linux netLink检测usb插拔事件

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

  
int main(void)  
{  
    struct sockaddr_nl client;  
    struct timeval tv;  
    int CppLive, rcvlen, ret;  
    fd_set fds;  
    int buffersize = 1024;  
    CppLive = socket(AF_NETLINK, SOCK_RAW, NETLINK_KOBJECT_UEVENT);  
    memset(&client, 0, sizeof(client));  
    client.nl_family = AF_NETLINK;  
    client.nl_pid = getpid();  
    client.nl_groups = 1; /* receive broadcast message*/  
    setsockopt(CppLive, SOL_SOCKET, SO_RCVBUF, &buffersize, sizeof(buffersize));  
    bind(CppLive, (struct sockaddr*)&client, sizeof(client));  
    while (1) {  
        char buf[UEVENT_BUFFER_SIZE] = { 0 };  
        FD_ZERO(&fds);  
        FD_SET(CppLive, &fds);  
        tv.tv_sec = 0;  
        tv.tv_usec = 100 * 1000;  
        ret = select(CppLive + 1, &fds, NULL, NULL, &tv);  
        if(ret < 0)  
            continue;  
        if(!(ret > 0 && FD_ISSET(CppLive, &fds)))  
            continue;  
        /* receive data */  
        rcvlen = recv(CppLive, &buf, sizeof(buf), 0);  
        if (rcvlen > 0) {  
            printf("%s\n", buf);  
            /*You can do something here to make the program more perfect!!!*/  
        }  
    }  
    close(CppLive);  
    return 0;  
}