18.2.113. MPI_File_get_view

MPI_File_get_view - Returns the process’s view of data in the file.

18.2.113.1. SYNTAX

18.2.113.1.1. C Syntax

#include <mpi.h>

int MPI_File_get_view(MPI_File fh, MPI_Offset *disp,
     MPI_Datatype *etype, MPI_Datatype *filetype,
     char *datarep)

18.2.113.1.2. Fortran Syntax (see FORTRAN 77 NOTES)

USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_FILE_GET_VIEW(FH, DISP, ETYPE,
     FILETYPE, DATAREP, IERROR)
     INTEGER FH, ETYPE, FILETYPE, IERROR
     CHARACTER*(*)   DATAREP
     INTEGER(KIND=MPI_OFFSET_KIND)   DISP

18.2.113.1.3. Fortran 2008 Syntax

USE mpi_f08
MPI_File_get_view(fh, disp, etype, filetype, datarep, ierror)
     TYPE(MPI_File), INTENT(IN) :: fh
     INTEGER(KIND=MPI_OFFSET_KIND), INTENT(OUT) :: disp
     TYPE(MPI_Datatype), INTENT(OUT) :: etype, filetype
     CHARACTER(LEN=*), INTENT(OUT) :: datarep
     INTEGER, OPTIONAL, INTENT(OUT) :: ierror

18.2.113.2. INPUT PARAMETER

  • fh: File handle (handle).

18.2.113.3. OUTPUT PARAMETERS

  • disp: Displacement (integer).

  • etype: Elementary data type (handle).

  • filetype: File type (handle). See Restrictions, below.

  • datarep: Data representation (string).

  • IERROR: Fortran only: Error status (integer).

18.2.113.4. DESCRIPTION

The MPI_File_get_view routine returns the process’s view of the data in the file. The current values of the displacement, etype, and filetype are returned in disp, etype, and filetype, respectively.

The MPI_File_get_view interface allows the user to pass a data-representation string via the datarep argument.

18.2.113.5. FORTRAN 77 NOTES

The MPI standard prescribes portable Fortran syntax for the DISP argument only for Fortran 90. FORTRAN 77 users may use the non-portable syntax.

INTEGER*MPI_OFFSET_KIND DISP

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

18.2.113.6. ERRORS

Almost all MPI routines return an error value; C routines as the return result of the function and Fortran routines in the last argument.

Before the error value is returned, the current MPI error handler associated with the communication object (e.g., communicator, window, file) is called. If no communication object is associated with the MPI call, then the call is considered attached to MPI_COMM_SELF and will call the associated MPI error handler. When MPI_COMM_SELF is not initialized (i.e., before MPI_INIT / MPI_INIT_THREAD, after MPI_FINALIZE, or when using the Sessions Model exclusively) the error raises the initial error handler. The initial error handler can be changed by calling MPI_COMM_SET_ERRHANDLER on MPI_COMM_SELF when using the World model, or the mpi_initial_errhandler CLI argument to mpiexec or info key to MPI_COMM_SPAWN[_MULTIPLE]. If no other appropriate error handler has been set, then the MPI_ERRORS_RETURN error handler is called for MPI I/O functions and the MPI_ERRORS_ABORT error handler is called for all other MPI functions.

In the sessions model, the error handler can be set during MPI_Session_init.

Open MPI includes three predefined error handlers that can be used:

MPI_ERRORS_ARE_FATAL: Causes the program to abort all connected MPI processes.
MPI_ERRORS_ABORT:     An error handler that can be invoked on a communicator,
                      window, file, or session. When called on a communicator, it
                      acts as if MPI_ABORT was called on that communicator. If
                      called on a window or file, acts as if MPI_ABORT was called
                      on a communicator containing the group of processes in the
                      corresponding window or file. If called on a session,
                      aborts only the local process.
MPI_ERRORS_RETURN:    Returns an error code to the application.

MPI applications can also implement their own error handlers.

Custom MPI error handlers can be created by calling: MPI_Comm_create_errhandler(3) MPI_File_create_errhandler(3) MPI_Session_create_errhandler(3) MPI_Win_create_errhandler(3)

Predefined and custom error handlers can be set by calling: MPI_Comm_set_errhandler(3) MPI_File_set_errhandler(3) MPI_Session_set_errhandler(3) MPI_Win_set_errhandler(3)

Note that MPI does not guarantee that an MPI program can continue past an error.

See the MPI man page for a full list of MPI error codes.

See the Error Handling section of the MPI-3 standard for more information.