linux环境下运用汇编语言实现端口监听，并运用objdump工具抽取机器码，再shellcode一下，实现另一种方式监听 -linux environment, the use of assembly language port monitor, and use objdump tool to extract the machine code, then look shellcode, another way to monitor implementation

讲解C语言的实现,深入到汇编级别,描述C运行时环境等内容,适于高级程序员阅读。(Explain the implementation of C language, go to assembly level, describe C runtime environment and so on, which is suitable for senior programmers to read.)