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 20:23:26 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.
 *
 * PUBLIC: int __os_exists __P((const char *, int *));
 */
int
__os_exists(path, isdirp)
        const char *path;
        int *isdirp;
{
        struct stat sb;
        int ret;

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

#ifdef HAVE_VXWORKS
        RETRY_CHK((stat((char *)path, &sb)), ret);
#else
        RETRY_CHK((stat(path, &sb)), ret);
#endif
        if (ret != 0)
                return (ret);

#if !defined(S_ISDIR) || defined(STAT_MACROS_BROKEN)
#undef  S_ISDIR
#ifdef _S_IFDIR
#define S_ISDIR(m)      (_S_IFDIR & (m))
#else
#define S_ISDIR(m)      (((m) & 0170000) == 0040000)
#endif
#endif
        if (isdirp != NULL)
                *isdirp = S_ISDIR(sb.st_mode);

        return (0);
}

/*
 * __os_ioinfo --
 *      Return file size and I/O size; abstracted to make it easier
 *      to replace.
 *
 * PUBLIC: int __os_ioinfo __P((DB_ENV *, const char *,
 * PUBLIC:    DB_FH *, u_int32_t *, u_int32_t *, u_int32_t *));
 */
int
__os_ioinfo(dbenv, path, fhp, mbytesp, bytesp, iosizep)
        DB_ENV *dbenv;
        const char *path;
        DB_FH *fhp;
        u_int32_t *mbytesp, *bytesp, *iosizep;
{
        struct stat sb;
        int ret;

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

        /* Check for illegal usage. */
        DB_ASSERT(F_ISSET(fhp, DB_FH_OPENED) && fhp->fd != -1);

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

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

        /*
         * Return the underlying filesystem blocksize, if available.
         *
         * XXX
         * Check for a 0 size -- the HP MPE/iX architecture has st_blksize,
         * but it's always 0.
         */
#ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
        if (iosizep != NULL && (*iosizep = sb.st_blksize) == 0)
                *iosizep = DB_DEF_IOSIZE;
#else
        if (iosizep != NULL)
                *iosizep = DB_DEF_IOSIZE;
#endif
        return (0);
}

---