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。关于这个话题，PDF资料提供了深入分析
create_server(port: 3000); // just change port，这一点在新收录的资料中也有详细论述
[#]. Repeat last normal command # times
The latter is the more interesting test — it writes a 0xcc byte (the x86-64 software breakpoint instruction) which will cause the kernel to deliver a SIGTRAP to our process if executed. This is literally changing the executable code of libc. So the next time we call getchar, if we get a SIGTRAP, we know that the write has succeeded.