NAME

       MPI_File_seek - Updates individual file pointers (noncollective).

SYNTAX

       C Syntax
           #include <mpi.h>
           int MPI_File_seek(MPI_File fh, MPI_Offset offset,
                         int whence)

Fortran Syntax (see FORTRAN 77 NOTES)

           INCLUDE 'mpif.h'
           MPI_FILE_SEEK(FH, OFFSET, WHENCE, IERROR)
                  INTEGER FH, WHENCE, IERROR
                  INTEGER(KIND=MPI_OFFSET_KIND) OFFSET

C++ Syntax

       #include <mpi.h>
       void MPI::File::Seek(MPI::Offset offset, int whence)

INPUT PARAMETERS

       fh        File handle (handle).

       offset    File offset (integer).

       whence    Update mode (integer).

OUTPUT PARAMETER

       IERROR    Fortran only: Error status (integer).

DESCRIPTION

       MPI_File_seek  updates  the  individual file pointer according to whence, which could have
       the following possible values:

         o    MPI_SEEK_SET - The pointer is set to offset.

         o    MPI_SEEK_CUR - The pointer is set to the current pointer position plus offset.

         o    MPI_SEEK_END - The pointer is set to the end of the file plus offset.

       The offset can be negative, which allows seeking backwards. It is erroneous to seek  to  a
       negative  position  in  the file. The end of the file is defined to be the location of the
       next elementary data item immediately after the last accessed  data  item,  even  if  that
       location is a hole.

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.