On Solaris, this sample code allows you to get the stack pointer.

在Solaris，下面这段示例代码让您可以获取堆栈指针。

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The calling function must not care where the stack pointer is currently pointing.

调用的函数一定不能顾虑栈指针当前所指的位置。

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This makes it easy for functions to know where their activation record is — they are simply defined in terms of the stack pointer.

这对函数了解自己的活动记录在什么地方提供了方便——它们可以使用堆栈指针的形式简单地进行定义。

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