Ok, I have a possible reason why this may be failing.<div><br></div><div>In l1-sockets.lisp, line 1436 (from trunk several months ago, so exactly line number may have changed) says:</div><div><br></div><div> (do* ((reservedlen (* 4 (record-length #>INTERFACE_INFO))</div>
<div> (* 2 reservedlen)))</div><div><br></div><div>I always thought this would increase the size of the buffer until it was large enough to fit the data. But in ip-interfaces, when I tested a larger initial value, it suddenly started working. (And it's returning 6 interfaces, so it's understandable how it might not have been able to fit those in my initial memory size.)</div>
<div><br></div><div>I don't have all the stuff set up to build ccl from source, but would someone (i.e. a ccl developer) like to try this out?<br><br><div class="gmail_quote">On Mon, Jul 19, 2010 at 9:11 PM, Elliott Slaughter <span dir="ltr"><<a href="mailto:elliottslaughter@gmail.com">elliottslaughter@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">I don't know how I can possibly not have an active interface when I am using my computer to write this email ;-)<div>
<br></div><div>If you'd like me to do any testing, I'd be happy to. I've tried both ccl 1.4 and 1.5 and both still return nil for me.<div><div></div><div class="h5"><br>
<br><div class="gmail_quote">On Mon, Jul 19, 2010 at 1:07 AM, Gary Byers <span dir="ltr"><<a href="mailto:gb@clozure.com" target="_blank">gb@clozure.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
We used to use an address returned by %GET-IP-INTERFACES as part of random-state<br>
initialization, and my recollection is that that would sometimes fail on Windows<br>
because %GET-IP-INTERFACES sometimes returned NIL. Unless something's really<br>
badly misconfigured on a Unix box, at least the loopback interface (127.0.0.1)<br>
would always be there, and you'd generally see other interfaces known to the OS<br>
regardless of whether they were up or down and regardless of whether or not they<br>
had had IP(V4) addresses assigned to them or not; you'd pretty much see what<br>
"ifconfig -a" would show you (and it was likely that the ifconfig program and<br>
%GET-IP-INTERFACES were using the same mechanism to enumerate network interfaces.)<br>
<br>
On a Win7 box running the CCL trunk - where the ethernet interface is active and<br>
a WiFi interface is disabled - %GET-IP-INTERFACES returns a list describing the<br>
loopback and ethernet interfaces. I'm ssh'ed into that box and can't conveniently<br>
try, but I'm fairly sure that if I disabled the ethernet interface it'd return<br>
an empty list (the loopback interface might only be visible if some non-loopback<br>
interface is active in some sense.) Many laptop WiFi cards will go to sleep (to<br>
save power) if they haven't seen traffic for a while, and that might also cause<br>
%GET-IP-INTERFACES to return NIL.<br>
<br>
If this is true ... well, what %G-I-I does on Windows isn't quite what it does<br>
on Unix systems (it's more like "%GET-ACTIVE-INTERFACES", for a possibly strict<br>
definition of "active.") There's likely some way of enumerating all interfaces<br>
on Windows (things like network control panels need some way of doing that), but<br>
there may or may not be a public, supported way. I don't know.<br>
<br>
I also don't know how much I trust my theory about WiFi interfaces<br>
turning themselves on and off - the SIO_GET_INTERFACE_LIST ioctl is supposed to<br>
return a list of "configured" interfaces, and I don't know whether a power-saving<br>
mode would involve loss of configuration.<br>
<br>
(All of this is a long way of saying "I don't know"; I'm pretty confident in<br>
saying that the CCL code for %GET-IP-INTERFACES hasn't changed in at least a year<br>
or two and that what it returns on Windows depends on what interfaces are "active",<br>
though I don't know precisely how "active" is defined.)<div><div></div><div><br>
<br>
<br>
On Sun, 18 Jul 2010, Elliott Slaughter wrote:<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi,<br>
<br>
I have kind of a bizarre problem. I noticed recently that ccl::%get-ip-interfaces returns nil for me, but just 3 or 4 months<br>
ago I used to get a list of my network connections. I am running Windows 7 Pro 64-bit, and have not upgraded or changed my CCL<br>
installation in any way during that time frame. My CCL version is 1.4-r13122. The only thing I can think of that might changed<br>
on my system are security updates from Microsoft. I have tried changing network settings, and disabling the firewall, and<br>
nothing seems to help.<br>
<br>
The reason I ask is because several months ago I ported ccl::%get-ip-interfaces to CFFI. At the time, that implementation<br>
worked perfectly on 5 different CL implementations. Now it returns nil in all of them in Windows. I have not made any changes<br>
to the ip-interfaces code during that time. Everything still works fine on other operating systems.<br>
<br>
Any ideas would be appreciated. Thanks.<br>
<br>
--<br>
Elliott Slaughter<br>
<br>
"Don't worry about what anybody else is going to do. The best way to predict the future is to invent it." - Alan Kay<br>
<br>
</blockquote>
</div></div></blockquote></div><br><br clear="all"><br></div></div>-- <br><div class="im">Elliott Slaughter<br><br>"Don't worry about what anybody else is going to do. The best way to predict the future is to invent it." - Alan Kay<br>
</div></div>
</blockquote></div><br><br clear="all"><br>-- <br>Elliott Slaughter<br><br>"Don't worry about what anybody else is going to do. The best way to predict the future is to invent it." - Alan Kay<br>
</div>