NAME

       MPI_File_seek_shared - Updates the global shared file pointer (collective).

SYNTAX

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

Fortran Syntax (see FORTRAN 77 NOTES)

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

C++ Syntax

       #include <mpi.h>
       void MPI::File::Seek_shared(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_shared updates the shared 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.

       MPI_File_seek_shared is collective; all the processes in the communicator group associated
       with  the  file  handle fh must call MPI_File_seek_shared with the same offset and whence.
       All processes in the communicator group are synchronized before the shared file pointer is
       updated.

       The  offset  can be negative, which allows seeking backwards. It is erroneous to seek to a
       negative position in the view. The end of the view is defined to be the  position  of  the
       next  elementary  data  item,  relative  to  the  current  view,  following the last whole
       elementary data item accessible.

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.