socket options

[Shiraz Baig <shiraz_baig yahoo com>]

I am trying to set socket options
   
   struct ip_mreq mreq;
   setsockopt(socket, IPPROTO_IP, IP_ADD_MEMBERSHIP,
                &mreq, sizeof(mreq));

If I make this call, before creating widgets etc, it
works fine. But when I have created widgets and I make
this call, through a callback of a button_click, it
does not succeed. 
It gives an error message "invalid arguments". 

Can anyone throw some light on it?
Thanks

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