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libs/ck-libs/ampi/romio/adio/common/ad_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 "adio.h"

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef AGGREGATION_PROFILE
#include "mpe.h"
#endif

void ADIOI_GEN_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;
    ADIO_Offset len;
    static char myname[] = "ADIOI_GEN_READCONTIG";

#ifdef AGGREGATION_PROFILE
    MPE_Log_event (5034, 0, NULL);
#endif
    MPI_Type_size(datatype, &datatype_size);
    len = (ADIO_Offset)datatype_size * (ADIO_Offset)count;
    ADIOI_Assert(len == (unsigned int) len); /* read takes an unsigned int parm */

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

    if (fd->fp_sys_posn != offset) {
#ifdef ADIOI_MPE_LOGGING
        MPE_Log_event( ADIOI_MPE_lseek_a, 0, NULL );
#endif
    err = lseek(fd->fd_sys, offset, SEEK_SET);
#ifdef ADIOI_MPE_LOGGING
        MPE_Log_event( ADIOI_MPE_lseek_b, 0, NULL );
#endif
    /* --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-- */
    }

#ifdef ADIOI_MPE_LOGGING
    MPE_Log_event( ADIOI_MPE_read_a, 0, NULL );
#endif
    err = read(fd->fd_sys, buf, (unsigned int)len);
#ifdef ADIOI_MPE_LOGGING
    MPE_Log_event( ADIOI_MPE_read_b, 0, NULL );
#endif
    /* --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;
#ifdef AGGREGATION_PROFILE
    MPE_Log_event (5035, 0, NULL);
#endif
}

---