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/******************************************************************************
*
* Common file operations.
*
* Copyright (c) 2009 by Citrix Systems, Inc. (Patrick Colp)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; If not, see <http://www.gnu.org/licenses/>.
*/
#include <unistd.h>
#include <xenctrl.h>
static int file_op(int fd, void *page, int i,
ssize_t (*fn)(int, void *, size_t))
{
off_t offset = i;
int total = 0;
int bytes;
offset = lseek(fd, offset << XC_PAGE_SHIFT, SEEK_SET);
if ( offset == (off_t)-1 )
return -1;
while ( total < XC_PAGE_SIZE )
{
bytes = fn(fd, page + total, XC_PAGE_SIZE - total);
if ( bytes <= 0 )
return -1;
total += bytes;
}
return 0;
}
static ssize_t my_write(int fd, void *buf, size_t count)
{
return write(fd, buf, count);
}
int read_page(int fd, void *page, int i)
{
return file_op(fd, page, i, &read);
}
int write_page(int fd, void *page, int i)
{
return file_op(fd, page, i, &my_write);
}
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* indent-tabs-mode: nil
* End:
*/
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