.\" -*- nroff -*-
.\" Copyright 2010 Cisco Systems, Inc.  All rights reserved.
.\" Copyright 2007-2008 Sun Microsystems, Inc.
.\" Copyright (c) 1996 Thinking Machines Corporation
.\" $COPYRIGHT$
.TH MPI_Open_port 3 "Sep 30, 2023" "4.1.6" "Open MPI"
.SH NAME
\fBMPI_Open_port\fP \- Establishes a network address for a server to accept connections from clients.

.SH SYNTAX
.ft R
.SH C Syntax
.nf
#include <mpi.h>
int MPI_Open_port(MPI_Info \fIinfo\fP, char *\fIport_name\fP)

.fi
.SH Fortran Syntax
.nf
USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_OPEN_PORT(\fIINFO, PORT_NAME, IERROR\fP)
	CHARACTER*(*)	\fIPORT_NAME\fP
	INTEGER		\fIINFO, IERROR\fP

.fi
.SH Fortran 2008 Syntax
.nf
USE mpi_f08
MPI_Open_port(\fIinfo\fP, \fIport_name\fP, \fIierror\fP)
	TYPE(MPI_Info), INTENT(IN) :: \fIinfo\fP
	CHARACTER(LEN=MPI_MAX_PORT_NAME), INTENT(OUT) :: \fIport_name\fP
	INTEGER, OPTIONAL, INTENT(OUT) :: \fIierror\fP

.fi
.SH C++ Syntax
.nf
#include <mpi.h>
void MPI::Open_port(const MPI::Info& \fIinfo\fP, char* \fIport_name\fP)

.fi
.SH INPUT PARAMETER
.ft R
.TP 1i
info
Options on how to establish an address (handle). No options currently supported.

.SH OUTPUT PARAMETERS
.ft R
.TP 1i
port_name
Newly established port (string).
.TP 1i
IERROR
Fortran only: Error status (integer).

.SH DESCRIPTION
.ft R
MPI_Open_port establishes a network address, encoded in the \fIport_name\fP string, at which the server will be able to accept connections from clients. \fIport_name\fP is supplied by the system.
.sp
MPI copies a system-supplied port name into \fIport_name\fP. \fIport_name\fP identifies the newly opened port and can be used by a client to contact the server. The maximum size string that may be supplied by the system is MPI_MAX_PORT_NAME.

.SH SUPPORTED INFO KEYS
None.

.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
MPI_Comm_accept
MPI_Comm_connect
.br