Each chunk is a direct index to the pointer array of the corresponding level: the first left-hand-side chunk to the first-level nodes, the second chunk to the nodes of the second level, and so on.
每个小块便是相应层的指针数组的直接索引：最左边的小块指向第一层节点，第二个小块指向第二层的节点，依此类推。
The call to execv first takes a pointer to the name of the binary to be run, and then a pointer to the array of parameters that you declared earlier.
execv 调用首先取得一个指向要运行的二进制文件名称的指针，然后取得一个指向您前面声明的参数数组的指针。
You can think of userdata as an array of bytes — bytes that might represent a pointer, a structure, or a file in the host application.
我们可以认为userdata就是一个字节数组——字节可以表示指针、结构或宿主应用程序中的文件。
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