inotify example

最新推荐文章于 2024-04-24 09:36:54 发布

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本文介绍了一个使用inotify实现的文件及目录变更监控程序。通过监听指定路径下的创建、删除、修改等事件，程序能够实时反馈文件系统的变动情况，并对新增目录进行递归监控。

#include <stdio.h>
#include <unistd.h>
#include <sys/select.h>
#include <errno.h>
#include <sys/inotify.h>

#include <time.h>
#include <fcntl.h>

static void
_inotify_event_handler(struct inotify_event *event ,int fd)
{

const char* action = NULL;
puts("***************handler event****************************/n");
printf("event->mask: 0x%08x", event->mask);
printf("/t/tevent->name: %s/n", event->name);

if(event->mask & IN_ISDIR)
    {
        if(event->mask & IN_DELETE)
        {
            printf("%s dir delete./n",event->name);
        }
        else if(event->mask & IN_CREATE)
        {
            printf("%s dir create./n",event->name);
            inotify_add_watch(fd, event->name, IN_ALL_EVENTS);
        }
        return ;
    }

switch(event->mask)

    {

        case IN_MODIFY:

        {

            action = "IN_MODIFY";

            break;

        }

        case IN_CREATE:

        {

            action = "IN_CREATE";

            break;

        }

        case IN_DELETE:

        {

            action = "IN_DELETE";

            break;

        }

        case IN_MOVED_FROM:

        {

            action = "IN_MOVED_FROM";

            break;

        }

        case IN_MOVED_TO:

        {

            action = "IN_MOVED_TO";

            break;

        break;

        }

        default:break;

    }

    printf("/nevent->name=%s/t/taction=%s/n",event->name,action);
}

int
main(int argc, char **argv)
{
if (argc != 2) {
    printf("Usage: %s <file/dir>/n", argv[0]);
    return -1;
}

int fd;
int wd;
struct timeval time;
int ret;
time.tv_sec = 10;
time.tv_usec = 0;

unsigned char buf[1024] = {0};
struct inotify_event *event = {0};
   fd = inotify_init();
   wd = inotify_add_watch(fd, argv[1], IN_ALL_EVENTS);

for (;;) {
    fd_set fds;
    FD_ZERO(&fds);
    FD_SET(fd, &fds);
    if ((ret=select(fd + 1, &fds, NULL, NULL, &time)) > 0) {
      int len, index = 0;
      while (((len = read(fd, &buf, sizeof(buf))) < 0) && (errno == EINTR));
      while (index < len) {
        event = (struct inotify_event *)(buf + index);
        _inotify_event_handler(event,fd);
        index += sizeof(struct inotify_event) + event->len;
      }
    }

    else if (!ret)
   { puts("time out/n");}

    else if(ret<0)
    {perror("select ");}

}

inotify_rm_watch(fd, wd);

return 0;
}