arg1
arg1-
Arg1 is the return value from the function being probed for return probe .
arg1是要探测的函数的返回值，用于退出探测。
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When used within a DTrace script during monitoring , each argument is available within variables named arg0 , arg1 , etc.
在监视期间，DTrace脚本可以通过变量arg0、arg1等访问每个参数。
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So in the case of the primecalc__done probe , the prime number would be arg0 and whether the number is a prime would be arg1 .
因此，对于primecalcdone探测，素数是arg0，不确定是否是素数则用arg1表示。