FD 4 is where things get a bit more interesting, since it is a write-only handle to a character device, essentially /dev/log.
FD4 中的内容比较有趣，因为它是一个字符设备的只读句柄，实质上是 /dev/log。
The only Write operation permitted on a flash memory device is to change a bit from a one to a zero.
flash内存设备中惟一允许的Write操作是将1修改为0。
The only Write operation permitted on a flash memory device is to change a bit from a one to a zero.
flash内存设备中惟一允许的Write操作是将1修改为0。
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