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#!/usr/bin/env C
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <signal.h>
#include <getopt.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/select.h>
#include <linux/types.h>
#include <linux/netlink.h>
int init_netlink_socket(int * netlink_socket)
{
struct sockaddr_nl snl;
int ret;
memset(&snl, 0, sizeof(struct sockaddr_nl));
snl.nl_family = AF_NETLINK;
snl.nl_pid = getpid();
snl.nl_groups = 1;
*netlink_socket = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
if (*netlink_socket == -1) {
fprintf(stderr, "netlink socket: %s\n", strerror(errno));
return -1;
}
ret = bind(*netlink_socket, (struct sockaddr *) & snl,
sizeof(struct sockaddr_nl));
if (ret < 0) {
fprintf(stderr, "netlink bind failed: %s\n", strerror(errno));
close(*netlink_socket);
*netlink_socket = -1;
return -1;
}
return 0;
}
int main(void)
{
int ret = -1;
int netlink_socket = -1;
int buflen = -1;
char netlink_buf[4096+1];
ret = init_netlink_socket(&netlink_socket);
if (ret) {
fprintf(stderr, "init_netlink_socket() has failed %s\n",
strerror(errno));
close(netlink_socket);
return -1;
}
while (1) {
buflen = recv(netlink_socket, netlink_buf, sizeof(netlink_buf)-1 , 0);
if (buflen <= 0) {
fprintf(stderr, "error receiving uevent message: %s\n",
strerror(errno));
} else {
netlink_buf[buflen-1] = '\0';
printf("%s\n", netlink_buf);
fflush(stdout);
}
}
return 0;
}
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