osx man page for mpi_comm_get_name

MPI_Comm_get_name(3OpenMPI)											       MPI_Comm_get_name(3OpenMPI)

NAME
       MPI_Comm_get_name - Returns the name that was most recently associated with a communicator.

SYNTAX
C Syntax
       #include <mpi.h>
       int MPI_Comm_get_name(MPI_Comm comm, char *comm_name, int *resultlen)

Fortran Syntax
       INCLUDE 'mpif.h'
       MPI_COMM_GET_NAME(COMM, COMM_NAME, RESULTLEN, IERROR)
	    INTEGER   COMM, RESULTLEN, IERROR
	    CHARACTER*(*) COMM_NAME

C++ Syntax
       #include <mpi.h>
       void MPI::Comm::Get_name(char* comm_name, int& resultlen) const

INPUT PARAMETER
       comm	 Communicator the name of which is to be returned (handle).

       OUTPUT PARAMETER

       comm_name Name previously stored on the communicator, or an empty string if no such name exists (string).

       resultlen Length of returned name (integer).

       IERROR	 Fortran only: Error status (integer).

DESCRIPTION
       MPI_Comm_get_name  returns the last name that was previously associated with the given communicator. The name may be set and retrieved from
       any language. The same name will be returned independent of the language used. comm_name should be allocated so that it can hold a  result-
       ing string of length MPI_MAX_OBJECT_NAME characters. MPI_Comm_get_name returns a copy of the set name in comm_name.

       If the user has not associated a name with a communicator, or an error occurs, MPI_Comm_get_name will return an empty string (all spaces in
       Fortran, "" in C and C++). The three predefined communicators will  have  predefined  names  associated	with  them.  Thus,  the  names	of
       MPI_COMM_WORLD,	MPI_COMM_SELF,	and  MPI_COMM_PARENT will have the default of MPI_COMM_WORLD, MPI_COMM_SELF, and MPI_COMM_PARENT. The fact
       that the system may have chosen to give a default name to a communicator does not prevent the user from setting a name on the same communi-
       cator; doing this removes the old name and assigns the new one.

NOTES
       It is safe simply to print the string returned by MPI_Comm_get_name, as it is always a valid string even if there was no name.

       Note  that  associating	a  name  with a communicator has no effect on the semantics of an MPI program, and will (necessarily) increase the
       store requirement of the program, since the names must be saved. Therefore, there is no requirement that users use these functions to asso-
       ciate names with communicators. However debugging and profiling MPI applications may be made easier if names are associated with communica-
       tors, since the debugger or profiler should then be able to present information in a less cryptic manner.

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++ func-
       tions  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.

Open MPI 1.2							  September 2006				       MPI_Comm_get_name(3OpenMPI)