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Date: Fri, 29 Mar 2002 19:16:52 -0500
From: Christopher Faylor <cgf AT redhat DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: sendto bug
Message-ID: <20020330001652.GB4668@redhat.com>
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References: <Pine DOT GSO DOT 4 DOT 30L DOT 0203291509340 DOT 24339-100000 AT magic-pi-ball DOT mit DOT edu> <20020330001329 DOT GA7168 AT redhat DOT com>
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On Fri, Mar 29, 2002 at 07:13:29PM -0500, Christopher Faylor wrote:
>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
                              \/
                              is  
>be checked for validity.

cgf

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