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Socket introduction

xx1182 (54)
Well, i'm new to sockets, and i'm using the winsock2 library.
I came across a problem, why i need to tell the lenght of the clientservice variabile?
Here is an exemple:

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bind(m_socket, (SOCKADDR*)&clientService, sizeof(clientService)

/*
I Get m_socket, and the cast, but why do i need to specify the size of my sockaddr_in structure?

namelen [in]
The length, in bytes, of the value pointed to by the name parameter.
*/
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