kobject-event.c

/* 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/netlink.h>

int main(int argc, char *argv[])
{
        struct mnl_socket *nl;
        char buf[MNL_SOCKET_BUFFER_SIZE];
        int ret;

        nl = mnl_socket_open(NETLINK_KOBJECT_UEVENT);
        if (nl == NULL) {
                perror("mnl_socket_open");
                exit(EXIT_FAILURE);
        }

        /* There is one single group in kobject over netlink */
        if (mnl_socket_bind(nl, (1<<0), MNL_SOCKET_AUTOPID) < 0) {
                perror("mnl_socket_bind");
                exit(EXIT_FAILURE);
        }

        ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
        while (ret > 0) {
                int i;

                /* kobject uses a string based protocol, with no initial
                 * netlink header.
                 */
                for (i=0; i<ret; i++)
                        printf("%c", buf[i]);

                printf("\n");
                ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
        }
        if (ret == -1) {
                perror("error");
                exit(EXIT_FAILURE);
        }

        mnl_socket_close(nl);

        return 0;
}