Hello! On Monday 06 February 2006 12:46, Andreas Gaupmann wrote: > What is the explanation for msg->msg_name not being initialized all the > time? Is this field filled after the discussed hook function has already > been called? > How can the destination socket of the message be determined despite > msg->msg_name equal to NULL? > OK, I have found the answer. Destination socket addresses for datagram sockets can be specified in two ways: 1) Use a msghdr structure and set the msg_name member. 2) Make a call to connect() with a defined socket address and set msg_name to NULL. Subsequent calls to sock_sendmsg will use this address as destination. In case 1 the hook function socket_sendmsg() will be called with an initialized msg_name. Case 2 explains why the msg_name field can be NULL. In case 2 the hook funtion socket_connect() must be used. That's probably all that is to it. Regards Andreas Gaupmann
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