getsockname problem

[Reid Thompson]

Antonio Querubin wrote:
> 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;
>
> }
well,,, not 'any' other linux system...

$ ./getsockname
socket = -1
length = 16
getsockname rc = -1
returned length = 16
getsockname: Bad file descriptor

[rthompso@wasteland /home/rthompso
$ uname -a
Linux wasteland 2.4.18-18.7.x #1 Wed Nov 13 20:29:30 EST 2002 i686 unknown

similar failed response on WinXP
$ ./getsockname
socket = 3
length = 16
getsockname rc = -1
returned length = 16
getsockname: Invalid argument
WS-XP-4960[08:38:46]: /home/rthompso>


perhaps a re-coding is in order...




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