Ankur Patel

  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>

  #include <sys/poll.h>
  #include <sys/socket.h>
  #include <sys/types.h>
  #include <unistd.h>

  #include <linux/types.h>
  #include <linux/netlink.h>

  void die(char *s)
  {
    write(2,s,strlen(s));
    exit(1);
  }

  int main(int argc, char *argv[])
  {
    struct sockaddr_nl nls;
    struct pollfd pfd;
    char buf[512];

    // Open hotplug event netlink socket

    memset(&nls,0,sizeof(struct sockaddr_nl));
    nls.nl_family = AF_NETLINK;
    nls.nl_pid = getpid();
    nls.nl_groups = -1;

    pfd.events = POLLIN;
    pfd.fd = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
    if (pfd.fd==-1)
        die("Not root\n");

    // Listen to netlink socket

    if (bind(pfd.fd, (void *)&nls, sizeof(struct sockaddr_nl)))
        die("Bind failed\n");
    while (-1!=poll(&pfd, 1, -1)) {
        int i, len = recv(pfd.fd, buf, sizeof(buf), MSG_DONTWAIT);
        if (len == -1) die("recv\n");

        // Print the data to stdout.
        i = 0;
        while (i<len) {
            printf("%s\n", buf+i);
            i += strlen(buf+i)+1;
        }
    }
    die("poll\n");

    // Dear gcc: shut up.
    return 0;
  }