# MPI_Unpublish_name

## NAME

MPI_Unpublish_name − Unpublishes a service name

## SYNTAX

## C Syntax

#include <mpi.h>
int MPI_Unpublish_name(char *service_name, MPI_Info info,

|  | char *port_name)

## Fortran Syntax

INCLUDE ’mpif.h’
MPI_UNPUBLISH_NAME(SERVICE_NAME, INFO, PORT_NAME, IERROR)

| CHARACTER*(*) |  |  |  | SERVICE_NAME, PORT_NAME
| INTEGER |  |  |  | INFO, IERROR

## C++ Syntax

#include <mpi.h>
void MPI::Unpublish_name(const char* service_name, const MPI::Info& info,

| char* port_name)

## INPUT PARAMETERS

| service_name |  | A service name (string).
| info |  | Options to the name service functions (handle).
| port_name |  | A port name (string).

## OUTPUT PARAMETER

| IERROR |  | Fortran only: Error status (integer). |

## DESCRIPTION

This routine removes the pair (service_name, port_name) so that applications may no longer retrieve port_name by calling MPI_Lookup_name. It is an error to unpublish a service_name that was not published via MPI_Publish_name. Both the service_name and port_name arguments to MPI_Unpublish_name must be identical to the arguments to the previous call to MPI_Publish_name.

## INFO ARGUMENTS

The following keys for info are recognized:

Key Type Description
--- ---- -----------

ompi_global_scope bool If set to true, unpublish the name from
the global scope. Unpublish from the local
scope otherwise. See the NAME SCOPE
section for more details.

bool info keys are actually strings but are evaluated as follows: if the string value is a number, it is converted to an integer and cast to a boolean (meaning that zero integers are false and non-zero values are true). If the string value is (case-insensitive) "yes" or "true", the boolean is true. If the string value is (case-insensitive) "no" or "false", the boolean is false. All other string values are unrecognized, and therefore false.

If no info key is provided, the function will first check to see if a global server has been specified and is available. If so, then the unpublish function will default to global scope first, followed by local. Otherwise, the data will default to unpublish with local scope.

## NAME SCOPE

Open MPI supports two name scopes: global and local. Local scope values are placed in a data store located on the mpirun of the calling process’ job, while global scope values reside on a central server. Calls to MPI_Unpublish_name must correctly specify the scope to be used in finding the value to be removed. The function will return an error if the specified service name is not found on the indicated location.

For a more detailed description of scoping rules, please see the MPI_Publish_name man page.

## 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.

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.

See the MPI man page for a full list of MPI error codes.

## SEE ALSO

MPI_Publish_name
MPI_Lookup_name
MPI_Open_port

MPI API Index