MPI_FILE_GET_VIEW(3)

💅 MPI_FILE_GET_VIEW(3) — Open MPI ✨

okay so bestie, welcome to the Open MPI glow-up of MPI_FILE_GET_VIEW — this is the page that tells you how to peek at the vibe of your file, like, what's the process's whole view of the data even doing in there 🎀

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🌸 NAME 🌸

MPI_File_get_view — returns the process's view of data in the file. literally that's it, that's the whole job 🫶

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✨ SYNTAX ✨

🧚 C Syntax

#include <mpi.h>

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

🦋 Fortran Syntax

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

⭐ 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

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💜 INPUT PARAMETER 💜

• fh — file handle (handle). it's giving "your ticket to the file" energy 🎟️

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🍓 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).

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👑 DESCRIPTION 👑

so MPI_File_get_view returns the process's view of the data in the file — like, it hands you back the current state of your whole file-read aesthetic 💅

The current values of the displacement, etype, and filetype come back in disp, etype, and filetype, respectively. matching names, no chaos, we love that for us.

The MPI_File_get_view interface lets you pass a data-representation string via the datarep argument. yeah, it's a whole string, not a vibe, put it in there 🧵

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🔥 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. classic Fortran, always gotta be last 🙈

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/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.

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

• MPI_ERRORS_ARE_FATAL — causes the program to abort all connected MPI processes. like, everyone, gone, dramatic 💀
• 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. the "just tell me what went wrong, i'll handle it" icon 🫶

MPI applications can also implement their own error handlers by calling:

• MPI_Comm_create_errhandler then MPI_Comm_set_errhandler
• MPI_File_create_errhandler then MPI_File_set_errhandler
• MPI_Session_create_errhandler then MPI_Session_set_errhandler or at MPI_Session_init
• MPI_Win_create_errhandler then MPI_Win_set_errhandler

ngl bestie, note that MPI does not guarantee that an MPI program can continue past an error. so like… don't count on it, fr fr 😭

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

See the Error Handling section of the MPI-3.1 standard for more information. iykyk.

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🎀 COPYRIGHT 🎀

2003-2026, The Open MPI Community 🌈

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okay that's the whole thing, you ate that 💅✨

later bestie — this page is straight from the Open MPI fam, dated Sep 11, 2026, and it's the MPI_FILE_GET_VIEW(3) you know and love 🦋💖