阻塞和未阻塞信号收到 BLR BLocking Reception
棒阻塞信号 rod block signal
阻塞信号大小 Jam Size
阻塞和未阻塞信号发出 BLS BLocking Sending
阻塞确认信号 blocking acknowledgement signal
链路阻塞确认信号 link inhibit acknowledgement signal
强信号阻塞 strong signal blocking
不过，如果程序不使用gethostbyname或者任何其他在同一对象中返回信息的函数，或者如果它每次使用时都会阻塞信号，那么就是安全的。
However, if the program does not use gethostbyname or any other function that returns information in the same object, or if it always blocks signals around each use, you're safe.
有一个特殊的信号 SIGKILL 是无法被阻塞或捕捉的，它会立即终止某个进程。
One special signal, SIGKILL, can't be blocked or caught, and it kills a process immediately.
GPS信号相对较弱，也易于阻塞。
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