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https://github.com/libguestfs/libguestfs.git
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61 lines
1.4 KiB
C
61 lines
1.4 KiB
C
/* libguestfs - the guestfsd daemon
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* Copyright (C) 2009 Red Hat Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include "daemon.h"
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#include "actions.h"
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int
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do_zero (const char *device)
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{
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int fd, i;
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char buf[4096];
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fd = open (device, O_WRONLY);
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if (fd == -1) {
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reply_with_perror ("%s", device);
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return -1;
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}
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memset (buf, 0, sizeof buf);
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int err = 0;
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int saved_errno = 0;
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for (i = 0; i < 32; ++i)
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if (write (fd, buf, sizeof buf) != sizeof buf) {
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saved_errno = errno;
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err = -1;
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}
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if (close (fd) && saved_errno == 0) {
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saved_errno = errno;
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err = -1;
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}
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if (saved_errno)
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errno = saved_errno;
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return err;
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}
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