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 #include <unistd.h>
23 #include <fcntl.h>
24 #include <malloc.h>
25
26 /* Optionally flush file to disk and discard page cache */
discard_file_cache(xc_interface * xch,int fd,int flush)27 void discard_file_cache(xc_interface *xch, int fd, int flush)
28 {
29 off_t cur = 0;
30 int saved_errno = errno;
31
32 if ( flush && (fsync(fd) < 0) )
33 {
34 /*PERROR("Failed to flush file: %s", strerror(errno));*/
35 goto out;
36 }
37
38 /*
39 * Calculate last page boundry of amount written so far
40 * unless we are flushing in which case entire cache
41 * is discarded.
42 */
43 if ( !flush )
44 {
45 if ( ( cur = lseek(fd, 0, SEEK_CUR)) == (off_t)-1 )
46 cur = 0;
47 cur &= ~(PAGE_SIZE - 1);
48 }
49
50 /* Discard from the buffer cache. */
51 if ( posix_fadvise(fd, 0, cur, POSIX_FADV_DONTNEED) < 0 )
52 {
53 /*PERROR("Failed to discard cache: %s", strerror(errno));*/
54 goto out;
55 }
56
57 out:
58 errno = saved_errno;
59 }
60
xc_memalign(xc_interface * xch,size_t alignment,size_t size)61 void *xc_memalign(xc_interface *xch, size_t alignment, size_t size)
62 {
63 return valloc(size);
64 }
65
66 /*
67 * Local variables:
68 * mode: C
69 * c-file-style: "BSD"
70 * c-basic-offset: 4
71 * tab-width: 4
72 * indent-tabs-mode: nil
73 * End:
74 */
75