From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <ldv@altlinux.ru>
Date: Tue, 17 Dec 2002 11:15:14 +0300
From: "Dmitry V. Levin" <ldv@altlinux.org>
To: ALT Linux general discussion list <community@altlinux.ru>
Cc: ALT Linux Sisyphus mailing list <sisyphus@altlinux.ru>
Message-ID: <20021217081514.GB4059@basalt.office.altlinux.ru>
Mail-Followup-To: ALT Linux general discussion list <community@altlinux.ru>,
	ALT Linux Sisyphus mailing list <sisyphus@altlinux.ru>
References: <3DFD91C6.2030906@mmk.ru> <20021216105750.GD46267@osdn.org.ua> <3DFD9D9F.9060700@mmk.ru> <20021216115034.GA4765@ungrund> <3DFE91A2.4090005@mmk.ru>
Mime-Version: 1.0
Content-Type: multipart/signed; micalg=pgp-sha1;
	protocol="application/pgp-signature"; boundary="DrWhICOqskFTAXiy"
Content-Disposition: inline
In-Reply-To: <3DFE91A2.4090005@mmk.ru>
X-fingerprint: 9658 398D 181B 1200 8FC5  26B8 F6F8 846B C1E2 3429
Subject: [Comm] Re: [sisyphus] Re: du =?koi8-r?B?z9vJwsHF?=
 =?koi8-r?B?1NPRLi4u?=
Sender: community-admin@altlinux.ru
Errors-To: community-admin@altlinux.ru
X-BeenThere: community@altlinux.ru
X-Mailman-Version: 2.0.9
Precedence: bulk
Reply-To: community@altlinux.ru
List-Unsubscribe: <http://www.altlinux.ru/mailman/listinfo/community>,
	<mailto:community-request@altlinux.ru?subject=unsubscribe>
List-Id: <community.altlinux.ru>
List-Post: <mailto:community@altlinux.ru>
List-Help: <mailto:community-request@altlinux.ru?subject=help>
List-Subscribe: <http://www.altlinux.ru/mailman/listinfo/community>,
	<mailto:community-request@altlinux.ru?subject=subscribe>
List-Archive: <http://www.altlinux.ru/pipermail/community/>
Archived-At: <http://lore.altlinux.org/community/20021217081514.GB4059@basalt.office.altlinux.ru/>
List-Archive: <http://lore.altlinux.org/community/>
List-Post: <mailto:mandrake-russian@linuxteam.iplabs.ru>

--DrWhICOqskFTAXiy
Content-Type: multipart/mixed; boundary="jousvV0MzM2p6OtC"
Content-Disposition: inline
Content-Transfer-Encoding: 8bit


--jousvV0MzM2p6OtC
Content-Type: text/plain; charset=koi8-r
Content-Disposition: inline
Content-Transfer-Encoding: 8bit

On Tue, Dec 17, 2002 at 07:53:22AM +0500, Alexander Kirey wrote:
> >du означает disk usage, а вы хотите с помощью его посчитать суммарный
> >размер файлов? Он вам и показывает disk usage.
> >
> Да-с, и как это я... Но разница почти в 100 мегабайт...

Вот вам пример в числах:

1. Скомпилируйте lseek.c (attached),
2. Запустите
   $ ./lseek 0x400000000 ~/tmp/empty
3. Сравните вывод от
   $ ls -lh ~/tmp/empty
   и
   $ du -h ~/tmp/empty

P.S. Этот предмет - для community@.


--
ldv

--jousvV0MzM2p6OtC
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment; filename="lseek.c"

#include <errno.h>
#include <error.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>

int main (int ac, char *const *av)
{
	const char *fname;
	int fd;
	off_t offset;

	if (ac != 3)
		error (1, 0, "usage: offset fname");

	offset = strtoull (av[1], 0, 0);
	fname = av[2];

	fd = open (fname, O_CREAT | O_EXCL | O_WRONLY, 0600);
	if (fd < 0)
		error (1, errno, "open: %s", fname);

	if (lseek (fd, offset - 1, SEEK_SET) == (off_t)-1)
		error (1, errno, "lseek: %#llx", (unsigned long long) offset);

	if (write (fd, "", 1) < 0)
		error (1, errno, "write: %s", fname);

	if (close (fd) < 0)
		error (1, errno, "close: %s", fname);

	return 0;
}

--jousvV0MzM2p6OtC--

--DrWhICOqskFTAXiy
Content-Type: application/pgp-signature
Content-Disposition: inline

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.1 (GNU/Linux)

iD8DBQE9/t0S9viEa8HiNCkRAkx3AJ9YbJJFPgJHVVgNNuLiUcHxkwGASQCff+6r
DmJfUPKfErQIZpZr1CtfDUI=
=gFv9
-----END PGP SIGNATURE-----

--DrWhICOqskFTAXiy--