使用inotify获取usb设备插拔事件，请用C语言写出程序

以下是使用inotify获取USB设备插拔事件的C语言程序：

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/inotify.h>

#define EVENT_SIZE  (sizeof (struct inotify_event))
#define BUF_LEN     (1024 * (EVENT_SIZE + 16))

int main(int argc, char **argv)
{
    int fd, wd;
    char buf[BUF_LEN];
    int len, i = 0;
    char *p;
    struct inotify_event *event;

    fd = inotify_init();
    if (fd < 0) {
        perror("inotify_init");
        return -1;
    }

    wd = inotify_add_watch(fd, "/dev/", IN_CREATE | IN_DELETE);
    if (wd < 0) {
        perror("inotify_add_watch");
        return -1;
    }

    while (1) {
        len = read(fd, buf, BUF_LEN);
        if (len < 0) {
            perror("read");
            return -1;
        }

        i = 0;
        while (i < len) {
            event = (struct inotify_event *) &buf[i];
            if (event->mask & IN_CREATE) {
                if (event->mask & IN_ISDIR) {
                    printf("The directory %s was created.\n", event->name);
                } else {
                    printf("The file %s was created.\n", event->name);
                }
            } else if (event->mask & IN_DELETE) {
                if (event->mask & IN_ISDIR) {
                    printf("The directory %s was deleted.\n", event->name);
                } else {
                    printf("The file %s was deleted.\n", event->name);
                }
            }
            i += EVENT_SIZE + event->len;
        }
    }

    inotify_rm_watch(fd, wd);
    close(fd);

    return 0;
}

该程序使用inotify机制监听/dev/目录下的IN_CREATE和IN_DELETE事件，当有USB设备插入或拔出时，会打印相应的消息。注意，该程序需要使用root权限运行。