openmpi/ompi/mpi/man/man3/MPI_Comm_create_errhandler.3in

.\" Copyright 2009-2010 Cisco Systems, Inc.  All rights reserved.
.\" Copyright 2006-2008 Sun Microsystems, Inc.
.\" Copyright (c) 1996 Thinking Machines Corporation
.TH MPI_Comm_create_errhandler 3 "#OMPI_DATE#" "#PACKAGE_VERSION#" "#PACKAGE_NAME#"
.SH NAME
\fBMPI_Comm_create_errhandler \fP \- Creates an error handler that can be attached to communicators. 

.SH SYNTAX
.ft R
.SH C Syntax
.nf
#include <mpi.h>
int MPI_Comm_create_errhandler(MPI_Comm_errhandler_function \fI*function\fP,
	MPI_Errhandler *\fIerrhandler\fP)

.fi
.SH Fortran Syntax
.nf
INCLUDE 'mpif.h'
MPI_COMM_CREATE_ERRHANDLER(\fIFUNCTION, ERRHANDLER, IERROR\fP)
	EXTERNAL	\fIFUNCTION\fP
	INTEGER	\fIERRHANDLER, IERROR\fP

.fi
.SH C++ Syntax
.nf
#include <mpi.h>
static MPI::Errhandler
	MPI::Comm::Create_errhandler(MPI::Comm::Errhandler_function*
	\fIfunction\fP)

.fi
.SH DEPRECATED TYPE NAME NOTE
.ft R
MPI-2.2 deprecated the MPI_Comm_errhandler_fn and
MPI::Comm::Errhandler_fn types in favor of
MPI_Comm_errhandler_function and MPI::Comm::Errhandler_function,
respectively.  Open MPI supports both names (indeed, the _fn names are
typedefs to the _function names).

.SH INPUT PARAMETER
.ft R
.TP 1i
function
User-defined error handling procedure (function).

.SH OUTPUT PARAMETERS
.ft R
.TP 1i
errhandler
MPI error handler (handle).
.ft R
.TP 1i
IERROR
Fortran only: Error status (integer). 

.SH DESCRIPTION
.ft R
MPI_Comm_create_errhandler creates an error handler that can be attached to communicators. This function is identical to MPI_Errhandler_create, the use of which is deprecated. 
.sp
In C, the user routine should be a function of type MPI_Comm_errhandler_function, which is defined as 
.sp
.nf
    typedef void MPI_Comm_errhandler_function(MPI_Comm *, int *, \&...); 
.fi
.sp
The first argument is the communicator in use. The second is the error code
to be returned by the MPI routine that raised the error. This typedef replaces MPI_Handler_function, the use of which is deprecated. 
.sp
In Fortran, the user routine should be of this form:
.sp
.nf
    SUBROUTINE COMM_ERRHANDLER_FUNCTION(COMM, ERROR_CODE, \&...)
        INTEGER COMM, ERROR_CODE
.fi
.sp
In C++, the user routine should be of this form:
.sp
.nf
    typedef void MPI::Comm::Errhandler_function(MPI_Comm &, int *, \&...); 
.fi

.SH ERRORS
Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument. C++ functions do not return errors. If the default error handler is set to MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception mechanism will be used to throw an MPI::Exception object.
.sp
Before the error value is returned, the current MPI error handler is
called. By default, this error handler aborts the MPI job, except for I/O function errors. The error handler may be changed with MPI_Comm_set_errhandler; the predefined error handler MPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not guarantee that an MPI program can continue past an error.