system on systemverilog
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system
form the IEEE:
as a function, it returns the return value of the call to system() with data type int. If $system is called with
no string argument, the C function system() will be called with the NULL string.
function system 有返回值,它的返回值就是system fork出来的子进程的结果值。
而linux system进程值的解释如下:
-1 : 子进程fork fail
0 :子进程创建成功
>0: 子进程的返回值
example:
module top;
int id;
initial begin
id =
end
endmodule
此时id=0;
id =
id = 10
所以system的返回值就是子进程的返回值
这在程序中可以用于生成不受seed决定的real random 值
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