root/ompi/mca/io/romio321/romio/adio/ad_pfs/ad_pfs_read.c

DEFINITIONS

1. ADIOI_PFS_ReadContig

   1 /* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
   2 /* 
   3  *
   4  *   Copyright (C) 1997 University of Chicago. 
   5  *   See COPYRIGHT notice in top-level directory.
   6  */
   7 
   8 #include "ad_pfs.h"
   9 
  10 void ADIOI_PFS_ReadContig(ADIO_File fd, void *buf, int count, 
  11                      MPI_Datatype datatype, int file_ptr_type,
  12                      ADIO_Offset offset, ADIO_Status *status, int *error_code)
  13 {
  14     MPI_Count err=-1, datatype_size, len;
  15     static char myname[] = "ADIOI_PFS_READCONTIG";
  16 
  17     MPI_Type_size_x(datatype, &datatype_size);
  18     len = datatype_size * count;
  19 
  20     if (file_ptr_type == ADIO_EXPLICIT_OFFSET) {
  21         if (fd->fp_sys_posn != offset) {
  22             lseek(fd->fd_sys, offset, SEEK_SET);
  23         }
  24         err = _cread(fd->fd_sys, buf, len);
  25         fd->fp_sys_posn = offset + err;
  26         /* individual file pointer not updated */        
  27     }
  28     else {  /* read from curr. location of ind. file pointer */
  29         if (fd->fp_sys_posn != fd->fp_ind) {
  30             lseek(fd->fd_sys, fd->fp_ind, SEEK_SET);
  31         }
  32         err = _cread(fd->fd_sys, buf, len);
  33         fd->fp_ind += err; 
  34         fd->fp_sys_posn = fd->fp_ind;
  35     }         
  36 
  37 #ifdef HAVE_STATUS_SET_BYTES
  38     if (err != -1) MPIR_Status_set_bytes(status, datatype, err);
  39 #endif
  40 
  41     if (err == -1) {
  42         *error_code = MPIO_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE,
  43                                            myname, __LINE__, MPI_ERR_IO,
  44                                            "**io",
  45                                            "**io %s", strerror(errno));
  46     }
  47     else *error_code = MPI_SUCCESS;
  48 }