os_stat.c

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1997-2005
 *      Sleepycat Software.  All rights reserved.
 *
 * $Id: os_stat.c,v 12.1 2005/06/16 20:23:31 bostic Exp $
 */

#include "db_config.h"

#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#include <sys/stat.h>

#include <string.h>
#endif

#include "db_int.h"

/*
 * __os_exists --
 *      Return if the file exists.
 */
int
__os_exists(path, isdirp)
        const char *path;
        int *isdirp;
{
        int ret;
        DWORD attrs;
        _TCHAR *tpath;

        if (DB_GLOBAL(j_exists) != NULL)
                return (DB_GLOBAL(j_exists)(path, isdirp));

        TO_TSTRING(NULL, path, tpath, ret);
        if (ret != 0)
                return (ret);

        RETRY_CHK(
            ((attrs = GetFileAttributes(tpath)) == (DWORD)-1 ? 1 : 0), ret);

        if (ret == 0 && isdirp != NULL)
                *isdirp = (attrs & FILE_ATTRIBUTE_DIRECTORY);

        FREE_STRING(NULL, tpath);
        return (ret);
}

/*
 * __os_ioinfo --
 *      Return file size and I/O size; abstracted to make it easier
 *      to replace.
 */
int
__os_ioinfo(dbenv, path, fhp, mbytesp, bytesp, iosizep)
        DB_ENV *dbenv;
        const char *path;
        DB_FH *fhp;
        u_int32_t *mbytesp, *bytesp, *iosizep;
{
        int ret;
        BY_HANDLE_FILE_INFORMATION bhfi;
        unsigned __int64 filesize;

        if (DB_GLOBAL(j_ioinfo) != NULL)
                return (DB_GLOBAL(j_ioinfo)(path,
                    fhp->fd, mbytesp, bytesp, iosizep));

        RETRY_CHK((!GetFileInformationByHandle(fhp->handle, &bhfi)), ret);
        if (ret != 0) {
                __db_err(dbenv,
                    "GetFileInformationByHandle: %s", strerror(ret));
                return (ret);
        }

        filesize = ((unsigned __int64)bhfi.nFileSizeHigh << 32) +
            bhfi.nFileSizeLow;

        /* Return the size of the file. */
        if (mbytesp != NULL)
                *mbytesp = (u_int32_t)(filesize / MEGABYTE);
        if (bytesp != NULL)
                *bytesp = (u_int32_t)(filesize % MEGABYTE);

        /*
         * The filesystem blocksize is not easily available.  In particular,
         * the values returned by GetDiskFreeSpace() are not very helpful
         * (NTFS volumes often report 512B clusters, which are too small to
         * be a useful default).
         */
        if (iosizep != NULL)
                *iosizep = DB_DEF_IOSIZE;
        return (0);
}

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