Here's an Eclipse tip: Select errno in your code, then press the F3 key (or right-click on errno, then choose Open Declaration from the context menu).
以下是Eclipse的使用技巧：在代码中选择errno，然后按下f3键(或右键单击errno，然后从上下文菜单中选择“OpenDeclaration”)。
In Linux, the same semget call is used to open the semaphore with 0 as the value for the semflg: int semget (key, nsems, 0). In this code.
在Linux中，可以调用相同的semget来打开某个信号量，不过此时semflg的值为0：int semget (key,nsems, 0)。
Input the established Code, then presses "b" key, the green light will flash for 5 seconds, during the flashing, turn the handwheel clockwise to open the Safe.
输入所设定的密码，然后按下“B”键，绿灯亮5秒，在绿灯亮时，顺时针转动手轮打开箱门。
Input the established Code, then presses "b" key, the green light will flash for 5 seconds, during the flashing, turn the handwheel clockwise to open the Safe.
输入所设定的密码，然后按下“B”键，绿灯亮5秒，在绿灯亮时，顺时针转动手轮打开箱门。
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