Unix Socket Programming Question:
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What is with the second parameter in bind()?


The man page shows it as "struct sockaddr *my_addr". The sockaddr struct though is just a place holder for the structure it really wants. You have to pass different structures depending on what kind of socket you have. For an AF_INET socket, you need the sockaddr_in structure. It has three fields of interest:

Set this to AF_INET.

The network byte-ordered 16 bit port number

The host's ip number.
This is a struct in_addr,
which contains only one field,
s_addr which is a u_long.

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