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RE: getsockname problem


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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