Mail Archives: cygwin/2002/03/29/19:14:12
On Fri, Mar 29, 2002 at 03:36:23PM -0500, David E Euresti wrote:
>
>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.
I admit that I did miss that part (obviously) but I don't think that it
follows that dest_addr can always be NULL. It looks like the value can
be NULL only if the socket is not connection-less. Otherwise, it should
be checked for validity.
Also, if the argument is ignored then it apparently shouldn't be checked
at all, even to see if the non-NULL address is valid.
cgf
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