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H5FDlog.c

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by the Board of Trustees of the University of Illinois.         *
 * All rights reserved.                                                      *
 *                                                                           *
 * This file is part of HDF5.  The full HDF5 copyright notice, including     *
 * terms governing use, modification, and redistribution, is contained in    *
 * the files COPYING and Copyright.html.  COPYING can be found at the root   *
 * of the source code distribution tree; Copyright.html can be found at the  *
 * root level of an installed copy of the electronic HDF5 document set and   *
 * is linked from the top-level documents page.  It can also be found at     *
 * http://hdf.ncsa.uiuc.edu/HDF5/doc/Copyright.html.  If you do not have     *
 * access to either file, you may request a copy from hdfhelp@ncsa.uiuc.edu. *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*
 * Programmer:  Quincey Koziol <koziol@ncsa.uiuc.edu>
 *              Monday, April 17, 2000
 *
 * Purpose: The POSIX unbuffered file driver using only the HDF5 public
 *          API and with a few optimizations: the lseek() call is made
 *          only when the current file position is unknown or needs to be
 *          changed based on previous I/O through this driver (don't mix
 *          I/O from this driver with I/O from other parts of the
 *          application to the same file).
 *          With custom modifications...
 */

#include "H5private.h"        /*library functions                 */
#include "H5Eprivate.h"       /*error handling              */
#include "H5Fprivate.h"       /*files                             */
#include "H5FDprivate.h"      /*file driver                         */
#include "H5FDlog.h"            /* logging file driver */
#include "H5FLprivate.h"      /*Free Lists        */
#include "H5Iprivate.h"       /*object IDs                          */
#include "H5MMprivate.h"        /* Memory allocation */
#include "H5Pprivate.h"       /*property lists              */

#ifdef MAX
#undef MAX
#define MAX(X,Y)  ((X)>(Y)?(X):(Y))
#endif /* MAX */

/* The driver identification number, initialized at runtime */
static hid_t H5FD_LOG_g = 0;

/* File operations */
#define OP_UNKNOWN      0
#define OP_READ         1
#define OP_WRITE  2

/* Driver-specific file access properties */
typedef struct H5FD_log_fapl_t {
    char *logfile;              /* Allocated log file name */
    unsigned flags;             /* Flags for logging behavior */
    size_t buf_size;            /* Size of buffers for track flavor and number of times each byte is accessed */
} H5FD_log_fapl_t;

/* Define strings for the different file memory types */
static const char *flavors[]={   /* These are defined in H5FDpublic.h */
    "H5FD_MEM_DEFAULT",
    "H5FD_MEM_SUPER",
    "H5FD_MEM_BTREE",
    "H5FD_MEM_DRAW",
    "H5FD_MEM_GHEAP",
    "H5FD_MEM_LHEAP",
    "H5FD_MEM_OHDR",
};

/*
 * The description of a file belonging to this driver. The `eoa' and `eof'
 * determine the amount of hdf5 address space in use and the high-water mark
 * of the file (the current size of the underlying Unix file). The `pos'
 * value is used to eliminate file position updates when they would be a
 * no-op. Unfortunately we've found systems that use separate file position
 * indicators for reading and writing so the lseek can only be eliminated if
 * the current operation is the same as the previous operation.  When opening
 * a file the `eof' will be set to the current file size, `eoa' will be set
 * to zero, `pos' will be set to H5F_ADDR_UNDEF (as it is when an error
 * occurs), and `op' will be set to H5F_OP_UNKNOWN.
 */
typedef struct H5FD_log_t {
    H5FD_t  pub;              /*public stuff, must be first */
    int           fd;               /*the unix file               */
    haddr_t eoa;              /*end of allocated region     */
    haddr_t eof;              /*end of file; current file size*/
    haddr_t pos;              /*current file I/O position   */
    int           op;                   /*last operation          */
    unsigned char *nread;   /* Number of reads from a file location */
    unsigned char *nwrite;  /* Number of write to a file location */
    unsigned char *flavor;  /* Flavor of information written to file location */
    size_t  iosize;         /* Size of I/O information buffers */
    FILE   *logfp;          /* Log file pointer */
    H5FD_log_fapl_t fa; /*driver-specific file access properties*/
#ifndef WIN32
    /*
     * On most systems the combination of device and i-node number uniquely
     * identify a file.
     */
    dev_t   device;                 /*file device number          */
    ino_t   inode;                  /*file i-node number          */
#else
    /*
     * On WIN32 the low-order word of a unique identifier associated with the
     * file and the volume serial number uniquely identify a file. This number
     * (which, both? -rpm) may change when the system is restarted or when the
     * file is opened. After a process opens a file, the identifier is
     * constant until the file is closed. An application can use this
     * identifier and the volume serial number to determine whether two
     * handles refer to the same file.
     */
    int fileindexlo;
    int fileindexhi;
#endif
} H5FD_log_t;


/*
 * This driver supports systems that have the lseek64() function by defining
 * some macros here so we don't have to have conditional compilations later
 * throughout the code.
 *
 * file_offset_t: The datatype for file offsets, the second argument of
 *                the lseek() or lseek64() call.
 *
 * file_seek:           The function which adjusts the current file position,
 *                either lseek() or lseek64().
 */
/* adding for windows NT file system support. */

#ifdef H5_HAVE_LSEEK64
#   define file_offset_t      off64_t
#   define file_seek          lseek64
#elif defined (WIN32)
#   ifdef __MWERKS__
#       define file_offset_t off_t
#       define file_seek lseek
#   else /*MSVC*/
#       define file_offset_t __int64
#       define file_seek _lseeki64
#   endif
#else
#   define file_offset_t      off_t
#   define file_seek          lseek
#endif


