1 /******************************************************************************
2 *
3 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
4 * Use is subject to license terms.
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation;
9 * version 2.1 of the License.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; If not, see <http://www.gnu.org/licenses/>.
18 */
19
20 #include "xc_private.h"
21
22 /* Optionally flush file to disk and discard page cache */
discard_file_cache(xc_interface * xch,int fd,int flush)23 void discard_file_cache(xc_interface *xch, int fd, int flush)
24 {
25 off_t cur = 0;
26 int saved_errno = errno;
27
28 if ( flush && (fsync(fd) < 0) )
29 goto out;
30
31 /*
32 * Calculate last page boundary of amount written so far
33 * unless we are flushing in which case entire cache
34 * is discarded.
35 */
36 if ( !flush )
37 {
38 if ( (cur = lseek(fd, 0, SEEK_CUR)) == (off_t)-1 )
39 cur = 0;
40 cur &= ~(XC_PAGE_SIZE-1);
41 }
42
43 /* Discard from the buffer cache. */
44 if ( posix_fadvise(fd, 0, cur, POSIX_FADV_DONTNEED) < 0 )
45 goto out;
46
47 out:
48 errno = saved_errno;
49 }
50
xc_memalign(xc_interface * xch,size_t alignment,size_t size)51 void *xc_memalign(xc_interface *xch, size_t alignment, size_t size)
52 {
53 int ret;
54 void *ptr;
55
56 ret = posix_memalign(&ptr, alignment, size);
57 if ( ret != 0 || !ptr )
58 return NULL;
59
60 return ptr;
61 }
62
63 /*
64 * Local variables:
65 * mode: C
66 * c-file-style: "BSD"
67 * c-basic-offset: 4
68 * tab-width: 4
69 * indent-tabs-mode: nil
70 * End:
71 */
72