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ldd command

Explains: Linux linux-gate.so.1 Library / Dynamic Shared Object [ vdso ]

I'm using the ldd command to get information about /usr/local/nginx/sbin/nginx binary and I see linux-gate.so.1 library. However, I'm unable to find out this file anywhere on the system? What is linux-gate.so.1 and how do I copy this file?
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Explain: Linux and UNIX TCP Wrappers – Find Out If a Program Is Compiled With TCP Wrappers

What are TCP Wrappers? How do I find out if a program or server (service) is compiled with TCP Wrappers? What are the advantages and disadvantages of TCP Wrappers over firewalls like Netfilter or PF? How do I protect my Mac OS X or Sun Solaris or Linux workstation by using TCP Wrappers?
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