/*
 * These macros check for overflow of various quantities.  These macros
 * assume that file_offset_t is signed and haddr_t and size_t are unsigned.
 * 
 * ADDR_OVERFLOW: Checks whether a file address of type `haddr_t'
 *                is too large to be represented by the second argument
 *                of the file seek function.
 *
 * SIZE_OVERFLOW: Checks whether a buffer size of type `hsize_t' is too
 *                large to be represented by the `size_t' type.
 *
 * REGION_OVERFLOW:     Checks whether an address and size pair describe data
 *                which can be addressed entirely by the second
 *                argument of the file seek function.
 */
#define MAXADDR (((haddr_t)1<<(8*sizeof(file_offset_t)-1))-1)
#define ADDR_OVERFLOW(A)      (HADDR_UNDEF==(A) ||                      \
                         ((A) & ~(haddr_t)MAXADDR))
#define SIZE_OVERFLOW(Z)      ((Z) & ~(hsize_t)MAXADDR)
#define REGION_OVERFLOW(A,Z)  (ADDR_OVERFLOW(A) || SIZE_OVERFLOW(Z) ||      \
                         sizeof(file_offset_t)<sizeof(size_t) ||      \
                                 HADDR_UNDEF==(A)+(Z) ||                \
                         (file_offset_t)((A)+(Z))<(file_offset_t)(A))

/* Prototypes */
static void *H5FD_log_fapl_get(H5FD_t *file);
static void *H5FD_log_fapl_copy(const void *_old_fa);
static herr_t H5FD_log_fapl_free(void *_fa);
static H5FD_t *H5FD_log_open(const char *name, unsigned flags, hid_t fapl_id,
                        haddr_t maxaddr);
static herr_t H5FD_log_close(H5FD_t *_file);
static int H5FD_log_cmp(const H5FD_t *_f1, const H5FD_t *_f2);
static herr_t H5FD_log_query(const H5FD_t *_f1, unsigned long *flags);
static haddr_t H5FD_log_alloc(H5FD_t *_file, H5FD_mem_t type, hid_t dxpl_id, hsize_t size);
static haddr_t H5FD_log_get_eoa(H5FD_t *_file);
static herr_t H5FD_log_set_eoa(H5FD_t *_file, haddr_t addr);
static haddr_t H5FD_log_get_eof(H5FD_t *_file);
static herr_t  H5FD_log_get_handle(H5FD_t *_file, hid_t fapl, void** file_handle);
static herr_t H5FD_log_read(H5FD_t *_file, H5FD_mem_t type, hid_t fapl_id, haddr_t addr,
                       size_t size, void *buf);
static herr_t H5FD_log_write(H5FD_t *_file, H5FD_mem_t type, hid_t fapl_id, haddr_t addr,
                        size_t size, const void *buf);
static herr_t H5FD_log_flush(H5FD_t *_file, hid_t dxpl_id, unsigned closing);

/*
 * The free list map which causes each request type to use no free lists
 */
#define H5FD_FLMAP_NOLIST {                                       \
    H5FD_MEM_NOLIST,                /*default*/                   \
    H5FD_MEM_NOLIST,                /*super*/                     \
    H5FD_MEM_NOLIST,                /*btree*/                     \
    H5FD_MEM_NOLIST,                /*draw*/                      \
    H5FD_MEM_NOLIST,                /*gheap*/                     \
    H5FD_MEM_NOLIST,                /*lheap*/                     \
    H5FD_MEM_NOLIST                 /*ohdr*/                      \
}

static const H5FD_class_t H5FD_log_g = {
    "log",                          /*name                  */
    MAXADDR,                              /*maxaddr         */
    H5F_CLOSE_WEAK,                       /* fc_degree            */
    NULL,                           /*sb_size         */
    NULL,                           /*sb_encode       */
    NULL,                           /*sb_decode       */
    sizeof(H5FD_log_fapl_t),                    /*fapl_size       */
    H5FD_log_fapl_get,                        /*fapl_get          */
    H5FD_log_fapl_copy,                       /*fapl_copy         */
    H5FD_log_fapl_free,                       /*fapl_free         */
    0,                                    /*dxpl_size       */
    NULL,                           /*dxpl_copy       */
    NULL,                           /*dxpl_free       */
    H5FD_log_open,                        /*open                  */
    H5FD_log_close,                       /*close                 */
    H5FD_log_cmp,                   /*cmp             */
    H5FD_log_query,                       /*query                 */
    H5FD_log_alloc,                       /*alloc                 */
    NULL,                           /*free                  */
    H5FD_log_get_eoa,                     /*get_eoa         */
    H5FD_log_set_eoa,                     /*set_eoa         */
    H5FD_log_get_eof,                     /*get_eof         */
    H5FD_log_get_handle,                        /*get_handle            */
    H5FD_log_read,                        /*read                  */
    H5FD_log_write,                       /*write                 */
    H5FD_log_flush,                       /*flush                 */
    NULL,                                       /*lock                  */
    NULL,                                       /*unlock                */
    H5FD_FLMAP_NOLIST                     /*fl_map          */
};

/* Interface initialization */
#define PABLO_MASK      H5FD_log_mask
#define INTERFACE_INIT  H5FD_log_init
static int interface_initialize_g = 0;


/*-------------------------------------------------------------------------
 * Function:      H5FD_log_init
 *
 * Purpose: Initialize this driver by registering the driver with the
 *          library.
 *
 * Return:  Success:    The driver ID for the log driver.
 *
 *          Failure:    Negative.
 *
 * Programmer:    Robb Matzke
 *              Thursday, July 29, 1999
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5FD_log_init(void)
{
    hid_t ret_value=H5FD_LOG_g;         /* Return value */

    FUNC_ENTER_NOAPI(H5FD_log_init, FAIL);

    if (H5I_VFL!=H5Iget_type(H5FD_LOG_g))
        H5FD_LOG_g = H5FDregister(&H5FD_log_g);

    /* Set return value */
    ret_value=H5FD_LOG_g;

done:
    FUNC_LEAVE_NOAPI(ret_value);
}

#ifdef H5_WANT_H5_V1_4_COMPAT

/*-------------------------------------------------------------------------
 * Function:      H5Pset_fapl_log
 *
 * Purpose: Modify the file access property list to use the H5FD_LOG
 *          driver defined in this source file.  There are no driver
 *          specific properties.
 *          
 * Return:  Non-negative on success/Negative on failure
 *
 * Programmer:    Robb Matzke
 *          Thursday, February 19, 1998
 *
 * Modifications:
 *              We copy the LOGFILE value into our own access properties.
 *
 *          Raymond Lu, 2001-10-25
 *          Changed the file access list to the new generic property list.
 *    
 *-------------------------------------------------------------------------
 */
herr_t
H5Pset_fapl_log(hid_t fapl_id, const char *logfile, int verbosity)
{
    H5FD_log_fapl_t     fa;     /* File access property list information */
    H5P_genplist_t *plist;      /* Property list pointer */
    herr_t ret_value;

