监视热插拔事件

#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>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;}#define UEVENT_BUFFER_SIZE   2048int 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;}