1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
|
/*
* event notifier support
*
* Copyright Red Hat, Inc. 2010
*
* Authors:
* Michael S. Tsirkin <mst@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu-common.h"
#include "event_notifier.h"
#include "qemu-char.h"
#ifdef CONFIG_EVENTFD
#include <sys/eventfd.h>
#endif
void event_notifier_init_fd(EventNotifier *e, int fd)
{
e->fd = fd;
}
int event_notifier_init(EventNotifier *e, int active)
{
#ifdef CONFIG_EVENTFD
int fd = eventfd(!!active, EFD_NONBLOCK | EFD_CLOEXEC);
if (fd < 0)
return -errno;
e->fd = fd;
return 0;
#else
return -ENOSYS;
#endif
}
void event_notifier_cleanup(EventNotifier *e)
{
close(e->fd);
}
int event_notifier_get_fd(EventNotifier *e)
{
return e->fd;
}
int event_notifier_set_handler(EventNotifier *e,
EventNotifierHandler *handler)
{
return qemu_set_fd_handler(e->fd, (IOHandler *)handler, NULL, e);
}
int event_notifier_set(EventNotifier *e)
{
uint64_t value = 1;
int r = write(e->fd, &value, sizeof(value));
return r == sizeof(value);
}
int event_notifier_test_and_clear(EventNotifier *e)
{
uint64_t value;
int r = read(e->fd, &value, sizeof(value));
return r == sizeof(value);
}
|
