Linux C程序， 用于同步rtc读取得时间和kernel的时间， 因为有时由于硬件的影响，这两个时间会产生差异。 程序相当于hwclock, 可用于嵌入式设备上。-Linux C program, is used to syncronize the time bwtween RTC and kernel time, since sometimes the two time differs because of hardware problem on embedded equipment.