int MPI_Lookup_name(
  char *service_name,
  MPI_Info info,
  char *port_name
);

int MPI_Lookup_name(
  wchar_t *service_name,
  MPI_Info info,
  wchar_t *port_name
);

Parameters

service_name

[in] a service name (string)

info

[in] implementation-specific information (handle)

port_name

[out] a port name (string)

Remarks

This function retrieves a port_name published by MPI_PUBLISH_NAME with service_name. If service_name has not been published, it raises an error in the error class MPI_ERR_NAME. The application must supply a port_name buffer large enough to hold the largest possible port name.

If an implementation allows multiple entries with the same service_name within the same scope, a particular port_name is chosen in a way determined by the implementation.

If the info argument was used with MPI_PUBLISH_NAME to tell the implementation how to publish names, a similar info argument may be required for MPI_LOOKUP_NAME.

Thread and Interrupt Safety

This routine is thread-safe. This means that this routine may be safely used by multiple threads without the need for any user-provided thread locks. However, the routine is not interrupt safe. Typically, this is due to the use of memory allocation routines such as malloc or other non-MPICH runtime routines that are themselves not interrupt-safe.

Notes for Fortran

All MPI objects (e.g., MPI_Datatype, MPI_Comm) are of type INTEGER in Fortran.

Errors

All MPI routines (except MPI_Wtime and MPI_Wtick) return an error value; C routines as the value of the function and Fortran routines in the last argument. Before the value is returned, the current MPI error handler is called. By default, this error handler aborts the MPI job. The error handler may be changed with MPI_Comm_set_errhandler (for communicators), MPI_File_set_errhandler (for files), and MPI_Win_set_errhandler (for RMA windows). The MPI-1 routine MPI_Errhandler_set may be used but its use is deprecated. The predefined error handler MPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not guarentee that an MPI program can continue past an error; however, MPI implementations will attempt to continue whenever possible.

MPI_SUCCESS

No error; MPI routine completed successfully.

MPI_ERR_INFO

Invalid Info

MPI_ERR_OTHER

Other error; use MPI_Error_string to get more information about this error code.

MPI_ERR_ARG

Invalid argument. Some argument is invalid and is not identified by a specific error class (e.g., MPI_ERR_RANK).

Example Code

The following sample code illustrates MPI_Lookup_name.