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.. _mpi_file_set_size:
MPI_File_set_size
=================
.. include_body
:ref:`MPI_File_set_size` |mdash| Resizes a file (collective).
SYNTAX
------
C Syntax
^^^^^^^^
.. code-block:: c
#include <mpi.h>
int MPI_File_set_size(MPI_File fh, MPI_Offset size)
Fortran Syntax
^^^^^^^^^^^^^^
.. code-block:: fortran
USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_FILE_SET_SIZE(FH, SIZE, IERROR)
INTEGER FH, IERROR
INTEGER(KIND=MPI_OFFSET_KIND) SIZE
Fortran 2008 Syntax
^^^^^^^^^^^^^^^^^^^
.. code-block:: fortran
USE mpi_f08
MPI_File_set_size(fh, size, ierror)
TYPE(MPI_File), INTENT(IN) :: fh
INTEGER(KIND=MPI_OFFSET_KIND), INTENT(IN) :: size
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
INPUT PARAMETERS
----------------
* ``fh``: File handle (handle).
* ``size``: Size to truncate or expand file (integer).
OUTPUT PARAMETER
----------------
* ``ierror``: Fortran only: Error status (integer).
DESCRIPTION
-----------
:ref:`MPI_File_set_size` resizes the file associated with the file handle *fh,*
truncating UNIX files as necessary. :ref:`MPI_File_set_size` is collective; all
processes in the group must pass identical values for size.
When using :ref:`MPI_File_set_size` on a UNIX file, if *size* is larger than
the current file size, the file size becomes *size*. If *size* is
smaller than the current file size, the file is truncated at the
position defined by *size* (from the beginning of the file and measured
in bytes). Regions of the file which have been previously written are
unaffected.
:ref:`MPI_File_set_size` does not affect the individual file pointers or the
shared file pointer.
Note that the actual amount of storage space cannot be allocated by
:ref:`MPI_File_set_size`. Use :ref:`MPI_File_preallocate` to accomplish this.
It is erroneous to call this function if ``MPI_MODE_SEQUENTIAL`` mode was
specified when the file was opened.
ERRORS
------
.. include:: ./ERRORS.rst
|
