套接字标识符是本地分配的，即每个进程有各自的套接字标识符空间。标识符仅具有一种类似索引号码的作用，系统根据进程给出的标识符，查进程资源表，找到相应的套接口结构，从而向进程提供通信服务，真正的通信服务是挂接在套接口结构上的。不同的进程就算有相同的套接字标识符，也不能使用到相同的通信服务。-socket identifier is a local distribution that each process has its own socket identifier space. Identifier only have a similar role Index numbers, the system is under the process identifier, and examine the process of resource tables, find the corresponding sets of interface structure, so as to provide communications services process, the real communications services is articulated in the presentation on the structure of the interface. Even if the process is the same socket identifier, nor to use the same communications services.