    FUNC_ENTER_API(H5Pset_fapl_log, FAIL);
    H5TRACE3("e","isIs",fapl_id,logfile,verbosity);
    
    if(NULL == (plist = H5P_object_verify(fapl_id,H5P_FILE_ACCESS)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file access property list");

    fa.logfile=logfile;
    if(verbosity>0) {
        fa.flags=H5FD_LOG_LOC_IO|H5FD_LOG_FLAVOR;
        if(verbosity>1)
            fa.flags|=H5FD_LOG_FILE_IO;
    } /* end if */
    fa.buf_size=32*(1024*1024);
    ret_value= H5P_set_driver(plist, H5FD_LOG, &fa);

done:
    FUNC_LEAVE_API(ret_value);
}
#else /* H5_WANT_H5_V1_4_COMPAT */

/*-------------------------------------------------------------------------
 * Function:      H5Pset_fapl_log
 *
 * Purpose: Modify the file access property list to use the H5FD_LOG
 *          driver defined in this source file.  There are no driver
 *          specific properties.
 *          
 * Return:  Non-negative on success/Negative on failure
 *
 * Programmer:    Robb Matzke
 *          Thursday, February 19, 1998
 *
 * Modifications:
 *              We copy the LOGFILE value into our own access properties.
 *
 *          Raymond Lu, 2001-10-25
 *          Changed the file access list to the new generic property list.
 *    
 *-------------------------------------------------------------------------
 */
herr_t
H5Pset_fapl_log(hid_t fapl_id, const char *logfile, unsigned flags, size_t buf_size)
{
    H5FD_log_fapl_t     fa;     /* File access property list information */
    H5P_genplist_t *plist;      /* Property list pointer */
    herr_t ret_value;

    FUNC_ENTER_API(H5Pset_fapl_log, FAIL);
    H5TRACE4("e","isIuz",fapl_id,logfile,flags,buf_size);
    
    if(NULL == (plist = H5P_object_verify(fapl_id,H5P_FILE_ACCESS)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file access property list");
       
    fa.logfile=(char*)logfile;
    fa.flags=flags;
    fa.buf_size=buf_size;
    ret_value= H5P_set_driver(plist, H5FD_LOG, &fa);

done:
    FUNC_LEAVE_API(ret_value);
}
#endif /* H5_WANT_H5_V1_4_COMPAT */


/*-------------------------------------------------------------------------
 * Function:      H5FD_log_fapl_get
 *
 * Purpose: Returns a file access property list which indicates how the
 *          specified file is being accessed. The return list could be
 *          used to access another file the same way.
 *
 * Return:  Success:    Ptr to new file access property list with all
 *                      members copied from the file struct.
 *
 *          Failure:    NULL
 *
 * Programmer:    Quincey Koziol
 *              Thursday, April 20, 2000
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static void *
H5FD_log_fapl_get(H5FD_t *_file)
{
    H5FD_log_t    *file = (H5FD_log_t*)_file;
    void *ret_value;    /* Return value */

    FUNC_ENTER_NOAPI(H5FD_log_fapl_get, NULL);

    /* Set return value */
    ret_value= H5FD_log_fapl_copy(&(file->fa));

done:
    FUNC_LEAVE_NOAPI(ret_value);
} /* end H5FD_log_fapl_get() */


/*-------------------------------------------------------------------------
 * Function:      H5FD_log_fapl_copy
 *
 * Purpose: Copies the log-specific file access properties.
 *
 * Return:  Success:    Ptr to a new property list
 *
 *          Failure:    NULL
 *
 * Programmer:    Quincey Koziol
 *              Thursday, April 20, 2000
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static void *
H5FD_log_fapl_copy(const void *_old_fa)
{
    const H5FD_log_fapl_t *old_fa = (const H5FD_log_fapl_t*)_old_fa;
    H5FD_log_fapl_t *new_fa = H5MM_malloc(sizeof(H5FD_log_fapl_t));
    void *ret_value;    /* Return value */
    
    FUNC_ENTER_NOAPI(H5FD_log_fapl_copy, NULL);

    assert(new_fa);

    /* Copy the general information */
    HDmemcpy(new_fa, old_fa, sizeof(H5FD_log_fapl_t));

    /* Deep copy the log file name */
    if(old_fa->logfile!=NULL)
        if (NULL==(new_fa->logfile=HDstrdup(old_fa->logfile)))
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "unable to allocate log file name");

    /* Set return value */
    ret_value=new_fa;

done:
    FUNC_LEAVE_NOAPI(ret_value);
} /* end H5FD_log_fapl_copy() */


/*-------------------------------------------------------------------------
 * Function:      H5FD_log_fapl_free
 *
 * Purpose: Frees the log-specific file access properties.
 *
 * Return:  Success:    0
 *
 *          Failure:    -1
 *
 * Programmer:    Quincey Koziol
 *              Thursday, April 20, 2000
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FD_log_fapl_free(void *_fa)
{
    H5FD_log_fapl_t     *fa = (H5FD_log_fapl_t*)_fa;
    herr_t ret_value=SUCCEED;   /* Return value */

    FUNC_ENTER_NOAPI(H5FD_log_fapl_free, FAIL);

    /* Free the fapl information */
    if(fa->logfile)
        H5MM_xfree(fa->logfile);
    H5MM_xfree(fa);

done:
    FUNC_LEAVE_NOAPI(ret_value);
} /* end H5FD_log_fapl_free() */


/*-------------------------------------------------------------------------
 * Function:      H5FD_log_open
 *
 * Purpose: Create and/or opens a Unix file as an HDF5 file.
 *
 * Return:  Success:    A pointer to a new file data structure. The
 *                      public fields will be initialized by the
 *                      caller, which is always H5FD_open().
 *
 *          Failure:    NULL
 *
 * Programmer:    Robb Matzke
 *              Thursday, July 29, 1999
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static H5FD_t *
H5FD_log_open(const char *name, unsigned flags, hid_t fapl_id,
             haddr_t maxaddr)
{
    int         o_flags;
    int           fd=(-1);
    H5FD_log_t    *file=NULL;
    H5FD_log_fapl_t     *fa;     /* File access property list information */
#ifdef WIN32
    HFILE filehandle;
    struct _BY_HANDLE_FILE_INFORMATION fileinfo;
    int results;   
#endif
    h5_stat_t sb;
    H5P_genplist_t *plist;      /* Property list */
    H5FD_t  *ret_value;

