.\" -*- nroff -*-
.\" Copyright 2010 Cisco Systems, Inc.  All rights reserved.
.\" Copyright 2006-2008 Sun Microsystems, Inc.
.\" Copyright (c) 1996 Thinking Machines Corporation
.\" Copyright (c) 2020      Google, LLC. All rights reserved.
.\" $COPYRIGHT$
.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
USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_ERROR_STRING(\fIERRORCODE, STRING, RESULTLEN, IERROR\fP)
	INTEGER		\fIERRORCODE, RESULTLEN, IERROR\fP
	CHARACTER*(*)	\fISTRING\fP

.fi
.SH Fortran 2008 Syntax
.nf
USE mpi_f08
MPI_Error_string(\fIerrorcode\fP, \fIstring\fP, \fIresultlen\fP, \fIierror\fP)
	INTEGER, INTENT(IN) :: \fIerrorcode\fP
	CHARACTER(LEN=MPI_MAX_ERROR_STRING), INTENT(OUT) :: \fIstring\fP
	INTEGER, INTENT(OUT) :: \fIresultlen\fP
	INTEGER, OPTIONAL, INTENT(OUT) :: \fIierror\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.
.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