# MPI_Get_processor_name

Gets the name of the processor

## Synopsis

    int MPI_Get_processor_name(char *name, int *resultlen)

## Output Parameters

name
  A unique specifier for the actual (as opposed to virtual) node. This must be an array of size at least `MPI_MAX_PROCESSOR_NAME`.
resultlen
  Length (in characters) of the name

## Notes

The name returned should identify a particular piece of hardware; the exact format is implementation defined. This name may or may not be the same as might be returned by `gethostname`, `uname`, or `sysinfo`.

## 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 routines in Fortran (except for `MPI_WTIME` and `MPI_WTICK`) have an additional argument `ierr` at the end of the argument list. `ierr` is an integer and has the same meaning as the return value of the routine in C. In Fortran, MPI routines are subroutines, and are invoked with the `call` statement.

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

In Fortran, the character argument should be declared as a character string of `MPI_MAX_PROCESSOR_NAME` rather than an array of dimension `MPI_MAX_PROCESSOR_NAME`. That is,

       character*(MPI_MAX_PROCESSOR_NAME) name

rather than

       character name(MPI_MAX_PROCESSOR_NAME)

The two

The sizes of MPI strings in Fortran are one less than the sizes of that string in C/C++ because the C/C++ versions provide room for the trailing null character required by C/C++. For example, `MPI_MAX_ERROR_STRING` is `mpif.h` is one smaller than the same value in `mpi.h`. See the MPI standard, sections 2.6.2 and 4.12.9.

## 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 guarantee 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.