    FUNC_ENTER_NOAPI(H5FD_log_open, NULL);

    /* Check arguments */
    if (!name || !*name)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "invalid file name");
    if (0==maxaddr || HADDR_UNDEF==maxaddr)
        HGOTO_ERROR(H5E_ARGS, H5E_BADRANGE, NULL, "bogus maxaddr");
    if (ADDR_OVERFLOW(maxaddr))
        HGOTO_ERROR(H5E_ARGS, H5E_OVERFLOW, NULL, "bogus maxaddr");

    /* Build the open flags */
    o_flags = (H5F_ACC_RDWR & flags) ? O_RDWR : O_RDONLY;
    if (H5F_ACC_TRUNC & flags) o_flags |= O_TRUNC;
    if (H5F_ACC_CREAT & flags) o_flags |= O_CREAT;
    if (H5F_ACC_EXCL & flags) o_flags |= O_EXCL;

    /* Open the file */
    if ((fd=HDopen(name, o_flags, 0666))<0)
        HGOTO_ERROR(H5E_FILE, H5E_CANTOPENFILE, NULL, "unable to open file");
    if (HDfstat(fd, &sb)<0)
        HGOTO_ERROR(H5E_FILE, H5E_BADFILE, NULL, "unable to fstat file");

    /* Create the new file struct */
    if (NULL==(file=H5MM_calloc(sizeof(H5FD_log_t))))
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "unable to allocate file struct");

    /* Get the driver specific information */
    if(NULL == (plist = H5P_object_verify(fapl_id,H5P_FILE_ACCESS)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a file access property list");
    fa = H5P_get_driver_info(plist);

    file->fd = fd;
    file->eof = sb.st_size;
    file->pos = HADDR_UNDEF;
    file->op = OP_UNKNOWN;
#ifdef WIN32
    filehandle = _get_osfhandle(fd);
    results = GetFileInformationByHandle((HANDLE)filehandle, &fileinfo);
    file->fileindexhi = fileinfo.nFileIndexHigh;
    file->fileindexlo = fileinfo.nFileIndexLow;
#else
    file->device = sb.st_dev;
    file->inode = sb.st_ino;
#endif

    /* Get the flags for logging */
    file->fa.flags=fa->flags;

    /* Check if we are doing any logging at all */
    if(file->fa.flags!=0) {
        file->iosize=fa->buf_size;
        if(file->fa.flags&H5FD_LOG_NUM_READ) {
            file->nread=H5MM_calloc(file->iosize);
            assert(file->nread);
        } /* end if */
        if(file->fa.flags&H5FD_LOG_NUM_WRITE) {
            file->nwrite=H5MM_calloc(file->iosize);
            assert(file->nwrite);
        } /* end if */
        if(file->fa.flags&H5FD_LOG_FLAVOR) {
            file->flavor=H5MM_calloc(file->iosize);
            assert(file->flavor);
        } /* end if */
        if(fa->logfile)
            file->logfp=HDfopen(fa->logfile,"w");
        else
            file->logfp=stderr;
    } /* end if */

    /* Set return value */
    ret_value=(H5FD_t*)file;

done:
    if(ret_value==NULL) {
        if(fd>=0)
            HDclose(fd);
    } /* end if */

    FUNC_LEAVE_NOAPI(ret_value);
} /* end H5FD_log_open() */


/*-------------------------------------------------------------------------
 * Function:      H5FD_log_close
 *
 * Purpose: Closes a Unix file.
 *
 * Return:  Success:    0
 *
 *          Failure:    -1, file not closed.
 *
 * Programmer:    Robb Matzke
 *              Thursday, July 29, 1999
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FD_log_close(H5FD_t *_file)
{
    H5FD_log_t    *file = (H5FD_log_t*)_file;
#ifdef H5_HAVE_GETTIMEOFDAY
    struct timeval timeval_start,timeval_stop;
    struct timeval timeval_diff;
#endif /* H5_HAVE_GETTIMEOFDAY */
    herr_t      ret_value=SUCCEED;       /* Return value */

    FUNC_ENTER_NOAPI(H5FD_log_close, FAIL);

#ifdef H5_HAVE_GETTIMEOFDAY
    if(file->fa.flags&H5FD_LOG_TIME_CLOSE)
        HDgettimeofday(&timeval_start,NULL);
#endif /* H5_HAVE_GETTIMEOFDAY */
    if (close(file->fd)<0)
        HGOTO_ERROR(H5E_IO, H5E_CANTCLOSEFILE, FAIL, "unable to close file");
#ifdef H5_HAVE_GETTIMEOFDAY
    if(file->fa.flags&H5FD_LOG_TIME_CLOSE)
        HDgettimeofday(&timeval_stop,NULL);
#endif /* H5_HAVE_GETTIMEOFDAY */

    /* Dump I/O information */
    if(file->fa.flags!=0) {
        haddr_t addr;
        haddr_t last_addr;
        unsigned char last_val;

#ifdef H5_HAVE_GETTIMEOFDAY
        if(file->fa.flags&H5FD_LOG_TIME_CLOSE) {
             /* Calculate the elapsed gettimeofday time */
             timeval_diff.tv_usec=timeval_stop.tv_usec-timeval_start.tv_usec;
             timeval_diff.tv_sec=timeval_stop.tv_sec-timeval_start.tv_sec;
             if(timeval_diff.tv_usec<0) {
                 timeval_diff.tv_usec+=1000000;
                 timeval_diff.tv_sec--;
             } /* end if */
            HDfprintf(file->logfp,"Close took: (%f s)\n",(double)timeval_diff.tv_sec+((double)timeval_diff.tv_usec/(double)1000000.0));
        } /* end if */
#endif /* H5_HAVE_GETTIMEOFDAY */

