UDP socket , client side

In UDP communication when I send a packet from client I execute the socket() system call but I didn't understand if It's necessary to follow the bind()one too.

client side

Case A:

socket(...)
bind(...)
sendto(...)


Case B:
socket(...)
sendto(...)

It's right A or B or both cases ?
Peraphs if I omit bind() the O.S. automatically executes It ?


Bind links socket to ip address+port, so according my opinion this task should be execute from each client too, because clients in TCP/UDP communication use IP+port. What do you think ?

Thanks

AFAIK, bind() is used on the server side, not on the client one, For the client there are the following steps to create a socket and communicate: Winsock Client Application

Quote:

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Originally Posted by VictorN

AFAIK, bind() is used on the server side, not on the client one, For the client there are the following steps to create a socket and communicate

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Perhaps on client side, O.S. associates IP+Port to socket because client socket end has to get IP with an ephemeral port to send data by nuetwork, if you use bind() you will specify exactly these data (if you have multiple interface or specific port over 1024) which will bring forward from O.S.