db/os/os_stat.c

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

#include "config.h"

#ifndef lint
static const char sccsid[] = "@(#)os_stat.c 10.18 (Sleepycat) 10/12/98";
#endif /* not lint */

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

#include <errno.h>
#endif

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

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

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

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

    if (__db_jump.j_ioinfo != NULL)
        return (__db_jump.j_ioinfo(path, fd, mbytesp, bytesp, iosizep));

    if (fstat(fd, &sb) == -1)
        return (errno);

    /* 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);
}