MySQL:如何编写daemon plugin(14)

                       usage.ru_msgsnd, 

                       usage.ru_msgrcv, 

                       usage.ru_nsignals, 

                       usage.ru_nvcsw, 

                       usage.ru_nivcsw); 

            /*写入monitoring_file文件*/ 

            write(monitoring_file, buffer,strlen(buffer)); 

        } 

    } 

} 

/*系统启动或加载插件时时调用该函数，用于创建后台线程*/ 

static int monitoring_plugin_init(void*p) 

{ 

    pthread_attr_t attr; 

    char monitoring_filename[FN_REFLEN]; 

    char buffer[MONITORING_BUFFER]; 

    char time_str[20]; 

     monitor_num = 0; 

    /*format the filename

     *The fn_format() function is designed tobuild a filename and path compatible

     with the current operating system given aset of parameters. More details on its

     functionality can be found inmysys/mf_format.c.

     * */ 

    fn_format(monitoring_filename,"monitor", "", ".log", 

            MY_REPLACE_EXT |MY_UNPACK_FILENAME); 

    unlink(monitoring_filename); 

    monitoring_file = open(monitoring_filename, 

            O_CREAT | O_RDWR, 0644); 

    if (monitoring_file < 0) 

    { 

        fprintf(stderr, "Plugin'monitoring': " 

                "Could not create file '%s'\n", 

                monitoring_filename);