        /* Dump the write I/O information */
        if(file->fa.flags&H5FD_LOG_FILE_WRITE) {
            HDfprintf(file->logfp,"Dumping write I/O information:\n");
            last_val=file->nwrite[0];
            last_addr=0;
            addr=1;
            while(addr<file->eoa) {
                if(file->nwrite[addr]!=last_val) {
                    HDfprintf(file->logfp,"\tAddr %10a-%10a (%10lu bytes) written to %3d times\n",last_addr,(addr-1),(unsigned long)(addr-last_addr),(int)last_val);
                    last_val=file->nwrite[addr];
                    last_addr=addr;
                } /* end if */
                addr++;
            } /* end while */
            HDfprintf(file->logfp,"\tAddr %10a-%10a (%10lu bytes) written to %3d times\n",last_addr,(addr-1),(unsigned long)(addr-last_addr),(int)last_val);
        } /* end if */

        /* Dump the read I/O information */
        if(file->fa.flags&H5FD_LOG_FILE_READ) {
            HDfprintf(file->logfp,"Dumping read I/O information:\n");
            last_val=file->nread[0];
            last_addr=0;
            addr=1;
            while(addr<file->eoa) {
                if(file->nread[addr]!=last_val) {
                    HDfprintf(file->logfp,"\tAddr %10a-%10a (%10lu bytes) read from %3d times\n",last_addr,(addr-1),(unsigned long)(addr-last_addr),(int)last_val);
                    last_val=file->nread[addr];
                    last_addr=addr;
                } /* end if */
                addr++;
            } /* end while */
            HDfprintf(file->logfp,"\tAddr %10a-%10a (%10lu bytes) read from %3d times\n",last_addr,(addr-1),(unsigned long)(addr-last_addr),(int)last_val);
        } /* end if */

        /* Dump the I/O flavor information */
        if(file->fa.flags&H5FD_LOG_FLAVOR) {
            HDfprintf(file->logfp,"Dumping I/O flavor information:\n");
            last_val=file->flavor[0];
            last_addr=0;
            addr=1;
            while(addr<file->eoa) {
                if(file->flavor[addr]!=last_val) {
                    HDfprintf(file->logfp,"\tAddr %10a-%10a (%10lu bytes) flavor is %s\n",last_addr,(addr-1),(unsigned long)(addr-last_addr),flavors[last_val]);
                    last_val=file->flavor[addr];
                    last_addr=addr;
                } /* end if */
                addr++;
            } /* end while */
            HDfprintf(file->logfp,"\tAddr %10a-%10a (%10lu bytes) flavor is %s\n",last_addr,(addr-1),(unsigned long)(addr-last_addr),flavors[last_val]);
        } /* end if */

        /* Free the logging information */
        if(file->fa.flags&H5FD_LOG_FILE_WRITE)
            file->nwrite=H5MM_xfree(file->nwrite);
        if(file->fa.flags&H5FD_LOG_FILE_READ)
            file->nread=H5MM_xfree(file->nread);
        if(file->fa.flags&H5FD_LOG_FLAVOR)
            file->flavor=H5MM_xfree(file->flavor);
        if(file->logfp!=stderr)
            fclose(file->logfp);
    } /* end if */

    H5MM_xfree(file);

done:
    FUNC_LEAVE_NOAPI(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5FD_log_cmp
 *
 * Purpose: Compares two files belonging to this driver using an
 *          arbitrary (but consistent) ordering.
 *
 * Return:  Success:    A value like strcmp()
 *
 *          Failure:    never fails (arguments were checked by the
 *                      caller).
 *
 * Programmer:    Robb Matzke
 *              Thursday, July 29, 1999
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static int
H5FD_log_cmp(const H5FD_t *_f1, const H5FD_t *_f2)
{
    const H5FD_log_t    *f1 = (const H5FD_log_t*)_f1;
    const H5FD_log_t    *f2 = (const H5FD_log_t*)_f2;
    int ret_value=0;

    FUNC_ENTER_NOAPI(H5FD_log_cmp, H5FD_VFD_DEFAULT);

#ifdef WIN32
    if (f1->fileindexhi < f2->fileindexhi) HGOTO_DONE(-1);
    if (f1->fileindexhi > f2->fileindexhi) HGOTO_DONE(1);

    if (f1->fileindexlo < f2->fileindexlo) HGOTO_DONE(-1);
    if (f1->fileindexlo > f2->fileindexlo) HGOTO_DONE(1);

#else
#ifdef H5_DEV_T_IS_SCALAR
    if (f1->device < f2->device) HGOTO_DONE(-1);
    if (f1->device > f2->device) HGOTO_DONE(1);
#else /* H5_DEV_T_IS_SCALAR */
    /* If dev_t isn't a scalar value on this system, just use memcmp to
     * determine if the values are the same or not.  The actual return value
     * shouldn't really matter...
     */
    if(HDmemcmp(&(f1->device),&(f2->device),sizeof(dev_t))<0) HGOTO_DONE(-1);
    if(HDmemcmp(&(f1->device),&(f2->device),sizeof(dev_t))>0) HGOTO_DONE(1);
#endif /* H5_DEV_T_IS_SCALAR */

    if (f1->inode < f2->inode) HGOTO_DONE(-1);
    if (f1->inode > f2->inode) HGOTO_DONE(1);
#endif

done:
    FUNC_LEAVE_NOAPI(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5FD_log_query
 *
 * Purpose: Set the flags that this VFL driver is capable of supporting.
 *              (listed in H5FDpublic.h)
 *
 * Return:  Success:    non-negative
 *
 *          Failure:    negative
 *
 * Programmer:    Quincey Koziol
 *              Friday, August 25, 2000
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FD_log_query(const H5FD_t UNUSED * _f, unsigned long *flags /* out */)
{
    herr_t ret_value=SUCCEED;

    FUNC_ENTER_NOAPI(H5FD_log_query, FAIL);

