os_stat.c

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/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1997, 1998, 1999, 2000
 *      Sleepycat Software.  All rights reserved.
 */

#include "config.h"

#ifndef lint
static const char revid[] = "$Id: os__stat_8c-source.html,v 1.1 2008/06/08 10:21:32 sebdiaz Exp $";
#endif /* not lint */

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

#include "db_int.h"
#include "os_jump.h"

/*
 * CDB___os_exists --
 *      Return if the file exists.
 *
 * PUBLIC: int CDB___os_exists __P((const char *, int *));
 */
int
CDB___os_exists(path, isdirp)
        const char *path;
        int *isdirp;
{
        struct stat sb;

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

        if (stat(path, &sb) != 0)
                return (CDB___os_get_errno());

#if !defined(S_ISDIR) || defined(STAT_MACROS_BROKEN)
#if defined(_WIN32) || defined(WIN16)
#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);
}

/*
 * CDB___os_ioinfo --
 *      Return file size and I/O size; abstracted to make it easier
 *      to replace.
 *
 * PUBLIC: int CDB___os_ioinfo __P((DB_ENV *, const char *,
 * PUBLIC:    DB_FH *, u_int32_t *, u_int32_t *, u_int32_t *));
 */
int
CDB___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;
        struct stat sb;

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

        if (fstat(fhp->fd, &sb) == -1) {
                ret = CDB___os_get_errno();
                CDB___db_err(dbenv, "fstat: %s", strerror(ret));
                return (ret);
        }

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

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