root/ompi/mca/io/romio321/romio/adio/ad_piofs/ad_piofs_read.c

DEFINITIONS

1. ADIOI_PIOFS_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_piofs.h"
   9 
  10 void ADIOI_PIOFS_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 #ifndef PRINT_ERR_MSG
  16     static char myname[] = "ADIOI_PIOFS_READCONTIG";
  17 #endif
  18 
  19     MPI_Type_size_x(datatype, &datatype_size);
  20     len = datatype_size * count;
  21 
  22     if (file_ptr_type == ADIO_EXPLICIT_OFFSET) {
  23         if (fd->fp_sys_posn != offset) {
  24             llseek(fd->fd_sys, offset, SEEK_SET);
  25         }
  26         err = read(fd->fd_sys, buf, len);
  27         fd->fp_sys_posn = offset + err;
  28          /* individual file pointer not updated */        
  29     }
  30     else {  /* read from curr. location of ind. file pointer */
  31         if (fd->fp_sys_posn != fd->fp_ind) {
  32             llseek(fd->fd_sys, fd->fp_ind, SEEK_SET);
  33         }
  34         err = read(fd->fd_sys, buf, len);
  35         fd->fp_ind += err; 
  36         fd->fp_sys_posn = fd->fp_ind;
  37     }         
  38 
  39 #ifdef HAVE_STATUS_SET_BYTES
  40     if (err != -1) MPIR_Status_set_bytes(status, datatype, err);
  41 #endif
  42 
  43     if (err == -1) {
  44 #ifdef MPICH
  45         *error_code = MPIR_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE, myname, __LINE__, MPI_ERR_IO, "**io",
  46             "**io %s", strerror(errno));
  47 #elif defined(PRINT_ERR_MSG)
  48         *error_code =  MPI_ERR_UNKNOWN;
  49 #else
  50         *error_code = MPIR_Err_setmsg(MPI_ERR_IO, MPIR_ADIO_ERROR,
  51                               myname, "I/O Error", "%s", strerror(errno));
  52         ADIOI_Error(fd, *error_code, myname);       
  53 #endif
  54     }
  55     else *error_code = MPI_SUCCESS;
  56 }