P is the pointer to the proc structure of the calling process.
p是一个指向调用进程的proc结构的指针。
P is a pointer to the proc structure of the process that makes the socket call.
p是一个指针，指向进行socket调用的进程的proc结构。
If that pointer is a base-class type pointer that points to a derived-type object, then that object is sliced down ( Section 15.3.1, p. 577); only the base-class part is thrown.
如果该指针是一个指向派生类对象的基类类型指针，则那个对象将被分割（ 第15.3.1节），只抛出基类部分。
In such case you don't store a pointer to the Parent class in variable p, but the whole class itself.
在这种情况下，你不要父类的指针存储在变量p，但整个类本身。
In such case you don't store a pointer to the Parent class in variable p, but the whole class itself.
在这种情况下，你不要父类的指针存储在变量p，但整个类本身。
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