MPIFilewriteat(3OpenMPI) MPIFilewriteat(3OpenMPI)

NAME
       MMPPIIFFiilleewwrriitteeaatt  -  Writes  a  file at an explicitly specified offset
       (blocking, noncollective).


SSYYNNTTAAXX
       C Syntax
           #include 
           int MPIFilewriteat(MPIFile fh, MPIOffset offset, void *buf,
                  int count, MPIDatatype datatype, MPIStatus *status)

       Fortran Syntax (see FORTRAN 77 NOTES)
           INCLUDE 'mpif.h'
           MPIFILEWRITEAT(FH,  OFFSET,  BUF, COUNT,
                   DATATYPE, STATUS,  IERROR)
                BUF(*)
             INTEGER FH, COUNT, DATATYPE, STATUS(MPISTATUSSIZE), IERROR
             INTEGER(KIND=MPIOFFSETKIND) OFFSET


CC++++ SSyynnttaaxx
       #include 
       void MPI::File::Writeat(MPI::Offset offset, const void* buf,
            int count, const MPI::Datatype& datatype, MPI::Status& status)

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


IINNPPUUTT PPAARRAAMMEETTEERRSS
       fh        File handle (handle).

       offset    File offset (integer).

       buf       Initial address of buffer (choice).

       count     Number of elements in buffer (integer).

       datatype  Data type of each buffer element (handle).


OOUUTTPPUUTT PPAARRAAMMEETTEERRSS
       status    Status object (status).

       IERROR    Fortran only: Error status (integer).


DESCRIPTION
       MPIFilewriteat 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. MPIFilewriteat stores the number of
       datatype elements actually written in status.  All other fields of sta-
       tus are undefined.

       It  is  erroneous to call this function if MPIMODESEQUENTIAL mode was
       specified when the file was opened.


FFOORRTTRRAANN 7777 NNOOTTEESS
       The MPI standard prescribes portable  Fortran  syntax  for  the  OFFSET
       argument  only for Fortran 90.  FORTRAN 77 users may use the non-porta-
       ble syntax

            INTEGER*MPIOFFSETKIND OFFSET

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


EERRRROORRSS
       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::ERRORSTHROWEXCEPTIONS, 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   MPIERRORSRETURN.   The   error   handler  may  be  changed  with
       MPIFileseterrhandler;     the     predefined      error      handler
       MPIERRORSAREFATAL  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
       MPIFileiwriteat
       MPIFilewriteatall
       MPIFilewriteatallbegin
       MPIFilewriteatallend




Open MPI 1.2                    September 2006     MPIFilewriteat(3OpenMPI)