    /* Set the VFL feature flags that this driver supports */
    if(flags) {
        *flags = 0;
        *flags|=H5FD_FEAT_AGGREGATE_METADATA; /* OK to aggregate metadata allocations */
        *flags|=H5FD_FEAT_ACCUMULATE_METADATA; /* OK to accumulate metadata for faster writes */
        *flags|=H5FD_FEAT_DATA_SIEVE;       /* OK to perform data sieving for faster raw data reads & writes */
        *flags|=H5FD_FEAT_AGGREGATE_SMALLDATA; /* OK to aggregate "small" raw data allocations */
    }

done:
    FUNC_LEAVE_NOAPI(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5FD_log_alloc
 *
 * Purpose: Allocate file memory.
 *
 * Return:  Success:    Address of new memory
 *
 *          Failure:    HADDR_UNDEF
 *
 * Programmer:    Quincey Koziol
 *              Monday, April 17, 2000
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static haddr_t
H5FD_log_alloc(H5FD_t *_file, H5FD_mem_t type, hid_t UNUSED dxpl_id, hsize_t size)
{
    H5FD_log_t    *file = (H5FD_log_t*)_file;
    haddr_t       addr;
    haddr_t ret_value;          /* Return value */

    FUNC_ENTER_NOAPI(H5FD_log_alloc, HADDR_UNDEF);

    /* Compute the address for the block to allocate */
    addr = file->eoa;

    /* Check if we need to align this block */
    if(size>=file->pub.threshold) {
        /* Check for an already aligned block */
        if(addr%file->pub.alignment!=0)
            addr=((addr/file->pub.alignment)+1)*file->pub.alignment;
    } /* end if */

    file->eoa = addr+size;

    /* Retain the (first) flavor of the information written to the file */
    if(file->fa.flags!=0) {
        if(file->fa.flags&H5FD_LOG_FLAVOR) {
            assert(addr<file->iosize);
            H5_CHECK_OVERFLOW(size,hsize_t,size_t);
            HDmemset(&file->flavor[addr],type,(size_t)size);
        } /* end if */

        if(file->fa.flags&H5FD_LOG_ALLOC)
            HDfprintf(file->logfp,"%10a-%10a (%10Hu bytes) Allocated, flavor=%s\n",addr,addr+size-1,size,flavors[type]);
    } /* end if */

    /* Set return value */
    ret_value=addr;

done:
    FUNC_LEAVE_NOAPI(ret_value);
}   /* H5FD_log_alloc() */


/*-------------------------------------------------------------------------
 * Function:      H5FD_log_get_eoa
 *
 * Purpose: Gets the end-of-address marker for the file. The EOA marker
 *          is the first address past the last byte allocated in the
 *          format address space.
 *
 * Return:  Success:    The end-of-address marker.
 *
 *          Failure:    HADDR_UNDEF
 *
 * Programmer:    Robb Matzke
 *              Monday, August  2, 1999
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static haddr_t
H5FD_log_get_eoa(H5FD_t *_file)
{
    H5FD_log_t    *file = (H5FD_log_t*)_file;
    haddr_t ret_value;          /* Return value */

    FUNC_ENTER_NOAPI(H5FD_log_get_eoa, HADDR_UNDEF);

    /* Set return value */
    ret_value=file->eoa;

done:
    FUNC_LEAVE_NOAPI(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5FD_log_set_eoa
 *
 * Purpose: Set the end-of-address marker for the file. This function is
 *          called shortly after an existing HDF5 file is opened in order
 *          to tell the driver where the end of the HDF5 data is located.
 *
 * Return:  Success:    0
 *
 *          Failure:    -1
 *
 * Programmer:    Robb Matzke
 *              Thursday, July 29, 1999
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FD_log_set_eoa(H5FD_t *_file, haddr_t addr)
{
    H5FD_log_t    *file = (H5FD_log_t*)_file;
    herr_t ret_value=SUCCEED;   /* Return value */

    FUNC_ENTER_NOAPI(H5FD_log_set_eoa, FAIL);

    file->eoa = addr;

done:
    FUNC_LEAVE_NOAPI(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5FD_log_get_eof
 *
 * Purpose: Returns the end-of-file marker, which is the greater of
 *          either the Unix end-of-file or the HDF5 end-of-address
 *          markers.
 *
 * Return:  Success:    End of file address, the first address past
 *                      the end of the "file", either the Unix file
 *                      or the HDF5 file.
 *
 *          Failure:    HADDR_UNDEF
 *
 * Programmer:    Robb Matzke
 *              Thursday, July 29, 1999
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static haddr_t
H5FD_log_get_eof(H5FD_t *_file)
{
    H5FD_log_t    *file = (H5FD_log_t*)_file;
    haddr_t ret_value;          /* Return value */

    FUNC_ENTER_NOAPI(H5FD_get_get_eof, HADDR_UNDEF);

    /* Set return value */
    ret_value=MAX(file->eof, file->eoa);

done:
    FUNC_LEAVE_NOAPI(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:       H5FD_log_get_handle
 * 
 * Purpose:        Returns the file handle of LOG file driver.
 * 
 * Returns:        Non-negative if succeed or negative if fails.
 * 
 * Programmer:     Raymond Lu
 *                 Sept. 16, 2002
 *                 
 * Modifications:  
 * 
 *-------------------------------------------------------------------------
 */
static herr_t
H5FD_log_get_handle(H5FD_t *_file, hid_t UNUSED fapl, void** file_handle)
{   
    H5FD_log_t          *file = (H5FD_log_t *)_file;
    herr_t              ret_value = SUCCEED;
                                                   
    FUNC_ENTER_NOAPI(H5FD_log_get_handle, FAIL);

    if(!file_handle)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "file handle not valid");

    *file_handle = &(file->fd);
                                                                                                                                     
done:   
    FUNC_LEAVE_NOAPI(ret_value);
}   
            

/*-------------------------------------------------------------------------
 * Function:      H5FD_log_read
 *
 * Purpose: Reads SIZE bytes of data from FILE beginning at address ADDR
 *          into buffer BUF according to data transfer properties in
 *          DXPL_ID.
 *
 * Return:  Success:    Zero. Result is stored in caller-supplied
 *                      buffer BUF.
 *
 *          Failure:    -1, Contents of buffer BUF are undefined.
 *
 * Programmer:    Robb Matzke
 *              Thursday, July 29, 1999
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FD_log_read(H5FD_t *_file, H5FD_mem_t UNUSED type, hid_t UNUSED dxpl_id, haddr_t addr,
             size_t size, void *buf/*out*/)
{
    H5FD_log_t          *file = (H5FD_log_t*)_file;
    ssize_t       nbytes;
    herr_t      ret_value=SUCCEED;       /* Return value */
    
