-*- nroff -*-
Copyright 2013 Los Alamos National Security, LLC. All rights reserved.
Copyright 2010 Cisco Systems, Inc. All rights reserved.
Copyright 2006-2008 Sun Microsystems, Inc.
Copyright (c) 1996 Thinking Machines Corporation
Copyright 2015-2016 Research Organization for Information Science
and Technology (RIST). All rights reserved.
$COPYRIGHT$
MPI_File_write_at - Writes a file at an explicitly specified offset (blocking, noncollective).

 C Syntax
#include <mpi.h>
int MPI_File_write_at(MPI_File fh, MPI_Offset offset, const void *buf,
 int count, MPI_Datatype datatype, MPI_Status *status)


 Fortran Syntax (see FORTRAN 77 NOTES)
USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_FILE_WRITE_AT(FH, OFFSET, BUF, COUNT,
 DATATYPE, STATUS, IERROR)
 <type> BUF(*)
 INTEGER FH, COUNT, DATATYPE, STATUS(MPI_STATUS_SIZE), IERROR
 INTEGER(KIND=MPI_OFFSET_KIND) OFFSET


 Fortran 2008 Syntax
USE mpi_f08
MPI_File_write_at(fh, offset, buf, count, datatype, status, ierror)
 TYPE(MPI_File), INTENT(IN) :: fh
 INTEGER(KIND=MPI_OFFSET_KIND), INTENT(IN) :: offset
 TYPE(*), DIMENSION(..), INTENT(IN) :: buf
 INTEGER, INTENT(IN) :: count
 TYPE(MPI_Datatype), INTENT(IN) :: datatype
 TYPE(MPI_Status) :: status
 INTEGER, OPTIONAL, INTENT(OUT) :: ierror


 C++ Syntax
#include <mpi.h>
void MPI::File::Write_at(MPI::Offset offset, const void* buf,
 int count, const MPI::Datatype& datatype, MPI::Status& status)

void MPI::File::Write_at(MPI::Offset offset, const void* buf,
 int count, const MPI::Datatype& datatype)


 INPUT PARAMETERS
 1i
fh
File handle (handle).
 1i
offset
File offset (integer).
 1i
buf
Initial address of buffer (choice).
 1i
count
Number of elements in buffer (integer).
 1i
datatype
Data type of each buffer element (handle).

 OUTPUT PARAMETERS
 1i
status
Status object (status).
 1i
IERROR
Fortran only: Error status (integer).

 DESCRIPTION
MPI_File_write_at attempts to write into the file associated with
 fh (at the
 offset position) a total number of
 count data items having
 datatype type from 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 written into those parts of the
file specified by the current view. MPI_File_write_at stores the
number of
 datatype elements actually written 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.

 FORTRAN 77 NOTES
The MPI standard prescribes portable Fortran syntax for
the OFFSET argument only for Fortran 90. FORTRAN 77
users may use the non-portable syntax
 INTEGER*MPI_OFFSET_KIND OFFSET

where MPI_OFFSET_KIND is a constant defined in mpif.h
and gives the length of the declared integer in bytes.

 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++ functions 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. For MPI I/O function errors, the default error handler is set to MPI_ERRORS_RETURN. The error handler may be changed with MPI_File_set_errhandler; the predefined error handler MPI_ERRORS_ARE_FATAL may be used to make I/O errors fatal. Note that MPI does not guarantee that an MPI program can continue past an error.

 SEE ALSO
MPI_File_iwrite_at

MPI_File_write_at_all

MPI_File_write_at_all_begin

MPI_File_write_at_all_end