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Date: Fri, 7 Apr 2006 17:56:53 -1000 (HST)
From: Antonio Querubin <tony AT lava DOT net>
To: Dave Korn <dave DOT korn AT artimi DOT com>
Cc: cygwin AT cygwin DOT com
Subject: RE: getsockname problem
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On Fri, 7 Apr 2006, Dave Korn wrote:

>  Should have read the man page instead!
>
>>    s = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
>>    printf("socket = %d\nlength = %d\n", s, len);
>>
>>    rc = getsockname(s, (struct sockaddr *) &sa, &len);
>
>
> http://www.opengroup.org/onlinepubs/007908799/xns/getsockname.html
>
> "If the socket has not been bound to a local name, the value stored in the
> object pointed to by address is unspecified."

This doesn't explain why the code fragment works under UNIX and Linux 
systems (that I have access to), but fails under Cygwin.

According to Steven's 'Unix Network Programming', 2'd edition, Vol 1, 
"Posix.1g allows a call to getsockname() on an unbound socket". 
Furthermore, the Cygwin API indicates Cygwin's networking support is 
standardized to Posix.1g for getsockname() and a whole bunch of the other 
networking functions.

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