.\" Copyright 2010 Cisco Systems, Inc.  All rights reserved.
.\" Copyright 2006-2008 Sun Microsystems, Inc.
.\" Copyright (c) 1996 Thinking Machines Corporation
.TH MPI_Error_string 3 "#OMPI_DATE#" "#PACKAGE_VERSION#" "#PACKAGE_NAME#"
.SH NAME
\fBMPI_Error_string \fP \- Returns a string for a given error code.

.SH SYNTAX
.ft R
.SH C Syntax
.nf
#include <mpi.h>
int MPI_Error_string(int \fIerrorcode\fP, char\fI *string\fP, int\fI *resultlen\fP)

.fi
.SH Fortran Syntax
.nf
INCLUDE 'mpif.h'
MPI_ERROR_STRING(\fIERRORCODE, STRING, RESULTLEN, IERROR\fP)
	INTEGER		\fIERRORCODE, RESULTLEN, IERROR\fP
	CHARACTER*(*)	\fISTRING\fP 

.fi
.SH C++ Syntax
.nf
#include <mpi.h>
void Get_error_string(int \fIerrorcode\fP, char* \fIname\fP, int& \fIresultlen\fP)

.fi
.SH INPUT PARAMETER
.ft R
.TP 1i
errorcode
Error code returned by an MPI routine or an MPI error class.

.SH OUTPUT PARAMETERS
.ft R
.TP 1i
string
Text that corresponds to the errorcode.
.TP 1i
resultlen
Length of string.
.ft R
.TP 1i
IERROR
Fortran only: Error status (integer). 

.SH DESCRIPTION
.ft R
Returns the error string associated with an error code or class. The argument string must represent storage that is at least MPI_MAX_ERROR_STRING characters long. 
.sp
The number of characters actually written is returned in the output
argument, resultlen. 

.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.  

.SH SEE ALSO
.ft R
.sp
MPI_Error_class