inotify使用代码

#include <stdio.h>
#include <sys/epoll.h>
#include <stdlib.h>
#include <sys/inotify.h>

#define FDMAXNUM (1024)
#define MAXEVENTS (64)
#define FAILURE_EXIT (-1)
#define INOTIFYEVENTBUFSIZE (1024)

int main(int argc, char**argv){

    int ifd = inotify_init();
    if(ifd==-1){
	perror("inotify_init failed");
	exit(FAILURE_EXIT);
    }
    char ibuf[INOTIFYEVENTBUFSIZE] __attribute__((aligned(4))) = {0} ;

    int efd=epoll_create(FDMAXNUM);
    if(efd==-1){
	perror("epoll_createfailed");
	exit(FAILURE_EXIT);
    }
    
    int ret = -1;
    struct epoll_event event;
    event.data.fd = ifd;
    event.events = EPOLLIN; 

    ret = epoll_ctl(efd, EPOLL_CTL_ADD, ifd, &event);
    if(ret==-1) {
	perror("epoll_ctl failed");
	exit(FAILURE_EXIT);
    }

    int wd = inotify_add_watch(ifd, "/home/yaozh/Videos",IN_ACCESS);
    if (wd==-1) {
	perror("inotify_add_watch failed");
	exit(FAILURE_EXIT);
    }

    //wait for change event to come
    int eventnum = -1;
    struct epoll_event *events = malloc(sizeof(struct epoll_event) * MAXEVENTS);
    do {
	eventnum = epoll_wait(efd, events, MAXEVENTS, -1);
	if (eventnum==-1){
	    perror("epoll_wait failed");
	    free(events);
	    exit(FAILURE_EXIT);
	}
	int len = 0;
	len = read(ifd, ibuf,INOTIFYEVENTBUFSIZE);
	while (len) {
	    int i=0;
	    while(i<len) {
		struct inotify_event *event = (struct inotify_event*)(ibuf+i);
		if(event->len) {
		    printf("name is %s\n", event->name);
		}
		i += sizeof(struct inotify_event) + event->len;
	    }
	    len = read(ifd, ibuf, INOTIFYEVENTBUFSIZE);
	}
    } while (eventnum);
	
    free(events);

    ret = close(efd);
    if(ret==-1) {
	perror("close epoll fd failed");
	exit(FAILURE_EXIT);
    }
    ret = close(ifd);
    if(ret==-1) {
	perror("close inotify fd failed");
	exit(FAILURE_EXIT);
    }

    return 0;
}