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libs/ck-libs/ampi/romio/adio/ad_sfs/ad_sfs_fcntl.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_sfs.h"
#include "adio_extern.h"

void ADIOI_SFS_Fcntl(ADIO_File fd, int flag, ADIO_Fcntl_t *fcntl_struct, int *error_code)
{
    int  i, ntimes, len;
    ADIO_Offset curr_fsize, alloc_size, size, done;
    ADIO_Status status;
    char *buf;
#ifndef PRINT_ERR_MSG
    static char myname[] = "ADIOI_SFS_FCNTL";
#endif

    switch(flag) {
    case ADIO_FCNTL_GET_FSIZE:
        /* On SFS, I find that a write from one process, which changes
           the file size, does not automatically make the new file size 
           visible to other processes. Therefore, a sync-barrier-sync is 
           needed. (Other processes are able to read the data written 
           though; only file size is returned incorrectly.) */

    fsync(fd->fd_sys);
    MPI_Barrier(fd->comm);
    fsync(fd->fd_sys);
    
    fcntl_struct->fsize = llseek(fd->fd_sys, 0, SEEK_END);
    if (fd->fp_sys_posn != -1) 
         llseek(fd->fd_sys, fd->fp_sys_posn, SEEK_SET);
    if (fcntl_struct->fsize == -1) {
#ifdef MPICH2
        *error_code = MPIR_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE, myname, __LINE__, MPI_ERR_IO, "**io",
        "**io %s", strerror(errno));
#elif defined(PRINT_ERR_MSG)
        *error_code = MPI_ERR_UNKNOWN;
#else /* MPICH-1 */
        *error_code = MPIR_Err_setmsg(MPI_ERR_IO, MPIR_ADIO_ERROR,
                  myname, "I/O Error", "%s", strerror(errno));
        ADIOI_Error(fd, *error_code, myname);       
#endif
    }
    else *error_code = MPI_SUCCESS;
    break;

    case ADIO_FCNTL_SET_DISKSPACE:
    ADIOI_GEN_Prealloc(fd, fcntl_struct->diskspace, error_code);
    break;

    case ADIO_FCNTL_SET_ATOMICITY:
    fd->atomicity = (fcntl_struct->atomicity == 0) ? 0 : 1;
    *error_code = MPI_SUCCESS;
    break;

    default:
    FPRINTF(stderr, "Unknown flag passed to ADIOI_SFS_Fcntl\n");
    MPI_Abort(MPI_COMM_WORLD, 1);
    }
}

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