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 {
30 /*PERROR("Failed to flush file: %s", strerror(errno));*/
31 goto out;
32 }
33
34 /*
35 * Calculate last page boundary of amount written so far
36 * unless we are flushing in which case entire cache
37 * is discarded.
38 */
39 if ( !flush )
40 {
41 if ( (cur = lseek(fd, 0, SEEK_CUR)) == (off_t)-1 )
42 cur = 0;
43 cur &= ~(XC_PAGE_SIZE-1);
44 }
45
46 /* Discard from the buffer cache. */
47 if ( posix_fadvise64(fd, 0, cur, POSIX_FADV_DONTNEED) < 0 )
48 {
49 /*PERROR("Failed to discard cache: %s", strerror(errno));*/
50 goto out;
51 }
52
53 out:
54 errno = saved_errno;
55 }
56
xc_memalign(xc_interface * xch,size_t alignment,size_t size)57 void *xc_memalign(xc_interface *xch, size_t alignment, size_t size)
58 {
59 int ret;
60 void *ptr;
61
62 ret = posix_memalign(&ptr, alignment, size);
63 if (ret != 0 || !ptr)
64 return NULL;
65
66 return ptr;
67 }
68
69 /*
70 * Local variables:
71 * mode: C
72 * c-file-style: "BSD"
73 * c-basic-offset: 4
74 * tab-width: 4
75 * indent-tabs-mode: nil
76 * End:
77 */
78