    FUNC_ENTER_NOAPI(H5FD_log_read, FAIL);

    assert(file && file->pub.cls);
    assert(buf);

    /* Check for overflow conditions */
    if (HADDR_UNDEF==addr)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "addr undefined");
    if (REGION_OVERFLOW(addr, size))
        HGOTO_ERROR(H5E_ARGS, H5E_OVERFLOW, FAIL, "addr overflow");
    if (addr+size>file->eoa)
        HGOTO_ERROR(H5E_ARGS, H5E_OVERFLOW, FAIL, "addr overflow");

    /* Log the I/O information about the read */
    if(file->fa.flags!=0) {
        size_t tmp_size=size;
        haddr_t tmp_addr=addr;

        /* Log information about the number of times these locations are read */
        if(file->fa.flags&H5FD_LOG_FILE_READ) {
            assert((addr+size)<file->iosize);
            while(tmp_size-->0)
                file->nread[tmp_addr++]++;
        } /* end if */

        /* Log information about the seek, if it's going to occur */
        if(file->fa.flags&H5FD_LOG_LOC_SEEK) {
            if(addr!=file->pos || OP_READ!=file->op)
                HDfprintf(file->logfp,"Seek: From %10a To %10a\n",file->pos,addr);
        } /* end if */

        /* Log information about the read */
        if(file->fa.flags&H5FD_LOG_LOC_READ) {
            /* Output the flavor information, if we have it */
            if(file->fa.flags&H5FD_LOG_FLAVOR)
                HDfprintf(file->logfp,"%10a-%10a (%10Zu bytes) Read, flavor=%s\n",addr,addr+size-1,size,flavors[file->flavor[addr]]);
            else
                HDfprintf(file->logfp,"%10a-%10a (%10Zu bytes) Read\n",addr,addr+size-1,size);
        } /* end if */
    } /* end if */

    /* Seek to the correct location */
    if ((addr!=file->pos || OP_READ!=file->op) &&
            file_seek(file->fd, (file_offset_t)addr, SEEK_SET)<0) {
        file->pos = HADDR_UNDEF;
        file->op = OP_UNKNOWN;
        HGOTO_ERROR(H5E_IO, H5E_SEEKERROR, FAIL, "unable to seek to proper position");
    }

    /*
     * Read data, being careful of interrupted system calls, partial results,
     * and the end of the file.
     */
    while (size>0) {
        do {
            nbytes = HDread(file->fd, buf, size);
        } while (-1==nbytes && EINTR==errno);
        if (-1==nbytes) {
            /* error */
            file->pos = HADDR_UNDEF;
            file->op = OP_UNKNOWN;
            HGOTO_ERROR(H5E_IO, H5E_READERROR, FAIL, "file read failed");
        }
        if (0==nbytes) {
            /* end of file but not end of format address space */
            HDmemset(buf, 0, size);
            size = 0;
        }
        assert(nbytes>=0);
        assert((size_t)nbytes<=size);
        size -= nbytes;
        addr += (haddr_t)nbytes;
        buf = (char*)buf + nbytes;
    }
    
    /* Update current position */
    file->pos = addr;
    file->op = OP_READ;

done:
    FUNC_LEAVE_NOAPI(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5FD_log_write
 *
 * Purpose: Writes SIZE bytes of data to FILE beginning at address ADDR
 *          from buffer BUF according to data transfer properties in
 *          DXPL_ID.
 *
 * Return:  Success:    Zero
 *
 *          Failure:    -1
 *
 * Programmer:    Robb Matzke
 *              Thursday, July 29, 1999
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FD_log_write(H5FD_t *_file, H5FD_mem_t type, hid_t UNUSED dxpl_id, haddr_t addr,
            size_t size, const void *buf)
{
    H5FD_log_t          *file = (H5FD_log_t*)_file;
    ssize_t       nbytes;
    size_t      orig_size=size; /* Save the original size for later */
    haddr_t     orig_addr=addr;
#ifdef H5_HAVE_GETTIMEOFDAY
    struct timeval timeval_start,timeval_stop;
    struct timeval timeval_diff;
#endif /* H5_HAVE_GETTIMEOFDAY */
    herr_t      ret_value=SUCCEED;       /* Return value */
    
    FUNC_ENTER_NOAPI(H5FD_log_write, FAIL);

    assert(file && file->pub.cls);
    assert(size>0);
    assert(buf);

    /* Verify that we are writing out the type of data we allocated in this location */
    assert(type==H5FD_MEM_DEFAULT || type==file->flavor[addr] || file->flavor[addr]==H5FD_MEM_DEFAULT);
    assert(type==H5FD_MEM_DEFAULT || type==file->flavor[(addr+size)-1] || file->flavor[(addr+size)-1]==H5FD_MEM_DEFAULT);

    /* Check for overflow conditions */
    if (HADDR_UNDEF==addr) 
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "addr undefined");
    if (REGION_OVERFLOW(addr, size))
        HGOTO_ERROR(H5E_ARGS, H5E_OVERFLOW, FAIL, "addr overflow");
    if (addr+size>file->eoa)
        HGOTO_ERROR(H5E_ARGS, H5E_OVERFLOW, FAIL, "addr overflow");
    
    /* Log the I/O information about the write */
    if(file->fa.flags&H5FD_LOG_FILE_WRITE) {
        size_t tmp_size=size;
        haddr_t tmp_addr=addr;

        assert((addr+size)<file->iosize);
        while(tmp_size-->0)
            file->nwrite[tmp_addr++]++;
    } /* end if */

    /* Seek to the correct location */
    if (addr!=file->pos || OP_WRITE!=file->op) {
#ifdef H5_HAVE_GETTIMEOFDAY
        if(file->fa.flags&H5FD_LOG_TIME_SEEK)
            HDgettimeofday(&timeval_start,NULL);
#endif /* H5_HAVE_GETTIMEOFDAY */
        if(file_seek(file->fd, (file_offset_t)addr, SEEK_SET)<0) {
            file->pos = HADDR_UNDEF;
            file->op = OP_UNKNOWN;
            HGOTO_ERROR(H5E_IO, H5E_SEEKERROR, FAIL, "unable to seek to proper position");
        } /* end if */
#ifdef H5_HAVE_GETTIMEOFDAY
        if(file->fa.flags&H5FD_LOG_TIME_SEEK)
            HDgettimeofday(&timeval_stop,NULL);
#endif /* H5_HAVE_GETTIMEOFDAY */

