USB dongle detection

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <sys/un.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <linux/types.h>
#include <linux/netlink.h>
#include <errno.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <netinet/in.h>

#define UEVENT_BUFFER_SIZE 2048

static int init_hotplug_sock()
{
const int buffersize = 1024;
int ret;

struct sockaddr_nl snl;
bzero(&snl, sizeof(struct sockaddr_nl));
snl.nl_family = AF_NETLINK;
snl.nl_pid = getpid();
snl.nl_groups = 1;

int s = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
if (s == -1)
{
perror("socket");
return -1;
}
setsockopt(s, SOL_SOCKET, SO_RCVBUF, &buffersize, sizeof(buffersize));

ret = bind(s, (struct sockaddr *)&snl, sizeof(struct sockaddr_nl));
if (ret < 0)
{
perror("bind");
close(s);
return -1;
}

return s;
}

int main(int argc, char* argv[])
{
int hotplug_sock = init_hotplug_sock();

while(1)
{
/* Netlink message buffer */
char buf[UEVENT_BUFFER_SIZE * 2] = {0};
recv(hotplug_sock, &buf, sizeof(buf), 0);
printf("%s\n", buf);

}
return 0;
}

Insert USB dongle into USB socket

add@/devices/pci0000:00/0000:00:1d.7/usb1/1-6
add@/devices/pci0000:00/0000:00:1d.7/usb1/1-6/1-6:1.0
add@/devices/pci0000:00/0000:00:1d.7/usb1/1-6/1-6:1.0/host8
add@/devices/pci0000:00/0000:00:1d.7/usb1/1-6/1-6:1.0/host8/scsi_host/host8
add@/devices/pci0000:00/0000:00:1d.7/usb1/1-6/1-6:1.0/usb_endpoint/usbdev1.11_ep01
add@/devices/pci0000:00/0000:00:1d.7/usb1/1-6/1-6:1.0/usb_endpoint/usbdev1.11_ep82
add@/devices/pci0000:00/0000:00:1d.7/usb1/1-6/1-6:1.0/usb_endpoint/usbdev1.11_ep83
add@/devices/pci0000:00/0000:00:1d.7/usb1/1-6/usb_endpoint/usbdev1.11_ep00
add@/devices/pci0000:00/0000:00:1d.7/usb1/1-6/1-6:1.0/host8/target8:0:0
add@/devices/pci0000:00/0000:00:1d.7/usb1/1-6/1-6:1.0/host8/target8:0:0/8:0:0:0
add@/devices/pci0000:00/0000:00:1d.7/usb1/1-6/1-6:1.0/host8/target8:0:0/8:0:0:0/scsi_disk/8:0:0:0
change@/devices/pci0000:00/0000:00:1d.7/usb1/1-6/1-6:1.0/host8/target8:0:0/8:0:0:0
add@/devices/pci0000:00/0000:00:1d.7/usb1/1-6/1-6:1.0/host8/target8:0:0/8:0:0:0/block/sdb
add@/devices/pci0000:00/0000:00:1d.7/usb1/1-6/1-6:1.0/host8/target8:0:0/8:0:0:0/block/sdb/sdb1
add@/devices/virtual/bdi/8:16
add@/devices/pci0000:00/0000:00:1d.7/usb1/1-6/1-6:1.0/host8/target8:0:0/8:0:0:0/scsi_device/8:0:0:0
add@/devices/pci0000:00/0000:00:1d.7/usb1/1-6/1-6:1.0/host8/target8:0:0/8:0:0:0/scsi_generic/sg2

Remove USB dongle from USB socket

remove@/devices/pci0000:00/0000:00:1d.7/usb1/1-6/1-6:1.0/usb_endpoint/usbdev1.11_ep01
remove@/devices/pci0000:00/0000:00:1d.7/usb1/1-6/1-6:1.0/usb_endpoint/usbdev1.11_ep82
remove@/devices/pci0000:00/0000:00:1d.7/usb1/1-6/1-6:1.0/usb_endpoint/usbdev1.11_ep83
remove@/devices/pci0000:00/0000:00:1d.7/usb1/1-6/1-6:1.0/host8/target8:0:0/8:0:0:0/scsi_generic/sg2
remove@/devices/pci0000:00/0000:00:1d.7/usb1/1-6/1-6:1.0/host8/target8:0:0/8:0:0:0/scsi_device/8:0:0:0
remove@/devices/pci0000:00/0000:00:1d.7/usb1/1-6/1-6:1.0/host8/target8:0:0/8:0:0:0/scsi_disk/8:0:0:0
remove@/devices/pci0000:00/0000:00:1d.7/usb1/1-6/1-6:1.0/host8/target8:0:0/8:0:0:0/block/sdb/sdb1
remove@/devices/virtual/bdi/8:16
remove@/devices/pci0000:00/0000:00:1d.7/usb1/1-6/1-6:1.0/host8/target8:0:0/8:0:0:0/block/sdb
remove@/devices/pci0000:00/0000:00:1d.7/usb1/1-6/1-6:1.0/host8/target8:0:0/8:0:0:0
remove@/devices/pci0000:00/0000:00:1d.7/usb1/1-6/1-6:1.0/host8/scsi_host/host8
remove@/devices/pci0000:00/0000:00:1d.7/usb1/1-6/1-6:1.0/host8
remove@/devices/pci0000:00/0000:00:1d.7/usb1/1-6/1-6:1.0
remove@/devices/pci0000:00/0000:00:1d.7/usb1/1-6/usb_endpoint/usbdev1.11_ep00
remove@/devices/pci0000:00/0000:00:1d.7/usb1/1-6
remove@/host8/target8:0:0