getsockname problem

[Antonio Querubin]

I've run into a problem where getsockname() doesn't work as expected. 
Below is a test program where it fails under cygwin but runs on any other 
Unix/Linux system.  I searched the mail archives for any limitations

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>

int main() {

   struct sockaddr_in sa;
   socklen_t len = sizeof sa;
   int s, rc;

   s = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
   printf("socket = %d\nlength = %d\n", s, len);

   rc = getsockname(s, (struct sockaddr *) &sa, &len);
   printf("getsockname rc = %d\nreturned length = %d\n", rc, len);
   perror("getsockname");

   return rc;

}

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