Linux系统环境下如何获得U盘拔插的信息

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 

#define UEVENT_BUFFER_SIZE 2048

static int init_hotplug_sock(void);

int main(int argc, char* argv[])
{
int hotplug_sock = init_hotplug_sock();
while(1){
char buf[UEVENT_BUFFER_SIZE*2] = {0};
recv(hotplug_sock, &buf, sizeof(buf), 0); 
printf("%s\n", buf);

}
return 0;
}

static int init_hotplug_sock(void)
{
struct sockaddr_nl snl;
const int buffersize = 16 * 1024 * 1024;
int retval;

memset(&snl, 0x00, sizeof(struct sockaddr_nl));
snl.nl_family = AF_NETLINK;
snl.nl_pid = getpid();
snl.nl_groups = 1;
int hotplug_sock = 

socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);

if (hotplug_sock == -1) {
printf("error getting socket: %s", strerror(errno));
return -1;
}

/* set receive buffersize */
setsockopt(hotplug_sock, 

SOL_SOCKET, SO_RCVBUFFORCE, 

&buffersize, sizeof(buffersize));

retval = bind(hotplug_sock,

 (struct sockaddr *) &snl, 

sizeof(struct sockaddr_nl));

if (retval < 0) {
printf("bind failed: %s", strerror(errno));
close(hotplug_sock);
hotplug_sock = -1;
return -1;
}

return hotplug_sock;
}

[root@new-host ~]# fdisk -l

Disk /dev/sda: 80.0 GB, 80026361856 bytes
255 heads, 63 sectors/track, 9729 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0xcc4acc4a

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1        1275    10241406    7  HPFS/NTFS
/dev/sda2            1276        8418    57376147+   f  W95 Ext'd (LBA)
/dev/sda3            8419        9729    10530607+  83  Linux
/dev/sda5            1276        3825    20482843+   b  W95 FAT32
/dev/sda6            8288        8418     1052226   82  Linux swap / Solaris
/dev/sda7            3826        6120    18434556   83  Linux

Partition table entries are not in disk order

Disk /dev/sdb: 1010 MB, 1010826752 bytes
32 heads, 63 sectors/track, 979 cylinders
Units = cylinders of 2016 * 512 = 1032192 bytes
Disk identifier: 0x91f72d24

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1         980      987808+   b  W95 FAT32