Actually the Single UNIX Specification says:
If the socket is connectionless-mode, the message will be sent to
the address specified by dest_addr. If the socket is
connection-mode, dest_addr is ignored.
And since sendto calls either WSASendTo or winsock 1 sendTo that state:
Even if the connectionless socket has been previously connected
using the connect function to a specific address, lpTo overrides
the destination address for that particular datagram only. On a
connection-oriented socket, the lpTo and iToLen parameters are
ignored; in this case, the WSASendTo is equivalent to WSASend.
Therefore there should be no harm in passing in the NULL value to sendto.
David
Quoting cgf:
I don't see anything in the linux man page or the Single UNIX
Specification which indicates that the "to" address can be NULL.
cgf
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