How to completely destroy a socket connection in C

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The close call only marks the TCP socket closed. It is not usable by process anymore.
But kernel may still hold some resources for a period (TIME_WAIT, 2MLS etc stuff).

Setting of SO_REUSEADDR should remove binding problems.

So be sure that value of true is really non-zero when calling setsockopt (overflow bug may overwrite it): 

true = 1;
setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,&true,sizeof(int))

There is pid variable is your code. If you use fork (for starting connection handling processs), then you should close sock also in the process which does not need it.

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