MPI_File_seek(3) MPI MPI_File_seek(3)NAME
MPI_File_seek - Updates the individual file pointer
SYNOPSIS
int MPI_File_seek(MPI_File mpi_fh, MPI_Offset offset, int whence)
INPUT PARAMETERS
fh - file handle (handle)
offset - file offset (integer)
whence - update mode (state)
NOTES FOR FORTRAN
All MPI routines in Fortran (except for MPI_WTIME and MPI_WTICK ) have an additional argument ierr at the end of the argument list. ierr
is an integer and has the same meaning as the return value of the routine in C. In Fortran, MPI routines are subroutines, and are invoked
with the call statement.
All MPI objects (e.g., MPI_Datatype , MPI_Comm ) are of type INTEGER in Fortran.
LOCATION
seek.c
8/11/2010 MPI_File_seek(3)
Check Out this Related Man Page
MPI_File_seek(3OpenMPI)MPI_File_seek(3OpenMPI)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++ func-
tions 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.
Open MPI 1.2 September 2006 MPI_File_seek(3OpenMPI)
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