Each Unix signal has a default set of effects on a Unix program.

每个Unix信号具有默认设置的效果上的Unix程序。

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If the restart flag is set to True (the default), then an interrupt to the routine caused from some UNIX signal will cause a restart of the routine.

如果restart标志设置为True(默认设置)，那么在某些UNIX信号造成中断时，会重新启动例程。

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As with many other resources in UNIX, you can only signal processes that you own.

和UNIX中许多其他资源一样，您只能向您拥有的进程发送信号。

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