandler_fn(MPI_Comm *, int *, ...);
`

The first argument is the communicator in use, the second is the error code to be returned. This typedef replaces MPI_Handler_function, whose use is deprecated.

In Fortran, the user routine should be of the form:

`SUBROUTINE COMM_ERRHANDLER_FN(COMM, ERROR_CODE, ... )
INTEGER COMM, ERROR_CODE
`

In C++, the user routine should be of the form:

`typedef void MPI::Comm::Errhandler_fn(MPI::Comm &, int *, ... );
`

MPI_COMM_SET_ERRHANDLER(comm, errhandler)
INOUT comm | communicator (handle)
IN errhandler | new error handler for communicator (handle)

`int MPI_Comm_set_errhandler(MPI_Comm comm, MPI_Errhandler errhandler)
`

`MPI_COMM_SET_ERRHANDLER(COMM, ERRHANDLER, IERROR)
INTEGER COMM, ERRHANDLER, IERROR
`

`void MPI::Comm::Set_errhandler(const MPI::Errhandler& errhandler)
`

Attaches a new error handler to a communicator. The error handler must be either a predefined error handler, or an error handler created by a call to MPI_COMM_CREATE_ERRHANDLER. This call is identical to MPI_ERRHANDLER_SET, whose use is deprecated.

MPI_COMM_GET_ERRHANDLER(comm, errhandler)
IN comm | communicator (handle)
OUT errhandler | error handler currently associated with communicator (handle)

`int MPI_Comm_get_errhandler(MPI_Comm comm, MPI_Errhandler *errhandler)
`

`MPI_COMM_GET_ERRHANDLER(COMM, ERRHANDLER, IERROR)
INTEGER COMM, ERRHANDLER, IERROR
`

`MPI::Errhandler MPI::Comm::Get_errhandler() const
`

Retrieves the error handler currently associated with a communicator. This call is identical to MPI_ERRHANDLER_GET, whose use is deprecated.

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