newbie - where is the socket API implementation in glibc

[sting sting]

Hello,

I had downloaded the tar.gz of glibc;
I am interested in the learning the implementation of  the socket API in 
glibc
(calls like socket,bind,gethostbyname,etc.).
I saw in the inet subdirectory on glibc that it seems that  these calls
are eventually result in calls to methods in nss subdirectory.
BUt I am not sure.
Am I right in my assumption?
or where I can find the implementation of methods like bind(), connect(), 
socket(), etc.

regards
sting

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