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/*
* Copyright (c) 2002-2013 Balabit
* Copyright (c) 1998-2011 Balázs Scheidler
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As an additional exemption you are allowed to compile & link against the
* OpenSSL libraries as published by the OpenSSL project. See the file
* COPYING for details.
*
*/
#include "compat/pio.h"
#if !SYSLOG_NG_HAVE_PREAD || SYSLOG_NG_HAVE_BROKEN_PREAD
#include <sys/types.h>
#include <unistd.h>
ssize_t
bb__pread(int fd, void *buf, size_t count, off_t offset)
{
ssize_t ret;
off_t old_offset;
old_offset = lseek(fd, 0, SEEK_CUR);
if (old_offset == -1)
return -1;
if (lseek(fd, offset, SEEK_SET) < 0)
return -1;
ret = read(fd, buf, count);
if (ret < 0)
return -1;
if (lseek(fd, old_offset, SEEK_SET) < 0)
return -1;
return ret;
}
ssize_t
bb__pwrite(int fd, const void *buf, size_t count, off_t offset)
{
ssize_t ret;
off_t old_offset;
old_offset = lseek(fd, 0, SEEK_CUR);
if (old_offset == -1)
return -1;
if (lseek(fd, offset, SEEK_SET) < 0)
return -1;
ret = write(fd, buf, count);
if (ret < 0)
return -1;
if (lseek(fd, old_offset, SEEK_SET) < 0)
return -1;
return ret;
}
#endif
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