NAME

       MPI_Lookup_name - Finds port associated with a service name

SYNTAX

C Syntax

       #include <mpi.h>
       int MPI_Lookup_name(char *service_name, MPI_Info info,
            char *port_name)

Fortran Syntax

       INCLUDE 'mpif.h'
       MPI_LOOKUP_NAME(SERVICE_NAME, INFO, PORT_NAME, IERROR)
            CHARACTER*(*)  SERVICE_NAME, PORT_NAME
            INTEGER        INFO, IERROR

C++ Syntax

       #include <mpi.h>
       void MPI::Lookup_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).

OUTPUT PARAMETERS

       port_name     a port name (string).

       IERROR        Fortran only: Error status (integer).

DESCRIPTION

       This   function  retrieves  a  port_name  published  under  service_name  by  a  previous  invocation  of
       MPI_Publish_name. The application must supply a  port_name  buffer  large  enough  to  hold  the  largest
       possible port name (i.e., MPI_MAX_PORT_NAME bytes).

INFO ARGUMENTS

       The following keys for info are recognized:

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

       ompi_lookup_order     char *    Resolution order for name lookup.

       The  ompi_lookup_order  info  key can specify one of four valid string values (see the NAME SCOPE section
       below for more information on name scopes):

       local: Only search the local scope for name resolution.

       global: Only search the global scope for name resolution.

       local,global: Search the local scope for name resolution.  If
           not found, try searching the global scope for name resolution.  This behavior is the default  if  the
           ompi_lookup_order info key is not specified.

       global,local: Search the global scope for name resolution.  If
           not found, try searching the local scope for name resolution.

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

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_Open_port