        /* Log information about the seek */
        if(file->fa.flags&H5FD_LOG_LOC_SEEK) {
#ifdef H5_HAVE_GETTIMEOFDAY
            HDfprintf(file->logfp,"Seek: From %10a To %10a",file->pos,addr);
            if(file->fa.flags&H5FD_LOG_TIME_SEEK) {
                 /* Calculate the elapsed gettimeofday time */
                 timeval_diff.tv_usec=timeval_stop.tv_usec-timeval_start.tv_usec;
                 timeval_diff.tv_sec=timeval_stop.tv_sec-timeval_start.tv_sec;
                 if(timeval_diff.tv_usec<0) {
                     timeval_diff.tv_usec+=1000000;
                     timeval_diff.tv_sec--;
                 } /* end if */
                HDfprintf(file->logfp," (%f s)\n",(double)timeval_diff.tv_sec+((double)timeval_diff.tv_usec/(double)1000000.0));
            } /* end if */
            else 
                HDfprintf(file->logfp,"\n");
#else /* H5_HAVE_GETTIMEOFDAY */
            HDfprintf(file->logfp,"Seek: From %10a To %10a\n",file->pos,addr);
#endif /* H5_HAVE_GETTIMEOFDAY */
        } /* end if */
    } /* end if */

    /*
     * Write the data, being careful of interrupted system calls and partial
     * results
     */
#ifdef H5_HAVE_GETTIMEOFDAY
    if(file->fa.flags&H5FD_LOG_TIME_WRITE)
        HDgettimeofday(&timeval_start,NULL);
#endif /* H5_HAVE_GETTIMEOFDAY */
    while (size>0) {
        do {
            nbytes = HDwrite(file->fd, buf, size);
        } while (-1==nbytes && EINTR==errno);
        if (-1==nbytes) {
            /* error */
            file->pos = HADDR_UNDEF;
            file->op = OP_UNKNOWN;
            if(file->fa.flags&H5FD_LOG_LOC_WRITE)
                HDfprintf(file->logfp,"Error! Writing: %10a-%10a (%10Zu bytes)\n",orig_addr,orig_addr+orig_size-1,orig_size);
            HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "file write failed");
        }
        assert(nbytes>0);
        assert((size_t)nbytes<=size);
        size -= nbytes;
        addr += (haddr_t)nbytes;
        buf = (const char*)buf + nbytes;
    }
#ifdef H5_HAVE_GETTIMEOFDAY
    if(file->fa.flags&H5FD_LOG_TIME_WRITE)
        HDgettimeofday(&timeval_stop,NULL);
#endif /* H5_HAVE_GETTIMEOFDAY */
    
    /* Log information about the write */
    if(file->fa.flags&H5FD_LOG_LOC_WRITE) {
        /* Output the flavor information, if desired */
        if(file->fa.flags&H5FD_LOG_FLAVOR)
            HDfprintf(file->logfp,"%10a-%10a (%10Zu bytes) (%s) Written",orig_addr,orig_addr+orig_size-1,orig_size,flavors[file->flavor[orig_addr]]);
        else
            HDfprintf(file->logfp,"%10a-%10a (%10Zu bytes) Written",orig_addr,orig_addr+orig_size-1,orig_size);

        /* Check if this is the first write into a "default" section, grabbed by the metadata agregation algorithm */
        if(file->fa.flags&H5FD_LOG_FLAVOR) {
            if(file->flavor[orig_addr]==H5FD_MEM_DEFAULT)
                HDmemset(&file->flavor[orig_addr],type,orig_size);
        } /* end if */

#ifdef H5_HAVE_GETTIMEOFDAY
        if(file->fa.flags&H5FD_LOG_TIME_WRITE) {
             /* Calculate the elapsed gettimeofday time */
             timeval_diff.tv_usec=timeval_stop.tv_usec-timeval_start.tv_usec;
             timeval_diff.tv_sec=timeval_stop.tv_sec-timeval_start.tv_sec;
             if(timeval_diff.tv_usec<0) {
                 timeval_diff.tv_usec+=1000000;
                 timeval_diff.tv_sec--;
             } /* end if */
            HDfprintf(file->logfp," (%f s)\n",(double)timeval_diff.tv_sec+((double)timeval_diff.tv_usec/(double)1000000.0));
        } /* end if */
        else
            HDfprintf(file->logfp,"\n");
#else /* H5_HAVE_GETTIMEOFDAY */
        HDfprintf(file->logfp,"\n");
#endif /* H5_HAVE_GETTIMEOFDAY */
    } /* end if */

    /* Update current position and eof */
    file->pos = addr;
    file->op = OP_WRITE;
    if (file->pos>file->eof)
        file->eof = file->pos;

done:
    FUNC_LEAVE_NOAPI(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:      H5FD_log_flush
 *
 * Purpose: Makes sure that the true file size is the same (or larger)
 *          than the end-of-address.
 *
 * Return:  Success:    Non-negative
 *
 *          Failure:    Negative
 *
 * Programmer:    Robb Matzke
 *              Wednesday, August  4, 1999
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FD_log_flush(H5FD_t *_file, hid_t UNUSED dxpl_id, unsigned UNUSED closing)
{
    H5FD_log_t    *file = (H5FD_log_t*)_file;
    herr_t      ret_value=SUCCEED;       /* Return value */

    FUNC_ENTER_NOAPI(H5FD_log_flush, FAIL);

    if (file->eoa>file->eof) {
        if (-1==file_seek(file->fd, (file_offset_t)(file->eoa-1), SEEK_SET))
            HGOTO_ERROR(H5E_IO, H5E_SEEKERROR, FAIL, "unable to seek to proper position");
        if (write(file->fd, "", 1)!=1)
            HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "file write failed");
        file->eof = file->eoa;
        file->pos = file->eoa;
        file->op = OP_WRITE;
    }

done:
    FUNC_LEAVE_NOAPI(ret_value);
}

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