.\" -*- nroff -*-
.\" Copyright 2010 Cisco Systems, Inc.  All rights reserved.
.\" Copyright 2007-2008 Sun Microsystems, Inc.
.\" Copyright (c) 1996 Thinking Machines Corporation
.\" Copyright (c) 2020      Google, LLC. All rights reserved.
.\" $COPYRIGHT$
.TH MPI_Open_port 3 "#OMPI_DATE#" "#PACKAGE_VERSION#" "#PACKAGE_NAME#"
.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 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.
.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