inotify监听文件

Posted 2020-11-23 porkerface

 

inotify监听文件并通知

static int inotify_dbfile(const char *spFromRule, const char *spDevFile)
{
    int inotifyFd;
    int watchfd1;
    int watchfd2;
    char buf[BUF_LEN];
    size_t numRead;
    char *spfile;
    struct inotify_event *event;
    int ret = 0;

    /* 初始化inotify实例 */
    if (-1 == (inotifyFd = inotify_init ()))
    {
        LOG_ERROR("Error: Inotify Initialization is failed..");
        exit(1);
    }
    
    /* 循环所有输入目录，设置监视 */
    if (-1 == (watchfd1 = inotify_add_watch (inotifyFd, spFromRule, event_mask)))
    {
        LOG_ERROR("Error: Inotify Watch [%s] is failed..", spFromRule);
        exit(2);
    }
    
    if (-1 == (watchfd2 = inotify_add_watch (inotifyFd, spDevFile, event_mask)))
    {
        LOG_ERROR("Error: Inotify Watch [%s] is failed..", spDevFile);
        exit(2);
    }
    
    while (1)
    {  
        /* Read events forever */
        if (1 > (numRead = read(inotifyFd, buf, BUF_LEN)))
        {
            LOG_ERROR("read() from inotify fd returned 0!");
            puts("read() from inotify fd returned 0!");
            exit(4);
        }

        /* 处理read（）返回的缓冲区中的所有事件 */
        for (spfile = buf; spfile < buf + numRead; ) 
        {
            event = (struct inotify_event *) spfile;
            if ((event->mask & IN_MODIFY))
            {
                LOG_INFO("INFO: Inotify Watch file is modified...");
                ret = 1;
                goto end;
            }

            spfile += sizeof(struct inotify_event) + event->len;
        }
    }

end:
    inotify_rm_watch(inotifyFd, watchfd1);
    inotify_rm_watch(inotifyFd, watchfd2);
    close(inotifyFd);
    
    return ret;
}