.. _mpi_file_read_at:


MPI_File_read_at
================

.. include_body

:ref:`MPI_File_read_at` |mdash| Reads a file at an explicitly specified offset
(blocking, noncollective).

.. The following file was automatically generated
.. include:: ./bindings/mpi_file_read_at.rst

INPUT PARAMETERS
----------------
* ``fh``: File handle (handle).
* ``offset``: File offset (integer).
* ``count``: Number of elements in buffer (integer).
* ``datatype``: Data type of each buffer element (handle).

OUTPUT PARAMETERS
-----------------
* ``buf``: Initial address of buffer (choice).
* ``status``: Status object (status).
* ``ierror``: Fortran only: Error status (integer).

DESCRIPTION
-----------

:ref:`MPI_File_read_at` attempts to read from the file associated with *fh* (at
the *offset* position) a total number of *count* data items having
*datatype* type into the user's buffer *buf.* The *offset* is in *etype*
units relative to the current view. That is, holes are not counted when
locating an offset. The data is taken out of those parts of the file
specified by the current view. :ref:`MPI_File_read_at` stores the number of
*datatype* elements actually read in *status.* All other fields of
*status* are undefined. It is erroneous to call this function if
``MPI_MODE_SEQUENTIAL`` mode was specified when the file was opened.


ERRORS
------

.. include:: ./ERRORS.rst