MPI_FILE_GET_ERRHANDLER(3)

💖 MPI_FILE_GET_ERRHANDLER 💖

okay bestie, welcome to the Open MPI manual page for MPI_File_get_errhandler — literally a whole function whose entire job is to spill the tea on which error handler is currently attached to your file. that's it. that's the function. and honestly? iconic for knowing its lane. 💅

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✨ NAME ✨

MPI_File_get_errhandler — gets the error handler for a file, bestie. that's the vibe.

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📜 SYNTAX 📜

no cap, here's how you actually call it in each language:

🍓 C Syntax

#include <mpi.h>

int MPI_File_get_errhandler(MPI_File file, MPI_Errhandler
     *errhandler)

🦋 Fortran Syntax

USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_FILE_GET_ERRHANDLER(FILE, ERRHANDLER, IERROR)
     INTEGER FILE, ERRHANDLER, IERROR

🌸 Fortran 2008 Syntax

USE mpi_f08
MPI_File_get_errhandler(file, errhandler, ierror)
     TYPE(MPI_File), INTENT(IN) :: file
     TYPE(MPI_Errhandler), INTENT(OUT) :: errhandler
     INTEGER, OPTIONAL, INTENT(OUT) :: ierror

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🎀 INPUT PARAMETER 🎀

• file — the File (handle). yeah. that one. the file handle you're curious about. 🫶

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💜 OUTPUT PARAMETERS 💜

• errhandler — the MPI error handler currently associated with file (handle). this is the gossip you came for. 👑
• ierror — Fortran only: error status (integer). only the Fortran girlies get this one.

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🔥 DESCRIPTION 🔥

so the way this works: it returns in errhandler (a handle to) the error handler that is currently associated with the file file. that's the whole thing. no plot twist. just receipts. 💅

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😭 ERRORS 😭

okay this is the long part, sit down, hydrate 💧 — 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 / 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. yeah. literally everybody. 💀
• 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 chill one. the one that lets you handle it yourself. 🌈

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

⚠️ note that MPI does not guarantee that an MPI program can continue past an error. like, it's giving maybe. it's giving we'll see. don't build your whole architecture on it, bestie. 🙈

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.

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🌟 Copyright 🌟

2003-2026, The Open MPI Community

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and that's the whole page, bestie!! 💖 you now know everything about asking a file which error handler it's currently dating. slay. this was Open MPI, page MPI_FILE_GET_ERRHANDLER(3), dated Sep 10, 2026 — shoutout to the Open MPI Community for the copyright 2003-2026, ilysm, mwah 🫶✨🎀 go forth and get those errhandlers. periodt. 👑