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;

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