.\" -*- nroff -*- .\" Copyright 2010 Cisco Systems, Inc. All rights reserved. .\" Copyright 2006-2008 Sun Microsystems, Inc. .\" Copyright (c) 1996 Thinking Machines Corporation .\" Copyright 2015-2016 Research Organization for Information Science .\" and Technology (RIST). All rights reserved. .\" Copyright (c) 2020 Google, LLC. All rights reserved. .\" $COPYRIGHT$ .TH MPI_File_get_group 3 "#OMPI_DATE#" "#PACKAGE_VERSION#" "#PACKAGE_NAME#" .SH NAME \fBMPI_File_get_group\fP \- Returns a duplicate of the process group of a file. .SH SYNTAX .ft R .nf .SH C Syntax .nf #include int MPI_File_get_group(MPI_File \fIfh\fP, MPI_Group \fI*group\fP) .fi .SH Fortran Syntax .nf USE MPI ! or the older form: INCLUDE 'mpif.h' MPI_FILE_GET_GROUP(\fIFH\fP, \fIGROUP\fP, \fIIERROR\fP) INTEGER \fIFH, GROUP, IERROR\fP .fi .SH Fortran 2008 Syntax .nf USE mpi_f08 MPI_File_get_group(\fIfh\fP, \fIgroup\fP, \fIierror\fP) TYPE(MPI_File), INTENT(IN) :: \fIfh\fP TYPE(MPI_Group), INTENT(OUT) :: \fIgroup\fP INTEGER, OPTIONAL, INTENT(OUT) :: \fIierror\fP .fi .SH INPUT PARAMETER .ft R .TP 1i fh File handle (handle). .SH OUTPUT PARAMETERS .TP 1i group Group that opened the file (handle). .TP 1i IERROR Fortran only: Error status (integer). .SH DESCRIPTION .ft R MPI_File_get_group returns a duplicate of the group of the communicator used to open the file associated with .I fh. The group is returned in .I group. The user is responsible for freeing .I group, using MPI_Group_free. .SH ERRORS Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument. .sp 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.