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/******************************************************************************
*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*
* 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;
* version 2.1 of the License.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include "xc_private.h"
/* Optionally flush file to disk and discard page cache */
void discard_file_cache(xc_interface *xch, int fd, int flush)
{
off_t cur = 0;
int saved_errno = errno;
if ( flush && (fsync(fd) < 0) )
goto out;
/*
* Calculate last page boundary of amount written so far
* unless we are flushing in which case entire cache
* is discarded.
*/
if ( !flush )
{
if ( (cur = lseek(fd, 0, SEEK_CUR)) == (off_t)-1 )
cur = 0;
cur &= ~(XC_PAGE_SIZE-1);
}
/* Discard from the buffer cache. */
if ( posix_fadvise(fd, 0, cur, POSIX_FADV_DONTNEED) < 0 )
goto out;
out:
errno = saved_errno;
}
void *xc_memalign(xc_interface *xch, size_t alignment, size_t size)
{
int ret;
void *ptr;
ret = posix_memalign(&ptr, alignment, size);
if ( ret != 0 || !ptr )
return NULL;
return ptr;
}
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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