If the client process has not explicitly issued a bind system call before initiating the connection, implicit binding on the local socket is taken care of by the stack.
如果在初始化连接之前，客户端进程没有显式发布bind系统调用，则堆栈负责本地套接字上的隐式绑定。
The kernel takes care of doing an implicit binding when the client process issues the connect system call.
当客户端进程发布 connect 系统调用时，内核负责执行隐式绑定。
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