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libs/ck-libs/ampi/romio/adio/ad_panfs/ad_panfs_read.c

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/* -*- Mode: C; c-basic-offset:4 ; -*- */
/* 
 *
 *   Copyright (C) 1997 University of Chicago. 
 *   See COPYRIGHT notice in top-level directory.
 */

#include "ad_panfs.h"

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

void ADIOI_PANFS_ReadContig(ADIO_File fd, void *buf, int count, 
              MPI_Datatype datatype, int file_ptr_type,
              ADIO_Offset offset, ADIO_Status *status,
              int *error_code)
{
    int err = -1, datatype_size, len;
    static char myname[] = "ADIOI_PANFS_READCONTIG";

    MPI_Type_size(datatype, &datatype_size);
    len = datatype_size * count;

    if (file_ptr_type == ADIO_INDIVIDUAL) {
    offset = fd->fp_ind;
    }

    if (fd->fp_sys_posn != offset) {
    err = lseek(fd->fd_sys, offset, SEEK_SET);
    /* --BEGIN ERROR HANDLING-- */
    if (err == -1) {
        *error_code = MPIO_Err_create_code(MPI_SUCCESS,
                           MPIR_ERR_RECOVERABLE,
                           myname, __LINE__,
                           MPI_ERR_IO, "**io",
                           "**io %s", strerror(errno));
        fd->fp_sys_posn = -1;
        return;
    }
    /* --END ERROR HANDLING-- */
    }

    AD_PANFS_RETRY(read(fd->fd_sys, buf, len),err)
    /* --BEGIN ERROR HANDLING-- */
    if (err == -1) {
    *error_code = MPIO_Err_create_code(MPI_SUCCESS,
                       MPIR_ERR_RECOVERABLE,
                       myname, __LINE__,
                       MPI_ERR_IO, "**io",
                       "**io %s", strerror(errno));
    fd->fp_sys_posn = -1;
    return;
    }
    /* --END ERROR HANDLING-- */

    fd->fp_sys_posn = offset + err;

    if (file_ptr_type == ADIO_INDIVIDUAL) {
    fd->fp_ind += err; 
    }

#ifdef HAVE_STATUS_SET_BYTES
    if (err != -1) MPIR_Status_set_bytes(status, datatype, err);
#endif

    *error_code = MPI_SUCCESS;
}

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