MPI_FILE_CALL_ERRHANDLER(3)

🎀 MPI_FILE_CALL_ERRHANDLER(3) 🎀

hi hi bestie!! this is the MPI_FILE_CALL_ERRHANDLER(3) page from Open MPI, and it's literally about handing an error code to the error handler that a file has been assigned. grab a boba, we're getting into it 🧋✨

✨ NAME ✨

MPI_File_call_errhandler — passes the supplied error code to the error handler assigned to a file. that's the whole assignment, no cap 💅

🛠️ SYNTAX 🛠️

💻 C Syntax 💻

          #include <mpi.h>

          int MPI_File_call_errhandler(MPI_File fh, int errorcode)

🧡 Fortran Syntax 🧡

          USE MPI
          ! or the older form: INCLUDE 'mpif.h'
          MPI_FILE_CALL_ERRHANDLER(FH, ERRORCODE, IERROR)
               INTEGER FH, IERRORCODE, IERROR

🦋 Fortran 2008 Syntax 🦋

          USE mpi_f08
          MPI_File_call_errhandler(fh, errorcode, ierror)
               TYPE(MPI_File), INTENT(IN) :: fh
               INTEGER, INTENT(IN) :: errorcode
               INTEGER, OPTIONAL, INTENT(OUT) :: ierror

📥 INPUT PARAMETERS 📥

• fh — file with error handler (handle). it's the file bestie in question 🗂️
• errorcode — MPI error code (integer). the actual code being passed along 🚨

📤 OUTPUT PARAMETER 📤

• ierror — Fortran only: Error status (integer). C girlies don't get this slot, it's Fortran's 💅

🌸 DESCRIPTION 🌸

okay so this function invokes the error handler assigned to the file handle fh with the supplied error code errorcode. if the error handler was successfully called, the process is not aborted, and the error handler returns, this function returns MPI_SUCCESS. periodt ✅

unlike errors on communicators and windows, the default errorhandler for files is MPI_ERRORS_RETURN. that's the plot twist, bestie 🌀

🚨 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. okay, standard behavior, we move 😌

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. dramatic, but make it real 🔥
• 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 "handle it yourself" 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

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-3.1 standard for more information. 🧠

👀 SEE ALSO 👀

• MPI_File_create_errhandler
• MPI_File_set_errhandler

📝 COPYRIGHT 📝

2003-2026, The Open MPI Community 💖

🫶 sign-off: source/version is 2003-2026, The Open MPI Community, and this page is dated Sep 11, 2026 — bye bestie, u ate! 💅✨