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
|
/* This example is placed in the public domain. */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
#include <libmnl/libmnl.h>
#include <linux/genetlink.h>
static int group;
static int data_cb(const struct nlmsghdr *nlh, void *data)
{
printf("received event type=%d from genetlink group %d\n",
nlh->nlmsg_type, group);
return MNL_CB_OK;
}
int main(int argc, char *argv[])
{
struct mnl_socket *nl;
char buf[MNL_SOCKET_BUFFER_SIZE];
int ret;
if (argc != 2) {
printf("%s [group]\n", argv[0]);
exit(EXIT_FAILURE);
}
group = atoi(argv[1]);
nl = mnl_socket_open(NETLINK_GENERIC);
if (nl == NULL) {
perror("mnl_socket_open");
exit(EXIT_FAILURE);
}
if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
perror("mnl_socket_bind");
exit(EXIT_FAILURE);
}
if (mnl_socket_setsockopt(nl, NETLINK_ADD_MEMBERSHIP, &group,
sizeof(int)) < 0) {
perror("mnl_socket_setsockopt");
exit(EXIT_FAILURE);
}
ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
while (ret > 0) {
ret = mnl_cb_run(buf, ret, 0, 0, data_cb, NULL);
if (ret <= 0)
break;
ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
}
if (ret == -1) {
perror("error");
exit(EXIT_FAILURE);
}
mnl_socket_close(nl);
return 0;
}
|
