Function mpi::ffi::PMPI_File_read_at

pub unsafe extern fn PMPI_File_read_at(fh: MPI_File,
                                       offset: MPI_Offset,
                                       buf: *mut c_void,
                                       count: c_int,
                                       datatype: MPI_Datatype,
                                       status: *mut MPI_Status)
                                       -> c_int